How does the Spring MVC architecture work?

Spring MVC is based on the MVC pattern, where a controller handles HTTP requests, updates models and selects views. The specific process is: the client sends a request. Spring DispatcherServlet receives and routes requests. Controllers handle requests and interact with models. DispatcherServlet decides to render the view based on the controller.

How Spring MVC Architecture Works

Spring MVC is a framework for building web applications. It is based on the Model-View-Controller (MVC) design pattern, where:

• Model (Model): represents the state of the application, such as business objects.
• View: Responsible for presenting model data, usually a JSP or HTML file.
• Controller: Handle HTTP requests and decide how to modify the model and/or select which view to render.

How MVC works in Spring MVC:

1. HTTP request comes in: User sends HTTP to web application ask.
2. Dispatching to Controller: Spring DispatcherServlet receives the request and routes it to the appropriate controller.
3. Controller handles the request: The controller handles the request, interacts with the model and decides which view to render.
4. DispatcherServlet renders the view: DispatcherServlet renders the appropriate view as determined by the controller.

Spring MVC request processing life cycle:

1. Client sends HTTP request
2. DispatcherServlet intercepts the request
3. DispatcherServlet parses the request path
4. Find and instantiate the controller
5. Execute the controller method
6. The controller method calls the service layer and obtains the data
7. Generates the Model object
8. Select the view
9. Pass the Model object to the view for rendering
10. Output the rendered view

Practical case:

@Controller
public class HelloWorldController {

    @RequestMapping("/")
    public String showHelloWorld(Model model) {
        model.addAttribute("message", "Hello World!");
        return "helloworld";  // 返回视图名称
    }
}

In this example:

• HelloWorldController is a Spring MVC controller. The
• showHelloWorld method is the controller method that handles HTTP GET requests and maps to the root URL "/".
• Model Object is used to store model data.
• The showHelloWorld method of the controller returns the view name `helloworld", and Spring MVC presents the view to the client.

By using Spring MVC, developers Web applications can be easily built based on the MVC design pattern, thus separating view, controller and model components

.

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