How To Configure The Interceptor With Spring Boot Application? | Spring Boot - Interceptor

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Understanding Spring Boot Interceptors

If you have ever wanted to run a piece of code before your request hits the controller or after the response is sent back, you are in the right place! In Spring Boot, this is exactly what Interceptors are for.

What is a Handler Interceptor?

A Handler Interceptor allows you to intercept incoming HTTP requests and outgoing responses. Think of it like a specialized checkpoint that only cares about your application's controllers.

While they might sound similar to Filters, Interceptors are more deeply integrated with Spring's MVC framework, giving you more context about which controller or method is being called.

The Three Key Methods

Interceptors give you three main "hooks" to use:

• preHandle(): Runs before the controller. You can use this to check things like login status.
• postHandle(): Runs after the controller finishes, but before the view is rendered.
• afterCompletion(): Runs after everything is done—perfect for cleaning up or logging performance.

Quick Code Example

To create one, you implement the HandlerInterceptor interface:

@Component
public class MyInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(...) {
        System.out.println("Pre-Handle logic executed!");
        return true;
    }
}

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