How to implement web request handling using Spring MVC?

In Spring MVC, web request processing is implemented through controllers that accept HTTP requests and return responses.

Main steps:

1. Create a class with the @Controller or @RestController annotation.
2. Use the @RequestMapping annotation (or specialized ones like @GetMapping, @PostMapping) to specify the URL and HTTP method.
3. In controller methods, accept request parameters and return data or views.

Example controller:

@RestController
public class HelloController {

    @GetMapping("/hello")
    public String sayHello(@RequestParam(name = "name", defaultValue = "World") String name) {
        return "Hello, " + name + "!";
    }
}

In this example, a GET request to /hello?name=Ivan will return the string "Hello, Ivan!".