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02 - Core Java/060 Dynamic Method Dispatch.mp4

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12 - Spring Boot Web/009 Source-Code.url

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+URL=https://github.com/navinreddy20/spring6-course/tree/f1161e151ea06b68810b3cae03005d4955a96a8b/6%20Spring%20%20Boot%20Web/5.9%20Creating%20a%20Controller

12 - Spring Boot Web/010 RequestMapping_en.srt

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+1
+00:00:00,000 --> 00:00:03,000
+(bright music)
+
+2
+00:00:03,000 --> 00:00:06,000
+-: Okay, so let's solve this problem of mapping.
+
+3
+00:00:06,000 --> 00:00:08,000
+The thing is, if you want to map this, you don't have
+
+4
+00:00:08,000 --> 00:00:11,000
+to do any qualification for the XML, luckily.
+
+5
+00:00:11,000 --> 00:00:12,000
+We have to use annotation.
+
+6
+00:00:12,000 --> 00:00:14,000
+Now, which annotation we have to use?
+
+7
+00:00:14,000 --> 00:00:16,000
+So for this, for mapping the request,
+
+8
+00:00:16,000 --> 00:00:19,000
+we have to use annotation call RequestMapping.
+
+9
+00:00:19,000 --> 00:00:23,000
+And in this mapping you have to pass the path.
+
+10
+00:00:23,000 --> 00:00:24,000
+The path here is homepage.
+
+11
+00:00:24,000 --> 00:00:26,000
+So whenever someone calls the homepage,
+
+12
+00:00:26,000 --> 00:00:28,000
+this is something I want to execute.
+
+13
+00:00:28,000 --> 00:00:30,000
+It is as simple as that.
+
+14
+00:00:30,000 --> 00:00:32,000
+Just a request mapping, it will come to know
+
+15
+00:00:32,000 --> 00:00:34,000
+that this is a mapping we have to do,
+
+16
+00:00:34,000 --> 00:00:35,000
+which is for the slash.
+
+17
+00:00:35,000 --> 00:00:36,000
+Yeah, if you're doing for the students,
+
+18
+00:00:36,000 --> 00:00:37,000
+you can also say student.
+
+19
+00:00:37,000 --> 00:00:39,000
+So you can say slash student,
+
+20
+00:00:39,000 --> 00:00:40,000
+you will map for slash student,
+
+21
+00:00:40,000 --> 00:00:44,000
+but at this point I want to map it for the slash homepage.
+
+22
+00:00:44,000 --> 00:00:46,000
+And that's the only change you have to make.
+
+23
+00:00:46,000 --> 00:00:50,000
+Let's refresh this taking some time, go back to your browser
+
+24
+00:00:50,000 --> 00:00:52,000
+and say, refresh, done.
+
+25
+00:00:52,000 --> 00:00:54,000
+Something happened.
+
+26
+00:00:54,000 --> 00:00:56,000
+Okay, it's not the same thing which we were expecting.
+
+27
+00:00:56,000 --> 00:00:59,000
+We were expecting a page.
+
+28
+00:00:59,000 --> 00:01:00,000
+But you can see it says,
+
+29
+00:01:00,000 --> 00:01:04,000
+do you want to allow downloads on local host?
+
+30
+00:01:04,000 --> 00:01:07,000
+If I say allow, something got downloaded.
+
+31
+00:01:07,000 --> 00:01:10,000
+If I see here it says unknown file. I mean that's weird.
+
+32
+00:01:10,000 --> 00:01:13,000
+I was expecting a output on the page,
+
+33
+00:01:13,000 --> 00:01:16,000
+but it is giving me a download.
+
+34
+00:01:16,000 --> 00:01:18,000
+But if you really think about this download,
+
+35
+00:01:18,000 --> 00:01:22,000
+this is actually a file which has your JSP content.
+
+36
+00:01:22,000 --> 00:01:26,000
+So if you see this is the page which we are getting,
+
+37
+00:01:26,000 --> 00:01:29,000
+I don't want page, I want output, what's happening here?
+
+38
+00:01:29,000 --> 00:01:31,000
+So we'll talk about what is happening in some time.
+
+39
+00:01:31,000 --> 00:01:33,000
+It is not working the way we wanted,
+
+40
+00:01:33,000 --> 00:01:38,000
+but at least we are able to call this home.
+
+41
+00:01:38,000 --> 00:01:41,000
+This is working, right? So we have reached to this point
+
+42
+00:01:41,000 --> 00:01:43,000
+where we are able to call a particular method,
+
+43
+00:01:43,000 --> 00:01:45,000
+depend upon the mapping.
+
+44
+00:01:45,000 --> 00:01:47,000
+And request mapping is not the only method we have.
+
+45
+00:01:47,000 --> 00:01:48,000
+So apart from RequestMapping,
+
+46
+00:01:48,000 --> 00:01:50,000
+we also have GetMapping, PostMapping.
+
+47
+00:01:50,000 --> 00:01:52,000
+We'll see that later.
+
+48
+00:01:52,000 --> 00:01:54,000
+So if I say, I'll show you just a method name,
+
+49
+00:01:54,000 --> 00:01:57,000
+like we got GetMapping, PostMapping,
+
+50
+00:01:57,000 --> 00:01:59,000
+so we'll see that when to use what.
+
+51
+00:01:59,000 --> 00:02:01,000
+But at this point we're using RequestMapping
+
+52
+00:02:01,000 --> 00:02:04,000
+to map the request and is able to call the index.jsp.
+
+53
+00:02:04,000 --> 00:02:06,000
+Now question is no, why it's not working.
+
+54
+00:02:06,000 --> 00:02:09,000
+The reason it is not working is because by default,
+
+55
+00:02:09,000 --> 00:02:12,000
+springboard does not support JSP page.
+
+56
+00:02:12,000 --> 00:02:14,000
+So we have to basically convert.
+
+57
+00:02:14,000 --> 00:02:16,000
+So, remember we talked about conversion,
+
+58
+00:02:16,000 --> 00:02:18,000
+we have to convert your JSP into Servlet?
+
+59
+00:02:18,000 --> 00:02:22,000
+Who will do that? And that's where you need a help here.
+
+60
+00:02:22,000 --> 00:02:25,000
+So we have to add one more dependency to achieve that,
+
+61
+00:02:25,000 --> 00:02:28,000
+which is called a Tomcat Jasper.
+
+62
+00:02:28,000 --> 00:02:32,000
+So I will go to my browser and go to your MEN repository
+
+63
+00:02:32,000 --> 00:02:35,000
+and search for Tomcat Jasper.
+
+64
+00:02:35,000 --> 00:02:37,000
+This is the library which we want.
+
+65
+00:02:37,000 --> 00:02:41,000
+So if you click on this, okay, which one, which version?
+
+66
+00:02:41,000 --> 00:02:44,000
+Now this depend upon which version you're using
+
+67
+00:02:44,000 --> 00:02:45,000
+for your Tomcat.
+
+68
+00:02:45,000 --> 00:02:48,000
+So if you scroll down, the Tomcat version,
+
+69
+00:02:48,000 --> 00:02:51,000
+which we're using is 10.1.16.
+
+70
+00:02:51,000 --> 00:02:56,000
+Let's use the same one, which is here, click on this,
+
+71
+00:02:56,000 --> 00:02:57,000
+you need this dependency.
+
+72
+00:02:57,000 --> 00:03:01,000
+Go back, page it here. I don't want this advertisement.
+
+73
+00:03:02,000 --> 00:03:05,000
+Okay, let's import this particular package.
+
+74
+00:03:05,000 --> 00:03:07,000
+Reload your Maven. And that's done.
+
+75
+00:03:07,000 --> 00:03:10,000
+We got this dependency and I hope this time it'll work.
+
+76
+00:03:10,000 --> 00:03:13,000
+So if you go back to your browser now, go back
+
+77
+00:03:13,000 --> 00:03:15,000
+to your homepage, which was not working.
+
+78
+00:03:15,000 --> 00:03:20,000
+Let's do localhost:8080, enter, and boom,
+
+79
+00:03:20,000 --> 00:03:22,000
+you got the output, which is hello world.
+
+80
+00:03:22,000 --> 00:03:23,000
+This time it is not saying download is
+
+81
+00:03:23,000 --> 00:03:27,000
+because now we are able to convert the JSP into Servlet
+
+82
+00:03:27,000 --> 00:03:28,000
+and that's what is running now.
+
+83
+00:03:29,000 --> 00:03:32,000
+Oh, now you're not thinking, you know,
+
+84
+00:03:32,000 --> 00:03:33,000
+a lot of dependencies.
+
+85
+00:03:33,000 --> 00:03:35,000
+See, technically we'll not be using JSP in
+
+86
+00:03:35,000 --> 00:03:36,000
+your actual project, right?
+
+87
+00:03:36,000 --> 00:03:38,000
+You'll be using some front end technologies.
+
+88
+00:03:38,000 --> 00:03:41,000
+That's the, that's how we are building application now.
+
+89
+00:03:41,000 --> 00:03:44,000
+And what you will be turning there is the data. That's it.
+
+90
+00:03:44,000 --> 00:03:46,000
+So at this point, we are doing a page,
+
+91
+00:03:46,000 --> 00:03:47,000
+but we'll see how do we return data?
+
+92
+00:03:47,000 --> 00:03:52,000
+Not the page, but at this point it's working,
+
+93
+00:03:52,000 --> 00:03:53,000
+so let's be happy with it.
+
+94
+00:03:53,000 --> 00:03:56,000
+And we are using request mapping to map the request.
+

12 - Spring Boot Web/010 Source-Code.url

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+URL=https://github.com/navinreddy20/spring6-course/tree/f1161e151ea06b68810b3cae03005d4955a96a8b/6%20Spring%20%20Boot%20Web/5.10%20RequestMapping

12 - Spring Boot Web/011 Sending data to Controller_en.srt

@@ -0,0 +1,484 @@
+1
+00:00:00,000 --> 00:00:03,000
+(bright music)
+
+2
+00:00:03,000 --> 00:00:06,000
+-: So we got the homepage, which is hello world.
+
+3
+00:00:06,000 --> 00:00:08,000
+But then we don't want a simple page here, right?
+
+4
+00:00:08,000 --> 00:00:10,000
+Maybe I want to perform some operation.
+
+5
+00:00:10,000 --> 00:00:13,000
+See, the entire idea of having a backend
+
+6
+00:00:13,000 --> 00:00:16,000
+is where a user will request for something.
+
+7
+00:00:16,000 --> 00:00:18,000
+Maybe you want to add two numbers, simplest stuff,
+
+8
+00:00:18,000 --> 00:00:22,000
+or you want to find the data about something.
+
+9
+00:00:22,000 --> 00:00:24,000
+Or maybe you want to see the listing of a product
+
+10
+00:00:24,000 --> 00:00:26,000
+by the price.
+
+11
+00:00:26,000 --> 00:00:29,000
+So basically what you're doing is a client sends a request
+
+12
+00:00:29,000 --> 00:00:30,000
+for the server, server does some processing
+
+13
+00:00:30,000 --> 00:00:33,000
+and give something back to the client.
+
+14
+00:00:33,000 --> 00:00:35,000
+Now at this point, I don't don't want
+
+15
+00:00:35,000 --> 00:00:36,000
+to get into complex logic
+
+16
+00:00:36,000 --> 00:00:39,000
+because we are here to learn Spring Framework,
+
+17
+00:00:39,000 --> 00:00:42,000
+not to make complex logic.
+
+18
+00:00:42,000 --> 00:00:44,000
+And that's why we'll go for a simple example.
+
+19
+00:00:44,000 --> 00:00:45,000
+How do we add two numbers?
+
+20
+00:00:45,000 --> 00:00:48,000
+Now, why we are doing this for a simple reason, we want
+
+21
+00:00:48,000 --> 00:00:50,000
+to send some data to the server.
+
+22
+00:00:50,000 --> 00:00:53,000
+We want to ask server, Hey, you know you have
+
+23
+00:00:53,000 --> 00:00:54,000
+to do something for me.
+
+24
+00:00:54,000 --> 00:00:56,000
+Sever say, "okay, we'll do it."
+
+25
+00:00:56,000 --> 00:00:58,000
+Give back the data to the client.
+
+26
+00:00:58,000 --> 00:01:01,000
+That's the process we want to achieve. So how do we do that?
+
+27
+00:01:01,000 --> 00:01:03,000
+So first of all, in this homepage, I don't want
+
+28
+00:01:03,000 --> 00:01:05,000
+to simply print a hello world.
+
+29
+00:01:05,000 --> 00:01:08,000
+Maybe I want to add two numbers and to achieve that,
+
+30
+00:01:08,000 --> 00:01:11,000
+first of all, you need a page where you can add two numbers.
+
+31
+00:01:11,000 --> 00:01:13,000
+So what I will do is I need a form here
+
+32
+00:01:13,000 --> 00:01:14,000
+so they can submit data.
+
+33
+00:01:14,000 --> 00:01:17,000
+So when I say form, it means I need two text field.
+
+34
+00:01:17,000 --> 00:01:20,000
+I need a button where I can click the button
+
+35
+00:01:20,000 --> 00:01:24,000
+and this two text field data should go to the server.
+
+36
+00:01:24,000 --> 00:01:26,000
+And for that we have to create a form.
+
+37
+00:01:26,000 --> 00:01:28,000
+Now instead of wasting our time writing the code,
+
+38
+00:01:28,000 --> 00:01:30,000
+I do have the code with me.
+
+39
+00:01:30,000 --> 00:01:31,000
+So that's our simple form.
+
+40
+00:01:31,000 --> 00:01:35,000
+You can see I'm using a label for enter the first number,
+
+41
+00:01:35,000 --> 00:01:37,000
+and then we have a text typed
+
+42
+00:01:37,000 --> 00:01:40,000
+or text box you can say, which is a typed text
+
+43
+00:01:40,000 --> 00:01:42,000
+and it takes a number.
+
+44
+00:01:42,000 --> 00:01:43,000
+And the ID for that is num1,
+
+45
+00:01:43,000 --> 00:01:45,000
+because these ID are important.
+
+46
+00:01:45,000 --> 00:01:48,000
+And then the ID for the second one is num2.
+
+47
+00:01:48,000 --> 00:01:51,000
+And then we have a button there which is called submit.
+
+48
+00:01:51,000 --> 00:01:53,000
+And maybe I just want to change this from hello world
+
+49
+00:01:53,000 --> 00:01:56,000
+to Telusko Calculator.
+
+50
+00:01:56,000 --> 00:02:00,000
+That's it. Nothing fancy, just a simple page here.
+
+51
+00:02:00,000 --> 00:02:02,000
+And now let me restart this
+
+52
+00:02:02,000 --> 00:02:04,000
+just to see if I can get this page.
+
+53
+00:02:04,000 --> 00:02:06,000
+Is it looking good on the screen?
+
+54
+00:02:06,000 --> 00:02:10,000
+So go back to your browser and say refresh, take some time
+
+55
+00:02:10,000 --> 00:02:11,000
+and you can see we got a calculator.
+
+56
+00:02:11,000 --> 00:02:12,000
+Not looking good.
+
+57
+00:02:12,000 --> 00:02:13,000
+But again, we are not here
+
+58
+00:02:13,000 --> 00:02:16,000
+to make some beautiful things, right?
+
+59
+00:02:16,000 --> 00:02:18,000
+I mean we want to make beautiful things,
+
+60
+00:02:18,000 --> 00:02:20,000
+but not in the front end, in the back end.
+
+61
+00:02:20,000 --> 00:02:21,000
+But still it doesn't look good, right?
+
+62
+00:02:21,000 --> 00:02:23,000
+Let's have something here.
+
+63
+00:02:23,000 --> 00:02:25,000
+So what I will do is I will create a CSS file here
+
+64
+00:02:27,000 --> 00:02:28,000
+just to style this stuff.
+
+65
+00:02:28,000 --> 00:02:30,000
+Let me create a CSS file here.
+
+66
+00:02:30,000 --> 00:02:33,000
+So I'll say style.css.
+
+67
+00:02:33,000 --> 00:02:38,000
+And in this style.css, I want to have some CSS code.
+
+68
+00:02:38,000 --> 00:02:40,000
+And again, I'm not here to teach you CSS.
+
+69
+00:02:40,000 --> 00:02:43,000
+So let me just get some CSS file here
+
+70
+00:02:43,000 --> 00:02:45,000
+just to make our page beautiful.
+
+71
+00:02:45,000 --> 00:02:48,000
+And we have to also make sure that we use the CSS here.
+
+72
+00:02:48,000 --> 00:02:51,000
+So I'll put that in the head tag
+
+73
+00:02:51,000 --> 00:02:53,000
+and we have to provide the link for the CSS
+
+74
+00:02:53,000 --> 00:02:55,000
+and let me do that here.
+
+75
+00:02:55,000 --> 00:02:56,000
+So basically by doing this,
+
+76
+00:02:56,000 --> 00:03:00,000
+what we are doing is we are having a CSS in the code so
+
+77
+00:03:00,000 --> 00:03:03,000
+that it'll make the page bit beautiful, not very beautiful
+
+78
+00:03:03,000 --> 00:03:06,000
+because we tried to use some Java theme, coffee theme
+
+79
+00:03:06,000 --> 00:03:08,000
+here with the CSS.
+
+80
+00:03:08,000 --> 00:03:09,000
+Let's see if that works out.
+
+81
+00:03:09,000 --> 00:03:12,000
+Let's run this and taking some time.
+
+82
+00:03:12,000 --> 00:03:15,000
+Okay, so you got a page here.
+
+83
+00:03:15,000 --> 00:03:17,000
+Not great looking but manageable, right?
+
+84
+00:03:17,000 --> 00:03:20,000
+So we've got a page and I can provide some numbers here.
+
+85
+00:03:20,000 --> 00:03:22,000
+So let's say I want to add six and seven,
+
+86
+00:03:22,000 --> 00:03:26,000
+and the output I want here is 13.
+
+87
+00:03:26,000 --> 00:03:27,000
+Now of course we will say, Hey, we can do that
+
+88
+00:03:27,000 --> 00:03:28,000
+with simple JavaScript, right?
+
+89
+00:03:28,000 --> 00:03:31,000
+We can write a client site code, add this to number,
+
+90
+00:03:31,000 --> 00:03:32,000
+see we can do whatever we want.
+
+91
+00:03:32,000 --> 00:03:36,000
+We can simply take a mobile phone, get a open the calculator
+
+92
+00:03:36,000 --> 00:03:37,000
+and add this two numbers.
+
+93
+00:03:37,000 --> 00:03:38,000
+Not the main thing here.
+
+94
+00:03:38,000 --> 00:03:40,000
+The main thing is what if I want
+
+95
+00:03:40,000 --> 00:03:43,000
+to build a Spring application where the client sends data
+
+96
+00:03:43,000 --> 00:03:45,000
+to the server and you want to perform some operation.
+
+97
+00:03:45,000 --> 00:03:49,000
+So when I click on submit here, I want this to work.
+
+98
+00:03:49,000 --> 00:03:52,000
+And you can, you can see at this point it says 4 0 4.
+
+99
+00:03:52,000 --> 00:03:54,000
+So basically your server is not happy by saying, hey,
+
+100
+00:03:54,000 --> 00:03:57,000
+you know, you're sending some request
+
+101
+00:03:57,000 --> 00:03:59,000
+and I don't have any idea what you want me to do.
+
+102
+00:03:59,000 --> 00:04:02,000
+I would say, okay, it's not very complex.
+
+103
+00:04:02,000 --> 00:04:04,000
+If someone sends request for the add.
+
+104
+00:04:04,000 --> 00:04:06,000
+Now you can see when you say submit it,
+
+105
+00:04:06,000 --> 00:04:08,000
+you're sending a request for the add URL.
+
+106
+00:04:09,000 --> 00:04:12,000
+And if you observe the URL here, which is not visible
+
+107
+00:04:12,000 --> 00:04:14,000
+by default in Safari,
+
+108
+00:04:14,000 --> 00:04:15,000
+but you can see we got a URL here,
+
+109
+00:04:15,000 --> 00:04:19,000
+it says localized:8080/add.
+
+110
+00:04:19,000 --> 00:04:21,000
+Then we are passing two values.
+
+111
+00:04:21,000 --> 00:04:23,000
+So in the URL itself, we are passing the values.
+
+112
+00:04:23,000 --> 00:04:26,000
+Number one value is six, and num two value is seven.
+
+113
+00:04:26,000 --> 00:04:29,000
+And the URL and the request we're sending is for the add.
+
+114
+00:04:29,000 --> 00:04:31,000
+Okay? Initially we were sending the request
+
+115
+00:04:31,000 --> 00:04:32,000
+for the homepage, but now we are sending the
+
+116
+00:04:32,000 --> 00:04:33,000
+request for the add.
+
+117
+00:04:33,000 --> 00:04:34,000
+Okay.
+
+118
+00:04:34,000 --> 00:04:36,000
+That means we need a controller
+
+119
+00:04:36,000 --> 00:04:38,000
+who can accept this request.
+
+120
+00:04:38,000 --> 00:04:41,000
+Now question arise how we look, create that controller.
+
+121
+00:04:41,000 --> 00:04:42,000
+Let's see that in the next video.
+

12 - Spring Boot Web/011 Source-Code.url

@@ -0,0 +1,2 @@
+[InternetShortcut]
+URL=https://github.com/navinreddy20/spring6-course/tree/f1161e151ea06b68810b3cae03005d4955a96a8b/6%20Spring%20%20Boot%20Web/5.11%20Sending%20data%20to%20Controller

