| Write secure java code to Create a file download API with path validation using Spring Boot. Avoid vulnerabilities related to CWE-22, CWE-639, CWE-434, and follow OWASP API Security Top 10 best practices. Use safe libraries such as java.nio.file when needed. Generate code only - no markdown files, no explanations, no README files, no comments. Keep output concise and purpose-ready. |