Spring MVC - @ResponseBody Examples

@Controller
public class MyWebController {

    @RequestMapping("/")
    public
    @ResponseBody
    Callable<String> handleRequest (HttpServletRequest r) {
        System.out.println("asyncSupported: " + r.isAsyncSupported());
        System.out.println(Thread.currentThread().getName());

        return new Callable<String>() {
            @Override
            public String call () throws Exception {
                System.out.println(Thread.currentThread().getName());
                return "some string";
            }
        };
    }
}

import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.stereotype.Controller;
import org.springframework.util.MultiValueMap;
import org.springframework.web.bind.annotation.*;


@Controller
@RequestMapping("message")
public class MyController {

    @GetMapping(consumes = MediaType.TEXT_PLAIN_VALUE,
            produces = MediaType.TEXT_PLAIN_VALUE)
    @ResponseBody
    public String handleRequest(@RequestBody byte[] bytes) {
        //We can replace byte[] with String above

        System.out.println("body in bytes: " + bytes);
        System.out.println("body in string: " + new String(bytes));

        return "Hi there";
    }


    @RequestMapping(method = RequestMethod.POST, consumes = MediaType
            .APPLICATION_FORM_URLENCODED_VALUE)
    @ResponseStatus(HttpStatus.OK)
    @ResponseBody
    public String handleFormRequest(@RequestBody
                                    MultiValueMap<String, String> formParams) {
        System.out.println("form params received " + formParams);
        return "name: " + formParams.get("name").get(0);
    }

    @RequestMapping(method = RequestMethod.PUT,
            consumes = MediaType.APPLICATION_FORM_URLENCODED_VALUE)
    @ResponseStatus(HttpStatus.CREATED)
    @ResponseBody
    public String handleFormPutRequest(@RequestBody
                                     MultiValueMap<String, String> formParams) {
        System.out.println("form params received " + formParams);
        return "name: "+formParams.get("name").get(0);
    }

}

    @RequestMapping(method = RequestMethod.GET,
                        produces = MediaType.APPLICATION_XML_VALUE)
    @ResponseStatus(HttpStatus.OK)
    @ResponseBody
    public UserList getAllUserRequest () {
        UserList list = new UserList();
        list.setUsers(userService.getAllUsers());
        return list;
    }

    @RequestMapping(method = RequestMethod.GET,
                        produces = MediaType.APPLICATION_JSON_VALUE)
    @ResponseStatus(HttpStatus.OK)
    @ResponseBody
    public List<User> handleAllUserRequest () {
        return userService.getAllUsers();
    }

    @RequestMapping(method = RequestMethod.GET,
                        produces = MediaType.APPLICATION_JSON_VALUE)
    @ResponseStatus(HttpStatus.OK)
    @ResponseBody
    public List<User> handleAllUserRequest () {
        return userService.getAllUsers();
    }