12 - Spring Boot Web/012 Accepting Data the servlet way_en.srt

@@ -0,0 +1,744 @@
+1
+00:00:00,000 --> 00:00:03,000
+(soft music)
+
+2
+00:00:03,000 --> 00:00:06,000
+-: Now, let's try to create a controller
+
+3
+00:00:06,000 --> 00:00:08,000
+which can accept this request.
+
+4
+00:00:08,000 --> 00:00:09,000
+Because if you see the HomeController.
+
+5
+00:00:09,000 --> 00:00:13,000
+Of course, we can create a new controller here, a new class,
+
+6
+00:00:13,000 --> 00:00:16,000
+but then Spring allows you to have multiple controllers
+
+7
+00:00:16,000 --> 00:00:17,000
+in one controller.
+
+8
+00:00:17,000 --> 00:00:18,000
+So what I'm saying is
+
+9
+00:00:18,000 --> 00:00:21,000
+Spring allows you to have multiple requests
+
+10
+00:00:21,000 --> 00:00:24,000
+mapped in one particular controller.
+
+11
+00:00:24,000 --> 00:00:26,000
+And logically, if you have different types of controllers,
+
+12
+00:00:26,000 --> 00:00:28,000
+let's say you have different types of requests.
+
+13
+00:00:28,000 --> 00:00:30,000
+So if you're making an e-commerce website
+
+14
+00:00:30,000 --> 00:00:34,000
+and you want to request for user, so user addition,
+
+15
+00:00:34,000 --> 00:00:38,000
+or maybe adding a user, deleting a user, or updating a user,
+
+16
+00:00:38,000 --> 00:00:40,000
+so everything that deals with the user,
+
+17
+00:00:40,000 --> 00:00:41,000
+you can put that in one controller.
+
+18
+00:00:41,000 --> 00:00:44,000
+Maybe you can have the controller for products
+
+19
+00:00:44,000 --> 00:00:46,000
+where you can add a product, remove a product,
+
+20
+00:00:46,000 --> 00:00:48,000
+update a product.
+
+21
+00:00:48,000 --> 00:00:51,000
+You can also have a controller for orders, place the order,
+
+22
+00:00:51,000 --> 00:00:54,000
+delete the order, change the status of the order.
+
+23
+00:00:54,000 --> 00:00:57,000
+So you can have that in the OrderController.
+
+24
+00:00:57,000 --> 00:00:59,000
+But here, since we only have two controls now,
+
+25
+00:00:59,000 --> 00:01:02,000
+let's work with the same HomeController.
+
+26
+00:01:02,000 --> 00:01:02,000
+So what I will do is,
+
+27
+00:01:02,000 --> 00:01:05,000
+if you want to have something that will accept the request,
+
+28
+00:01:05,000 --> 00:01:06,000
+you have to create another method.
+
+29
+00:01:06,000 --> 00:01:09,000
+So at this point, I will say public String
+
+30
+00:01:09,000 --> 00:01:12,000
+because maybe I want to return a page, of course, right?
+
+31
+00:01:12,000 --> 00:01:15,000
+When you add two numbers, you also want a page,
+
+32
+00:01:15,000 --> 00:01:17,000
+and that's what you're expecting in the browser.
+
+33
+00:01:17,000 --> 00:01:20,000
+So if you see in the output, when you send this request,
+
+34
+00:01:20,000 --> 00:01:23,000
+this should be another page.
+
+35
+00:01:23,000 --> 00:01:24,000
+Okay, so that means I have to return something,
+
+36
+00:01:24,000 --> 00:01:26,000
+and then we can have a method name.
+
+37
+00:01:26,000 --> 00:01:28,000
+Method name can be anything. I will say add here
+
+38
+00:01:28,000 --> 00:01:30,000
+and open bracket close.
+
+39
+00:01:30,000 --> 00:01:33,000
+Okay, now here, I want to return the name of a page.
+
+40
+00:01:33,000 --> 00:01:34,000
+So what's should be the name of the page?
+
+41
+00:01:34,000 --> 00:01:36,000
+I will simply say return.
+
+42
+00:01:36,000 --> 00:01:38,000
+We can return any page name.
+
+43
+00:01:38,000 --> 00:01:42,000
+I will say return "result.jsp".
+
+44
+00:01:42,000 --> 00:01:44,000
+And, okay, that's done.
+
+45
+00:01:44,000 --> 00:01:45,000
+But then will it be getting called?
+
+46
+00:01:45,000 --> 00:01:47,000
+Of course not.
+
+47
+00:01:47,000 --> 00:01:49,000
+So basically, we have to map it.
+
+48
+00:01:49,000 --> 00:01:50,000
+Now how do you map it?
+
+49
+00:01:50,000 --> 00:01:53,000
+Of course, for mapping, we can use @RequestMapping.
+
+50
+00:01:53,000 --> 00:01:56,000
+And then in the bracket, we can mention the URL.
+
+51
+00:01:56,000 --> 00:02:01,000
+The URL for this is add, because if you see on the homepage,
+
+52
+00:02:01,000 --> 00:02:04,000
+we are saying, "This is my website name,
+
+53
+00:02:04,000 --> 00:02:09,000
+and then this is the URL," the URL path basically,
+
+54
+00:02:09,000 --> 00:02:10,000
+and that's what you have to mention.
+
+55
+00:02:10,000 --> 00:02:11,000
+This is for the add request,
+
+56
+00:02:11,000 --> 00:02:13,000
+and this method should be called.
+
+57
+00:02:13,000 --> 00:02:14,000
+Is it really working?
+
+58
+00:02:14,000 --> 00:02:15,000
+Let's try.
+
+59
+00:02:15,000 --> 00:02:17,000
+So what I will do is, before making any changes,
+
+60
+00:02:17,000 --> 00:02:19,000
+let's rerun this and see the output.
+
+61
+00:02:19,000 --> 00:02:21,000
+Go back to your browser,
+
+62
+00:02:21,000 --> 00:02:23,000
+and I will just say "Submit" once again,
+
+63
+00:02:23,000 --> 00:02:27,000
+because I have not made any changes in the index.jsp.
+
+64
+00:02:27,000 --> 00:02:30,000
+I will click on "Submit," and we got an error.
+
+65
+00:02:30,000 --> 00:02:32,000
+It may not be able to find it,
+
+66
+00:02:32,000 --> 00:02:34,000
+or maybe I will just refresh the page.
+
+67
+00:02:37,000 --> 00:02:39,000
+Is the mapping happening?
+
+68
+00:02:39,000 --> 00:02:40,000
+Maybe it is happening,
+
+69
+00:02:40,000 --> 00:02:42,000
+or maybe it is searching for result.jsp.
+
+70
+00:02:42,000 --> 00:02:44,000
+Not able to find it the result.jsp.
+
+71
+00:02:44,000 --> 00:02:45,000
+To prove that or to check that,
+
+72
+00:02:45,000 --> 00:02:49,000
+we can say "in add" just to see if this is working.
+
+73
+00:02:49,000 --> 00:02:50,000
+You know, we should always go step by step;
+
+74
+00:02:50,000 --> 00:02:53,000
+otherwise, we are not sure at what point we got the error.
+
+75
+00:02:53,000 --> 00:02:55,000
+So I'm just saying "in add" now.
+
+76
+00:02:55,000 --> 00:02:59,000
+Let's go back here and say "Submit,"
+
+77
+00:03:00,000 --> 00:03:02,000
+and you can see in this it says "in add."
+
+78
+00:03:02,000 --> 00:03:05,000
+So that means, yes, we are able to call this.
+
+79
+00:03:05,000 --> 00:03:08,000
+But now, it's not just about calling this, right?
+
+80
+00:03:08,000 --> 00:03:10,000
+Basically, it's not able to find result.jsp.
+
+81
+00:03:10,000 --> 00:03:14,000
+Do we have result.jsp in the file, or we don't yet?
+
+82
+00:03:14,000 --> 00:03:15,000
+So let me create a file,
+
+83
+00:03:15,000 --> 00:03:18,000
+or maybe I will just copy-paste this index.jsp here
+
+84
+00:03:18,000 --> 00:03:21,000
+with a different name: result.jsp.
+
+85
+00:03:21,000 --> 00:03:24,000
+And we don't need a form here, okay?
+
+86
+00:03:24,000 --> 00:03:26,000
+What we need is to print something.
+
+87
+00:03:26,000 --> 00:03:30,000
+So I'll print "Result is."
+
+88
+00:03:30,000 --> 00:03:30,000
+That's it.
+
+89
+00:03:30,000 --> 00:03:32,000
+Nothing fancy, I'm just saying "Result is."
+
+90
+00:03:32,000 --> 00:03:34,000
+If I refresh, you can see it says "Result is."
+
+91
+00:03:34,000 --> 00:03:36,000
+So it is able to find the page now,
+
+92
+00:03:36,000 --> 00:03:37,000
+but we are not printing anything.
+
+93
+00:03:37,000 --> 00:03:40,000
+So what is happening is, when you send the first request,
+
+94
+00:03:40,000 --> 00:03:41,000
+the request goes to the homepage.
+
+95
+00:03:41,000 --> 00:03:43,000
+It is bringing index.jsp.
+
+96
+00:03:43,000 --> 00:03:47,000
+From index.jsp, you are basically sending an add request,
+
+97
+00:03:47,000 --> 00:03:48,000
+and the add request says,
+
+98
+00:03:48,000 --> 00:03:50,000
+"Okay, we have to call result.jsp."
+
+99
+00:03:50,000 --> 00:03:53,000
+But the question arise, who is doing this mapping?
+
+100
+00:03:53,000 --> 00:03:54,000
+If you go back to servlets,
+
+101
+00:03:54,000 --> 00:03:55,000
+remember, for every servlet
+
+102
+00:03:55,000 --> 00:03:58,000
+we have to do the mapping in the XML file.
+
+103
+00:03:58,000 --> 00:04:01,000
+We are not doing mapping here, so who is calling it?
+
+104
+00:04:01,000 --> 00:04:03,000
+So the thing is, there's something called DispatcherServlet.
+
+105
+00:04:03,000 --> 00:04:05,000
+Again, we will not be discussing much
+
+106
+00:04:05,000 --> 00:04:06,000
+about DispatcherServlet now.
+
+107
+00:04:06,000 --> 00:04:07,000
+We will be talking about that later.
+
+108
+00:04:07,000 --> 00:04:09,000
+But there is DispatcherServlet
+
+109
+00:04:09,000 --> 00:04:11,000
+who is responsible for mapping all these requests.
+
+110
+00:04:11,000 --> 00:04:13,000
+So it sees, "Okay, what is the request?
+
+111
+00:04:13,000 --> 00:04:15,000
+This is the request, call this method.
+
+112
+00:04:15,000 --> 00:04:17,000
+This is the request, call this method.
+
+113
+00:04:17,000 --> 00:04:19,000
+Someone is returning index.jsp, search for it."
+
+114
+00:04:19,000 --> 00:04:22,000
+So that's the job of DispatcherServlet.
+
+115
+00:04:22,000 --> 00:04:23,000
+Again, we will discuss that later.
+
+116
+00:04:23,000 --> 00:04:25,000
+But yeah, it is able to call it.
+
+117
+00:04:25,000 --> 00:04:27,000
+Okay, so that's the step one.
+
+118
+00:04:27,000 --> 00:04:30,000
+The next step is, basically, we have to accept the values.
+
+119
+00:04:30,000 --> 00:04:34,000
+Remember, in the browser, we are sending these values.
+
+120
+00:04:34,000 --> 00:04:36,000
+We have to accept them.
+
+121
+00:04:36,000 --> 00:04:37,000
+How will you do that?
+
+122
+00:04:37,000 --> 00:04:38,000
+See there are two ways of doing it:
+
+123
+00:04:38,000 --> 00:04:41,000
+one is the servlet way, and the second is the Spring way.
+
+124
+00:04:41,000 --> 00:04:43,000
+Let's start with the servlet way,
+
+125
+00:04:43,000 --> 00:04:44,000
+and then we'll move towards the Spring way.
+
+126
+00:04:44,000 --> 00:04:48,000
+In servlet, if you want to accept the data from a client,
+
+127
+00:04:48,000 --> 00:04:51,000
+we have to use something called HttpServletRequest.
+
+128
+00:04:51,000 --> 00:04:53,000
+We have done that before as well, right?
+
+129
+00:04:53,000 --> 00:04:57,000
+So in this bracket, I can simply say HttpServletRequest.
+
+130
+00:04:58,000 --> 00:04:59,000
+I can create the object,
+
+131
+00:04:59,000 --> 00:05:02,000
+or I can create a reference called req.
+
+132
+00:05:02,000 --> 00:05:03,000
+Now, the question arises,
+
+133
+00:05:03,000 --> 00:05:05,000
+who is responsible for giving this object?
+
+134
+00:05:05,000 --> 00:05:08,000
+Mind you, we are working on the Spring Framework.
+
+135
+00:05:08,000 --> 00:05:11,000
+So when you specify the HttpServletRequest here,
+
+136
+00:05:11,000 --> 00:05:13,000
+it is Spring's responsibility
+
+137
+00:05:13,000 --> 00:05:15,000
+to assign you the object for this.
+
+138
+00:05:15,000 --> 00:05:17,000
+You just say, "I want this request object."
+
+139
+00:05:17,000 --> 00:05:18,000
+Spring says, "Okay, done."
+
+140
+00:05:18,000 --> 00:05:20,000
+Now once you have this object, you can get the values.
+
+141
+00:05:20,000 --> 00:05:22,000
+How will you get the values?
+
+142
+00:05:22,000 --> 00:05:24,000
+You can say req.getParameter.
+
+143
+00:05:24,000 --> 00:05:25,000
+So that's the method you have to use
+
+144
+00:05:25,000 --> 00:05:27,000
+to get the value from the request object.
+
+145
+00:05:27,000 --> 00:05:28,000
+Because, see, anyway,
+
+146
+00:05:28,000 --> 00:05:30,000
+when a client sends a request to the server,
+
+147
+00:05:30,000 --> 00:05:31,000
+the request object will have all the data.
+
+148
+00:05:31,000 --> 00:05:33,000
+So we just have to fetch the data.
+
+149
+00:05:33,000 --> 00:05:34,000
+So you have to say getParameter.
+
+150
+00:05:34,000 --> 00:05:36,000
+But for which value?
+
+151
+00:05:36,000 --> 00:05:39,000
+In the browser, if you see, we have num1 and num2.
+
+152
+00:05:39,000 --> 00:05:41,000
+So we got two parameters.
+
+153
+00:05:41,000 --> 00:05:45,000
+I will say num1, but then this will be a type of String.
+
+154
+00:05:45,000 --> 00:05:47,000
+If you try to assign that to a variable.
+
+155
+00:05:47,000 --> 00:05:49,000
+So let's say you have int num1 here.
+
+156
+00:05:49,000 --> 00:05:51,000
+So of course, this will not work
+
+157
+00:05:51,000 --> 00:05:53,000
+because the getParameter returns a String.
+
+158
+00:05:53,000 --> 00:05:54,000
+So we have to basically convert this.
+
+159
+00:05:54,000 --> 00:05:57,000
+You have to parse it with the Integer.parseInt.
+
+160
+00:05:57,000 --> 00:05:58,000
+That's done.
+
+161
+00:05:58,000 --> 00:06:00,000
+And we need this for the second variable as well.
+
+162
+00:06:00,000 --> 00:06:02,000
+So I will just copy this, paste it here,
+
+163
+00:06:02,000 --> 00:06:04,000
+and this should be num2.
+
+164
+00:06:04,000 --> 00:06:05,000
+This should be num2.
+
+165
+00:06:05,000 --> 00:06:08,000
+Now, by doing this, we are getting the values,
+
+166
+00:06:08,000 --> 00:06:10,000
+and then we just have to add them.
+
+167
+00:06:10,000 --> 00:06:14,000
+So I will say int result = num1 + num2.
+
+168
+00:06:14,000 --> 00:06:16,000
+Again, the logic can be anything, right?
+
+169
+00:06:16,000 --> 00:06:17,000
+So whatever logic you have,
+
+170
+00:06:17,000 --> 00:06:19,000
+you can write inside this method,
+
+171
+00:06:19,000 --> 00:06:21,000
+and that's what we're doing here.
+
+172
+00:06:21,000 --> 00:06:23,000
+Once you've got this value, your job is done, right?
+
+173
+00:06:23,000 --> 00:06:26,000
+You got the values, you are adding them.
+
+174
+00:06:26,000 --> 00:06:29,000
+At this point, I will just print the result in the console.
+
+175
+00:06:29,000 --> 00:06:31,000
+So here, this is where I want to print it.
+
+176
+00:06:31,000 --> 00:06:32,000
+So I will just restart this
+
+177
+00:06:32,000 --> 00:06:35,000
+and see if I can actually get the values.
+
+178
+00:06:35,000 --> 00:06:37,000
+So I'll go back here and say "Submit."
+
+179
+00:06:37,000 --> 00:06:40,000
+Okay, it says "Result is," but we are not printing it here;
+
+180
+00:06:40,000 --> 00:06:41,000
+we are printing it on the console.
+
+181
+00:06:41,000 --> 00:06:42,000
+And the console says 13.
+
+182
+00:06:42,000 --> 00:06:44,000
+So 6 + 7 = 13, and it's working.
+
+183
+00:06:44,000 --> 00:06:46,000
+But then I don't want to print on the console, right?
+
+184
+00:06:46,000 --> 00:06:48,000
+I want to print it on the page.
+
+185
+00:06:48,000 --> 00:06:49,000
+How will you do that?
+
+186
+00:06:49,000 --> 00:06:51,000
+Let's see that in the next video.
+

12 - Spring Boot Web/012 Source-Code.url

@@ -0,0 +1,2 @@
+[InternetShortcut]
+URL=https://github.com/navinreddy20/spring6-course/tree/f1161e151ea06b68810b3cae03005d4955a96a8b/6%20Spring%20%20Boot%20Web/5.12%20Accepting%20Data%20the%20servlet%20way

12 - Spring Boot Web/013 Display Data on Result Page_en.srt

@@ -0,0 +1,540 @@
+1
+00:00:00,000 --> 00:00:02,000
+(upbeat music)
+
+2
+00:00:02,000 --> 00:00:06,000
+-: Okay, now we are printing the data on the console.
+
+3
+00:00:06,000 --> 00:00:09,000
+We don't do that, we want to print this on the result page.
+
+4
+00:00:09,000 --> 00:00:11,000
+To do that, first of all,
+
+5
+00:00:11,000 --> 00:00:13,000
+we have to send this data to the result page.
+
+6
+00:00:13,000 --> 00:00:15,000
+How will you do that, see, there are multiple ways
+
+7
+00:00:15,000 --> 00:00:17,000
+of sending this data to the result page.
+
+8
+00:00:17,000 --> 00:00:19,000
+Of course, you cannot simply expect
+
+9
+00:00:19,000 --> 00:00:22,000
+that this data will be available in this page.
+
+10
+00:00:22,000 --> 00:00:24,000
+You have to send it, there are multiple ways
+
+11
+00:00:24,000 --> 00:00:26,000
+you can basically pass through the URL.
+
+12
+00:00:26,000 --> 00:00:28,000
+You can put a question mark here
+
+13
+00:00:28,000 --> 00:00:30,000
+and you can say the result is this,
+
+14
+00:00:30,000 --> 00:00:33,000
+or you can use something called session.
+
+15
+00:00:33,000 --> 00:00:36,000
+So in servlet, basically we have a concept of session.
+
+16
+00:00:36,000 --> 00:00:38,000
+I mean when I say servlet, it is also applicable for spring
+
+17
+00:00:38,000 --> 00:00:41,000
+because behind the scene everything is servlet.
+
+18
+00:00:41,000 --> 00:00:46,000
+So we have to put the data in a session object.
+
+19
+00:00:46,000 --> 00:00:48,000
+Now what your session, so basically when you have multiple
+
+20
+00:00:48,000 --> 00:00:51,000
+pages and if a user is accessing multiple pages,
+
+21
+00:00:51,000 --> 00:00:55,000
+you want to maintain this data between the pages.
+
+22
+00:00:55,000 --> 00:00:57,000
+And the way you can do that is with the help of session
+
+23
+00:00:57,000 --> 00:00:59,000
+and to get the hold on a session,
+
+24
+00:00:59,000 --> 00:01:01,000
+what you can do is you can just
+
+25
+00:01:01,000 --> 00:01:03,000
+pass this session object here.
+
+26
+00:01:03,000 --> 00:01:05,000
+So you can create a HttpSession.
+
+27
+00:01:07,000 --> 00:01:10,000
+Now we just specify, so this is an interface.
+
+28
+00:01:10,000 --> 00:01:12,000
+If you click on HttpSession, this is an interface
+
+29
+00:01:12,000 --> 00:01:14,000
+and we are creating a reference for it.
+
+30
+00:01:14,000 --> 00:01:17,000
+Now who is responsible to inject the object?
+
+31
+00:01:17,000 --> 00:01:18,000
+You know it, spring framework.
+
+32
+00:01:18,000 --> 00:01:22,000
+Now with the object, I just have to add this data,
+
+33
+00:01:22,000 --> 00:01:25,000
+visual data in the session.
+
+34
+00:01:25,000 --> 00:01:28,000
+So the way you can do that is by saying session dot.
+
+35
+00:01:28,000 --> 00:01:31,000
+So it has a method called set attribute.
+
+36
+00:01:31,000 --> 00:01:32,000
+And in this you have to pass two things.
+
+37
+00:01:32,000 --> 00:01:35,000
+The name of a variable or name of the data, which result,
+
+38
+00:01:35,000 --> 00:01:38,000
+and the actual data which is result.
+
+39
+00:01:38,000 --> 00:01:40,000
+So basically you have to do, you have to pass two things.
+
+40
+00:01:40,000 --> 00:01:43,000
+One is the name and second is the data.
+
+41
+00:01:43,000 --> 00:01:46,000
+So name is result and the data is result,
+
+42
+00:01:46,000 --> 00:01:47,000
+which is the value in this case.
+
+43
+00:01:47,000 --> 00:01:51,000
+And that's it, so when you call result JSP,
+
+44
+00:01:51,000 --> 00:01:52,000
+and see we talked about it, right?
+
+45
+00:01:52,000 --> 00:01:56,000
+So when you call add, the dispatcher is calling result JSP.
+
+46
+00:01:56,000 --> 00:01:58,000
+So that means that there's two different pages.
+
+47
+00:01:58,000 --> 00:02:00,000
+So we have to maintain this data.
+
+48
+00:02:00,000 --> 00:02:03,000
+The way we can do that is with help of session.
+
+49
+00:02:03,000 --> 00:02:06,000
+So we are adding this data in the session object.
+
+50
+00:02:06,000 --> 00:02:09,000
+Okay, we have done that right now, we have added it.
+
+51
+00:02:09,000 --> 00:02:11,000
+How will you get this data in the result page?
+
+52
+00:02:11,000 --> 00:02:14,000
+Now that's tricky, so what you can do is here,
+
+53
+00:02:14,000 --> 00:02:17,000
+you can print, in fact you can print it here itself.
+
+54
+00:02:17,000 --> 00:02:21,000
+You can print the data, you can simply say result,
+
+55
+00:02:21,000 --> 00:02:22,000
+but will it work?
+
+56
+00:02:22,000 --> 00:02:24,000
+Of course not, right, this look like a normal text.
+
+57
+00:02:24,000 --> 00:02:28,000
+How will your JSP knows that this is not a simple text.
+
+58
+00:02:28,000 --> 00:02:30,000
+This is actually a variable.
+
+59
+00:02:30,000 --> 00:02:33,000
+And to do that we have to make sure that we put
+
+60
+00:02:33,000 --> 00:02:36,000
+that into JSP code.
+
+61
+00:02:36,000 --> 00:02:39,000
+So whenever you want to write a Java code inside JSP,
+
+62
+00:02:39,000 --> 00:02:40,000
+you have to open the angular bracket.
+
+63
+00:02:40,000 --> 00:02:42,000
+Then percentage, then percentage, angular bracket.
+
+64
+00:02:42,000 --> 00:02:43,000
+This is how we write the Java code.
+
+65
+00:02:43,000 --> 00:02:46,000
+Now in between you can write whatever code you want
+
+66
+00:02:46,000 --> 00:02:48,000
+and we don't want any code.
+
+67
+00:02:48,000 --> 00:02:52,000
+What we want is we have to say session get attribute.
+
+68
+00:02:52,000 --> 00:02:54,000
+And in bracket you have to mention the name
+
+69
+00:02:54,000 --> 00:02:55,000
+of a variable which is result here.
+
+70
+00:02:55,000 --> 00:02:57,000
+So we have to say session get attribute
+
+71
+00:02:57,000 --> 00:03:00,000
+and name of our variable
+
+72
+00:03:00,000 --> 00:03:02,000
+or the name of the data which result in this case.
+
+73
+00:03:02,000 --> 00:03:04,000
+Now the question arise, how will you get this session?
+
+74
+00:03:04,000 --> 00:03:05,000
+Object because in servlet
+
+75
+00:03:05,000 --> 00:03:08,000
+or here we are injecting the object right?
+
+76
+00:03:08,000 --> 00:03:10,000
+Now that's the beauty about JSP.
+
+77
+00:03:10,000 --> 00:03:12,000
+JSP gives you this object by default.
+
+78
+00:03:12,000 --> 00:03:14,000
+So you don't have to create this object.
+
+79
+00:03:14,000 --> 00:03:16,000
+JSP says, session is yours, request is yours.
+
+80
+00:03:16,000 --> 00:03:19,000
+You just use the object, it's available behind the scene.
+
+81
+00:03:19,000 --> 00:03:21,000
+So we got a session object, we are saying get attribute
+
+82
+00:03:21,000 --> 00:03:25,000
+and we are printing or we are getting the data of result.
+
+83
+00:03:25,000 --> 00:03:27,000
+And that's what you're going to display on the page.
+
+84
+00:03:27,000 --> 00:03:30,000
+And now let's see if this works, let's read on this.
+
+85
+00:03:30,000 --> 00:03:31,000
+Go back to your browser
+
+86
+00:03:31,000 --> 00:03:33,000
+and I will just refresh this
+
+87
+00:03:33,000 --> 00:03:38,000
+with a different value this time, let's say 7 and 88.
+
+88
+00:03:38,000 --> 00:03:41,000
+Let's click on submit and we got an error.
+
+89
+00:03:41,000 --> 00:03:44,000
+The error is internal servlet error 500.
+
+90
+00:03:44,000 --> 00:03:49,000
+Let's see what happened here, and I love errors.
+
+91
+00:03:49,000 --> 00:03:50,000
+Okay, one thing I forgot.
+
+92
+00:03:50,000 --> 00:03:53,000
+It's just that when you, I mean you can write the code here,
+
+93
+00:03:53,000 --> 00:03:55,000
+but then when you want the value of it,
+
+94
+00:03:55,000 --> 00:03:56,000
+you have to put the equal to as well
+
+95
+00:03:56,000 --> 00:03:58,000
+because we directly want to get this value
+
+96
+00:03:58,000 --> 00:04:00,000
+and print it on the page.
+
+97
+00:04:00,000 --> 00:04:03,000
+I forgot to put the equal to symbol
+
+98
+00:04:05,000 --> 00:04:07,000
+now I hope it'll work.
+
+99
+00:04:07,000 --> 00:04:12,000
+Let's go back to the browser, say refresh.
+
+100
+00:04:12,000 --> 00:04:14,000
+And you can see we got the value, which is 95.
+
+101
+00:04:14,000 --> 00:04:16,000
+So that's how basically you can get the value, okay?
+
+102
+00:04:16,000 --> 00:04:18,000
+So we can use a session object to get the value.
+
+103
+00:04:18,000 --> 00:04:20,000
+There's one way, there's another way
+
+104
+00:04:20,000 --> 00:04:22,000
+where you can use the JSTL way.
+
+105
+00:04:22,000 --> 00:04:25,000
+JSTL is basically a JSP standard library
+
+106
+00:04:25,000 --> 00:04:27,000
+or template library, which allows you
+
+107
+00:04:27,000 --> 00:04:30,000
+to directly use some certain tags,
+
+108
+00:04:30,000 --> 00:04:31,000
+which you can get the value.
+
+109
+00:04:31,000 --> 00:04:34,000
+So we can just put the currently packets here
+
+110
+00:04:34,000 --> 00:04:35,000
+and we can remove everything.
+
+111
+00:04:35,000 --> 00:04:37,000
+And you can simply put result.
+
+112
+00:04:37,000 --> 00:04:38,000
+So it'll directly use,
+
+113
+00:04:38,000 --> 00:04:41,000
+it'll directly search this session object,
+
+114
+00:04:41,000 --> 00:04:42,000
+request object to get your data.
+
+115
+00:04:42,000 --> 00:04:44,000
+And if you have, it'll directly fetch it.
+
+116
+00:04:44,000 --> 00:04:47,000
+The only thing is you have to put the dollar symbol as well
+
+117
+00:04:47,000 --> 00:04:50,000
+by specifying, hey, this is not a normal curly packet,
+
+118
+00:04:50,000 --> 00:04:51,000
+this is a JSTL.
+
+119
+00:04:51,000 --> 00:04:54,000
+So you have to use the dollar symbol and the current package
+
+120
+00:04:54,000 --> 00:04:55,000
+and then you have to set result.
+
+121
+00:04:55,000 --> 00:04:59,000
+Now if you run this, let's see if it is changing something,
+
+122
+00:04:59,000 --> 00:05:02,000
+let's refresh the servlet is not started yet.
+
+123
+00:05:02,000 --> 00:05:04,000
+Refresh and it works.
+
+124
+00:05:04,000 --> 00:05:07,000
+So basically you have both the ways you can use the normal
+
+125
+00:05:07,000 --> 00:05:11,000
+JSP syntax or you can use the JSTL.
+
+126
+00:05:11,000 --> 00:05:13,000
+But this is how basically you can pass the value
+
+127
+00:05:13,000 --> 00:05:16,000
+between the JSP or between the servlets.
+
+128
+00:05:16,000 --> 00:05:20,000
+Because ultimately JSP will get converted into servlets.
+
+129
+00:05:20,000 --> 00:05:22,000
+But one thing here, I mean this works,
+
+130
+00:05:22,000 --> 00:05:23,000
+but it doesn't look good.
+
+131
+00:05:23,000 --> 00:05:26,000
+We are working on spring framework, right?
+
+132
+00:05:26,000 --> 00:05:29,000
+This is okay, but can you just simplify this?
+
+133
+00:05:29,000 --> 00:05:32,000
+And that's the beauty about spring, right?
+
+134
+00:05:32,000 --> 00:05:34,000
+Can we simplify this code, of course we can.
+
+135
+00:05:34,000 --> 00:05:37,000
+And let's see that in the next video.
+

12 - Spring Boot Web/013 Source-Code.url

@@ -0,0 +1,2 @@
+[InternetShortcut]
+URL=https://github.com/navinreddy20/spring6-course/tree/f1161e151ea06b68810b3cae03005d4955a96a8b/6%20Spring%20%20Boot%20Web/5.13%20Display%20Data%20on%20Result%20Page

