javascript - 当我尝试将 JSON 发送到 Spring 时，不支持内容类型 'application/json;charset=UTF-8'

Question

当我将 JSON 包从 jQuery 发送到 Spring RestController 时，出现了很多错误:

Spring :

Resolved [org.springframework.web.HttpMediaTypeNotSupportedException: Content type 'application/json;charset=UTF-8' not supported]

在 Chrome 中:

POST http://localhost/post 415

(anonymous) @ main.js:11

我的 jQuery 代码:

$(document).ready(function() {

$('#go').on('click', function() {

    var user = {
        "name" : "Tom",
        "age" : 23
    };

    $.ajax({
        type: 'POST',
        url: "http://localhost/post",
        contentType: 'application/json; charset=utf-8',
        data: JSON.stringify(user),
        dataType: 'json',
        async: true
    });

   });

 });

我的 Spring RestController 代码:

@RestController
public class mainController {
@RequestMapping(value = "/post", method = RequestMethod.POST,
        consumes = MediaType.APPLICATION_FORM_URLENCODED_VALUE,
        produces = {MediaType.APPLICATION_JSON_UTF8_VALUE})
public ResponseEntity<Object> postUser(@RequestBody User user){
System.out.println(user);
return new ResponseEntity<>("Success", HttpStatus.OK);
}

@RequestMapping(value = "/get", method = RequestMethod.GET)
public User getStr(){
    System.out.println("-------------------------");
    return new User("Tom", 56); //'Get' Check
}

}

实体用户:

@Data
@ToString
@NoArgsConstructor
@AllArgsConstructor
public class User {
  private String name;
  private int age;
}

Answer 1

您使用了错误的媒体类型，即 APPLICATION_FORM_URLENCODED_VALUE 在 rest conttroller 中使用。在传递 json 请求时使用 MediaType.APPLICATION_JSON_UTF8_VALUE。

@RestController
public class mainController {
@RequestMapping(value = "/post", method = RequestMethod.POST,
        consumes = MediaType.APPLICATION_JSON,
        produces = {MediaType.APPLICATION_JSON_UTF8_VALUE})
public ResponseEntity<Object> postUser(@RequestBody User user){
System.out.println(user);
return new ResponseEntity<>("Success", HttpStatus.OK);
}

@RequestMapping(value = "/get", method = RequestMethod.GET)
public User getStr(){
    System.out.println("-------------------------");
    return new User("Tom", 56); //'Get' Check
}

}