Snippet

Intercepting Requests with HandlerInterceptor

A HandlerInterceptor allows you to execute logic before or after a request reaches a controller. This is ideal for logging, authentication checks, or adding common headers without cluttering controller methods.

snippet.java

java

@Component
public class RequestLoggingInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {
        System.out.println("Incoming request: " + request.getMethod() + " " + request.getRequestURI());
        return true;
    }
 
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) {
        System.out.println("Request processed successfully");
    }
}

spring

Breakdown

preHandle

Executes before the controller method; returns false to block the request.

postHandle

Executes after the controller method but before view rendering.

HttpServletRequest

Provides access to headers, parameters, and HTTP methods.

Previous snippet Next snippet

More Intermediate Java exercises →

Intercepting Requests with HandlerInterceptor

Related