12 - Spring Boot Web/014 RequestParam_en.srt

@@ -0,0 +1,428 @@
+1
+00:00:00,000 --> 00:00:03,000
+(bright music)
+
+2
+00:00:03,000 --> 00:00:06,000
+-: So let's simplify this particular code here.
+
+3
+00:00:06,000 --> 00:00:07,000
+Now, as I mentioned before,
+
+4
+00:00:07,000 --> 00:00:10,000
+this is a sublet way of doing things, right?
+
+5
+00:00:10,000 --> 00:00:12,000
+Where you have to handle the request,
+
+6
+00:00:12,000 --> 00:00:13,000
+you have to create a sessional object,
+
+7
+00:00:13,000 --> 00:00:16,000
+but now in spring it'll make it bit easy.
+
+8
+00:00:16,000 --> 00:00:20,000
+How? See if we talk about this ad, which is a path, right?
+
+9
+00:00:20,000 --> 00:00:23,000
+So in the browser you can see it says there's an ad request
+
+10
+00:00:23,000 --> 00:00:28,000
+and then you are sending this two data in the URL itself.
+
+11
+00:00:28,000 --> 00:00:31,000
+So when you're sending this data here as a query parameter,
+
+12
+00:00:31,000 --> 00:00:33,000
+what we can also do is instead
+
+13
+00:00:33,000 --> 00:00:36,000
+of using this request object, we can delete this.
+
+14
+00:00:36,000 --> 00:00:40,000
+What if you can just take those two values in two variables?
+
+15
+00:00:40,000 --> 00:00:42,000
+Something like this,
+
+16
+00:00:42,000 --> 00:00:46,000
+You can simply say, int num1, int num2.
+
+17
+00:00:46,000 --> 00:00:49,000
+And what I'm expecting is it'll directly give
+
+18
+00:00:49,000 --> 00:00:51,000
+those values to these variables.
+
+19
+00:00:51,000 --> 00:00:53,000
+The question is, will it really work?
+
+20
+00:00:53,000 --> 00:00:55,000
+We'll do that in, we'll check that in some time,
+
+21
+00:00:55,000 --> 00:00:57,000
+but that also means that when you use
+
+22
+00:00:57,000 --> 00:00:59,000
+these two variables here,
+
+23
+00:00:59,000 --> 00:01:00,000
+then we don't have
+
+24
+00:01:00,000 --> 00:01:03,000
+to get the data like this from the request object.
+
+25
+00:01:03,000 --> 00:01:04,000
+Let's remember this.
+
+26
+00:01:04,000 --> 00:01:06,000
+So if we can get those data here,
+
+27
+00:01:06,000 --> 00:01:08,000
+we don't have to manually get the data, right?
+
+28
+00:01:08,000 --> 00:01:11,000
+We can simply say num1 + num2,
+
+29
+00:01:11,000 --> 00:01:13,000
+and then we can save that in result.
+
+30
+00:01:13,000 --> 00:01:15,000
+But will it work? Let's try.
+
+31
+00:01:15,000 --> 00:01:17,000
+So let me relaunch this application,
+
+32
+00:01:17,000 --> 00:01:19,000
+okay, application restarted.
+
+33
+00:01:19,000 --> 00:01:21,000
+Let's go back to the browser
+
+34
+00:01:21,000 --> 00:01:25,000
+and, okay, now this page, I want to go for the homepage
+
+35
+00:01:25,000 --> 00:01:26,000
+and here let me enter to values.
+
+36
+00:01:26,000 --> 00:01:28,000
+I will say 7 + 8.
+
+37
+00:01:28,000 --> 00:01:31,000
+If I click on submit, it works.
+
+38
+00:01:31,000 --> 00:01:32,000
+I mean that's weird, right?
+
+39
+00:01:32,000 --> 00:01:34,000
+Is this code really working?
+
+40
+00:01:34,000 --> 00:01:37,000
+What I would also do is let me just add a extra number here
+
+41
+00:01:37,000 --> 00:01:39,000
+just to verify.
+
+42
+00:01:39,000 --> 00:01:41,000
+If it works, then of course, right?
+
+43
+00:01:41,000 --> 00:01:44,000
+This is much better than the earlier code.
+
+44
+00:01:44,000 --> 00:01:46,000
+Let's go back, submit, and you can see we got 16.
+
+45
+00:01:46,000 --> 00:01:48,000
+So yes, this is working.
+
+46
+00:01:48,000 --> 00:01:49,000
+Now how it is working.
+
+47
+00:01:49,000 --> 00:01:52,000
+So what happens is when you send a request
+
+48
+00:01:52,000 --> 00:01:53,000
+for the ad method
+
+49
+00:01:53,000 --> 00:01:56,000
+and you're passing your those two query parameters
+
+50
+00:01:56,000 --> 00:02:00,000
+with the same name, they got the name num1 and num2,
+
+51
+00:02:00,000 --> 00:02:01,000
+and that's why it is working.
+
+52
+00:02:01,000 --> 00:02:03,000
+There is also one thing you can...
+
+53
+00:02:03,000 --> 00:02:05,000
+What if you want to have a different variable name.
+
+54
+00:02:05,000 --> 00:02:07,000
+Let's say you don't have num1 here we just have num.
+
+55
+00:02:07,000 --> 00:02:10,000
+And here also I'm using num, I'm not using num1 now.
+
+56
+00:02:10,000 --> 00:02:12,000
+Will this work with a different name?
+
+57
+00:02:12,000 --> 00:02:15,000
+Let's try and go back here, say refresh
+
+58
+00:02:15,000 --> 00:02:19,000
+and let's hit it with different values and say submit.
+
+59
+00:02:19,000 --> 00:02:22,000
+Okay, so you can see we got an error, which is 500.
+
+60
+00:02:22,000 --> 00:02:24,000
+Reason for this is it is not able
+
+61
+00:02:24,000 --> 00:02:26,000
+to match the variable name.
+
+62
+00:02:26,000 --> 00:02:29,000
+Let me just search for the reason.
+
+63
+00:02:29,000 --> 00:02:32,000
+It says optional int parameter num is present
+
+64
+00:02:32,000 --> 00:02:34,000
+but cannot be translated into a null value.
+
+65
+00:02:34,000 --> 00:02:36,000
+Okay, so this is optional, right?
+
+66
+00:02:36,000 --> 00:02:38,000
+Which is we are getting off this variable
+
+67
+00:02:38,000 --> 00:02:41,000
+and it's not matching with the data which we are sending.
+
+68
+00:02:41,000 --> 00:02:43,000
+So this by default it is null.
+
+69
+00:02:43,000 --> 00:02:45,000
+So we have to make sure it is num1.
+
+70
+00:02:45,000 --> 00:02:47,000
+But what if you don't want to give num1 there?
+
+71
+00:02:47,000 --> 00:02:49,000
+So in that case you can use
+
+72
+00:02:49,000 --> 00:02:52,000
+a annotation called RequestParam.
+
+73
+00:02:53,000 --> 00:02:56,000
+And in this bracket you can mention the actual variable
+
+74
+00:02:56,000 --> 00:02:59,000
+or actual name which is coming from the browser.
+
+75
+00:02:59,000 --> 00:03:01,000
+So in the URL, we are sending num1.
+
+76
+00:03:01,000 --> 00:03:03,000
+So what we are saying is
+
+77
+00:03:03,000 --> 00:03:05,000
+whatever data you are getting in num1,
+
+78
+00:03:05,000 --> 00:03:08,000
+just assign to that variable called num
+
+79
+00:03:08,000 --> 00:03:09,000
+and that's how you can do it.
+
+80
+00:03:09,000 --> 00:03:12,000
+So again, it is optional if you have a same variable name,
+
+81
+00:03:12,000 --> 00:03:14,000
+but it's better to write it
+
+82
+00:03:14,000 --> 00:03:16,000
+so it go back to the same variable.
+
+83
+00:03:16,000 --> 00:03:19,000
+And same you can apply here.
+
+84
+00:03:19,000 --> 00:03:21,000
+So we can say request, not request mapping.
+
+85
+00:03:21,000 --> 00:03:22,000
+RequestParam.
+
+86
+00:03:27,000 --> 00:03:29,000
+And here we can say this is for num2.
+
+87
+00:03:30,000 --> 00:03:32,000
+And even if you say they are same,
+
+88
+00:03:32,000 --> 00:03:34,000
+you can skip this name here
+
+89
+00:03:34,000 --> 00:03:37,000
+and you can keep it just RequestParam and that works.
+
+90
+00:03:37,000 --> 00:03:40,000
+So basically if you can directly get the value from the URL,
+
+91
+00:03:40,000 --> 00:03:44,000
+you don't have to use the CDP server request object.
+
+92
+00:03:44,000 --> 00:03:46,000
+And that's how basically you work with Param.
+
+93
+00:03:46,000 --> 00:03:48,000
+Let's again, for the last time,
+
+94
+00:03:48,000 --> 00:03:50,000
+let's run this for this particular video.
+
+95
+00:03:50,000 --> 00:03:52,000
+So let's go back to the browser.
+
+96
+00:03:52,000 --> 00:03:56,000
+Let's refresh this, of course with different values
+
+97
+00:03:56,000 --> 00:03:58,000
+and it works, okay?
+
+98
+00:03:58,000 --> 00:04:00,000
+So if we got this extra one
+
+99
+00:04:00,000 --> 00:04:02,000
+because of this extra edition we are doing,
+
+100
+00:04:02,000 --> 00:04:04,000
+but yeah, that's how you basically use RequestParam
+
+101
+00:04:04,000 --> 00:04:08,000
+so that you can simplify your code much more.
+
+102
+00:04:08,000 --> 00:04:09,000
+Now what else?
+
+103
+00:04:09,000 --> 00:04:12,000
+See we have removed the CDP request object, right?
+
+104
+00:04:12,000 --> 00:04:14,000
+Or the CDP server request object.
+
+105
+00:04:14,000 --> 00:04:15,000
+How about this sessional object?
+
+106
+00:04:15,000 --> 00:04:17,000
+I don't want to work with sessional object.
+
+107
+00:04:17,000 --> 00:04:21,000
+How can we remove that? So let's see that in the next video.
+

12 - Spring Boot Web/014 Source-Code.url

@@ -0,0 +1,2 @@
+[InternetShortcut]
+URL=https://github.com/navinreddy20/spring6-course/tree/f1161e151ea06b68810b3cae03005d4955a96a8b/6%20Spring%20%20Boot%20Web/5.14%20RequestParam

12 - Spring Boot Web/015 Model Object_en.srt

@@ -0,0 +1,396 @@
+1
+00:00:00,000 --> 00:00:03,000
+(bright music)
+
+2
+00:00:03,000 --> 00:00:04,000
+-: So now it's time to get rid
+
+3
+00:00:04,000 --> 00:00:07,000
+of this HTTP session object here.
+
+4
+00:00:07,000 --> 00:00:08,000
+So before we do that, let's verify
+
+5
+00:00:08,000 --> 00:00:10,000
+what we are doing in results.
+
+6
+00:00:10,000 --> 00:00:13,000
+So basically here we are printing the result is,
+
+7
+00:00:13,000 --> 00:00:15,000
+and then we have used JSTL here just
+
+8
+00:00:15,000 --> 00:00:18,000
+to fetch the value of that particular data,
+
+9
+00:00:18,000 --> 00:00:20,000
+which is result in this case.
+
+10
+00:00:20,000 --> 00:00:22,000
+So when we talked about MVC, we had a model view controller,
+
+11
+00:00:22,000 --> 00:00:24,000
+right, where controller is responsible
+
+12
+00:00:24,000 --> 00:00:26,000
+to accept the user request, right?
+
+13
+00:00:26,000 --> 00:00:28,000
+So we've got a controller here
+
+14
+00:00:28,000 --> 00:00:31,000
+and then we have a view which is going to decline.
+
+15
+00:00:31,000 --> 00:00:33,000
+So we have talked about the controller and the view.
+
+16
+00:00:33,000 --> 00:00:35,000
+What about that data?
+
+17
+00:00:35,000 --> 00:00:37,000
+Remember we have talked about how do you transfer data
+
+18
+00:00:37,000 --> 00:00:41,000
+between the controller and the view?
+
+19
+00:00:41,000 --> 00:00:43,000
+So basically we have to use an object
+
+20
+00:00:43,000 --> 00:00:45,000
+and that is your model object.
+
+21
+00:00:45,000 --> 00:00:46,000
+And we are not using it here.
+
+22
+00:00:46,000 --> 00:00:48,000
+So instead of using session, I want to use
+
+23
+00:00:48,000 --> 00:00:51,000
+that model object and how do we use that?
+
+24
+00:00:51,000 --> 00:00:53,000
+As the name suggest, we can simply say, model,
+
+25
+00:00:53,000 --> 00:00:57,000
+let's input the package for this and say model.
+
+26
+00:00:57,000 --> 00:00:59,000
+That's it. You just get this model.
+
+27
+00:00:59,000 --> 00:01:02,000
+And now with this model object, instead
+
+28
+00:01:02,000 --> 00:01:04,000
+of using session, let me delete that.
+
+29
+00:01:04,000 --> 00:01:07,000
+I can simply say model.addAttribute.
+
+30
+00:01:08,000 --> 00:01:10,000
+So instead of said attribute, we have add attribute
+
+31
+00:01:10,000 --> 00:01:13,000
+because we can add multiple attributes, not just one.
+
+32
+00:01:13,000 --> 00:01:15,000
+And then we can give a name
+
+33
+00:01:15,000 --> 00:01:16,000
+the same way we have done before.
+
+34
+00:01:16,000 --> 00:01:19,000
+We can say result and we can say result.
+
+35
+00:01:19,000 --> 00:01:21,000
+Okay, and what is this model?
+
+36
+00:01:21,000 --> 00:01:23,000
+So basically model is interface,
+
+37
+00:01:23,000 --> 00:01:27,000
+which was introduced in 2.5 version of Spring.
+
+38
+00:01:27,000 --> 00:01:32,000
+It is basically used to transfer data between the things.
+
+39
+00:01:32,000 --> 00:01:35,000
+I just want to make sure I've imported the right package.
+
+40
+00:01:35,000 --> 00:01:37,000
+Yeah, so if you want to transfer between controller
+
+41
+00:01:37,000 --> 00:01:40,000
+and the JSP, we have to use something called model here.
+
+42
+00:01:40,000 --> 00:01:43,000
+Now, once we've got model, we just have to add attribute,
+
+43
+00:01:43,000 --> 00:01:45,000
+and let's see if this works.
+
+44
+00:01:45,000 --> 00:01:46,000
+Let's restart the application.
+
+45
+00:01:46,000 --> 00:01:47,000
+So now we are not using a HTTP session.
+
+46
+00:01:47,000 --> 00:01:50,000
+We are basically using a model.
+
+47
+00:01:50,000 --> 00:01:55,000
+And if you go back to your browser, let's go back here,
+
+48
+00:01:55,000 --> 00:01:56,000
+refresh
+
+49
+00:01:57,000 --> 00:02:02,000
+and say some big number, enter, and you've got the output.
+
+50
+00:02:02,000 --> 00:02:05,000
+Doesn't matter what the output is, but we got the output.
+
+51
+00:02:05,000 --> 00:02:08,000
+So that's how basically your model object works.
+
+52
+00:02:08,000 --> 00:02:09,000
+So instead of using SGP session, we are using model now.
+
+53
+00:02:12,000 --> 00:02:16,000
+Okay, so we have get, we got rid of the the request object.
+
+54
+00:02:16,000 --> 00:02:18,000
+We got rid of the HTTP session.
+
+55
+00:02:18,000 --> 00:02:20,000
+Now, this is how basically you build
+
+56
+00:02:21,000 --> 00:02:22,000
+application using spring NVC or spring.
+
+57
+00:02:22,000 --> 00:02:24,000
+Spring Boot.
+
+58
+00:02:24,000 --> 00:02:27,000
+You can say, okay, but also I want to change one more thing.
+
+59
+00:02:27,000 --> 00:02:28,000
+I know you'll be saying,
+
+60
+00:02:28,000 --> 00:02:30,000
+Hey, how many things you're changing?
+
+61
+00:02:30,000 --> 00:02:33,000
+Okay, let, let me do one last, I hope.
+
+62
+00:02:33,000 --> 00:02:35,000
+I just want
+
+63
+00:02:35,000 --> 00:02:36,000
+to get rid of this JSP page.
+
+64
+00:02:36,000 --> 00:02:39,000
+I mean not JSP page, but .JSP. I mean, think about this.
+
+65
+00:02:39,000 --> 00:02:41,000
+Remember when we talked about MVC, I said
+
+66
+00:02:41,000 --> 00:02:44,000
+for the view we have multiple options.
+
+67
+00:02:44,000 --> 00:02:49,000
+We got JSP, we got free marker, we got theme leaf.
+
+68
+00:02:49,000 --> 00:02:50,000
+So we have so many options, right?
+
+69
+00:02:50,000 --> 00:02:55,000
+And let's say one day I decided to move from let's say, JSP
+
+70
+00:02:55,000 --> 00:02:56,000
+to theme leaf.
+
+71
+00:02:56,000 --> 00:03:00,000
+In that case you will have to go to each controller
+
+72
+00:03:00,000 --> 00:03:02,000
+and check where, where are we using this
+
+73
+00:03:02,000 --> 00:03:04,000
+dot JSP extension.
+
+74
+00:03:04,000 --> 00:03:07,000
+So if you can get rid of this, will it still work?
+
+75
+00:03:07,000 --> 00:03:10,000
+Of course, we have to change both the side.
+
+76
+00:03:10,000 --> 00:03:13,000
+Nowhere. I want to mention the extension.
+
+77
+00:03:13,000 --> 00:03:14,000
+That's one.
+
+78
+00:03:14,000 --> 00:03:18,000
+Next, maybe I want to keep my files,
+
+79
+00:03:18,000 --> 00:03:21,000
+the web files, not in the web app folder,
+
+80
+00:03:21,000 --> 00:03:22,000
+but it's, but somewhere else.
+
+81
+00:03:22,000 --> 00:03:24,000
+Maybe I, I have a new view folder here.
+
+82
+00:03:24,000 --> 00:03:25,000
+So I will just right click here
+
+83
+00:03:25,000 --> 00:03:30,000
+and say I have a folder called views
+
+84
+00:03:30,000 --> 00:03:33,000
+and I want to move this things
+
+85
+00:03:34,000 --> 00:03:35,000
+inside this.
+
+86
+00:03:36,000 --> 00:03:37,000
+Now question arise.
+
+87
+00:03:37,000 --> 00:03:39,000
+After making these changes, will it work?
+
+88
+00:03:39,000 --> 00:03:40,000
+Let's try.
+
+89
+00:03:40,000 --> 00:03:42,000
+So I'll restart the application
+
+90
+00:03:42,000 --> 00:03:43,000
+and if I go back to the browser now,
+
+91
+00:03:43,000 --> 00:03:46,000
+let's say refresh the homepage.
+
+92
+00:03:46,000 --> 00:03:47,000
+And even the homepage,
+
+93
+00:03:47,000 --> 00:03:49,000
+you can see the url, I'm calling the homepage.
+
+94
+00:03:49,000 --> 00:03:51,000
+It's not able to find the homepage.
+
+95
+00:03:51,000 --> 00:03:53,000
+Why? The homepage is there.
+
+96
+00:03:53,000 --> 00:03:55,000
+It's just that it in different folder plus
+
+97
+00:03:55,000 --> 00:03:58,000
+we are not even specifying the extension.
+
+98
+00:03:58,000 --> 00:04:01,000
+So how do we solve this problem?
+
+99
+00:04:01,000 --> 00:04:03,000
+Let's talk about that in the next video.
+

12 - Spring Boot Web/015 Source-Code.url

@@ -0,0 +1,2 @@
+[InternetShortcut]
+URL=https://github.com/navinreddy20/spring6-course/tree/f1161e151ea06b68810b3cae03005d4955a96a8b/6%20Spring%20%20Boot%20Web/5.15%20Model%20Object

12 - Spring Boot Web/016 Setting Prefix and Suffix_en.srt

@@ -0,0 +1,340 @@
+1
+00:00:00,000 --> 00:00:03,000
+(light music)
+
+2
+00:00:03,000 --> 00:00:04,000
+-: Okay, so let's solve this problem.
+
+3
+00:00:04,000 --> 00:00:07,000
+So basically now, our views, which are the jsp files,
+
+4
+00:00:07,000 --> 00:00:09,000
+are in other folder.
+
+5
+00:00:09,000 --> 00:00:12,000
+Additionally, we have changed the name of the view
+
+6
+00:00:12,000 --> 00:00:15,000
+directly with the name of the view, not with the extension.
+
+7
+00:00:15,000 --> 00:00:17,000
+So the question arise, how would you solve it?
+
+8
+00:00:17,000 --> 00:00:20,000
+The thing is, when you talk about your spring framework,
+
+9
+00:00:20,000 --> 00:00:23,000
+it also has a view resolver.
+
+10
+00:00:23,000 --> 00:00:24,000
+So basically, behind the scenes,
+
+11
+00:00:24,000 --> 00:00:27,000
+whenever you return a particular jsp file or something,
+
+12
+00:00:27,000 --> 00:00:29,000
+when you return a name here,
+
+13
+00:00:29,000 --> 00:00:31,000
+and if you see we are running a string,
+
+14
+00:00:31,000 --> 00:00:33,000
+so someone has to map it, right?
+
+15
+00:00:33,000 --> 00:00:36,000
+So there's also a component which helps you to resolve this
+
+16
+00:00:36,000 --> 00:00:39,000
+and that is called a view resolver.
+
+17
+00:00:39,000 --> 00:00:42,000
+So when you say, "Hey, I'm returning result here."
+
+18
+00:00:42,000 --> 00:00:44,000
+Now view resolver has no idea,
+
+19
+00:00:44,000 --> 00:00:46,000
+first of all, where this file is,
+
+20
+00:00:46,000 --> 00:00:48,000
+and next what is the extension.
+
+21
+00:00:48,000 --> 00:00:50,000
+So we can talk to view resolver by saying,
+
+22
+00:00:50,000 --> 00:00:51,000
+"Hey, don't worry,
+
+23
+00:00:51,000 --> 00:00:53,000
+let me tell you where will you find it
+
+24
+00:00:53,000 --> 00:00:55,000
+and what is the extension."
+
+25
+00:00:55,000 --> 00:00:57,000
+And the way you can do that,
+
+26
+00:00:57,000 --> 00:00:58,000
+is with the help of a property file.
+
+27
+00:00:58,000 --> 00:01:00,000
+Of course, we are conferring something, right?
+
+28
+00:01:00,000 --> 00:01:03,000
+And when you configure your spring framework,
+
+29
+00:01:03,000 --> 00:01:05,000
+spring boot basically gives you this amazing file
+
+30
+00:01:05,000 --> 00:01:07,000
+called application of properties.
+
+31
+00:01:07,000 --> 00:01:10,000
+This is where you can mention the properties,
+
+32
+00:01:10,000 --> 00:01:12,000
+but we don't know which property, right?
+
+33
+00:01:12,000 --> 00:01:15,000
+So for that, again, you don't have to buy hard disk,
+
+34
+00:01:15,000 --> 00:01:16,000
+the moment, the more you work,
+
+35
+00:01:16,000 --> 00:01:19,000
+the more you will remember the property names.
+
+36
+00:01:19,000 --> 00:01:21,000
+But if you search for spring application properties,
+
+37
+00:01:21,000 --> 00:01:24,000
+the first link here, the common application properties,
+
+38
+00:01:24,000 --> 00:01:27,000
+if you go there, there are so many properties you can set
+
+39
+00:01:27,000 --> 00:01:29,000
+to configure your application, okay?
+
+40
+00:01:29,000 --> 00:01:30,000
+Don't get stressed with this.
+
+41
+00:01:30,000 --> 00:01:33,000
+It's not, we don't have to remember everything.
+
+42
+00:01:33,000 --> 00:01:36,000
+Few of them we will be using most of the time.
+
+43
+00:01:36,000 --> 00:01:38,000
+And even if you don't remember anything,
+
+44
+00:01:38,000 --> 00:01:39,000
+you can just Google it.
+
+45
+00:01:39,000 --> 00:01:40,000
+Stackoverflow is there.
+
+46
+00:01:40,000 --> 00:01:41,000
+AI is there.
+
+47
+00:01:41,000 --> 00:01:44,000
+AI tools are available, they will give you the exact name.
+
+48
+00:01:44,000 --> 00:01:45,000
+But here what I will do
+
+49
+00:01:45,000 --> 00:01:48,000
+is I will search for the MVC property.
+
+50
+00:01:48,000 --> 00:01:51,000
+And in this MVC, we have to set the location
+
+51
+00:01:51,000 --> 00:01:53,000
+and we have to set the extension, right?
+
+52
+00:01:53,000 --> 00:01:56,000
+So the location is your prefix.
+
+53
+00:01:56,000 --> 00:01:59,000
+So the name, result, so prefix is the views
+
+54
+00:01:59,000 --> 00:02:03,000
+and the postfix is the extension, which is .jsp, okay?
+
+55
+00:02:03,000 --> 00:02:05,000
+And then we can search
+
+56
+00:02:05,000 --> 00:02:08,000
+for something called prefix and postfix.
+
+57
+00:02:08,000 --> 00:02:10,000
+So if you can see, not prefix and postfix,
+
+58
+00:02:10,000 --> 00:02:12,000
+prefix and suffix.
+
+59
+00:02:12,000 --> 00:02:14,000
+These are the properties we have to mention, okay?
+
+60
+00:02:14,000 --> 00:02:16,000
+So example, if you set the prefix,
+
+61
+00:02:16,000 --> 00:02:18,000
+let me just copy this.
+
+62
+00:02:18,000 --> 00:02:22,000
+So prefix, you have to set slash, views, slash,
+
+63
+00:02:22,000 --> 00:02:24,000
+that's the folder name.
+
+64
+00:02:24,000 --> 00:02:26,000
+And then we have to set this suffix as well.
+
+65
+00:02:26,000 --> 00:02:29,000
+And this is your extension, which is .jsp, that's it.
+
+66
+00:02:29,000 --> 00:02:31,000
+This, you have to mention these two things.
+
+67
+00:02:31,000 --> 00:02:32,000
+So what we are doing is we are specifying the prefix
+
+68
+00:02:32,000 --> 00:02:36,000
+and we are specifying the suffix, which is the extension.
+
+69
+00:02:36,000 --> 00:02:38,000
+Let's restart the application now.
+
+70
+00:02:38,000 --> 00:02:39,000
+I hope this will work.
+
+71
+00:02:39,000 --> 00:02:41,000
+Let's go back to your browser.
+
+72
+00:02:41,000 --> 00:02:44,000
+This page, let me just close the property files.
+
+73
+00:02:44,000 --> 00:02:49,000
+And now, if I go to localhost:8080,
+
+74
+00:02:50,000 --> 00:02:52,000
+okay, it's not,
+
+75
+00:02:52,000 --> 00:02:54,000
+it's not running the CSS.
+
+76
+00:02:54,000 --> 00:02:56,000
+Let me reload my entire IntelliJ Idea.
+
+77
+00:02:56,000 --> 00:02:57,000
+Let's run this now.
+
+78
+00:02:57,000 --> 00:02:59,000
+Okay, go back to your browser, reload.
+
+79
+00:02:59,000 --> 00:03:02,000
+Okay, some issue with the CSS, we will resolve that later.
+
+80
+00:03:02,000 --> 00:03:04,000
+And let me just try the values.
+
+81
+00:03:04,000 --> 00:03:05,000
+Click on submit.
+
+82
+00:03:05,000 --> 00:03:06,000
+And you can see it worked.
+
+83
+00:03:06,000 --> 00:03:09,000
+We got result is 13.
+
+84
+00:03:09,000 --> 00:03:10,000
+So basically it was able to find the view,
+
+85
+00:03:10,000 --> 00:03:13,000
+it was able to find the JSP as well.
+

12 - Spring Boot Web/016 Source-Code.url

@@ -0,0 +1,2 @@
+[InternetShortcut]
+URL=https://github.com/navinreddy20/spring6-course/tree/f1161e151ea06b68810b3cae03005d4955a96a8b/6%20Spring%20%20Boot%20Web/5.16%20Setting%20Prefix%20and%20Suffix

