Can you explain what the @Controller annotation signifies in the context of web development?

The @Controller annotation in Java web development is used within the Spring Framework to denote a class that handles HTTP requests and returns responses.

Main points:

• A class with @Controller is considered an MVC (Model-View-Controller) component.
• It accepts requests from clients, processes them, and returns a model and view name for rendering.
• Methods inside the class are usually annotated with @RequestMapping or similar to specify which URLs they handle.

Example:

@Controller
public class MyController {

    @RequestMapping("/hello")
    public String sayHello(Model model) {
        model.addAttribute("message", "Hello, world!");
        return "helloView"; // view name
    }
}

Here, when accessing /hello, the sayHello method is invoked, which adds data to the model and returns the view name for display to the user.

Thus, @Controller helps define controllers that manage the flow of data between the model and view in a web application.