Spring @Controller Annotation with Example

Spring Core Annotations

Spring @Controller example project:

Here's a basic example of a Spring MVC project with a controller annotated with @Controller.

// MyController.java
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class MyController {

    @RequestMapping("/hello")
    public String hello() {
        return "hello";
    }
}

Creating controllers with @Controller annotation in Spring:

Create controllers in Spring by annotating a class with @Controller and defining request mapping methods.

// MyController.java
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class MyController {

    @RequestMapping("/welcome")
    public String welcome() {
        return "welcome";
    }
}

Handling requests with @Controller in Spring framework:

Use the @Controller annotation to handle HTTP requests in a Spring MVC application.

// MyController.java
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class MyController {

    @RequestMapping("/greet")
    public String greet() {
        return "greet";
    }
}

Mapping URLs to controller methods using @Controller in Spring:

Map specific URLs to controller methods using the @RequestMapping annotation.

// MyController.java
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class MyController {

    @RequestMapping("/custom-url")
    public String handleCustomURL() {
        return "customPage";
    }
}

Request handling and response in Spring @Controller:

Handle requests and customize responses in a Spring @Controller by defining appropriate methods.

// MyController.java
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
public class MyController {

    @RequestMapping("/json-response")
    @ResponseBody
    public String jsonResponse() {
        return "{'message': 'Hello, JSON!'}";
    }
}

Working with ModelAndView in Spring @Controller:

Use ModelAndView to work with models and views in a Spring @Controller.

// MyController.java
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

@Controller
public class MyController {

    @RequestMapping("/model-view")
    public ModelAndView modelView() {
        ModelAndView modelAndView = new ModelAndView("myView");
        modelAndView.addObject("message", "Hello, ModelAndView!");
        return modelAndView;
    }
}

Customizing request mappings with @Controller in Spring:

Customize request mappings in a Spring @Controller by specifying URL patterns and handling different HTTP methods.

// MyController.java
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
@RequestMapping("/custom-mappings")
public class MyController {

    @GetMapping("/get-request")
    public String handleGetRequest() {
        return "getMapping";
    }

    @PostMapping("/post-request")
    public String handlePostRequest() {
        return "postMapping";
    }
}