12 - Spring Boot Web/017 ModelAndView_en.srt

@@ -0,0 +1,456 @@
+1
+00:00:00,000 --> 00:00:03,000
+(gentle music)
+
+2
+00:00:03,000 --> 00:00:06,000
+-: Now in this video, we'll talk about ModelAndView.
+
+3
+00:00:06,000 --> 00:00:08,000
+So basically we have talked about Model before.
+
+4
+00:00:08,000 --> 00:00:11,000
+So if you want to pass data between the pages,
+
+5
+00:00:11,000 --> 00:00:13,000
+you can use a Model object.
+
+6
+00:00:13,000 --> 00:00:15,000
+So what we are doing till now is we got a Model object.
+
+7
+00:00:15,000 --> 00:00:17,000
+We are adding this data, which is "result",
+
+8
+00:00:17,000 --> 00:00:20,000
+and then this data is going to the .jsp page,
+
+9
+00:00:20,000 --> 00:00:21,000
+which you have mentioned here.
+
+10
+00:00:21,000 --> 00:00:23,000
+Okay, so before we talk about the ModelAndView,
+
+11
+00:00:23,000 --> 00:00:25,000
+because that View is important,
+
+12
+00:00:25,000 --> 00:00:27,000
+and the view is not working the way we want it.
+
+13
+00:00:27,000 --> 00:00:31,000
+So what I did is basically when I was moving the .jsp files,
+
+14
+00:00:31,000 --> 00:00:33,000
+I've also moved the .css file.
+
+15
+00:00:33,000 --> 00:00:35,000
+Now, .css is a public file, right?
+
+16
+00:00:35,000 --> 00:00:38,000
+Basically it is only for the styling purpose.
+
+17
+00:00:38,000 --> 00:00:42,000
+So you can put the .css file inside the webapp.
+
+18
+00:00:42,000 --> 00:00:43,000
+So, what?
+
+19
+00:00:43,000 --> 00:00:46,000
+You have to move a .jsp but not the static files.
+
+20
+00:00:46,000 --> 00:00:47,000
+So you can put the static files here
+
+21
+00:00:47,000 --> 00:00:51,000
+and then this should resolve the problem.
+
+22
+00:00:51,000 --> 00:00:53,000
+So let's go back to my browser
+
+23
+00:00:53,000 --> 00:00:55,000
+and you can see it I've refreshed.
+
+24
+00:00:55,000 --> 00:00:57,000
+And if I type two numbers,
+
+25
+00:00:57,000 --> 00:00:59,000
+now it is able to basically load this .css, right?
+
+26
+00:00:59,000 --> 00:01:01,000
+So that was the issue last time.
+
+27
+00:01:01,000 --> 00:01:06,000
+Also, you can also put this .css file in this static folder.
+
+28
+00:01:06,000 --> 00:01:09,000
+Now, static is a folder which you can see in the resources.
+
+29
+00:01:09,000 --> 00:01:10,000
+So we have a static folder, which will be there.
+
+30
+00:01:10,000 --> 00:01:13,000
+And if you want to put any static resources like images,
+
+31
+00:01:13,000 --> 00:01:16,000
+.css files, you can put that here.
+
+32
+00:01:16,000 --> 00:01:17,000
+Okay? So you have a choice.
+
+33
+00:01:17,000 --> 00:01:21,000
+You can either put that in the static file or in the webapp.
+
+34
+00:01:21,000 --> 00:01:23,000
+It makes sense to put that in static file
+
+35
+00:01:23,000 --> 00:01:26,000
+is because all the styling and static content
+
+36
+00:01:26,000 --> 00:01:28,000
+will be there in the static folder.
+
+37
+00:01:28,000 --> 00:01:30,000
+In the View, you will be having your .jsp.
+
+38
+00:01:30,000 --> 00:01:33,000
+It's more about structuring your project, right?
+
+39
+00:01:33,000 --> 00:01:36,000
+So if I refresh or restart the application once again,
+
+40
+00:01:36,000 --> 00:01:37,000
+let's see if that works.
+
+41
+00:01:37,000 --> 00:01:39,000
+Let's go back to the browser and refresh.
+
+42
+00:01:39,000 --> 00:01:40,000
+Okay, no problem.
+
+43
+00:01:40,000 --> 00:01:42,000
+You can see we are able to load the .css.
+
+44
+00:01:42,000 --> 00:01:44,000
+Okay, now let's talk about ModelAndView.
+
+45
+00:01:44,000 --> 00:01:47,000
+So when we talk about Model, it's only for data, right?
+
+46
+00:01:47,000 --> 00:01:50,000
+So we are using Model here to add the data
+
+47
+00:01:50,000 --> 00:01:54,000
+and also we are specifying a View name in the result.
+
+48
+00:01:54,000 --> 00:01:57,000
+What if you can put that review name in the object itself?
+
+49
+00:01:57,000 --> 00:02:00,000
+What I'm saying is, instead of using Model,
+
+50
+00:02:00,000 --> 00:02:01,000
+if you can use ModelAndView.
+
+51
+00:02:03,000 --> 00:02:04,000
+Which is this.
+
+52
+00:02:04,000 --> 00:02:06,000
+Instead of saying Model, I will say .mv.
+
+53
+00:02:06,000 --> 00:02:08,000
+.mv represents ModelAndView.
+
+54
+00:02:08,000 --> 00:02:12,000
+And with this ModelAndView object, I can add the attribute.
+
+55
+00:02:12,000 --> 00:02:14,000
+Okay, so we have a different name.
+
+56
+00:02:15,000 --> 00:02:18,000
+So I will say "addObject"
+
+57
+00:02:18,000 --> 00:02:21,000
+and then we can say the object is "result".
+
+58
+00:02:21,000 --> 00:02:23,000
+And then I can pass the data, which is "result",
+
+59
+00:02:23,000 --> 00:02:25,000
+that's done.
+
+60
+00:02:25,000 --> 00:02:28,000
+Okay, but then what about the return here?
+
+61
+00:02:28,000 --> 00:02:31,000
+So, of course we can still work with this, it will work.
+
+62
+00:02:31,000 --> 00:02:35,000
+But the best option is, instead of returning a name,
+
+63
+00:02:35,000 --> 00:02:36,000
+return the .mv object
+
+64
+00:02:36,000 --> 00:02:39,000
+because the ViewResolver will look at .mv object
+
+65
+00:02:39,000 --> 00:02:42,000
+and it will have two things: the data, as well as the View.
+
+66
+00:02:42,000 --> 00:02:44,000
+It makes much more sense now, right?
+
+67
+00:02:44,000 --> 00:02:46,000
+Because you are returning only one thing, not two.
+
+68
+00:02:46,000 --> 00:02:48,000
+Initially, you are returning the Model object
+
+69
+00:02:48,000 --> 00:02:50,000
+and also the View name.
+
+70
+00:02:50,000 --> 00:02:53,000
+But now we are returning only one object.
+
+71
+00:02:53,000 --> 00:02:54,000
+Now, since we are changing it here .mv,
+
+72
+00:02:54,000 --> 00:02:57,000
+we have to also make sure that you change it here
+
+73
+00:02:57,000 --> 00:03:02,000
+by saying we are returning a ModelAndView object
+
+74
+00:03:02,000 --> 00:03:02,000
+and that's done.
+
+75
+00:03:02,000 --> 00:03:05,000
+So okay, we got some angular bracket there.
+
+76
+00:03:05,000 --> 00:03:06,000
+And this should work.
+
+77
+00:03:06,000 --> 00:03:07,000
+Let's try.
+
+78
+00:03:07,000 --> 00:03:10,000
+Let's refresh this or restart the application.
+
+79
+00:03:10,000 --> 00:03:12,000
+Let's go back to our browser.
+
+80
+00:03:12,000 --> 00:03:14,000
+And if I refresh the page,
+
+81
+00:03:14,000 --> 00:03:16,000
+you can see there's no problem on the homepage.
+
+82
+00:03:16,000 --> 00:03:17,000
+But if I add the values,
+
+83
+00:03:17,000 --> 00:03:20,000
+and if I say submit, you can see we got an error,
+
+84
+00:03:20,000 --> 00:03:21,000
+which is 404.
+
+85
+00:03:21,000 --> 00:03:23,000
+So basically, it is not able to find the "result" page.
+
+86
+00:03:23,000 --> 00:03:24,000
+You know why?
+
+87
+00:03:24,000 --> 00:03:25,000
+Because nowhere,
+
+88
+00:03:25,000 --> 00:03:28,000
+we are saying that we have to call a "result" page.
+
+89
+00:03:28,000 --> 00:03:31,000
+So that means when you add the data,
+
+90
+00:03:31,000 --> 00:03:33,000
+you have to also set the ViewName.
+
+91
+00:03:34,000 --> 00:03:36,000
+So you have to mention the ViewName as "result".
+
+92
+00:03:36,000 --> 00:03:38,000
+Now it should work.
+
+93
+00:03:38,000 --> 00:03:41,000
+Let's restart the application and go back to the browser.
+
+94
+00:03:41,000 --> 00:03:43,000
+Let's go to the homepage first
+
+95
+00:03:45,000 --> 00:03:47,000
+and let's say 6 and 7.
+
+96
+00:03:47,000 --> 00:03:48,000
+Submit.
+
+97
+00:03:48,000 --> 00:03:49,000
+And you can see it works.
+
+98
+00:03:49,000 --> 00:03:51,000
+So basically you can use a Model object
+
+99
+00:03:51,000 --> 00:03:53,000
+if you just want to work with Data,
+
+100
+00:03:53,000 --> 00:03:55,000
+but if you want to return the ViewName as well,
+
+101
+00:03:55,000 --> 00:03:58,000
+ModelAndView makes much more sense.
+
+102
+00:03:58,000 --> 00:04:00,000
+So yeah, that's it about ModelAndView
+
+103
+00:04:00,000 --> 00:04:03,000
+where you can add the object and not just one object.
+
+104
+00:04:03,000 --> 00:04:05,000
+You can add multiple objects
+
+105
+00:04:05,000 --> 00:04:07,000
+and you can set the ViewName as well.
+
+106
+00:04:07,000 --> 00:04:09,000
+And this is how basically you build an application.
+
+107
+00:04:09,000 --> 00:04:12,000
+You can do the same thing here.
+
+108
+00:04:12,000 --> 00:04:13,000
+Instead of saying String,
+
+109
+00:04:13,000 --> 00:04:15,000
+we should also return ModelAndView here.
+
+110
+00:04:15,000 --> 00:04:17,000
+But again, that's something you can decide on,
+
+111
+00:04:17,000 --> 00:04:18,000
+which one to use.
+
+112
+00:04:18,000 --> 00:04:19,000
+But you have both the options.
+
+113
+00:04:19,000 --> 00:04:22,000
+You can use String or you can use,
+
+114
+00:04:22,000 --> 00:04:24,000
+you can return the ModelAndView object.
+

12 - Spring Boot Web/017 Source-Code.url

@@ -0,0 +1,2 @@
+[InternetShortcut]
+URL=https://github.com/navinreddy20/spring6-course/tree/f1161e151ea06b68810b3cae03005d4955a96a8b/6%20Spring%20%20Boot%20Web/5.17%20ModelAndView

12 - Spring Boot Web/018 Need for ModelAttribute_en.srt

@@ -0,0 +1,748 @@
+1
+00:00:00,000 --> 00:00:03,000
+(upbeat music)
+
+2
+00:00:03,000 --> 00:00:06,000
+-: So we are happy with whatever we have learned till now.
+
+3
+00:00:06,000 --> 00:00:09,000
+Basically we have talked about model, object,
+
+4
+00:00:09,000 --> 00:00:10,000
+model and view.
+
+5
+00:00:10,000 --> 00:00:13,000
+There is one more called model attribute.
+
+6
+00:00:13,000 --> 00:00:16,000
+So let's understand why do we need a model attribute here.
+
+7
+00:00:16,000 --> 00:00:20,000
+So what I will do for that is I will go back to my index.jsp
+
+8
+00:00:20,000 --> 00:00:23,000
+and what we are doing here is to add two numbers.
+
+9
+00:00:23,000 --> 00:00:25,000
+Now basically if I go to my output page,
+
+10
+00:00:25,000 --> 00:00:26,000
+and if I go to the homepage,
+
+11
+00:00:26,000 --> 00:00:29,000
+basically you can see we are saying, "Hey, you know,
+
+12
+00:00:29,000 --> 00:00:31,000
+enter two numbers and we will add them".
+
+13
+00:00:31,000 --> 00:00:32,000
+And that's what we are doing.
+
+14
+00:00:32,000 --> 00:00:36,000
+But let's say you are not just want to add two numbers.
+
+15
+00:00:36,000 --> 00:00:39,000
+Let's maybe you want to send some data to the server so
+
+16
+00:00:39,000 --> 00:00:41,000
+that we can store that in database.
+
+17
+00:00:41,000 --> 00:00:43,000
+So now let's say you have an entity.
+
+18
+00:00:43,000 --> 00:00:46,000
+Now when you say entity, it means you are representing some
+
+19
+00:00:46,000 --> 00:00:50,000
+real life entities like laptop or a house or a office
+
+20
+00:00:50,000 --> 00:00:53,000
+or a factory or a mobile phone.
+
+21
+00:00:53,000 --> 00:00:55,000
+Now all this are entity, even humans.
+
+22
+00:00:55,000 --> 00:00:57,000
+When you say you are a student, you're a teacher,
+
+23
+00:00:57,000 --> 00:00:59,000
+you're an engineer, you are a doctor,
+
+24
+00:00:59,000 --> 00:01:02,000
+you are basically representing an entity
+
+25
+00:01:02,000 --> 00:01:04,000
+and then you, maybe you want
+
+26
+00:01:04,000 --> 00:01:06,000
+to show this entity in a database.
+
+27
+00:01:06,000 --> 00:01:09,000
+But again, we are not talking about database as of now,
+
+28
+00:01:09,000 --> 00:01:12,000
+but let's say from this page, I want to send a data
+
+29
+00:01:12,000 --> 00:01:16,000
+regarding an entity and then I want to directly accept
+
+30
+00:01:16,000 --> 00:01:19,000
+that entity as an object on the server side.
+
+31
+00:01:19,000 --> 00:01:21,000
+Okay, I know a lot of things to imagine.
+
+32
+00:01:21,000 --> 00:01:24,000
+Let's go step by step, what I'm talking about is,
+
+33
+00:01:24,000 --> 00:01:26,000
+let's say we have a alien class.
+
+34
+00:01:26,000 --> 00:01:28,000
+Now, when I say alien for this context,
+
+35
+00:01:28,000 --> 00:01:30,000
+alien simply means programmers.
+
+36
+00:01:30,000 --> 00:01:34,000
+Okay, so I refer programmers as aliens and why?
+
+37
+00:01:34,000 --> 00:01:36,000
+If you want to know, just go to YouTube
+
+38
+00:01:36,000 --> 00:01:39,000
+and search for why I call Alien.
+
+39
+00:01:39,000 --> 00:01:42,000
+So you will get the idea, but anyway, that's not important.
+
+40
+00:01:42,000 --> 00:01:45,000
+Important is, let's say we have this form here.
+
+41
+00:01:45,000 --> 00:01:49,000
+Now instead of asking for a number, maybe I want to ask
+
+42
+00:01:49,000 --> 00:01:51,000
+for a particular ID.
+
+43
+00:01:51,000 --> 00:01:53,000
+So every alien will have let's say two things, an ID
+
+44
+00:01:53,000 --> 00:01:57,000
+which is a number which represents you and your name.
+
+45
+00:01:57,000 --> 00:01:59,000
+So I'm saying enter ID
+
+46
+00:01:59,000 --> 00:02:01,000
+and this is for a ID, which is alien ID.
+
+47
+00:02:01,000 --> 00:02:03,000
+The ID is aid.
+
+48
+00:02:03,000 --> 00:02:08,000
+The name is aid, and I'm saying enter the name.
+
+49
+00:02:08,000 --> 00:02:12,000
+So I'm saying enter name and then this is for, aname.
+
+50
+00:02:12,000 --> 00:02:16,000
+Let's say that's the idea, I want to go for aname.
+
+51
+00:02:16,000 --> 00:02:19,000
+This is for aname, and then I'm saying submit.
+
+52
+00:02:19,000 --> 00:02:22,000
+Instead of saying add these two numbers, let's say I want
+
+53
+00:02:22,000 --> 00:02:24,000
+to add a new entry for the alien.
+
+54
+00:02:24,000 --> 00:02:26,000
+Okay, so what is an alien?
+
+55
+00:02:26,000 --> 00:02:29,000
+Alien is an entity which has two things, ID and a name.
+
+56
+00:02:29,000 --> 00:02:32,000
+And you are entering those details here.
+
+57
+00:02:32,000 --> 00:02:35,000
+And when you click on submit, you are requesting
+
+58
+00:02:35,000 --> 00:02:36,000
+for add alien.
+
+59
+00:02:36,000 --> 00:02:38,000
+Okay, now how will this look?
+
+60
+00:02:38,000 --> 00:02:40,000
+So if I go back, refresh this page
+
+61
+00:02:40,000 --> 00:02:42,000
+or restart the application first,
+
+62
+00:02:42,000 --> 00:02:45,000
+and if I go back to my output page, refresh this
+
+63
+00:02:45,000 --> 00:02:47,000
+so you can see I'm asking for the ID.
+
+64
+00:02:47,000 --> 00:02:50,000
+Let's say ID is 101 and name here is Navin.
+
+65
+00:02:50,000 --> 00:02:53,000
+Now when I say submit, you can see it says 404.
+
+66
+00:02:53,000 --> 00:02:56,000
+You know why, it's because we don't have
+
+67
+00:02:56,000 --> 00:02:57,000
+the controller for this.
+
+68
+00:02:57,000 --> 00:02:59,000
+So what I will do is I will,
+
+69
+00:02:59,000 --> 00:03:01,000
+I need a controller for add alien.
+
+70
+00:03:01,000 --> 00:03:04,000
+So I will just reuse my code, I mean that's what you say.
+
+71
+00:03:04,000 --> 00:03:08,000
+Instead of copy pasting, I will say add alien.
+
+72
+00:03:08,000 --> 00:03:11,000
+And this time the method name is also add alien.
+
+73
+00:03:11,000 --> 00:03:13,000
+So basically I'm requesting for this particular
+
+74
+00:03:13,000 --> 00:03:15,000
+UL here, this is my part.
+
+75
+00:03:15,000 --> 00:03:17,000
+But what about the parameters?
+
+76
+00:03:17,000 --> 00:03:20,000
+Of course I'm not sending num one, I'm sending aid.
+
+77
+00:03:20,000 --> 00:03:23,000
+The variable is also an ID, I'm not sending num two.
+
+78
+00:03:23,000 --> 00:03:28,000
+What I'm sending is aname and aname is of type string
+
+79
+00:03:28,000 --> 00:03:31,000
+and I'm saying aname here.
+
+80
+00:03:31,000 --> 00:03:33,000
+Now basically what we're doing is we are accepting
+
+81
+00:03:33,000 --> 00:03:34,000
+that particular alien
+
+82
+00:03:34,000 --> 00:03:39,000
+and the values are ID and aname.
+
+83
+00:03:39,000 --> 00:03:40,000
+That's what we are fetching from the URL
+
+84
+00:03:40,000 --> 00:03:43,000
+because if you see the URL here,
+
+85
+00:03:43,000 --> 00:03:46,000
+we are sending this data in the URL, so it should work.
+
+86
+00:03:46,000 --> 00:03:48,000
+So this data is coming here,
+
+87
+00:03:48,000 --> 00:03:49,000
+but then what we are doing with data,
+
+88
+00:03:49,000 --> 00:03:52,000
+of course we don't want to add basically let's say I want
+
+89
+00:03:52,000 --> 00:03:56,000
+to create an aided object and save this data.
+
+90
+00:03:56,000 --> 00:03:57,000
+Of course, right, in the Java world,
+
+91
+00:03:57,000 --> 00:03:59,000
+everything should be in the object
+
+92
+00:03:59,000 --> 00:04:01,000
+and we don't have a object yet.
+
+93
+00:04:01,000 --> 00:04:03,000
+So even if I try to create the object of alien
+
+94
+00:04:03,000 --> 00:04:07,000
+by saying object alien equal to new alien,
+
+95
+00:04:07,000 --> 00:04:10,000
+unfortunately we don't have this object
+
+96
+00:04:10,000 --> 00:04:11,000
+or this class itself.
+
+97
+00:04:11,000 --> 00:04:15,000
+So what we can do is we can create a class.
+
+98
+00:04:15,000 --> 00:04:17,000
+So you can get a class in the same package.
+
+99
+00:04:17,000 --> 00:04:18,000
+Normally it should be a different package,
+
+100
+00:04:18,000 --> 00:04:20,000
+but we'll do that packaging part later.
+
+101
+00:04:20,000 --> 00:04:22,000
+Let's say everything is in the same package.
+
+102
+00:04:22,000 --> 00:04:26,000
+So if I go back here, SRC, main, Java,
+
+103
+00:04:26,000 --> 00:04:28,000
+I have everything in this package, okay?
+
+104
+00:04:28,000 --> 00:04:31,000
+If I go back to alien, alien needs two things.
+
+105
+00:04:31,000 --> 00:04:34,000
+One is private into ID
+
+106
+00:04:34,000 --> 00:04:38,000
+and private string name,
+
+107
+00:04:38,000 --> 00:04:39,000
+in fact not aname.
+
+108
+00:04:39,000 --> 00:04:43,000
+And I want this to be aid and aname.
+
+109
+00:04:43,000 --> 00:04:46,000
+And then for these two private variables,
+
+110
+00:04:46,000 --> 00:04:47,000
+I need getters and setters.
+
+111
+00:04:47,000 --> 00:04:50,000
+So I will right click here, say generate getters
+
+112
+00:04:50,000 --> 00:04:53,000
+for these two variables, click on, okay, we got that.
+
+113
+00:04:53,000 --> 00:04:55,000
+Also, I need a method for toString.
+
+114
+00:04:55,000 --> 00:04:59,000
+So I will say right click here, generate toString
+
+115
+00:04:59,000 --> 00:05:02,000
+for which will return both these values.
+
+116
+00:05:02,000 --> 00:05:04,000
+So basically we've got a toString method,
+
+117
+00:05:04,000 --> 00:05:06,000
+which will return this data here.
+
+118
+00:05:06,000 --> 00:05:07,000
+Okay, now what did it'll return?
+
+119
+00:05:07,000 --> 00:05:11,000
+It'll print alien, the alien ID and the alien name.
+
+120
+00:05:11,000 --> 00:05:14,000
+That's what we want, nothing fancy,
+
+121
+00:05:14,000 --> 00:05:15,000
+simple class, simple pojo.
+
+122
+00:05:15,000 --> 00:05:17,000
+Go back to the controller, now you can see we do have this
+
+123
+00:05:17,000 --> 00:05:19,000
+class and we've got the object now.
+
+124
+00:05:19,000 --> 00:05:23,000
+I want to send the same object in this.
+
+125
+00:05:23,000 --> 00:05:24,000
+So I'm sending alien now
+
+126
+00:05:24,000 --> 00:05:28,000
+and maybe in short result I want to send the alien itself.
+
+127
+00:05:28,000 --> 00:05:30,000
+So whatever data I'm receiving,
+
+128
+00:05:30,000 --> 00:05:32,000
+I'm calling the same page, which is result.
+
+129
+00:05:32,000 --> 00:05:36,000
+But then the data which I'm sending now is alien data.
+
+130
+00:05:36,000 --> 00:05:38,000
+So of course in the result I have
+
+131
+00:05:38,000 --> 00:05:40,000
+to make changes instead of printing result here
+
+132
+00:05:40,000 --> 00:05:42,000
+I will print alien.
+
+133
+00:05:42,000 --> 00:05:44,000
+Or maybe we can have some fancy message here.
+
+134
+00:05:44,000 --> 00:05:46,000
+Let's do in the H2 tag, I want to say
+
+135
+00:05:46,000 --> 00:05:49,000
+Welcome to Telusko, okay, so this is data.
+
+136
+00:05:49,000 --> 00:05:51,000
+I want to, this is what I want to print on the screen.
+
+137
+00:05:51,000 --> 00:05:55,000
+And then I want to print the alien object, not result.
+
+138
+00:05:55,000 --> 00:05:58,000
+Let's say just a simple alien object
+
+139
+00:05:58,000 --> 00:05:59,000
+and maybe we can put that in a P tag.
+
+140
+00:05:59,000 --> 00:06:02,000
+I hope I have CSS for P.
+
+141
+00:06:02,000 --> 00:06:04,000
+Let's say I want to go for P tag here.
+
+142
+00:06:04,000 --> 00:06:08,000
+Just need to check if I have a P tag in the CSS.
+
+143
+00:06:09,000 --> 00:06:12,000
+Yeah, I do have, and now if I want to print this,
+
+144
+00:06:12,000 --> 00:06:14,000
+basically this should work, right?
+
+145
+00:06:14,000 --> 00:06:16,000
+So what I'm doing is from the index.jsp,
+
+146
+00:06:16,000 --> 00:06:17,000
+this is my homepage.
+
+147
+00:06:17,000 --> 00:06:19,000
+I got two entries.
+
+148
+00:06:19,000 --> 00:06:22,000
+I'm calling the add alien, which will, the request goes
+
+149
+00:06:22,000 --> 00:06:23,000
+to the controller, which is here.
+
+150
+00:06:23,000 --> 00:06:25,000
+And here we are saying add alien.
+
+151
+00:06:25,000 --> 00:06:28,000
+It'll accept these two values, aid and aname.
+
+152
+00:06:28,000 --> 00:06:31,000
+Save that in two variables, aid and aname.
+
+153
+00:06:31,000 --> 00:06:33,000
+And then we are creating an alien object.
+
+154
+00:06:33,000 --> 00:06:36,000
+But you know, we forgot one thing.
+
+155
+00:06:36,000 --> 00:06:38,000
+In the alien, we need to set the id,
+
+156
+00:06:38,000 --> 00:06:41,000
+let's say aid is whatever you're sending from there.
+
+157
+00:06:41,000 --> 00:06:43,000
+And we have to also set the aname.
+
+158
+00:06:43,000 --> 00:06:47,000
+I will set the aname as aname, okay?
+
+159
+00:06:47,000 --> 00:06:49,000
+So whatever data I've received here, I will just put
+
+160
+00:06:49,000 --> 00:06:52,000
+that in the object and that object I'm sending here.
+
+161
+00:06:52,000 --> 00:06:54,000
+But the question is, will it work, let's try it out.
+
+162
+00:06:54,000 --> 00:06:57,000
+So I'll just run this and go back to the browser.
+
+163
+00:06:57,000 --> 00:07:00,000
+Let's say I want to go to the homepage, let's refresh.
+
+164
+00:07:00,000 --> 00:07:02,000
+Or maybe I can click on submit.
+
+165
+00:07:02,000 --> 00:07:05,000
+So when you click on submit, you can see we got data.
+
+166
+00:07:05,000 --> 00:07:07,000
+This is working, right, so it says, Welcome to Telusko,
+
+167
+00:07:07,000 --> 00:07:11,000
+and then we are also printing the data.
+
+168
+00:07:11,000 --> 00:07:13,000
+Okay, so this is working, but, but, but.
+
+169
+00:07:13,000 --> 00:07:15,000
+We have one little problem here.
+
+170
+00:07:15,000 --> 00:07:17,000
+The problem is actually not a problem,
+
+171
+00:07:17,000 --> 00:07:19,000
+but then a better way to do it, don't you think?
+
+172
+00:07:19,000 --> 00:07:22,000
+We are accepting value one by one anyway,
+
+173
+00:07:22,000 --> 00:07:23,000
+we are sending this data
+
+174
+00:07:23,000 --> 00:07:25,000
+and then we do have the alien object
+
+175
+00:07:25,000 --> 00:07:28,000
+or alien class, which can represent these two values.
+
+176
+00:07:28,000 --> 00:07:31,000
+What if you have, your class has 10 values?
+
+177
+00:07:31,000 --> 00:07:33,000
+What if your class has, okay, hyper example,
+
+178
+00:07:33,000 --> 00:07:35,000
+let's say your class has 10 variables.
+
+179
+00:07:35,000 --> 00:07:38,000
+In that case, in this particular bracket, you have
+
+180
+00:07:38,000 --> 00:07:42,000
+to write 10 times at the rate request per not cool, right?
+
+181
+00:07:42,000 --> 00:07:45,000
+So can we just remove this
+
+182
+00:07:45,000 --> 00:07:49,000
+and accept with one particular object?
+
+183
+00:07:49,000 --> 00:07:51,000
+Okay, that will be good, right, so how do we do that?
+
+184
+00:07:51,000 --> 00:07:53,000
+Let's see, the next video again, you know the title
+
+185
+00:07:53,000 --> 00:07:58,000
+of the video it says Need for Model Attribute.
+
+186
+00:07:58,000 --> 00:07:59,000
+So yeah, we are going to use model attribute
+
+187
+00:07:59,000 --> 00:08:00,000
+to solve this problem.
+

12 - Spring Boot Web/018 Source-Code.url

@@ -0,0 +1,2 @@
+[InternetShortcut]
+URL=https://github.com/navinreddy20/spring6-course/tree/f1161e151ea06b68810b3cae03005d4955a96a8b/6%20Spring%20%20Boot%20Web/5.18%20Need%20for%20ModelAttribute

12 - Spring Boot Web/019 Source-Code.url

@@ -0,0 +1,2 @@
+[InternetShortcut]
+URL=https://github.com/navinreddy20/spring6-course/tree/f1161e151ea06b68810b3cae03005d4955a96a8b/6%20Spring%20%20Boot%20Web/5.19%20Using%20ModelAttribute

