Yes, in Spring Boot, you can add a custom filter to your web application using the @Component and @Order annotations.
Here’s an example of how you can create a custom filter:
1. Create a new class and annotate it with @Component to mark it as a Spring bean.
@Component
public class CustomFilter implements Filter {
// Implement the methods of the Filter interface
}2. Implement the methods of the javax.servlet.Filter interface in your custom filter class.
@Component
public class CustomFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
// Initialization logic
}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
// Filter logic
chain.doFilter(request, response);
}
@Override
public void destroy() {
// Cleanup logic
}
}
3. Use the @Order annotation to specify the order in which the filter should be applied. Lower numbers are processed first.
@Component
@Order(1)
public class CustomFilter implements Filter {
// Implement the methods of the Filter interface
}
4. Spring Boot will automatically register your custom filter with the servlet container, and it will be applied to all incoming requests.
Note that you can also use the @WebFilter annotation instead of @Component to define a filter class. The @WebFilter annotation is a standard Java EE annotation, but it works in Spring Boot as well.
