What is the DispatcherServlet?

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In Spring MVC, the DispatcherServlet is the central front controller that handles all incoming HTTP requests and routes them to the appropriate components. When a request arrives, the web server (like Tomcat) forwards it to the DispatcherServlet, which then:

  1. Receives the request and matches it with a handler (controller method) using HandlerMapping.

  2. Calls the controller method to process the request.

  3. Handles data binding & validation if needed.

  4. Selects a view (via ViewResolver) or prepares a response body (for REST APIs).

  5. Returns the response to the client.

In Spring Boot, the DispatcherServlet is auto-configured and mapped to "/" by default. You don’t need to register it manually.

Key point: It acts as the traffic controller in the Spring MVC architecture, ensuring requests are processed efficiently and consistently.

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