java - Spring Boot HttpMessageNotReadableException

Question

我有这个类来代表用户:

@JsonInclude(JsonInclude.Include.NON_NULL)
@JsonIgnoreProperties(ignoreUnknown = true)
@Getter
@Setter
public class UserDto implements Serializable {
    private Long id;
    private String username;
    private String email;
    private String password;
    private Collection<? extends GrantedAuthority> roles;

    public UserDto() {
    }
}

}

我想做的是让Spring将下面 Controller 的@RequestBody映射到UserDto:

public class AuthController {
    @Autowired
    private UserService userService;
    @Autowired
    private AuthService authService;

    @RequestMapping(value = "signup", method = RequestMethod.POST)
    public ResponseEntity<?> addUser(@RequestBody UserDto userDto) throws Exception {
        UserDto existingUserDto;

        try {
            existingUserDto = userService.save(userDto);
        } catch (Exception e) {
            return new ResponseEntity<>(e.getMessage(), HttpStatus.INTERNAL_SERVER_ERROR);
        }
        return new ResponseEntity<>(existingUserDto, HttpStatus.CREATED);
    }
}

但是当我尝试发送 Post 请求时，我从 Spring 收到以下错误:

Failed to read HTTP message:                 org.springframework.http.converter.HttpMessageNotReadableException: Could not read document: Unrecognized token 'username': was expecting ('true', 'false' or 'null')
 at [Source: java.io.PushbackInputStream@2c477da6; line: 1, column: 10]; nested exception is com.fasterxml.jackson.core.JsonParseException: Unrecognized token 'username': was expecting ('true', 'false' or 'null')
 at [Source: java.io.PushbackInputStream@2c477da6; line: 1, column: 10]

我试图做的是声明一个自定义 MappingJackson2HttpMessageConverter 但我没有得到任何不同的结果

@Bean
    public MappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter() {
        MappingJackson2HttpMessageConverter jsonConverter = new MappingJackson2HttpMessageConverter();
        ObjectMapper objectMapper = new ObjectMapper();
        objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        jsonConverter.setObjectMapper(objectMapper);
        return jsonConverter;
    } 

这是我正在执行的请求的屏幕(内容类型:application/json):

PostMan Request

你有什么想法吗？

Answer 1

能否将您的 Controller 方法 @RequestMapping 更改为以下内容。

@RequestMapping(value = "", method = RequestMethod.POST, produces = { MediaType.APPLICATION_JSON_UTF8_VALUE })

此外，您不需要添加自定义 MappingJackson2HttpMessageConverter 来完成此操作。还要确保您的 Controller 中注释了正确的请求映射。

@Controller
@RequestMapping("/api/users")

同时删除模型类中的以下注释。向所有属性添加 getter 和 setter，同时保留默认构造函数。

@JsonInclude(JsonInclude.Include.NON_NULL)
@JsonIgnoreProperties(ignoreUnknown = true)
@Getter
@Setter

希望这有帮助。快乐编码!