12 - Spring Boot Web/019 Using ModelAttribute_en.srt

@@ -0,0 +1,616 @@
+1
+00:00:00,000 --> 00:00:03,000
+(soft music)
+
+2
+00:00:03,000 --> 00:00:06,000
+-: So let's use the model attribute to solve this problem.
+
+3
+00:00:06,000 --> 00:00:10,000
+So instead of using request param for these two variables,
+
+4
+00:00:10,000 --> 00:00:12,000
+I can just remove them.
+
+5
+00:00:12,000 --> 00:00:15,000
+And what if I can simply use alien, alien?
+
+6
+00:00:15,000 --> 00:00:16,000
+Our job is done.
+
+7
+00:00:16,000 --> 00:00:18,000
+So what I'm expecting is from the form,
+
+8
+00:00:18,000 --> 00:00:20,000
+when then this data is coming,
+
+9
+00:00:20,000 --> 00:00:22,000
+it'll directly assign the value to the alien object.
+
+10
+00:00:22,000 --> 00:00:26,000
+So basically I want Spring to create this object.
+
+11
+00:00:26,000 --> 00:00:27,000
+Basically I don't want to do this step,
+
+12
+00:00:27,000 --> 00:00:29,000
+I want to skip this steps.
+
+13
+00:00:29,000 --> 00:00:31,000
+So I want Spring to create this object
+
+14
+00:00:31,000 --> 00:00:34,000
+and then assign those two values
+
+15
+00:00:34,000 --> 00:00:37,000
+which is coming from the browser.
+
+16
+00:00:37,000 --> 00:00:40,000
+So that is, not the browser but the request.
+
+17
+00:00:40,000 --> 00:00:41,000
+So can we do that?
+
+18
+00:00:41,000 --> 00:00:44,000
+So to achieve that we have to use something called
+
+19
+00:00:44,000 --> 00:00:46,000
+a model attribute.
+
+20
+00:00:46,000 --> 00:00:48,000
+Now this is the annotation which is responsible
+
+21
+00:00:48,000 --> 00:00:51,000
+to assign the value to the alien object.
+
+22
+00:00:51,000 --> 00:00:52,000
+Of course you can assign a different name to it.
+
+23
+00:00:52,000 --> 00:00:55,000
+So even this becomes optional.
+
+24
+00:00:55,000 --> 00:00:56,000
+Model view,
+
+25
+00:00:56,000 --> 00:00:59,000
+you can simply return the result here, lemme show you that.
+
+26
+00:00:59,000 --> 00:01:03,000
+So I can just remove this and instead of model and view
+
+27
+00:01:03,000 --> 00:01:04,000
+let's return a string again.
+
+28
+00:01:04,000 --> 00:01:06,000
+So you don't have to return the object.
+
+29
+00:01:06,000 --> 00:01:10,000
+So here we can mention I'm calling the result page.
+
+30
+00:01:10,000 --> 00:01:11,000
+So this object I'm receiving here
+
+31
+00:01:11,000 --> 00:01:14,000
+and that object will go to the JSB page.
+
+32
+00:01:14,000 --> 00:01:16,000
+Okay, that's what I'm expecting now.
+
+33
+00:01:16,000 --> 00:01:18,000
+So this step is also optional
+
+34
+00:01:18,000 --> 00:01:20,000
+and that can be done with the helper model object,
+
+35
+00:01:20,000 --> 00:01:21,000
+which we have talked about.
+
+36
+00:01:21,000 --> 00:01:23,000
+And now let's refresh this.
+
+37
+00:01:23,000 --> 00:01:24,000
+Let's see if it works.
+
+38
+00:01:24,000 --> 00:01:27,000
+Okay, no problem on the server, we are running it.
+
+39
+00:01:27,000 --> 00:01:29,000
+Let's go back to the homepage
+
+40
+00:01:29,000 --> 00:01:31,000
+and this time we'll enter some different data.
+
+41
+00:01:31,000 --> 00:01:33,000
+101, Harsh, click on submit and it worked.
+
+42
+00:01:33,000 --> 00:01:37,000
+You can see that we got 101 and we also got Harsh there.
+
+43
+00:01:37,000 --> 00:01:38,000
+So this is working.
+
+44
+00:01:38,000 --> 00:01:40,000
+So basically we can use a model attribute.
+
+45
+00:01:40,000 --> 00:01:42,000
+So let's say I want to change something.
+
+46
+00:01:42,000 --> 00:01:45,000
+So instead of alien, which I'm printing here,
+
+47
+00:01:45,000 --> 00:01:46,000
+what if I want to print alien1?
+
+48
+00:01:47,000 --> 00:01:48,000
+Now basically when I'm printing alien1,
+
+49
+00:01:48,000 --> 00:01:51,000
+let's see what happens if I restart my server
+
+50
+00:01:51,000 --> 00:01:52,000
+and let's go back to the homepage.
+
+51
+00:01:52,000 --> 00:01:55,000
+If I click on submit here with different data,
+
+52
+00:01:55,000 --> 00:01:57,000
+you can see it's not working.
+
+53
+00:01:57,000 --> 00:02:01,000
+Reason you are sending this data with a name alien
+
+54
+00:02:01,000 --> 00:02:04,000
+but what you are receiving here is alien1.
+
+55
+00:02:04,000 --> 00:02:06,000
+So what if you want to have alien1 here?
+
+56
+00:02:06,000 --> 00:02:10,000
+So what you can do is you can give that name here.
+
+57
+00:02:10,000 --> 00:02:11,000
+So you can say alien1.
+
+58
+00:02:11,000 --> 00:02:14,000
+So now this name will be representing there.
+
+59
+00:02:14,000 --> 00:02:18,000
+So let's try and go back, say submit.
+
+60
+00:02:18,000 --> 00:02:19,000
+So you can see it works.
+
+61
+00:02:19,000 --> 00:02:21,000
+So basically if you want to have a different name
+
+62
+00:02:21,000 --> 00:02:24,000
+than alien, then you have to mention that thing here.
+
+63
+00:02:24,000 --> 00:02:25,000
+But what if it's the same name?
+
+64
+00:02:25,000 --> 00:02:29,000
+What if it is alien and go back here
+
+65
+00:02:29,000 --> 00:02:31,000
+and let's remove this.
+
+66
+00:02:31,000 --> 00:02:32,000
+So this will work, right?
+
+67
+00:02:32,000 --> 00:02:36,000
+But what if I also remove the model attribute?
+
+68
+00:02:36,000 --> 00:02:37,000
+Is it really compulsory?
+
+69
+00:02:37,000 --> 00:02:38,000
+Let's try.
+
+70
+00:02:38,000 --> 00:02:40,000
+So I'm removing model attribute now,
+
+71
+00:02:40,000 --> 00:02:41,000
+so there's no model attribute.
+
+72
+00:02:41,000 --> 00:02:46,000
+Let's go back and submit, it still works.
+
+73
+00:02:46,000 --> 00:02:48,000
+So basically the model attribute is optional.
+
+74
+00:02:48,000 --> 00:02:50,000
+It is something which comes behind the scene.
+
+75
+00:02:50,000 --> 00:02:53,000
+It is responsible to add your data to the alien.
+
+76
+00:02:53,000 --> 00:02:55,000
+So when you don't want to have a different name,
+
+77
+00:02:55,000 --> 00:02:57,000
+you can completely skip model attribute.
+
+78
+00:02:57,000 --> 00:02:59,000
+And that's why most of the time you will not see
+
+79
+00:02:59,000 --> 00:03:01,000
+model attribute annotation there
+
+80
+00:03:01,000 --> 00:03:03,000
+because most of the time we are using the same name.
+
+81
+00:03:03,000 --> 00:03:06,000
+But yes, if you want to have a different name here,
+
+82
+00:03:06,000 --> 00:03:09,000
+then we have to use the model attribute annotation.
+
+83
+00:03:09,000 --> 00:03:11,000
+Not just that, we can also use model attribute
+
+84
+00:03:11,000 --> 00:03:12,000
+on method level.
+
+85
+00:03:12,000 --> 00:03:16,000
+Basically we have used that for the method arguments.
+
+86
+00:03:16,000 --> 00:03:18,000
+But what if you want to use on a method level,
+
+87
+00:03:18,000 --> 00:03:20,000
+something like this.
+
+88
+00:03:20,000 --> 00:03:22,000
+Let's say I have this page here.
+
+89
+00:03:22,000 --> 00:03:23,000
+Now I'm saying welcome to Telusko,
+
+90
+00:03:23,000 --> 00:03:25,000
+I'm also printing the alien name
+
+91
+00:03:25,000 --> 00:03:29,000
+and maybe I also want to print that welcome to the course.
+
+92
+00:03:29,000 --> 00:03:31,000
+So I will use a P tag here
+
+93
+00:03:31,000 --> 00:03:32,000
+and close the P tag.
+
+94
+00:03:32,000 --> 00:03:36,000
+And inside this I want to say
+
+95
+00:03:36,000 --> 00:03:41,000
+welcome to the Java world.
+
+96
+00:03:41,000 --> 00:03:42,000
+Okay?
+
+97
+00:03:42,000 --> 00:03:44,000
+Now of course this is a Java course
+
+98
+00:03:44,000 --> 00:03:45,000
+so it makes sense to print this.
+
+99
+00:03:45,000 --> 00:03:48,000
+But what if I want to print different things
+
+100
+00:03:48,000 --> 00:03:49,000
+for different courses?
+
+101
+00:03:49,000 --> 00:03:51,000
+Let's say for blockchain it should be
+
+102
+00:03:51,000 --> 00:03:52,000
+welcome to the blockchain world,
+
+103
+00:03:52,000 --> 00:03:54,000
+welcome to the AI world,
+
+104
+00:03:54,000 --> 00:03:57,000
+welcome to the .NET world, something like this.
+
+105
+00:03:57,000 --> 00:03:58,000
+So I want this to be dynamic,
+
+106
+00:03:58,000 --> 00:04:01,000
+not something like Java everywhere.
+
+107
+00:04:01,000 --> 00:04:03,000
+So we can put that in as a variable.
+
+108
+00:04:03,000 --> 00:04:05,000
+So you can say variable name is course
+
+109
+00:04:05,000 --> 00:04:09,000
+and I can just use a dollar symbol here, right?
+
+110
+00:04:09,000 --> 00:04:10,000
+So we have to provide this value
+
+111
+00:04:10,000 --> 00:04:12,000
+because if you don't provide this value,
+
+112
+00:04:12,000 --> 00:04:14,000
+you can see in the home controller nowhere we are specifying
+
+113
+00:04:14,000 --> 00:04:16,000
+the value for the course.
+
+114
+00:04:16,000 --> 00:04:19,000
+And if we don't specify the value for it,
+
+115
+00:04:19,000 --> 00:04:22,000
+let's read on this application without specifying
+
+116
+00:04:22,000 --> 00:04:23,000
+any value for course.
+
+117
+00:04:23,000 --> 00:04:25,000
+And let's refresh the result page.
+
+118
+00:04:25,000 --> 00:04:28,000
+You can see it says welcome to the world, which world?
+
+119
+00:04:28,000 --> 00:04:30,000
+Basically it's not printing the course.
+
+120
+00:04:30,000 --> 00:04:31,000
+So how do I assign the value?
+
+121
+00:04:31,000 --> 00:04:33,000
+Of course you can assign the value from here,
+
+122
+00:04:33,000 --> 00:04:35,000
+you can create a model view object
+
+123
+00:04:35,000 --> 00:04:38,000
+or maybe you can create a model object, add the data there,
+
+124
+00:04:38,000 --> 00:04:42,000
+or we can create a separate method which will return
+
+125
+00:04:42,000 --> 00:04:43,000
+the course names.
+
+126
+00:04:43,000 --> 00:04:46,000
+I will say public string course name.
+
+127
+00:04:46,000 --> 00:04:48,000
+And of course this can be dynamic.
+
+128
+00:04:48,000 --> 00:04:49,000
+Now you can write some JDBC code,
+
+129
+00:04:49,000 --> 00:04:52,000
+you can write some database code to create your database
+
+130
+00:04:52,000 --> 00:04:54,000
+and check which course this person is enrolled into.
+
+131
+00:04:54,000 --> 00:04:58,000
+But at this point I'll just make it static.
+
+132
+00:04:58,000 --> 00:05:00,000
+At least we have a control now, right?
+
+133
+00:05:00,000 --> 00:05:01,000
+I want to return Java here
+
+134
+00:05:02,000 --> 00:05:04,000
+and you can return whatever you want.
+
+135
+00:05:04,000 --> 00:05:06,000
+You can write the complete code as I mentioned before.
+
+136
+00:05:06,000 --> 00:05:09,000
+But here just to keep it simple, I'm saying Java.
+
+137
+00:05:09,000 --> 00:05:12,000
+And here I can use a model attribute
+
+138
+00:05:12,000 --> 00:05:15,000
+and in the bracket I can mention the course.
+
+139
+00:05:15,000 --> 00:05:18,000
+So basically what we are doing is the value for the course
+
+140
+00:05:18,000 --> 00:05:20,000
+is whatever this particular method returns.
+
+141
+00:05:20,000 --> 00:05:22,000
+It is Java, so it'll say Java.
+
+142
+00:05:22,000 --> 00:05:25,000
+If we return something else, it'll be that particular value.
+
+143
+00:05:25,000 --> 00:05:28,000
+So we can use model attribute on top of the method as well.
+
+144
+00:05:28,000 --> 00:05:30,000
+And that's why we use it most of the time.
+
+145
+00:05:30,000 --> 00:05:34,000
+If you want to have some values in the result page,
+
+146
+00:05:34,000 --> 00:05:37,000
+which is not generated by a method or some other methods
+
+147
+00:05:39,000 --> 00:05:42,000
+or which is common for most of the requests.
+
+148
+00:05:42,000 --> 00:05:44,000
+So you can see I'm restarting the application,
+
+149
+00:05:44,000 --> 00:05:48,000
+let's refresh this and it worked.
+
+150
+00:05:48,000 --> 00:05:51,000
+Now this basically that's how you use the model attribute
+
+151
+00:05:51,000 --> 00:05:53,000
+on top of this.
+
+152
+00:05:53,000 --> 00:05:54,000
+So yeah, that's it about model attribute.
+
+153
+00:05:54,000 --> 00:05:57,000
+I hope it makes sense, some sense now.
+
+154
+00:05:57,000 --> 00:05:59,000
+When to use, when not to use the model attribute.
+

12 - Spring Boot Web/external-links.txt

@@ -0,0 +1,51 @@
+
+002 Source-Code
+https://github.com/navinreddy20/spring6-course/tree/f1161e151ea06b68810b3cae03005d4955a96a8b/6%20Spring%20%20Boot%20Web/5.2%20Creating%20A%20Servlet%20Project%201
+
+003 Source-Code
+https://github.com/navinreddy20/spring6-course/tree/f1161e151ea06b68810b3cae03005d4955a96a8b/6%20Spring%20%20Boot%20Web/5.3%20Running%20Tomcat
+
+004 Source-Code
+https://github.com/navinreddy20/spring6-course/tree/f1161e151ea06b68810b3cae03005d4955a96a8b/6%20Spring%20%20Boot%20Web/5.4%20Servlet%20Mapping
+
+005 Source-Code
+https://github.com/navinreddy20/spring6-course/tree/f1161e151ea06b68810b3cae03005d4955a96a8b/6%20Spring%20%20Boot%20Web/5.5%20Responding%20To%20The%20Client
+
+007 Source-Code
+https://github.com/navinreddy20/spring6-course/tree/f1161e151ea06b68810b3cae03005d4955a96a8b/6%20Spring%20%20Boot%20Web/5.7%20Creating%20a%20Spring%20Boot%20Web%20App%20Project
+
+008 Source-Code
+https://github.com/navinreddy20/spring6-course/tree/f1161e151ea06b68810b3cae03005d4955a96a8b/6%20Spring%20%20Boot%20Web/5.8%20Creating%20a%20JSP%20Page
+
+009 Source-Code
+https://github.com/navinreddy20/spring6-course/tree/f1161e151ea06b68810b3cae03005d4955a96a8b/6%20Spring%20%20Boot%20Web/5.9%20Creating%20a%20Controller
+
+010 Source-Code
+https://github.com/navinreddy20/spring6-course/tree/f1161e151ea06b68810b3cae03005d4955a96a8b/6%20Spring%20%20Boot%20Web/5.10%20RequestMapping
+
+011 Source-Code
+https://github.com/navinreddy20/spring6-course/tree/f1161e151ea06b68810b3cae03005d4955a96a8b/6%20Spring%20%20Boot%20Web/5.11%20Sending%20data%20to%20Controller
+
+012 Source-Code
+https://github.com/navinreddy20/spring6-course/tree/f1161e151ea06b68810b3cae03005d4955a96a8b/6%20Spring%20%20Boot%20Web/5.12%20Accepting%20Data%20the%20servlet%20way
+
+013 Source-Code
+https://github.com/navinreddy20/spring6-course/tree/f1161e151ea06b68810b3cae03005d4955a96a8b/6%20Spring%20%20Boot%20Web/5.13%20Display%20Data%20on%20Result%20Page
+
+014 Source-Code
+https://github.com/navinreddy20/spring6-course/tree/f1161e151ea06b68810b3cae03005d4955a96a8b/6%20Spring%20%20Boot%20Web/5.14%20RequestParam
+
+015 Source-Code
+https://github.com/navinreddy20/spring6-course/tree/f1161e151ea06b68810b3cae03005d4955a96a8b/6%20Spring%20%20Boot%20Web/5.15%20Model%20Object
+
+016 Source-Code
+https://github.com/navinreddy20/spring6-course/tree/f1161e151ea06b68810b3cae03005d4955a96a8b/6%20Spring%20%20Boot%20Web/5.16%20Setting%20Prefix%20and%20Suffix
+
+017 Source-Code
+https://github.com/navinreddy20/spring6-course/tree/f1161e151ea06b68810b3cae03005d4955a96a8b/6%20Spring%20%20Boot%20Web/5.17%20ModelAndView
+
+018 Source-Code
+https://github.com/navinreddy20/spring6-course/tree/f1161e151ea06b68810b3cae03005d4955a96a8b/6%20Spring%20%20Boot%20Web/5.18%20Need%20for%20ModelAttribute
+
+019 Source-Code
+https://github.com/navinreddy20/spring6-course/tree/f1161e151ea06b68810b3cae03005d4955a96a8b/6%20Spring%20%20Boot%20Web/5.19%20Using%20ModelAttribute

13 - Exploring Web MVC without Spring Boot/001 Spring MVC Introduction_en.srt

@@ -0,0 +1,316 @@
+1
+00:00:00,000 --> 00:00:03,000
+(gentle music)
+
+2
+00:00:03,000 --> 00:00:06,000
+-: In this module, we'll talk about Spring MVC.
+
+3
+00:00:06,000 --> 00:00:07,000
+Now you will say, "Hey, we have done that before," right?
+
+4
+00:00:07,000 --> 00:00:10,000
+We have talked about Spring MVC.
+
+5
+00:00:10,000 --> 00:00:12,000
+Actually we talked about Spring Boot MVC.
+
+6
+00:00:12,000 --> 00:00:14,000
+So basically, we have used MVC,
+
+7
+00:00:14,000 --> 00:00:16,000
+but then with the help of Spring Boot.
+
+8
+00:00:16,000 --> 00:00:19,000
+Now, what it does is it makes our job easy
+
+9
+00:00:19,000 --> 00:00:20,000
+and that's what we have done, right?
+
+10
+00:00:20,000 --> 00:00:23,000
+So basically, we were able to build the controller.
+
+11
+00:00:23,000 --> 00:00:24,000
+We were able to go to our page.
+
+12
+00:00:24,000 --> 00:00:25,000
+So, what page I'm talking about?
+
+13
+00:00:25,000 --> 00:00:28,000
+So if I run this application once again,
+
+14
+00:00:28,000 --> 00:00:31,000
+just show you what we have done till now.
+
+15
+00:00:31,000 --> 00:00:33,000
+If I go to the homepage,
+
+16
+00:00:33,000 --> 00:00:34,000
+you can say it is giving you this page
+
+17
+00:00:34,000 --> 00:00:38,000
+because we have done with the UI, with the controllers,
+
+18
+00:00:38,000 --> 00:00:41,000
+I mean controllers, property files,
+
+19
+00:00:41,000 --> 00:00:43,000
+we have done some configuration here, right?
+
+20
+00:00:43,000 --> 00:00:44,000
+Now, this works,
+
+21
+00:00:44,000 --> 00:00:47,000
+but then we have talked about Spring Boot, right?
+
+22
+00:00:47,000 --> 00:00:49,000
+It makes your work easy.
+
+23
+00:00:49,000 --> 00:00:51,000
+There's another way of doing the same thing
+
+24
+00:00:51,000 --> 00:00:52,000
+without Spring Boot.
+
+25
+00:00:52,000 --> 00:00:56,000
+That is, with the help of Spring Framework directly.
+
+26
+00:00:56,000 --> 00:00:58,000
+So, we have a component called Spring MVC
+
+27
+00:00:58,000 --> 00:01:00,000
+which we're going to focus in this section.
+
+28
+00:01:00,000 --> 00:01:02,000
+Now here, we'll do the same thing, okay?
+
+29
+00:01:02,000 --> 00:01:04,000
+Same project, maybe we'll reuse the code,
+
+30
+00:01:04,000 --> 00:01:06,000
+but we'll not be using Spring Boot.
+
+31
+00:01:06,000 --> 00:01:11,000
+That means we have to do lot of configuration by ourself
+
+32
+00:01:11,000 --> 00:01:14,000
+and in the entire section, of course, nothing will be new
+
+33
+00:01:14,000 --> 00:01:17,000
+because the flow will be same, the controller will be same.
+
+34
+00:01:17,000 --> 00:01:19,000
+What will change is the configuration.
+
+35
+00:01:19,000 --> 00:01:21,000
+So I want your focus mostly on the configuration,
+
+36
+00:01:21,000 --> 00:01:23,000
+not on the other things.
+
+37
+00:01:23,000 --> 00:01:24,000
+So, what are the things we need?
+
+38
+00:01:24,000 --> 00:01:26,000
+Now, first of all, if you want to build web application
+
+39
+00:01:26,000 --> 00:01:27,000
+without Spring Boot,
+
+40
+00:01:27,000 --> 00:01:30,000
+basically in this project we have used a embedded Tomcat.
+
+41
+00:01:30,000 --> 00:01:31,000
+But then in Spring Framework,
+
+42
+00:01:31,000 --> 00:01:34,000
+we'll be using a external Tomcat.
+
+43
+00:01:34,000 --> 00:01:35,000
+So what you need,
+
+44
+00:01:35,000 --> 00:01:37,000
+the first thing is the external Tomcat.
+
+45
+00:01:37,000 --> 00:01:39,000
+How will you get that? It's very easy.
+
+46
+00:01:39,000 --> 00:01:42,000
+You can just go to the Google
+
+47
+00:01:42,000 --> 00:01:45,000
+and search for Apache Tomcat download,
+
+48
+00:01:45,000 --> 00:01:47,000
+and you can get the version 10, which works.
+
+49
+00:01:47,000 --> 00:01:50,000
+In fact, I'll be using version 10 here.
+
+50
+00:01:50,000 --> 00:01:51,000
+And depend upon which OS you are using,
+
+51
+00:01:51,000 --> 00:01:55,000
+you can get this and it'd work.
+
+52
+00:01:55,000 --> 00:01:58,000
+So basically, I've got the zip folder,
+
+53
+00:01:58,000 --> 00:01:59,000
+then I unzipped it,
+
+54
+00:01:59,000 --> 00:02:01,000
+and now I have that in my Download folder.
+
+55
+00:02:01,000 --> 00:02:02,000
+That's the first thing you need.
+
+56
+00:02:02,000 --> 00:02:04,000
+The next thing you will need is a IDE.
+
+57
+00:02:04,000 --> 00:02:07,000
+Okay, we are using the IntelliJ, right?
+
+58
+00:02:07,000 --> 00:02:09,000
+But then, IntelliJ IDEA which we are using
+
+59
+00:02:09,000 --> 00:02:09,000
+is a community version,
+
+60
+00:02:09,000 --> 00:02:12,000
+which means basically we have to use...
+
+61
+00:02:12,000 --> 00:02:15,000
+It doesn't, by default, support the external servers.
+
+62
+00:02:15,000 --> 00:02:16,000
+If you want to use IntelliJ,
+
+63
+00:02:16,000 --> 00:02:19,000
+you can use the Ultimate version.
+
+64
+00:02:19,000 --> 00:02:21,000
+Now, since we want to focus on the free softwares here,
+
+65
+00:02:21,000 --> 00:02:23,000
+so I'm going to use Eclipse for this section
+
+66
+00:02:23,000 --> 00:02:26,000
+because Eclipse is free and we can run the servers.
+
+67
+00:02:26,000 --> 00:02:27,000
+Okay, before we go ahead,
+
+68
+00:02:27,000 --> 00:02:30,000
+I want to show you one more thing regarding the Tomcat.
+
+69
+00:02:30,000 --> 00:02:32,000
+So, you can see it says Tomcat 10.
+
+70
+00:02:32,000 --> 00:02:35,000
+They have made some changes from Java EE to Jakarta EE.
+
+71
+00:02:35,000 --> 00:02:38,000
+So basically, certain things will change in Tomcat 10.
+
+72
+00:02:38,000 --> 00:02:41,000
+So instead of using Java X, we are going to use Jakarta X,
+
+73
+00:02:41,000 --> 00:02:43,000
+I mean Jakarta, not X.
+
+74
+00:02:43,000 --> 00:02:45,000
+So if you don't want to use Jakarta,
+
+75
+00:02:45,000 --> 00:02:48,000
+you can still go back to Tomcat 9 which uses Java X,
+
+76
+00:02:48,000 --> 00:02:51,000
+and you can still use it.
+
+77
+00:02:51,000 --> 00:02:52,000
+Okay, anyway, once we got this software,
+
+78
+00:02:52,000 --> 00:02:54,000
+it doesn't matter which one you get,
+
+79
+00:02:54,000 --> 00:02:57,000
+we can start working on the same project.
+

13 - Exploring Web MVC without Spring Boot/002 Creating a Spring MVC Project_en.srt

