Spring Boot @RestController没有响应

Question

I'm starting with Spring and REST application. Currently, I'm developing one application on my own and I stuck.

The app is divided just like standard Spring Boot project. All of the controllers are contained in web package. One of "standard" controller is responsible for handling HTTP request and returning an HTML website. I have added a REST controller which should respond to POST request from the first controller, but I receive a 404 error.

How it looks like in code?

@RestController
@RequestMapping("/users")
public class UserRestController {
    @Autowired
    private UserService userService;


    @RequestMapping(value = "/user", method = RequestMethod.POST,  consumes = "application/json", produces = "application/json")
    public ResponseEntity<?> getUser(@RequestParam("userId") String userId, Errors errors) {
        AjaxUser response = new AjaxUser();

        if (errors.hasErrors()) {
            response.message = errors.getAllErrors().stream().map(x -> x.getDefaultMessage()).collect(Collectors.joining(","));

            return ResponseEntity.badRequest().body(response);

        }

        response.setUser(userService.getUserById(Integer.getInteger(userId).intValue()));

        return ResponseEntity.ok(response);

    }

    private class AjaxUser {
        private User user;
        private String message;

        public void setUser(User user) {
            this.user = user;
        }

        public void setMessage(String message) {
            this.message = message;
        }

        public String getMessage() {
            return message;
        }

        @Override
        public String toString() {
            return "User { id:" + user.getId() + ", Name: " + user.getName() + ", surname: " + user.getSurname() + "}";
        }
    }
}

From .js file I send a ajax query which should trigger a rest controller, here is the code:

function sendUserId(id) {
    var user = {};
    user["userId"] = id;

    console.log("USER: ", user);

    $.ajax({
        type: "POST",
        contentType: "application/json",
        url: "/users/user",
        data: JSON.stringify(user),
        dataType: 'json',
        cache: false,
        timeout: 100000,
        success: function (user) {

            var json = "<h4>Ajax Response</h4><pre>"
                + JSON.stringify(user, null, 4) + "</pre>";

            console.log("SUCCESS : ", user);

        },
        error: function (e) {

            var json = "<h4>Ajax Response</h4><pre>"
                + e.responseText + "</pre>";

            console.log("ERROR : ", e);
        }
    });
}

userId is taken from a html by jQuery, console.log show existing and right value.

Note: There exist a standard user @Controller which is responsible for displaying a user list, it works, problem appear during sending a user id to REST controller. It behaves just like the REST controller doesn't exist and browser return 404 status response . Btw, page use a Spring Secure to login and so on.

Could someone help?

BR Konrad

Answer 1

控制器正在寻找js请求网址中缺少的请求参数

/users/user?userId=1

Answer 2

You can get a user by id like below:

@RequestMapping(value = "{id}", method = RequestMethod.GET)
public ResponseEntity<User> get(@PathVariable("id") int id) {
User user = userService.findById(id);

if (user == null) {
return new ResponseEntity<User>(HttpStatus.NOT_FOUND);
}

return new ResponseEntity<User>(user, HttpStatus.OK);
}

So your rest entry point is /users/userid, eg: /users/1

Found this from the post Spring MVC RESTFul Web Service CRUD Example

Answer 3

the problem based on function arguments, REST controller should take String argument and next parse it to JSON object, the response should be String too. Topic can be closed, thanks all to be involved.