获取 HTTP 状态 406 - 尝试在 Spring REST 控制器中返回对象时出现不可接受的错误

Question

这里我正在尝试更新一个对象并在 Spring REST 控制器中以 JSON 格式返回更新后的对象。

控制器：

@RequestMapping(value = "/user/revert", method = RequestMethod.POST)
@Produces(javax.ws.rs.core.MediaType.APPLICATION_JSON)
public ResponseEntity<UserResponse> revertUserData(@RequestParam(value = "userName") String userName) {

    User user = new User();
    UserResponse userResponse = new UserResponse();

    try {
        user = userService.findUserByName(userName);
        user.setLastName(null);

        userResponse.setEmail(user.getEmail());
        userResponse.setLastName(user.getLastName());

    } catch (Exception e) {
        return new ResponseEntity<UserResponse>(userResponse, HttpStatus.INTERNAL_SERVER_ERROR);
    }
    return new ResponseEntity<UserResponse>(userResponse, HttpStatus.OK);

}

用户响应类：

@JsonInclude(JsonInclude.Include.NON_NULL)
public class UserResponse {

  @JsonProperty("email")
  private String email;
  @JsonProperty("lastName")
  private String lastName;

  //getter and setter methids 

}

pom 文件：

    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
        <version>2.4.1</version>
    </dependency>

我得到的错误：

The target resource does not have a current representation that would be acceptable to the
user agent, according to the proactive negotiation header fields received in the request, and the server is
unwilling to supply a default representation.

Answer 1

您混合了 JAX-RS 和 Spring MVC 注释：@RequestMapping 来自 Spring，@Produces 来自 JAX-RS。如果您查看@RequestMapping 的documentation，您会发现它有一个produces 参数。所以你应该有类似的东西：

@RequestMapping(value = "/user/revert", method = RequestMethod.POST, produces = MediaType.APPLICATION_JSON)
public ResponseEntity<UserResponse> revertUserData(@RequestParam(value = "userName") String userName){
...
}