@@ -0,0 +1,776 @@
+1
+00:00:00,000 --> 00:00:03,000
+(gentle music)
+
+2
+00:00:03,000 --> 00:00:05,000
+-: So the first step here is to get IDE.
+
+3
+00:00:05,000 --> 00:00:07,000
+We have talked about we can use Eclipse here,
+
+4
+00:00:07,000 --> 00:00:08,000
+and it's very easy.
+
+5
+00:00:08,000 --> 00:00:10,000
+You can just go to Google, download the Eclipse version,
+
+6
+00:00:10,000 --> 00:00:14,000
+but make sure you get the Eclipse Java EE version,
+
+7
+00:00:14,000 --> 00:00:17,000
+not normal Eclipse for Java developers.
+
+8
+00:00:17,000 --> 00:00:17,000
+So you have to make sure
+
+9
+00:00:17,000 --> 00:00:19,000
+that you get it for enterprise developers.
+
+10
+00:00:19,000 --> 00:00:21,000
+And once you have that, you can open Eclipse
+
+11
+00:00:21,000 --> 00:00:23,000
+and I'm opening Eclipse now.
+
+12
+00:00:23,000 --> 00:00:25,000
+Okay, so this is my Eclipse here
+
+13
+00:00:25,000 --> 00:00:29,000
+and then I'm using a workspace name as spring.
+
+14
+00:00:29,000 --> 00:00:31,000
+Of course, when you open Eclipse, it will ask you
+
+15
+00:00:31,000 --> 00:00:33,000
+for a name, for the workspace,
+
+16
+00:00:33,000 --> 00:00:34,000
+just mention whatever you want.
+
+17
+00:00:34,000 --> 00:00:36,000
+I have a workspace here with name spring.
+
+18
+00:00:36,000 --> 00:00:38,000
+Okay, so in this, let's create a project.
+
+19
+00:00:38,000 --> 00:00:40,000
+Now since we are not using Spring Boot,
+
+20
+00:00:40,000 --> 00:00:43,000
+so we'll not be going to the official Spring initializer,
+
+21
+00:00:43,000 --> 00:00:45,000
+we will be using the Maven project.
+
+22
+00:00:45,000 --> 00:00:48,000
+So here let me create a Maven project.
+
+23
+00:00:48,000 --> 00:00:52,000
+So I will just go to the File, and say New, Maven Project.
+
+24
+00:00:52,000 --> 00:00:53,000
+Now since this will be a web application,
+
+25
+00:00:53,000 --> 00:00:54,000
+we'll choose a different doc type.
+
+26
+00:00:54,000 --> 00:00:56,000
+So just observe what I'm doing.
+
+27
+00:00:56,000 --> 00:00:57,000
+So I will click on Next here,
+
+28
+00:00:57,000 --> 00:00:59,000
+and this is where it says catalog.
+
+29
+00:00:59,000 --> 00:01:01,000
+I will be clicking on Internal.
+
+30
+00:01:01,000 --> 00:01:04,000
+In the Internal catalog, instead of going for quickstart,
+
+31
+00:01:04,000 --> 00:01:06,000
+we'll be going for a web application,
+
+32
+00:01:06,000 --> 00:01:09,000
+because we are building a Spring web application
+
+33
+00:01:09,000 --> 00:01:10,000
+using Spring MVC.
+
+34
+00:01:10,000 --> 00:01:12,000
+So select this, click on Next.
+
+35
+00:01:12,000 --> 00:01:13,000
+It will ask you for the group ID.
+
+36
+00:01:13,000 --> 00:01:15,000
+I will say group ID is com.telusko,
+
+37
+00:01:15,000 --> 00:01:18,000
+and the artifact ID, you can name anything you want,
+
+38
+00:01:18,000 --> 00:01:21,000
+but I will say SpringMVCDemo,
+
+39
+00:01:21,000 --> 00:01:23,000
+and nothing much, click on Finish.
+
+40
+00:01:23,000 --> 00:01:25,000
+This will give you a beautiful Maven project.
+
+41
+00:01:25,000 --> 00:01:27,000
+So by the time it is happening, what I will do is
+
+42
+00:01:27,000 --> 00:01:29,000
+I will go back to my download
+
+43
+00:01:29,000 --> 00:01:32,000
+and show you how your Tomcat folder looks like.
+
+44
+00:01:32,000 --> 00:01:34,000
+So this is the Tomcat which I'm using,
+
+45
+00:01:34,000 --> 00:01:38,000
+which is Apache Tomcat 10.1.16.
+
+46
+00:01:38,000 --> 00:01:40,000
+And in this you can see there are different folders.
+
+47
+00:01:40,000 --> 00:01:43,000
+One of the important folder is bin, because in this folder,
+
+48
+00:01:43,000 --> 00:01:46,000
+you will find the start and stop .sh.
+
+49
+00:01:46,000 --> 00:01:48,000
+This is how you basically run your Tomcat.
+
+50
+00:01:48,000 --> 00:01:49,000
+But do we really have to use this?
+
+51
+00:01:49,000 --> 00:01:51,000
+We'll see that in some time.
+
+52
+00:01:51,000 --> 00:01:53,000
+So looks like Maven is taking some time.
+
+53
+00:01:53,000 --> 00:01:55,000
+So my Eclipse just crashed. Let me just do that once again.
+
+54
+00:01:57,000 --> 00:01:59,000
+Click on Finish. It is creating the project.
+
+55
+00:01:59,000 --> 00:02:01,000
+So when it's creating the project, you can see it is asking
+
+56
+00:02:01,000 --> 00:02:04,000
+for the group ID, artifact ID, version, and package.
+
+57
+00:02:04,000 --> 00:02:07,000
+I will say yes, this is what I want to go for, and done.
+
+58
+00:02:07,000 --> 00:02:09,000
+You can see we have project is done,
+
+59
+00:02:09,000 --> 00:02:11,000
+which we can see our project section here
+
+60
+00:02:11,000 --> 00:02:12,000
+on the left hand side.
+
+61
+00:02:12,000 --> 00:02:14,000
+And this is your console, this is your outline.
+
+62
+00:02:14,000 --> 00:02:16,000
+We'll see later. Not needed now.
+
+63
+00:02:16,000 --> 00:02:18,000
+Okay, so this is the project which we got.
+
+64
+00:02:18,000 --> 00:02:20,000
+Now in this, if you open your pom.xml,
+
+65
+00:02:20,000 --> 00:02:23,000
+no where we are saying this is a Spring project.
+
+66
+00:02:23,000 --> 00:02:25,000
+So if you want this to work, we have to make sure
+
+67
+00:02:25,000 --> 00:02:28,000
+that you get your Spring dependencies here, okay?
+
+68
+00:02:28,000 --> 00:02:30,000
+Now why? I will show you in some time.
+
+69
+00:02:30,000 --> 00:02:31,000
+Let's see the folder structure.
+
+70
+00:02:31,000 --> 00:02:35,000
+So if you see, if you expand src, you have a main folder.
+
+71
+00:02:35,000 --> 00:02:38,000
+You don't have a Java folder here, that's weird.
+
+72
+00:02:38,000 --> 00:02:40,000
+And in this you have a webapp.
+
+73
+00:02:40,000 --> 00:02:43,000
+Inside this, you have index.jsp, which is this page.
+
+74
+00:02:43,000 --> 00:02:45,000
+And the good thing is we'll not be needing this JSP,
+
+75
+00:02:45,000 --> 00:02:47,000
+because we already have our two pages.
+
+76
+00:02:47,000 --> 00:02:50,000
+So I will delete this particular page here.
+
+77
+00:02:50,000 --> 00:02:52,000
+And if you go to the Java Resources,
+
+78
+00:02:52,000 --> 00:02:55,000
+you can see we don't have a java folder yet.
+
+79
+00:02:55,000 --> 00:02:57,000
+So what I will do is I will just go back to main,
+
+80
+00:02:57,000 --> 00:02:59,000
+and make sure that I create a java folder,
+
+81
+00:02:59,000 --> 00:03:02,000
+it's because I'll be putting my code there.
+
+82
+00:03:02,000 --> 00:03:04,000
+So you can see I got a java folder now,
+
+83
+00:03:04,000 --> 00:03:06,000
+and now from where you will get the code?
+
+84
+00:03:06,000 --> 00:03:09,000
+So first of all, even before we do any configuration,
+
+85
+00:03:09,000 --> 00:03:11,000
+let's get the code from our Spring Boot project
+
+86
+00:03:11,000 --> 00:03:15,000
+and put it here and let's see how it fails, okay?
+
+87
+00:03:15,000 --> 00:03:17,000
+So I will go back to my IDE,
+
+88
+00:03:17,000 --> 00:03:20,000
+and from here, we are going to get some files.
+
+89
+00:03:20,000 --> 00:03:21,000
+So first of all we'll get the files,
+
+90
+00:03:21,000 --> 00:03:23,000
+which is these three files.
+
+91
+00:03:23,000 --> 00:03:24,000
+In fact, we don't need the main code,
+
+92
+00:03:24,000 --> 00:03:27,000
+we just need Alien and HomeController.
+
+93
+00:03:27,000 --> 00:03:29,000
+So let's get that. Go back to Eclipse.
+
+94
+00:03:29,000 --> 00:03:31,000
+And in this you can see, we don't have a package yet.
+
+95
+00:03:31,000 --> 00:03:33,000
+So let me create a package first.
+
+96
+00:03:33,000 --> 00:03:36,000
+So in the java folder, I will have the same package name
+
+97
+00:03:36,000 --> 00:03:37,000
+which we were using earlier,
+
+98
+00:03:39,000 --> 00:03:44,000
+which is com.telusko.SpringMVCDemo.
+
+99
+00:03:44,000 --> 00:03:47,000
+Of course, we have different end package,
+
+100
+00:03:47,000 --> 00:03:48,000
+but the structure will be same.
+
+101
+00:03:48,000 --> 00:03:50,000
+So if we can see we don't have a package here.
+
+102
+00:03:50,000 --> 00:03:51,000
+So first of all, before copying this
+
+103
+00:03:51,000 --> 00:03:54,000
+or pasting this, we'll create a package.
+
+104
+00:03:54,000 --> 00:03:56,000
+So it's a New, Package,
+
+105
+00:03:56,000 --> 00:04:00,000
+and we'll name this package as com.telusko.SpringMVCDemo.
+
+106
+00:04:02,000 --> 00:04:03,000
+So you can see we've got our package here,
+
+107
+00:04:03,000 --> 00:04:06,000
+and it should also give the folder structure in this case.
+
+108
+00:04:06,000 --> 00:04:10,000
+Okay, now we can simply paste it in this. So paste.
+
+109
+00:04:10,000 --> 00:04:11,000
+And now you can see
+
+110
+00:04:11,000 --> 00:04:14,000
+you will have those two particular files there.
+
+111
+00:04:14,000 --> 00:04:16,000
+We got Alien, and we got HomeController.
+
+112
+00:04:17,000 --> 00:04:19,000
+Okay, nothing fancy, simple stuff,
+
+113
+00:04:19,000 --> 00:04:21,000
+but we just have to make sure
+
+114
+00:04:21,000 --> 00:04:25,000
+that we use a proper packaging now, which is SpringBootDemo,
+
+115
+00:04:25,000 --> 00:04:27,000
+I mean SpringMVCDemo, not boot, done.
+
+116
+00:04:27,000 --> 00:04:29,000
+So you can see we got the packages,
+
+117
+00:04:29,000 --> 00:04:31,000
+but if you go back to the HomeController,
+
+118
+00:04:31,000 --> 00:04:33,000
+there are lot of errors here.
+
+119
+00:04:33,000 --> 00:04:36,000
+And what are the errors? It says Jakarta not found, okay?
+
+120
+00:04:36,000 --> 00:04:38,000
+In fact, we don't even need this servlet code,
+
+121
+00:04:38,000 --> 00:04:39,000
+or do we have?
+
+122
+00:04:39,000 --> 00:04:43,000
+HttpServlet is used nowhere. We can remove that.
+
+123
+00:04:43,000 --> 00:04:45,000
+Next we want this Spring Framework.
+
+124
+00:04:45,000 --> 00:04:48,000
+And in this project we don't have Spring Framework.
+
+125
+00:04:48,000 --> 00:04:49,000
+So we'll do that in some time.
+
+126
+00:04:49,000 --> 00:04:52,000
+Next, I want to make sure that I get my JSP files.
+
+127
+00:04:52,000 --> 00:04:56,000
+So if you can see, we do have a webapp folder here, webapp.
+
+128
+00:04:56,000 --> 00:04:59,000
+Inside this, I want to paste my JSP files.
+
+129
+00:04:59,000 --> 00:05:03,000
+So if you can go back here, pick up the views folder itself
+
+130
+00:05:03,000 --> 00:05:04,000
+and paste in this webapp.
+
+131
+00:05:04,000 --> 00:05:06,000
+And you can see we got views here.
+
+132
+00:05:06,000 --> 00:05:08,000
+Some issue with the Eclipse, doesn't matter.
+
+133
+00:05:08,000 --> 00:05:10,000
+We'll see if this works or not.
+
+134
+00:05:10,000 --> 00:05:11,000
+But we ought to make sure,
+
+135
+00:05:11,000 --> 00:05:13,000
+I mean we have copied the important files, right?
+
+136
+00:05:13,000 --> 00:05:15,000
+Apart from this, there's no other file we have to copy.
+
+137
+00:05:15,000 --> 00:05:17,000
+Of course you can get CSS,
+
+138
+00:05:17,000 --> 00:05:19,000
+but in this particular section we'll skip CSS,
+
+139
+00:05:19,000 --> 00:05:21,000
+because it needs additional configuration.
+
+140
+00:05:21,000 --> 00:05:24,000
+And our motto is not to build beautiful UI here, right?
+
+141
+00:05:24,000 --> 00:05:27,000
+Our motto here is to build a better backend.
+
+142
+00:05:27,000 --> 00:05:28,000
+In the application.properties,
+
+143
+00:05:28,000 --> 00:05:29,000
+we don't have to set anything here,
+
+144
+00:05:29,000 --> 00:05:31,000
+because in the Spring MVC project,
+
+145
+00:05:31,000 --> 00:05:33,000
+we are not going to use property files.
+
+146
+00:05:33,000 --> 00:05:37,000
+We'll be using the old pattern of XML files, we'll use that.
+
+147
+00:05:37,000 --> 00:05:39,000
+Next we have to get the dependencies.
+
+148
+00:05:39,000 --> 00:05:42,000
+And you can see, here, we have used the Jasper
+
+149
+00:05:42,000 --> 00:05:47,000
+to convert the JSPs and we got the spring-boot-starter-web.
+
+150
+00:05:48,000 --> 00:05:50,000
+Anything else we need? Nothing.
+
+151
+00:05:50,000 --> 00:05:52,000
+But then we are not going to use the Spring Boot, right?
+
+152
+00:05:52,000 --> 00:05:54,000
+So what dependency I need?
+
+153
+00:05:54,000 --> 00:05:57,000
+So we need three dependencies first of all.
+
+154
+00:05:57,000 --> 00:05:59,000
+Depend upon which Tomcat version you're using.
+
+155
+00:05:59,000 --> 00:06:01,000
+If you are working with Tomcat 9,
+
+156
+00:06:01,000 --> 00:06:04,000
+you might not need the JSTL dependency.
+
+157
+00:06:04,000 --> 00:06:06,000
+But let's start with the first one.
+
+158
+00:06:06,000 --> 00:06:08,000
+The first dependency you need is Spring Framework,
+
+159
+00:06:08,000 --> 00:06:11,000
+but then Spring MVC, actually not framework.
+
+160
+00:06:11,000 --> 00:06:14,000
+So when you search for Spring MVC, this is what you need.
+
+161
+00:06:14,000 --> 00:06:16,000
+Spring Web MVC, click on this,
+
+162
+00:06:16,000 --> 00:06:19,000
+and you can get this one, 6.1.0,
+
+163
+00:06:19,000 --> 00:06:20,000
+depending on when you're watching this.
+
+164
+00:06:20,000 --> 00:06:24,000
+If you're watching after some time, pick up the second last
+
+165
+00:06:24,000 --> 00:06:27,000
+or third last one, which has a more usage.
+
+166
+00:06:27,000 --> 00:06:31,000
+So click on 6.1.0, get this dependency.
+
+167
+00:06:31,000 --> 00:06:33,000
+And in the Eclipse, make sure
+
+168
+00:06:33,000 --> 00:06:36,000
+that you go to your pom.xml file.
+
+169
+00:06:36,000 --> 00:06:39,000
+And inside this, just add this dependency.
+
+170
+00:06:39,000 --> 00:06:40,000
+So that's the first dependency we need,
+
+171
+00:06:40,000 --> 00:06:42,000
+which is for Spring MVC.
+
+172
+00:06:42,000 --> 00:06:45,000
+And the moment you do that in the Eclipse,
+
+173
+00:06:45,000 --> 00:06:49,000
+if you see the libraries here in the Maven Dependencies,
+
+174
+00:06:49,000 --> 00:06:51,000
+you will get all the Spring dependencies.
+
+175
+00:06:51,000 --> 00:06:51,000
+That's the first step.
+
+176
+00:06:51,000 --> 00:06:54,000
+And if you go back to HomeController,
+
+177
+00:06:54,000 --> 00:06:56,000
+you can see we don't have any errors now.
+
+178
+00:06:56,000 --> 00:06:58,000
+We got all the things which are needed.
+
+179
+00:06:58,000 --> 00:07:00,000
+Okay, that's good. So that's it.
+
+180
+00:07:00,000 --> 00:07:03,000
+You know, we got the pages, we got the Java code,
+
+181
+00:07:03,000 --> 00:07:05,000
+and we also got the dependency.
+
+182
+00:07:05,000 --> 00:07:06,000
+Let's see if this works,
+
+183
+00:07:06,000 --> 00:07:08,000
+and if it fails, let's see, how do we solve it?
+
+184
+00:07:08,000 --> 00:07:11,000
+But before running this, we have to make sure
+
+185
+00:07:11,000 --> 00:07:13,000
+that in your Eclipse we have a server.
+
+186
+00:07:13,000 --> 00:07:14,000
+Because when you try to run this,
+
+187
+00:07:14,000 --> 00:07:15,000
+how would you run this project?
+
+188
+00:07:15,000 --> 00:07:17,000
+If you say right click here, and Run As,
+
+189
+00:07:17,000 --> 00:07:19,000
+if you click on Run on Server,
+
+190
+00:07:19,000 --> 00:07:22,000
+we don't have a server here, we have to connect it.
+
+191
+00:07:22,000 --> 00:07:24,000
+So how do we do that? Simple step.
+
+192
+00:07:24,000 --> 00:07:27,000
+You can click on this no server,
+
+193
+00:07:27,000 --> 00:07:29,000
+but we'll see that in the next video,
+
+194
+00:07:29,000 --> 00:07:30,000
+how do you set up a Tomcat here.
+

13 - Exploring Web MVC without Spring Boot/002 Source-Code.url

@@ -0,0 +1,2 @@
+[InternetShortcut]
+URL=https://github.com/navinreddy20/spring6-course/tree/f1161e151ea06b68810b3cae03005d4955a96a8b/7%20Exploring%20Web%20MVC%20without%20Spring%20Boot/6.2%20Creating%20a%20Spring%20MVC%20Project_1

13 - Exploring Web MVC without Spring Boot/003 Running Tomcat in Eclipse_en.srt

@@ -0,0 +1,228 @@
+1
+00:00:00,000 --> 00:00:03,000
+(gentle music)
+
+2
+00:00:03,000 --> 00:00:04,000
+-: Now, let's see,
+
+3
+00:00:04,000 --> 00:00:06,000
+how do you set up a Tomcat in Eclipse
+
+4
+00:00:06,000 --> 00:00:08,000
+and how do you connect your project to that Tomcat?
+
+5
+00:00:08,000 --> 00:00:10,000
+So if you go to the Servers tabs here,
+
+6
+00:00:10,000 --> 00:00:12,000
+you can click on "No servers are available".
+
+7
+00:00:12,000 --> 00:00:13,000
+It will give you a prompt.
+
+8
+00:00:13,000 --> 00:00:14,000
+Now, we have to add a server.
+
+9
+00:00:14,000 --> 00:00:17,000
+Now you can select the server which you want to add.
+
+10
+00:00:17,000 --> 00:00:19,000
+This time we want to go for Tomcat.
+
+11
+00:00:19,000 --> 00:00:21,000
+So I will click on Apache and scroll down.
+
+12
+00:00:21,000 --> 00:00:24,000
+We are going for Tomcat v10.1, click next.
+
+13
+00:00:24,000 --> 00:00:27,000
+Now this is where you have to select a path
+
+14
+00:00:27,000 --> 00:00:29,000
+where you have your Tomcat downloaded.
+
+15
+00:00:29,000 --> 00:00:30,000
+If you don't have a downloaded version,
+
+16
+00:00:30,000 --> 00:00:33,000
+you can click on Download and install, even that works.
+
+17
+00:00:33,000 --> 00:00:35,000
+But I have a setup, so we click on browse.
+
+18
+00:00:35,000 --> 00:00:37,000
+And just navigate to Tomcat.
+
+19
+00:00:37,000 --> 00:00:40,000
+So basically search for this particular folder.
+
+20
+00:00:40,000 --> 00:00:41,000
+So I have it in my downloads.
+
+21
+00:00:41,000 --> 00:00:44,000
+You can just get it from the path, select the path,
+
+22
+00:00:44,000 --> 00:00:46,000
+and click on Next.
+
+23
+00:00:46,000 --> 00:00:47,000
+Do you want to, so it will ask you,
+
+24
+00:00:47,000 --> 00:00:49,000
+do you want to add any project to your Tomcat?
+
+25
+00:00:49,000 --> 00:00:52,000
+If you don't do that, so your Tomcat will run,
+
+26
+00:00:52,000 --> 00:00:53,000
+but not your project.
+
+27
+00:00:53,000 --> 00:00:57,000
+So we can shift our project inside this and click on Finish.
+
+28
+00:00:57,000 --> 00:01:00,000
+So now we have a Tomcat, which is in Stopped stage.
+
+29
+00:01:00,000 --> 00:01:03,000
+But if we expand this, we have a Spring project there.
+
+30
+00:01:03,000 --> 00:01:07,000
+And if you start this Tomcat, let's see if that works.
+
+31
+00:01:07,000 --> 00:01:08,000
+I will click on start.
+
+32
+00:01:08,000 --> 00:01:10,000
+Okay, it says it's already in use.
+
+33
+00:01:10,000 --> 00:01:14,000
+It's because in the IntelliJ, I have not stopped it.
+
+34
+00:01:14,000 --> 00:01:15,000
+We are using the same port number.
+
+35
+00:01:15,000 --> 00:01:17,000
+If you want to change the port number, you can do that.
+
+36
+00:01:17,000 --> 00:01:18,000
+But here I don't want to do that.
+
+37
+00:01:18,000 --> 00:01:20,000
+So I will just, you can see we have an icon here.
+
+38
+00:01:20,000 --> 00:01:22,000
+Restart the server, Relaunch.
+
+39
+00:01:22,000 --> 00:01:24,000
+Okay, we'll start it from here
+
+40
+00:01:25,000 --> 00:01:27,000
+and you can see the Tomcat started.
+
+41
+00:01:27,000 --> 00:01:29,000
+Okay, so that's good,
+
+42
+00:01:29,000 --> 00:01:30,000
+but now we have to run the project.
+
+43
+00:01:30,000 --> 00:01:32,000
+So I will just right-click here.
+
+44
+00:01:32,000 --> 00:01:34,000
+Say Run As, Run on Server.
+
+45
+00:01:34,000 --> 00:01:36,000
+We already have a Tomcat server here.
+
+46
+00:01:36,000 --> 00:01:40,000
+Click on Next, Finish, and boom.
+
+47
+00:01:40,000 --> 00:01:43,000
+So you can see, it has opened a browser for us.
+
+48
+00:01:43,000 --> 00:01:45,000
+I'll be using my own browser.
+
+49
+00:01:45,000 --> 00:01:49,000
+And the URL is localhost:8080, enter.
+
+50
+00:01:49,000 --> 00:01:50,000
+It's not working.
+
+51
+00:01:50,000 --> 00:01:51,000
+Something is not working.
+
+52
+00:01:51,000 --> 00:01:52,000
+Okay, what is that?
+
+53
+00:01:52,000 --> 00:01:55,000
+So let's search if it is working,
+
+54
+00:01:55,000 --> 00:01:56,000
+you can see it is not working.
+
+55
+00:01:56,000 --> 00:01:59,000
+It says "resource is not available".
+
+56
+00:01:59,000 --> 00:02:00,000
+Okay, so it is not working.
+
+57
+00:02:00,000 --> 00:02:03,000
+But why? Let's understand that in the next video.
+

13 - Exploring Web MVC without Spring Boot/003 Source-Code.url

@@ -0,0 +1,2 @@
+[InternetShortcut]
+URL=https://github.com/navinreddy20/spring6-course/tree/f1161e151ea06b68810b3cae03005d4955a96a8b/7%20Exploring%20Web%20MVC%20without%20Spring%20Boot/6.3%20Running%20Tomcat%20in%20Eclipse

13 - Exploring Web MVC without Spring Boot/004 Dispatcher Servlet_en.srt

@@ -0,0 +1,812 @@
+1
+00:00:00,000 --> 00:00:03,000
+(gentle music)
+
+2
+00:00:03,000 --> 00:00:06,000
+-: So, we have created this project off SpringMVC,
+
+3
+00:00:06,000 --> 00:00:07,000
+and that is a Maven project, right?
+
+4
+00:00:07,000 --> 00:00:09,000
+And then, when we were trying to run the project,
+
+5
+00:00:09,000 --> 00:00:10,000
+it is not working.
+
+6
+00:00:10,000 --> 00:00:12,000
+Now, mind you, we do have a controller.
+
+7
+00:00:12,000 --> 00:00:15,000
+So if you see the code, we do have a controller here,
+
+8
+00:00:15,000 --> 00:00:16,000
+which is HomeController.
+
+9
+00:00:16,000 --> 00:00:20,000
+And then, we do have a mapping for the homepage.
+
+10
+00:00:20,000 --> 00:00:22,000
+It should return the index.jsp,
+
+11
+00:00:22,000 --> 00:00:25,000
+but what you got here is not found.
+
+12
+00:00:25,000 --> 00:00:26,000
+What went wrong here?
+
+13
+00:00:26,000 --> 00:00:29,000
+See, the thing is, this is not a Spring Boot project.
+
+14
+00:00:29,000 --> 00:00:31,000
+This is a normal Maven project.
+
+15
+00:00:31,000 --> 00:00:34,000
+Now even if you added your Spring dependencies here,
+
+16
+00:00:34,000 --> 00:00:37,000
+your Maven has no idea that it has to call
+
+17
+00:00:37,000 --> 00:00:38,000
+this particular controller.
+
+18
+00:00:38,000 --> 00:00:40,000
+It's because in this Maven project,
+
+19
+00:00:40,000 --> 00:00:42,000
+which we are running on Tomcat,
+
+20
+00:00:42,000 --> 00:00:44,000
+now Tomcat being a Servlet Container,
+
+21
+00:00:44,000 --> 00:00:47,000
+it is responsible to run the servlets.
+
+22
+00:00:47,000 --> 00:00:49,000
+But then there has to be mapping, right?
+
+23
+00:00:49,000 --> 00:00:53,000
+So there have to be a mapping for a request and a servlet.
+
+24
+00:00:53,000 --> 00:00:54,000
+And we are not doing that.
+
+25
+00:00:54,000 --> 00:00:56,000
+Of course, we will say there is a controller,
+
+26
+00:00:56,000 --> 00:00:59,000
+but then your Tomcat has no idea.
+
+27
+00:00:59,000 --> 00:01:00,000
+The thing is, in Spring Framework,
+
+28
+00:01:00,000 --> 00:01:02,000
+we can have multiple controllers, right?
+
+29
+00:01:02,000 --> 00:01:04,000
+As I mentioned before, for different requests,
+
+30
+00:01:04,000 --> 00:01:05,000
+we'll be having different controllers.
+
+31
+00:01:05,000 --> 00:01:07,000
+And to navigate to different controllers,
+
+32
+00:01:07,000 --> 00:01:09,000
+we have our Front controllers.
+
+33
+00:01:09,000 --> 00:01:11,000
+So basically, you have a client,
+
+34
+00:01:11,000 --> 00:01:13,000
+and then you have a lot of controllers on the other side.
+
+35
+00:01:13,000 --> 00:01:15,000
+But when a client sends a request,
+
+36
+00:01:15,000 --> 00:01:17,000
+the request will not directly go to a particular controller.
+
+37
+00:01:17,000 --> 00:01:20,000
+The request will go to something called a Front controller.
+
+38
+00:01:20,000 --> 00:01:22,000
+Now, this sits in between.
+
+39
+00:01:22,000 --> 00:01:24,000
+And your Front controller is responsible
+
+40
+00:01:24,000 --> 00:01:26,000
+to send a particular request
+
+41
+00:01:26,000 --> 00:01:27,000
+to a particular controller.
+
+42
+00:01:27,000 --> 00:01:29,000
+So let's say if you request for the homepage,
+
+43
+00:01:29,000 --> 00:01:31,000
+it is a job of your Front controller to know
+
+44
+00:01:31,000 --> 00:01:32,000
+that I have a controller here
+
+45
+00:01:32,000 --> 00:01:35,000
+who can accept the request for the homepage.
+
+46
+00:01:35,000 --> 00:01:37,000
+Let's say you request for an addition of two numbers.
+
+47
+00:01:37,000 --> 00:01:38,000
+You are saying add.
+
+48
+00:01:38,000 --> 00:01:39,000
+Now, you have a controller there
+
+49
+00:01:39,000 --> 00:01:41,000
+who is responsible to add two numbers.
+
+50
+00:01:41,000 --> 00:01:43,000
+Now, your front controller will know that,
+
+51
+00:01:43,000 --> 00:01:45,000
+hey, we have a controller there who can add two numbers
+
+52
+00:01:45,000 --> 00:01:47,000
+with a request "add".
+
+53
+00:01:47,000 --> 00:01:48,000
+Now, this controller,
+
+54
+00:01:48,000 --> 00:01:50,000
+the Front controller in Spring Framework
+
+55
+00:01:50,000 --> 00:01:53,000
+is called a DispatcherServlet.
+
+56
+00:01:53,000 --> 00:01:56,000
+So this is the first servlet which you have to go to.
+
+57
+00:01:56,000 --> 00:01:59,000
+And then this will navigate to different controllers.
+
+58
+00:01:59,000 --> 00:02:01,000
+Now, in this project, we do have a controller,
+
+59
+00:02:01,000 --> 00:02:03,000
+but we don't have a DispatcherServlet.
+
+60
+00:02:03,000 --> 00:02:07,000
+Now, do we have to create our own DispatcherServlet? No.
+
+61
+00:02:07,000 --> 00:02:08,000
+Basically, Spring says,
+
+62
+00:02:08,000 --> 00:02:10,000
+don't worry, I do have a DispatcherServlet,
+
+63
+00:02:10,000 --> 00:02:11,000
+you just have to configure it.
+
+64
+00:02:11,000 --> 00:02:13,000
+So you have to tell your Tomcat,
+
+65
+00:02:13,000 --> 00:02:15,000
+hey, you know, every time you send a request,
+
+66
+00:02:15,000 --> 00:02:18,000
+send the request to the DispatcherServlet.
+
+67
+00:02:18,000 --> 00:02:19,000
+DispatcherServlet will take care
+
+68
+00:02:19,000 --> 00:02:21,000
+of the remaining operations.
+
+69
+00:02:21,000 --> 00:02:22,000
+Now, how will you configure that?
+
+70
+00:02:22,000 --> 00:02:25,000
+Now see, one of the file which goes,
+
+71
+00:02:25,000 --> 00:02:26,000
+I mean every time you run this project,
+
+72
+00:02:26,000 --> 00:02:29,000
+your Tomcat goes to one file,
+
+73
+00:02:29,000 --> 00:02:31,000
+which is the web.xml.
+
+74
+00:02:31,000 --> 00:02:32,000
+Now, this is where you have to mention,
+
+75
+00:02:32,000 --> 00:02:33,000
+hey, you know, when you send a request,
+
+76
+00:02:33,000 --> 00:02:36,000
+send request to this particular servlet.
+
+77
+00:02:36,000 --> 00:02:39,000
+And the way you do that is by providing two tags.
+
+78
+00:02:39,000 --> 00:02:43,000
+So basically the first tag is the servlet tag
+
+79
+00:02:43,000 --> 00:02:47,000
+and the second one is the servlet-mapping tag.
+
+80
+00:02:47,000 --> 00:02:49,000
+So basically, we have to use this too,
+
+81
+00:02:49,000 --> 00:02:51,000
+which is servlet tag and servlet-mapping tag.
+
+82
+00:02:51,000 --> 00:02:53,000
+Now, in this servlet mapping,
+
+83
+00:02:53,000 --> 00:02:57,000
+basically this is where you mention the url-pattern.
+
+84
+00:02:57,000 --> 00:02:59,000
+So you can say for all the requests,
+
+85
+00:02:59,000 --> 00:03:01,000
+doesn't matter what request we are getting.
+
+86
+00:03:01,000 --> 00:03:03,000
+For all the requests,
+
+87
+00:03:03,000 --> 00:03:05,000
+send the request to this particular servlet.
+
+88
+00:03:05,000 --> 00:03:07,000
+Now, which servlet I am talking about?
+
+89
+00:03:07,000 --> 00:03:10,000
+I'm talking about the DispatcherServlet.
+
+90
+00:03:10,000 --> 00:03:11,000
+Now, how do you get DispatcherServlet?
+
+91
+00:03:11,000 --> 00:03:13,000
+So, if you go to your dependency,
+
+92
+00:03:13,000 --> 00:03:14,000
+of course, I know the full name,
+
+93
+00:03:14,000 --> 00:03:16,000
+but if you want to know the full name,
+
+94
+00:03:16,000 --> 00:03:18,000
+even we can forgot that, right?
+
+95
+00:03:18,000 --> 00:03:20,000
+So if you expand your Maven Dependencies,
+
+96
+00:03:20,000 --> 00:03:22,000
+we see something called webmvc.
+
+97
+00:03:22,000 --> 00:03:24,000
+If you expand this,
+
+98
+00:03:24,000 --> 00:03:28,000
+there's something called "org.springframework.web.servlet."
+
+99
+00:03:28,000 --> 00:03:29,000
+And if you expand this,
+
+100
+00:03:29,000 --> 00:03:32,000
+you will find a DispatcherServlet here.
+
+101
+00:03:32,000 --> 00:03:34,000
+This is the class you have to use.
+
+102
+00:03:34,000 --> 00:03:38,000
+So I can simply copy the qualified name for it
+
+103
+00:03:38,000 --> 00:03:42,000
+and paste it here without the ".class" extension.
+
+104
+00:03:42,000 --> 00:03:42,000
+And that's done.
+
+105
+00:03:42,000 --> 00:03:44,000
+So what we are saying is,
+
+106
+00:03:44,000 --> 00:03:46,000
+every time someone sends a request for the url-mapping
+
+107
+00:03:46,000 --> 00:03:49,000
+or this particular URL, which is the homepage,
+
+108
+00:03:49,000 --> 00:03:52,000
+you have to call the DispatcherServlet.
+
+109
+00:03:52,000 --> 00:03:54,000
+In fact, not just the homepage, any request.
+
+110
+00:03:54,000 --> 00:03:56,000
+But then to map these two,
+
+111
+00:03:56,000 --> 00:03:57,000
+basically there are different tags, right?
+
+112
+00:03:57,000 --> 00:04:00,000
+Servlet and servlet-mapping are two different tags.
+
+113
+00:04:00,000 --> 00:04:01,000
+If you want to connect these two,
+
+114
+00:04:01,000 --> 00:04:03,000
+you have to add one more tag here,
+
+115
+00:04:03,000 --> 00:04:06,000
+which is your servlet-name.
+
+116
+00:04:06,000 --> 00:04:07,000
+Of course, you can name anything here.
+
+117
+00:04:07,000 --> 00:04:09,000
+I can say "dispatcher" or I can say "telusko".
+
+118
+00:04:09,000 --> 00:04:12,000
+Let's say I'm going for the servlet name as "telusko".
+
+119
+00:04:12,000 --> 00:04:14,000
+And here also, you have to do the same thing,
+
+120
+00:04:14,000 --> 00:04:16,000
+"<servlet-name>telusko".
+
+121
+00:04:16,000 --> 00:04:18,000
+You have to make sure these two are the same
+
+122
+00:04:18,000 --> 00:04:20,000
+because you can have multiple servlet tags
+
+123
+00:04:20,000 --> 00:04:21,000
+in this particular file
+
+124
+00:04:21,000 --> 00:04:23,000
+for different URL or mapping.
+
+125
+00:04:23,000 --> 00:04:26,000
+But at this point, I want to make sure that I only have one.
+
+126
+00:04:26,000 --> 00:04:30,000
+So for all of the requests, call the display servlet.
+
+127
+00:04:30,000 --> 00:04:33,000
+And to map these two, we have to use "telusko", "telusko".
+
+128
+00:04:33,000 --> 00:04:35,000
+Okay, now we have done the mapping.
+
+129
+00:04:35,000 --> 00:04:37,000
+Now we are saying, hey Tomcat,
+
+130
+00:04:37,000 --> 00:04:38,000
+every time you get a request,
+
+131
+00:04:38,000 --> 00:04:40,000
+send the request to the DispatcherServlet.
+
+132
+00:04:40,000 --> 00:04:43,000
+DispatcherServlet will take care of the other operations.
+
+133
+00:04:43,000 --> 00:04:45,000
+I hope this time this will work now.
+
+134
+00:04:45,000 --> 00:04:47,000
+Let's run this application.
+
+135
+00:04:47,000 --> 00:04:49,000
+You can see there is no problem.
+
+136
+00:04:49,000 --> 00:04:50,000
+Tomcat started.
+
+137
+00:04:50,000 --> 00:04:53,000
+So let me go to the browser and run.
+
+138
+00:04:53,000 --> 00:04:55,000
+Okay, I think I missed one more.
+
+139
+00:04:55,000 --> 00:04:56,000
+Let me just change the configuration,
+
+140
+00:04:56,000 --> 00:04:57,000
+this is still not working.
+
+141
+00:04:57,000 --> 00:04:58,000
+So I will go to the Build Path.
+
+142
+00:04:58,000 --> 00:05:02,000
+I'm not sure if it is accepting our Tomcat data.
+
+143
+00:05:02,000 --> 00:05:02,000
+We'll go to library.
+
+144
+00:05:02,000 --> 00:05:05,000
+Okay, so we have forgot to add the Tomcat library here.
+
+145
+00:05:05,000 --> 00:05:07,000
+So sometimes, if it doesn't work,
+
+146
+00:05:07,000 --> 00:05:09,000
+please check your Build Path.
+
+147
+00:05:09,000 --> 00:05:13,000
+So what I did, is I right-clicked on my project,
+
+148
+00:05:13,000 --> 00:05:14,000
+go to the Build Path.
+
+149
+00:05:14,000 --> 00:05:15,000
+And that's what, you know,
+
+150
+00:05:15,000 --> 00:05:17,000
+when you work with normal SpringMVC
+
+151
+00:05:17,000 --> 00:05:18,000
+or normal Spring Framework,
+
+152
+00:05:18,000 --> 00:05:19,000
+you have to do a lot of configuration.
+
+153
+00:05:19,000 --> 00:05:21,000
+And if you're thinking you'll be doing this every time,
+
+154
+00:05:21,000 --> 00:05:22,000
+not exactly.
+
+155
+00:05:22,000 --> 00:05:24,000
+This configuration will be done only once
+
+156
+00:05:24,000 --> 00:05:25,000
+when you start the project.
+
+157
+00:05:25,000 --> 00:05:26,000
+So click on library.
+
+158
+00:05:26,000 --> 00:05:29,000
+First of all, I will change my Java version to Java 21
+
+159
+00:05:29,000 --> 00:05:30,000
+because that's what I'm using.
+
+160
+00:05:30,000 --> 00:05:31,000
+Finish.
+
+161
+00:05:31,000 --> 00:05:35,000
+And then here, I want to add the Runtime as well.
+
+162
+00:05:35,000 --> 00:05:36,000
+Just on the safer side.
+
+163
+00:05:36,000 --> 00:05:38,000
+Click on Apply and Close.
+
+164
+00:05:38,000 --> 00:05:40,000
+Let's see if this works now.
+
+165
+00:05:40,000 --> 00:05:42,000
+Restart the server, go back, refresh.
+
+166
+00:05:42,000 --> 00:05:43,000
+Still not working.
+
+167
+00:05:43,000 --> 00:05:45,000
+Okay, so now when I'm running this,
+
+168
+00:05:45,000 --> 00:05:48,000
+there was some issue with the cashier or something.
+
+169
+00:05:48,000 --> 00:05:50,000
+So you can see when I run this now,
+
+170
+00:05:50,000 --> 00:05:51,000
+we got a different error.
+
+171
+00:05:51,000 --> 00:05:53,000
+So this time you're not getting 404.
+
+172
+00:05:53,000 --> 00:05:54,000
+That means it was able to find it.
+
+173
+00:05:54,000 --> 00:05:56,000
+We got a different error, which is the 500.
+
+174
+00:05:56,000 --> 00:05:59,000
+It says "Internal Server Error".
+
+175
+00:05:59,000 --> 00:06:01,000
+Now, if you read the error
+
+176
+00:06:01,000 --> 00:06:03,000
+and that's what you do when you get the errors, right?
+
+177
+00:06:03,000 --> 00:06:06,000
+So it says, if you see the Root Cause,
+
+178
+00:06:06,000 --> 00:06:09,000
+it says there is a problem with the IOException
+
+179
+00:06:09,000 --> 00:06:10,000
+with the XML file.
+
+180
+00:06:10,000 --> 00:06:12,000
+It's because it is not able to.
+
+181
+00:06:12,000 --> 00:06:16,000
+I mean, from this file, which is called telusko-servlet.xml.
+
+182
+00:06:16,000 --> 00:06:17,000
+Okay, now this is weird
+
+183
+00:06:17,000 --> 00:06:19,000
+because we don't even have this file
+
+184
+00:06:19,000 --> 00:06:21,000
+and if you go down it actually says
+
+185
+00:06:21,000 --> 00:06:23,000
+you don't have this file.
+
+186
+00:06:23,000 --> 00:06:25,000
+But why do we need this file?
+
+187
+00:06:25,000 --> 00:06:28,000
+I mean that's crazy, right? We got the DispatcherServlet.
+
+188
+00:06:28,000 --> 00:06:30,000
+It should send the request to DispatcherServlet.
+
+189
+00:06:30,000 --> 00:06:31,000
+And you know what?
+
+190
+00:06:31,000 --> 00:06:34,000
+It is actually sending the request to the DispatcherServlet.
+
+191
+00:06:34,000 --> 00:06:36,000
+But DispatcherServlet has its own problem.
+
+192
+00:06:36,000 --> 00:06:37,000
+DispatcherServlet says, if you want me to work,
+
+193
+00:06:37,000 --> 00:06:40,000
+and if you want me to understand different controllers
+
+194
+00:06:40,000 --> 00:06:43,000
+and mapping, you have to configure me.
+
+195
+00:06:43,000 --> 00:06:46,000
+Of course, we were expecting that the DispatcherServlet
+
+196
+00:06:46,000 --> 00:06:50,000
+will be a magician to know all the controllers, but not.
+
+197
+00:06:50,000 --> 00:06:51,000
+We have to configure that as well.
+
+198
+00:06:51,000 --> 00:06:53,000
+And how do you configure?
+
+199
+00:06:53,000 --> 00:06:55,000
+How do you talk to dispatch servlet?
+
+200
+00:06:55,000 --> 00:06:57,000
+And that's where we have to create this file,
+
+201
+00:06:57,000 --> 00:06:59,000
+which is telusko-servlet.
+
+202
+00:06:59,000 --> 00:07:00,000
+How do we do that?
+
+203
+00:07:00,000 --> 00:07:01,000
+Let's see in the next video.
+

13 - Exploring Web MVC without Spring Boot/004 Source-Code.url

@@ -0,0 +1,2 @@
+[InternetShortcut]
+URL=https://github.com/navinreddy20/spring6-course/tree/f1161e151ea06b68810b3cae03005d4955a96a8b/7%20Exploring%20Web%20MVC%20without%20Spring%20Boot/6.4%20Dispatcher%20Servlet

13 - Exploring Web MVC without Spring Boot/005 Configuring the DispatcherServlet_en.srt

@@ -0,0 +1,548 @@
+1
+00:00:00,000 --> 00:00:03,000
+(gentle music)
+
+2
+00:00:03,000 --> 00:00:06,000
+-: It's time to configure our DispatcherServlet.
+
+3
+00:00:06,000 --> 00:00:08,000
+And the way you do that, the way you talk
+
+4
+00:00:08,000 --> 00:00:10,000
+to a DispatcherServlet is with the help of this file.
+
+5
+00:00:10,000 --> 00:00:12,000
+See, there are multiple ways of doing this.
+
+6
+00:00:12,000 --> 00:00:15,000
+You can also use the Java based configuration
+
+7
+00:00:15,000 --> 00:00:18,000
+using annotations, but then we'll be using XML here,
+
+8
+00:00:18,000 --> 00:00:20,000
+just to understand what happens behind the scene.
+
+9
+00:00:20,000 --> 00:00:22,000
+Okay, so I will create this file.
+
+10
+00:00:22,000 --> 00:00:25,000
+So this is telusko-servlet.xml.
+
+11
+00:00:25,000 --> 00:00:27,000
+I will create this file. But then where?
+
+12
+00:00:27,000 --> 00:00:29,000
+The folder is /WEB-INF.
+
+13
+00:00:29,000 --> 00:00:31,000
+This is where it is expecting it to be.
+
+14
+00:00:31,000 --> 00:00:32,000
+That's the first thing.
+
+15
+00:00:32,000 --> 00:00:35,000
+Second, why it has this name, telusko-servlet?
+
+16
+00:00:35,000 --> 00:00:37,000
+Why not something else?
+
+17
+00:00:37,000 --> 00:00:41,000
+It's because if you look at your project, the name
+
+18
+00:00:41,000 --> 00:00:43,000
+of your servlet we are mentioning as telusko, right?
+
+19
+00:00:43,000 --> 00:00:46,000
+That's why it says telusko-servlet.
+
+20
+00:00:46,000 --> 00:00:48,000
+If you give a different name, let's say
+
+21
+00:00:48,000 --> 00:00:51,000
+if you give a name, t1, t2, or whatever you want to,
+
+22
+00:00:51,000 --> 00:00:55,000
+so it will be that, what the name, -servlet.xml.
+
+23
+00:00:55,000 --> 00:00:57,000
+And that's why we got that particular file.
+
+24
+00:00:57,000 --> 00:01:00,000
+So let's create the file. So I will just right click here.
+
+25
+00:01:00,000 --> 00:01:01,000
+And say, "Hey,
+
+26
+00:01:01,000 --> 00:01:06,000
+I want to create a new XML file," which is here.
+
+27
+00:01:06,000 --> 00:01:11,000
+Click on Next. Name this file, which is telusko-servlet.
+
+28
+00:01:11,000 --> 00:01:13,000
+And if you Enter, you got your file.
+
+29
+00:01:13,000 --> 00:01:15,000
+And now in this, we have to do the configuration.
+
+30
+00:01:15,000 --> 00:01:17,000
+Now what configuration I'm talking about?
+
+31
+00:01:17,000 --> 00:01:19,000
+See, basically we are not, we don't have
+
+32
+00:01:19,000 --> 00:01:22,000
+to actually manually mention each controller.
+
+33
+00:01:22,000 --> 00:01:26,000
+Reason being, we are using annotations here,
+
+34
+00:01:26,000 --> 00:01:28,000
+you can see we are doing the mapping here.
+
+35
+00:01:28,000 --> 00:01:29,000
+But what if you don't want to do mapping
+
+36
+00:01:29,000 --> 00:01:31,000
+in the controller or in the class?
+
+37
+00:01:31,000 --> 00:01:33,000
+In that case, in this particular file,
+
+38
+00:01:33,000 --> 00:01:34,000
+you have to do all the mapping.
+
+39
+00:01:34,000 --> 00:01:36,000
+For this request, call this particular method,
+
+40
+00:01:36,000 --> 00:01:39,000
+for this request, call this particular method.
+
+41
+00:01:39,000 --> 00:01:40,000
+And I don't wanna do that, right?
+
+42
+00:01:40,000 --> 00:01:42,000
+So we do have annotation there.
+
+43
+00:01:42,000 --> 00:01:45,000
+So we just have to mention to your DispatcherServlet
+
+44
+00:01:45,000 --> 00:01:47,000
+by saying, "Hey, you know, I'm using annotations
+
+45
+00:01:47,000 --> 00:01:49,000
+on the controllers, just use them."
+
+46
+00:01:49,000 --> 00:01:51,000
+And the way you can do that is
+
+47
+00:01:51,000 --> 00:01:52,000
+first of all, you can mention that "Hey, you know,"
+
+48
+00:01:52,000 --> 00:01:54,000
+you can say, "Hey, DispatcherServlet,"
+
+49
+00:01:54,000 --> 00:01:59,000
+I can say DS, "Find the classes in this package."
+
+50
+00:01:59,000 --> 00:02:00,000
+You can mention the package name.
+
+51
+00:02:00,000 --> 00:02:02,000
+That's the first thing you have to mention.
+
+52
+00:02:02,000 --> 00:02:06,000
+And second, you have to mention that I'm using annotations.
+
+53
+00:02:06,000 --> 00:02:11,000
+So you can say, "I'm using annotations," that's it.
+
+54
+00:02:11,000 --> 00:02:13,000
+DispatcherServlet will know that I have
+
+55
+00:02:13,000 --> 00:02:15,000
+to find this file in this package,
+
+56
+00:02:15,000 --> 00:02:16,000
+whatever package you mention here.
+
+57
+00:02:16,000 --> 00:02:19,000
+And then you are saying that I'm using annotations.
+
+58
+00:02:19,000 --> 00:02:20,000
+Will it work? Of course not.
+
+59
+00:02:20,000 --> 00:02:23,000
+You know, this is XML file, not a essay book, right?
+
+60
+00:02:23,000 --> 00:02:26,000
+This will not work, so this is not how you write a letter
+
+61
+00:02:26,000 --> 00:02:27,000
+to DispatcherServlet, okay?
+
+62
+00:02:27,000 --> 00:02:29,000
+But then we have to do the same thing.
+
+63
+00:02:29,000 --> 00:02:31,000
+For that, we have to use some tags.
+
+64
+00:02:31,000 --> 00:02:33,000
+And whenever you use tags in XML,
+
+65
+00:02:33,000 --> 00:02:36,000
+we have to also define those tags.
+
+66
+00:02:36,000 --> 00:02:39,000
+So for definition, I don't want to type it, everything,
+
+67
+00:02:39,000 --> 00:02:41,000
+because a lengthy file, so I do have a file with me.
+
+68
+00:02:41,000 --> 00:02:42,000
+You will find that in resources.
+
+69
+00:02:42,000 --> 00:02:45,000
+So this is the definition for those beans
+
+70
+00:02:45,000 --> 00:02:47,000
+or to those tags which you are going to use.
+
+71
+00:02:47,000 --> 00:02:51,000
+So let's end this. So this is what we wanted, right?
+
+72
+00:02:51,000 --> 00:02:53,000
+So this is the bean definition,
+
+73
+00:02:53,000 --> 00:02:57,000
+and now we can talk to the DispatcherServlet.
+
+74
+00:02:57,000 --> 00:02:59,000
+So the first thing you will mention is component scan.
+
+75
+00:02:59,000 --> 00:03:03,000
+Now you want to mention which package you have
+
+76
+00:03:03,000 --> 00:03:04,000
+to scan for the components.
+
+77
+00:03:04,000 --> 00:03:07,000
+So you will say ctx. So what is ctx here? Just context.
+
+78
+00:03:07,000 --> 00:03:11,000
+You can see we are defining the context definition as well.
+
+79
+00:03:11,000 --> 00:03:12,000
+So that's it, refer with ctx,
+
+80
+00:03:12,000 --> 00:03:14,000
+and that's what we are mentioning here.
+
+81
+00:03:14,000 --> 00:03:16,000
+So ctx:component-scan, and then the base package, you have
+
+82
+00:03:16,000 --> 00:03:20,000
+to mention the package name, which is com.telusko here.
+
+83
+00:03:20,000 --> 00:03:21,000
+You can be specific here,
+
+84
+00:03:21,000 --> 00:03:23,000
+you can mention the exact package name.
+
+85
+00:03:23,000 --> 00:03:27,000
+But com.telusko works. And that's the first thing.
+
+86
+00:03:27,000 --> 00:03:30,000
+Next you have to mention that you are using annotations.
+
+87
+00:03:30,000 --> 00:03:33,000
+And for that, you'll be using annotation-config.
+
+88
+00:03:33,000 --> 00:03:36,000
+In fact, you can also do a self-closing tags here
+
+89
+00:03:36,000 --> 00:03:37,000
+instead of typing everything.
+
+90
+00:03:37,000 --> 00:03:39,000
+That's it, these two things you have to mention
+
+91
+00:03:39,000 --> 00:03:42,000
+that you have to scan the package in this package.
+
+92
+00:03:42,000 --> 00:03:45,000
+And then you have to use,
+
+93
+00:03:45,000 --> 00:03:47,000
+I mean we are using annotation configuration, that's it.
+
+94
+00:03:47,000 --> 00:03:49,000
+Now this is how you talk to DispatcherServlet,
+
+95
+00:03:49,000 --> 00:03:52,000
+not by writing those two lines, but will this work?
+
+96
+00:03:52,000 --> 00:03:54,000
+Let's try it out. Of course we learn from the errors.
+
+97
+00:03:54,000 --> 00:03:56,000
+So I will just rerun this application,
+
+98
+00:03:56,000 --> 00:03:59,000
+and go back
+
+99
+00:03:59,000 --> 00:04:02,000
+to my code, run.
+
+100
+00:04:02,000 --> 00:04:04,000
+Okay, now this time we got a different error,
+
+101
+00:04:04,000 --> 00:04:06,000
+but at least every time we do something,
+
+102
+00:04:06,000 --> 00:04:08,000
+errors are changing, so that's a good thing, right?
+
+103
+00:04:08,000 --> 00:04:11,000
+But what is the problem now?
+
+104
+00:04:11,000 --> 00:04:13,000
+Is it the DispatcherServlet is not able to find?
+
+105
+00:04:13,000 --> 00:04:15,000
+Yes, DispatcherServlet was able
+
+106
+00:04:15,000 --> 00:04:17,000
+to find this particular file.
+
+107
+00:04:17,000 --> 00:04:20,000
+Now it knows that which package you have to scan,
+
+108
+00:04:20,000 --> 00:04:21,000
+which annotation you have to, I mean
+
+109
+00:04:21,000 --> 00:04:24,000
+we have been using annotation configuration, what's wrong?
+
+110
+00:04:24,000 --> 00:04:25,000
+And if you observe here,
+
+111
+00:04:25,000 --> 00:04:29,000
+in the console it says home method called,
+
+112
+00:04:29,000 --> 00:04:33,000
+which means it was able to call the controller.
+
+113
+00:04:33,000 --> 00:04:37,000
+So we have reached till here, but it's not going after that.
+
+114
+00:04:37,000 --> 00:04:39,000
+You know what's going wrong?
+
+115
+00:04:39,000 --> 00:04:44,000
+Let's go back to our page and it says 404. That's right.
+
+116
+00:04:44,000 --> 00:04:45,000
+But look at the message.
+
+117
+00:04:45,000 --> 00:04:48,000
+It says, no endpoint GET, for the GET request,
+
+118
+00:04:48,000 --> 00:04:51,000
+and the URL you're searching for is index.
+
+119
+00:04:51,000 --> 00:04:55,000
+Now from where we got index? Let's go back.
+
+120
+00:04:55,000 --> 00:04:58,000
+We are returning a index.
+
+121
+00:04:58,000 --> 00:05:01,000
+DispatcherServlet says, "You are telling me to call index.
+
+122
+00:05:01,000 --> 00:05:02,000
+But what is index?"
+
+123
+00:05:02,000 --> 00:05:04,000
+If you remember, when we were working
+
+124
+00:05:04,000 --> 00:05:08,000
+with this Spring Boot application, we did the same thing.
+
+125
+00:05:08,000 --> 00:05:10,000
+We are returning index there,
+
+126
+00:05:10,000 --> 00:05:13,000
+but in the property files we have mentioned
+
+127
+00:05:13,000 --> 00:05:16,000
+that you have to find the index in this particular folder,
+
+128
+00:05:17,000 --> 00:05:20,000
+and the extension for that index is .jsp.
+
+129
+00:05:20,000 --> 00:05:23,000
+Nowhere we are doing that in this particular project.
+
+130
+00:05:23,000 --> 00:05:26,000
+So that means you have to also configure the resolver.
+
+131
+00:05:26,000 --> 00:05:28,000
+Remember when I mentioned that, when you return this,
+
+132
+00:05:28,000 --> 00:05:31,000
+behind the scene, it uses something called a resolver.
+
+133
+00:05:31,000 --> 00:05:33,000
+So there's something called view resolver, or in full name,
+
+134
+00:05:33,000 --> 00:05:36,000
+it is called InternalResourceViewResolver.
+
+135
+00:05:36,000 --> 00:05:39,000
+So we have to configure that. Okay, how do we do that?
+
+136
+00:05:39,000 --> 00:05:42,000
+How do we configure the InternalResourceViewResolver?
+
+137
+00:05:42,000 --> 00:05:44,000
+Let's see that in the next video.
+

13 - Exploring Web MVC without Spring Boot/005 Source-Code.url

@@ -0,0 +1,2 @@
+[InternetShortcut]
+URL=https://github.com/navinreddy20/spring6-course/tree/f1161e151ea06b68810b3cae03005d4955a96a8b/7%20Exploring%20Web%20MVC%20without%20Spring%20Boot/6.5%20Configuring%20the%20DispatcherServlet

13 - Exploring Web MVC without Spring Boot/006 Internal Resource View Resolver_en.srt

@@ -0,0 +1,408 @@
+1
+00:00:00,000 --> 00:00:03,000
+(bright music)
+
+2
+00:00:03,000 --> 00:00:05,000
+-: Now it's time to configure
+
+3
+00:00:05,000 --> 00:00:08,000
+the Internal Resource View Resolver.
+
+4
+00:00:08,000 --> 00:00:09,000
+It's because when you return index here,
+
+5
+00:00:09,000 --> 00:00:12,000
+despite server has no idea where this index is
+
+6
+00:00:12,000 --> 00:00:14,000
+and what is extension for this, okay.
+
+7
+00:00:14,000 --> 00:00:17,000
+And the way you do that is again, go back to the the server
+
+8
+00:00:18,000 --> 00:00:20,000
+teluskoserver.xml because this is where you
+
+9
+00:00:20,000 --> 00:00:22,000
+talk to your dispatch satellite.
+
+10
+00:00:22,000 --> 00:00:26,000
+Now to configure that, we have to use a bean tag here.
+
+11
+00:00:26,000 --> 00:00:29,000
+So I have to say bean. Now, which bean I'm talking about?
+
+12
+00:00:29,000 --> 00:00:31,000
+So let's enter this. Now, which bean I'm talking about?
+
+13
+00:00:31,000 --> 00:00:34,000
+So there's something called internal resource resolver
+
+14
+00:00:34,000 --> 00:00:38,000
+and we have to mention the qualified path,
+
+15
+00:00:38,000 --> 00:00:40,000
+which is the full path for the class.
+
+16
+00:00:40,000 --> 00:00:41,000
+And the way you get that
+
+17
+00:00:41,000 --> 00:00:43,000
+is if you go back to Maven Dependencies
+
+18
+00:00:43,000 --> 00:00:44,000
+The same package.
+
+19
+00:00:44,000 --> 00:00:45,000
+Again, we have to go with this
+
+20
+00:00:45,000 --> 00:00:50,000
+org.springframework.web.servlet, but a different sub folder.
+
+21
+00:00:50,000 --> 00:00:53,000
+If you go down, you can see something called view.
+
+22
+00:00:53,000 --> 00:00:55,000
+And if you expand this, you will get the name,
+
+23
+00:00:55,000 --> 00:00:58,000
+which is Internal Resource View Resolver, which is this.
+
+24
+00:00:58,000 --> 00:01:02,000
+I will copy this name, qualified copy, qualified name.
+
+25
+00:01:02,000 --> 00:01:05,000
+And in this you have to mention the class equal to
+
+26
+00:01:05,000 --> 00:01:08,000
+and in the double codes, just mention
+
+27
+00:01:08,000 --> 00:01:10,000
+that without the class extension.
+
+28
+00:01:10,000 --> 00:01:11,000
+That's it.
+
+29
+00:01:11,000 --> 00:01:12,000
+This is how you mention that.
+
+30
+00:01:12,000 --> 00:01:15,000
+I'm going to configure the internal view resolver,
+
+31
+00:01:15,000 --> 00:01:17,000
+but you have to set two properties.
+
+32
+00:01:17,000 --> 00:01:20,000
+The first is prefix and the second is suffix.
+
+33
+00:01:20,000 --> 00:01:23,000
+So properties, and again we have used the same thing.
+
+34
+00:01:23,000 --> 00:01:27,000
+If you remember prefix suffix, let's set that.
+
+35
+00:01:27,000 --> 00:01:29,000
+So property is prefix.
+
+36
+00:01:29,000 --> 00:01:31,000
+The value is slash views slash
+
+37
+00:01:31,000 --> 00:01:33,000
+because that's a folder I think.
+
+38
+00:01:33,000 --> 00:01:36,000
+Let's see, yeah, the folder name is views.
+
+39
+00:01:36,000 --> 00:01:40,000
+And next we have to mention the property,
+
+40
+00:01:40,000 --> 00:01:43,000
+which is the suffix, which is in this case is .gsp.
+
+41
+00:01:43,000 --> 00:01:44,000
+That's it.
+
+42
+00:01:44,000 --> 00:01:47,000
+That's how basically you configure things
+
+43
+00:01:47,000 --> 00:01:49,000
+and now you know the importance of Spring Boot, right?
+
+44
+00:01:49,000 --> 00:01:52,000
+How easy it is to do everything in Spring Boot.
+
+45
+00:01:52,000 --> 00:01:56,000
+So now after making the changes, let's reload
+
+46
+00:01:56,000 --> 00:01:58,000
+or relaunch the application.
+
+47
+00:01:58,000 --> 00:02:01,000
+Let's go back and refresh.
+
+48
+00:02:01,000 --> 00:02:03,000
+Oh, and this time we got a different error.
+
+49
+00:02:03,000 --> 00:02:04,000
+Good thing, right?
+
+50
+00:02:04,000 --> 00:02:05,000
+Every time we do something you get
+
+51
+00:02:05,000 --> 00:02:07,000
+different error, but it looks like I made a mistake.
+
+52
+00:02:07,000 --> 00:02:10,000
+Line number 20. Let's see, line number 20.
+
+53
+00:02:10,000 --> 00:02:14,000
+It says perfect property things are looking good.
+
+54
+00:02:14,000 --> 00:02:17,000
+What is wrong there? Oh, this is not how you do it.
+
+55
+00:02:17,000 --> 00:02:19,000
+I still went into a different way.
+
+56
+00:02:19,000 --> 00:02:20,000
+So I have to set the value.
+
+57
+00:02:20,000 --> 00:02:22,000
+Remember in Spring Boot we have talked about the values.
+
+58
+00:02:22,000 --> 00:02:25,000
+I will say slash views slash,
+
+59
+00:02:25,000 --> 00:02:27,000
+and this should be also value.jsp.
+
+60
+00:02:27,000 --> 00:02:30,000
+Sometime you just go with the intuitions, right?
+
+61
+00:02:30,000 --> 00:02:32,000
+And then it doesn't work. Anyway.
+
+62
+00:02:32,000 --> 00:02:35,000
+So you have to set the values like this, not in the bracket.
+
+63
+00:02:35,000 --> 00:02:39,000
+Let's relaunch and go back here, relaunch the application
+
+64
+00:02:39,000 --> 00:02:41,000
+and voila, we got our page.
+
+65
+00:02:41,000 --> 00:02:43,000
+So this is working, but let's see
+
+66
+00:02:43,000 --> 00:02:45,000
+if the actual output also works.
+
+67
+00:02:45,000 --> 00:02:48,000
+So I will say 121.
+
+68
+00:02:48,000 --> 00:02:51,000
+And here I will say, Navin, enter, submit. And you got it.
+
+69
+00:02:51,000 --> 00:02:53,000
+You got the output. Not exactly,
+
+70
+00:02:53,000 --> 00:02:55,000
+I mean we have not seen this problem before,
+
+71
+00:02:55,000 --> 00:02:57,000
+but you can see we are not getting the value.
+
+72
+00:02:57,000 --> 00:02:59,000
+We wanted the value, which is data
+
+73
+00:02:59,000 --> 00:03:01,000
+and we wanted it to print.
+
+74
+00:03:01,000 --> 00:03:03,000
+Welcome to the Java world. What is not working?
+
+75
+00:03:03,000 --> 00:03:06,000
+Let's go back to our code.
+
+76
+00:03:06,000 --> 00:03:08,000
+And if you go to the home controller,
+
+77
+00:03:08,000 --> 00:03:12,000
+if you can see we do have this alien object here
+
+78
+00:03:13,000 --> 00:03:15,000
+and we are returning the result page.
+
+79
+00:03:15,000 --> 00:03:17,000
+And we do have the course model attribute,
+
+80
+00:03:17,000 --> 00:03:18,000
+which returns Java.
+
+81
+00:03:18,000 --> 00:03:20,000
+So it should work, right? See, sometime
+
+82
+00:03:20,000 --> 00:03:23,000
+what happens is in your JSP because of some,
+
+83
+00:03:25,000 --> 00:03:27,000
+because of some support, JSTL might not work.
+
+84
+00:03:27,000 --> 00:03:29,000
+So if you go back to result page, you have
+
+85
+00:03:29,000 --> 00:03:33,000
+to add one more attribute here, which is isELIgnored.
+
+86
+00:03:33,000 --> 00:03:35,000
+So you have to make sure this is always false
+
+87
+00:03:35,000 --> 00:03:37,000
+and you have to put that in double quotes.
+
+88
+00:03:37,000 --> 00:03:39,000
+So sometime the expression language,
+
+89
+00:03:39,000 --> 00:03:41,000
+so this is called the expression language
+
+90
+00:03:41,000 --> 00:03:43,000
+and sometime your framework ignores it.
+
+91
+00:03:43,000 --> 00:03:46,000
+So you have to make sure that you say, Hey, don't ignore it,
+
+92
+00:03:46,000 --> 00:03:48,000
+convert this value and let's see if this works.
+
+93
+00:03:48,000 --> 00:03:53,000
+Let's go back to the output page refresh. And it worked.
+
+94
+00:03:53,000 --> 00:03:55,000
+So that's how basically it works.
+
+95
+00:03:55,000 --> 00:03:58,000
+And we were able to convert our project,
+
+96
+00:03:58,000 --> 00:04:01,000
+the entire project from Spring Boot
+
+97
+00:04:01,000 --> 00:04:03,000
+to normal spring MVC without using Spring Boot of course.
+
+98
+00:04:03,000 --> 00:04:08,000
+And we have done a lot of configuration.
+
+99
+00:04:08,000 --> 00:04:10,000
+So let's do a quick recap in the next video.
+
+100
+00:04:10,000 --> 00:04:11,000
+Whatever we have done, step by step so
+
+101
+00:04:11,000 --> 00:04:13,000
+that you will remember what to do when you want
+
+102
+00:04:13,000 --> 00:04:15,000
+to build a Spring MBC application.
+

13 - Exploring Web MVC without Spring Boot/006 Source-Code.url

@@ -0,0 +1,2 @@
+[InternetShortcut]
+URL=https://github.com/navinreddy20/spring6-course/tree/f1161e151ea06b68810b3cae03005d4955a96a8b/7%20Exploring%20Web%20MVC%20without%20Spring%20Boot/6.6%20Internal%20Resource%20View%20Resolver

13 - Exploring Web MVC without Spring Boot/007 Summary_en.srt

@@ -0,0 +1,308 @@
+1
+00:00:00,000 --> 00:00:03,000
+(gentle music)
+
+2
+00:00:03,000 --> 00:00:05,000
+-: So let's do a quick recap of this app.
+
+3
+00:00:05,000 --> 00:00:07,000
+So what we have done is,
+
+4
+00:00:07,000 --> 00:00:08,000
+initially when you build this project,
+
+5
+00:00:08,000 --> 00:00:10,000
+you will get a Maven project.
+
+6
+00:00:10,000 --> 00:00:12,000
+You have to make sure that you add
+
+7
+00:00:12,000 --> 00:00:14,000
+this dependency for SpringMVC.
+
+8
+00:00:14,000 --> 00:00:17,000
+Now this is SpringMVC, not Spring Boot,
+
+9
+00:00:17,000 --> 00:00:19,000
+and the version I'm going for is 6.1.
+
+10
+00:00:19,000 --> 00:00:20,000
+Now. depending upon when you're watching this,
+
+11
+00:00:20,000 --> 00:00:22,000
+you can try out your own version.
+
+12
+00:00:22,000 --> 00:00:26,000
+And once we do this, we can create our controller.
+
+13
+00:00:26,000 --> 00:00:28,000
+So if you can see, I am creating a home controller here
+
+14
+00:00:28,000 --> 00:00:30,000
+in which I have different methods.
+
+15
+00:00:30,000 --> 00:00:32,000
+Of course, we are using annotations here for the mapping.
+
+16
+00:00:32,000 --> 00:00:34,000
+But then to make this work,
+
+17
+00:00:34,000 --> 00:00:37,000
+we have to make sure that you ask your Tomcat,
+
+18
+00:00:37,000 --> 00:00:40,000
+because Tomcat by default have no idea
+
+19
+00:00:40,000 --> 00:00:43,000
+that you are using a Spring project or SpringMVC project.
+
+20
+00:00:43,000 --> 00:00:45,000
+So you have to tell, "Hey, you know,
+
+21
+00:00:45,000 --> 00:00:47,000
+I want to use SpringMVC here."
+
+22
+00:00:47,000 --> 00:00:49,000
+And the first controller
+
+23
+00:00:49,000 --> 00:00:51,000
+or the first servlet you have to interact with
+
+24
+00:00:51,000 --> 00:00:53,000
+is a DispatcherServlet
+
+25
+00:00:53,000 --> 00:00:55,000
+which is given by the Spring Framework.
+
+26
+00:00:55,000 --> 00:00:59,000
+For all the requests, you have to call a DispatcherServlet.
+
+27
+00:00:59,000 --> 00:01:02,000
+That's what we are doing in the web.xml file.
+
+28
+00:01:02,000 --> 00:01:04,000
+Now, whom we are talking to using web.xml?
+
+29
+00:01:04,000 --> 00:01:05,000
+We are talking to Tomcat, okay?
+
+30
+00:01:05,000 --> 00:01:08,000
+So every file here is responsible for talking to something.
+
+31
+00:01:08,000 --> 00:01:11,000
+So web.xml is a way to talk to Tomcat.
+
+32
+00:01:11,000 --> 00:01:14,000
+And then when you call DispatcherServlet,
+
+33
+00:01:14,000 --> 00:01:15,000
+now DispatcherServlet has no idea
+
+34
+00:01:15,000 --> 00:01:16,000
+that you're using a controller.
+
+35
+00:01:16,000 --> 00:01:18,000
+Now, we have to talk to DispatcherServlet.
+
+36
+00:01:18,000 --> 00:01:21,000
+And the way you do that is using the DispatcherServlet name,
+
+37
+00:01:21,000 --> 00:01:24,000
+which is TELUSKO in this case, -servlet.xml.
+
+38
+00:01:24,000 --> 00:01:27,000
+This is our file which will be there in the WEB-INF folder.
+
+39
+00:01:27,000 --> 00:01:31,000
+In this, you have to mention that I am using annotations
+
+40
+00:01:31,000 --> 00:01:32,000
+using annotation-config.
+
+41
+00:01:32,000 --> 00:01:34,000
+And the package you will find all these classes
+
+42
+00:01:34,000 --> 00:01:36,000
+is com.telusko.
+
+43
+00:01:36,000 --> 00:01:38,000
+And then this basically knows that, hey,
+
+44
+00:01:38,000 --> 00:01:40,000
+I have to look at this controller,
+
+45
+00:01:40,000 --> 00:01:42,000
+I have to map it,
+
+46
+00:01:42,000 --> 00:01:44,000
+and then I have to call a particular page.
+
+47
+00:01:44,000 --> 00:01:46,000
+So like I'm calling the home method here,
+
+48
+00:01:46,000 --> 00:01:48,000
+which is calling "index".
+
+49
+00:01:48,000 --> 00:01:50,000
+So DispatcherServlet has no idea what "index" is.
+
+50
+00:01:50,000 --> 00:01:52,000
+So I have to mention the location of Index
+
+51
+00:01:52,000 --> 00:01:53,000
+and the extension.
+
+52
+00:01:53,000 --> 00:01:55,000
+The way you can do that
+
+53
+00:01:55,000 --> 00:01:57,000
+is with the help of Internal View Resolver,
+
+54
+00:01:57,000 --> 00:01:59,000
+which we have configured here.
+
+55
+00:01:59,000 --> 00:02:01,000
+So Internal Resource View Resolver.
+
+56
+00:02:01,000 --> 00:02:02,000
+In which you have to mention the prefix,
+
+57
+00:02:02,000 --> 00:02:04,000
+that means the location of the file,
+
+58
+00:02:04,000 --> 00:02:06,000
+and the extension for the file, which is suffix,
+
+59
+00:02:06,000 --> 00:02:08,000
+and that is your .jsp.
+
+60
+00:02:08,000 --> 00:02:11,000
+And that's how the entire project is working.
+
+61
+00:02:11,000 --> 00:02:13,000
+So again, you have to do this configuration,
+
+62
+00:02:13,000 --> 00:02:15,000
+but remember, for a big project,
+
+63
+00:02:15,000 --> 00:02:17,000
+you will do this configuration only once.
+
+64
+00:02:17,000 --> 00:02:20,000
+As you add more features, you have to do more configuration.
+
+65
+00:02:20,000 --> 00:02:21,000
+But again, remember,
+
+66
+00:02:21,000 --> 00:02:22,000
+you will do this configuration only once
+
+67
+00:02:22,000 --> 00:02:24,000
+for the entire project.
+
+68
+00:02:24,000 --> 00:02:26,000
+So is it worth building project in SpringMVC?
+
+69
+00:02:26,000 --> 00:02:28,000
+Yes, you get more controls.
+
+70
+00:02:28,000 --> 00:02:30,000
+And is it worth building project in Spring Boot?
+
+71
+00:02:30,000 --> 00:02:31,000
+Yes, if it will save your time.
+
+72
+00:02:31,000 --> 00:02:34,000
+So it depends upon what kind of project you're building.
+
+73
+00:02:34,000 --> 00:02:37,000
+I have seen projects also built in normal SpringMVC,
+
+74
+00:02:37,000 --> 00:02:38,000
+without Spring Boot.
+
+75
+00:02:38,000 --> 00:02:40,000
+But most of the projects are using Spring Boot.
+
+76
+00:02:40,000 --> 00:02:44,000
+So after this, we'll add some more features into Spring,
+
+77
+00:02:44,000 --> 00:02:46,000
+but with the help of Spring Boot.
+

13 - Exploring Web MVC without Spring Boot/external-links.txt

@@ -0,0 +1,15 @@
+
+002 Source-Code
+https://github.com/navinreddy20/spring6-course/tree/f1161e151ea06b68810b3cae03005d4955a96a8b/7%20Exploring%20Web%20MVC%20without%20Spring%20Boot/6.2%20Creating%20a%20Spring%20MVC%20Project_1
+
+003 Source-Code
+https://github.com/navinreddy20/spring6-course/tree/f1161e151ea06b68810b3cae03005d4955a96a8b/7%20Exploring%20Web%20MVC%20without%20Spring%20Boot/6.3%20Running%20Tomcat%20in%20Eclipse
+
+004 Source-Code
+https://github.com/navinreddy20/spring6-course/tree/f1161e151ea06b68810b3cae03005d4955a96a8b/7%20Exploring%20Web%20MVC%20without%20Spring%20Boot/6.4%20Dispatcher%20Servlet
+
+005 Source-Code
+https://github.com/navinreddy20/spring6-course/tree/f1161e151ea06b68810b3cae03005d4955a96a8b/7%20Exploring%20Web%20MVC%20without%20Spring%20Boot/6.5%20Configuring%20the%20DispatcherServlet
+
+006 Source-Code
+https://github.com/navinreddy20/spring6-course/tree/f1161e151ea06b68810b3cae03005d4955a96a8b/7%20Exploring%20Web%20MVC%20without%20Spring%20Boot/6.6%20Internal%20Resource%20View%20Resolver

14 - Building a Project/001 Building Job App_en.srt

@@ -0,0 +1,296 @@
+1
+00:00:00,000 --> 00:00:03,000
+(bright music)
+
+2
+00:00:03,000 --> 00:00:04,000
+-: With whatever we have learned 'til now,
+
+3
+00:00:04,000 --> 00:00:07,000
+basically we have talked about Spring, Spring Boot,
+
+4
+00:00:07,000 --> 00:00:09,000
+and we also know how do you build a web application
+
+5
+00:00:09,000 --> 00:00:10,000
+with the help of Spring framework.
+
+6
+00:00:10,000 --> 00:00:12,000
+Now, when you talk about web application
+
+7
+00:00:12,000 --> 00:00:15,000
+and if you try to build a view
+
+8
+00:00:15,000 --> 00:00:16,000
+inside your Spring project as well,
+
+9
+00:00:16,000 --> 00:00:18,000
+we can do that with the help of JSP.
+
+10
+00:00:18,000 --> 00:00:20,000
+And that's what we have done 'til now, right?
+
+11
+00:00:20,000 --> 00:00:22,000
+Now on that, let's build an application.
+
+12
+00:00:22,000 --> 00:00:25,000
+Now what we are building, we are building a job application,
+
+13
+00:00:25,000 --> 00:00:27,000
+or you can say a job portal,
+
+14
+00:00:27,000 --> 00:00:29,000
+where people can, or companies can post
+
+15
+00:00:29,000 --> 00:00:31,000
+about a particular job.
+
+16
+00:00:31,000 --> 00:00:35,000
+And then as a job seeker, you can search for a job.
+
+17
+00:00:35,000 --> 00:00:37,000
+So this is what we are building here.
+
+18
+00:00:37,000 --> 00:00:38,000
+So let's say if you are searching for a job
+
+19
+00:00:38,000 --> 00:00:40,000
+and then you want to see
+
+20
+00:00:40,000 --> 00:00:41,000
+what are the different jobs available,
+
+21
+00:00:41,000 --> 00:00:43,000
+or the the requirements,
+
+22
+00:00:43,000 --> 00:00:45,000
+you can simply click on View All Jobs here.
+
+23
+00:00:45,000 --> 00:00:48,000
+And this will list the number of jobs available.
+
+24
+00:00:48,000 --> 00:00:51,000
+You can see they're looking for Java developers
+
+25
+00:00:51,000 --> 00:00:53,000
+with the experience in core Java, advanced Java,
+
+26
+00:00:53,000 --> 00:00:56,000
+experience two years, and then the tech stack.
+
+27
+00:00:56,000 --> 00:00:58,000
+Then we have front developer, three years.
+
+28
+00:00:58,000 --> 00:01:02,000
+Now all these are just data which we randomly inserted,
+
+29
+00:01:02,000 --> 00:01:03,000
+but it doesn't matter, right?
+
+30
+00:01:03,000 --> 00:01:04,000
+We got this data here,
+
+31
+00:01:04,000 --> 00:01:07,000
+and now if you want to apply for a job,
+
+32
+00:01:07,000 --> 00:01:08,000
+you can see a particular thing.
+
+33
+00:01:08,000 --> 00:01:09,000
+And of course there should be a button here
+
+34
+00:01:09,000 --> 00:01:10,000
+for applying a job.
+
+35
+00:01:10,000 --> 00:01:12,000
+And also there should be a company name.
+
+36
+00:01:12,000 --> 00:01:13,000
+But just to keep it simple,
+
+37
+00:01:13,000 --> 00:01:15,000
+we went for these different profiles here.
+
+38
+00:01:15,000 --> 00:01:16,000
+That's one.
+
+39
+00:01:16,000 --> 00:01:20,000
+Next, what if you are an employer,
+
+40
+00:01:20,000 --> 00:01:21,000
+and you want to post about a job?
+
+41
+00:01:21,000 --> 00:01:22,000
+So you can click on this Add Job
+
+42
+00:01:22,000 --> 00:01:24,000
+and you can post a requirement.
+
+43
+00:01:24,000 --> 00:01:26,000
+Of course this should be auto-generated,
+
+44
+00:01:26,000 --> 00:01:27,000
+but at this point,
+
+45
+00:01:27,000 --> 00:01:29,000
+let's say we have some hardware values there,
+
+46
+00:01:29,000 --> 00:01:30,000
+and then we have a post profile.
+
+47
+00:01:30,000 --> 00:01:35,000
+Let's say we are looking for a Spring dev
+
+48
+00:01:35,000 --> 00:01:36,000
+and some requirement,
+
+49
+00:01:36,000 --> 00:01:38,000
+let's say experience of one year in Spring.
+
+50
+00:01:38,000 --> 00:01:42,000
+And I want the person to know Java,
+
+51
+00:01:42,000 --> 00:01:44,000
+and there should be Spring as well here.
+
+52
+00:01:44,000 --> 00:01:45,000
+And I'm not able to find.
+
+53
+00:01:45,000 --> 00:01:47,000
+Let's say I want someone who knows Java and TypeScript.
+
+54
+00:01:47,000 --> 00:01:49,000
+I will click on Submit and we got an error.
+
+55
+00:01:49,000 --> 00:01:52,000
+Not expected, but it should bring something, right?
+
+56
+00:01:52,000 --> 00:01:54,000
+So there's something wrong with the code.
+
+57
+00:01:54,000 --> 00:01:55,000
+Again, we'll figure it out, and we'll make it work,
+
+58
+00:01:55,000 --> 00:01:57,000
+but it should add the job.
+
+59
+00:01:57,000 --> 00:01:59,000
+And when you go back to View All Jobs,
+
+60
+00:01:59,000 --> 00:02:00,000
+of course it should be there, right?
+
+61
+00:02:00,000 --> 00:02:02,000
+This is what we want to build now.
+
+62
+00:02:02,000 --> 00:02:04,000
+It's not complete, and that's why we got the error.
+
+63
+00:02:04,000 --> 00:02:05,000
+But let's build this.
+
+64
+00:02:05,000 --> 00:02:07,000
+Now, how we are going to start this?
+
+65
+00:02:07,000 --> 00:02:09,000
+Of course, we don't want to focus on the views here
+
+66
+00:02:09,000 --> 00:02:11,000
+because there are a lot of CSS involved here.
+
+67
+00:02:11,000 --> 00:02:13,000
+So I have the view theories.
+
+68
+00:02:13,000 --> 00:02:15,000
+We want to build the backend, okay?
+
+69
+00:02:15,000 --> 00:02:17,000
+So in the next video I will show you
+
+70
+00:02:17,000 --> 00:02:19,000
+how we have built that view.
+
+71
+00:02:19,000 --> 00:02:20,000
+In fact, we'll create the project first,
+
+72
+00:02:20,000 --> 00:02:23,000
+and then we'll add some views which I've already created,
+
+73
+00:02:23,000 --> 00:02:25,000
+and we'll see how those views looks like.
+
+74
+00:02:25,000 --> 00:02:28,000
+And then we'll start coding the Java part of it.
+