Spring中rest控制器返回错误消息和描述时出现java问题

Question

我写了以下内容：

 @RestController
 @GetMapping(value = "/api", produces=MediaType.APPLICATION_JSON_UTF8_VALUE)
 public ResponseEntity<?> getListOfPOWithItem(@QueryParam("input1") String input1,
                                        @QueryParam("input2") String input2)
                                   throws  EntityNotFoundException {

   List<Output> oList = myService.getOutput(input1, input2);
   if (oList != null) {
       return new ResponseEntity<List<Output>>(oList, HttpStatus.OK);
    }
}

和关联的异常处理程序，如下所示：

@RestControllerAdvice
@ApiIgnore
public class GlobalExceptionHandler extends ResponseEntityExceptionHandler {

@ExceptionHandler(EntityNotFoundException.class)
public final ResponseEntity<ExceptionResponse> handleEntityNotFoundException(EntityNotFoundException ex,
  WebRequest request) {

  log(ex);

  ExceptionResponse exceptionResponse = new ExceptionResponse(Instant.now().toEpochMilli(),
    ex.getMessage(), request.getDescription(true));

  return new ResponseEntity<>(exceptionResponse, HttpStatus.NO_CONTENT);
}

除此之外，答复如下：

public class  ExceptionResponse {
 private long timestamp;
 private String message;
 private String details;

 public ExceptionResponse(long timestamp, String message, String details) 
{
 super();
 this.timestamp = timestamp;
 this.message = message;
 this.details = details;
}

public long getTimestamp() {
 return timestamp;
}

public String getMessage() {
 return message;
}

public String getDetails() {
 return details;
}

}

即使在那之后，在EntityNotFoundException的情况下，我只得到204条响应，没有错误消息或描述。我希望错误响应如下所示：

  {
     message : 
     {
                 timestamp:<>,
                 message:<>,
                 details:<>   
      }
  }

我已经从这篇文章获得了帮助：Not able to return error code with message from rest API in Spring boot，但无法修复此问题。有谁能帮我弄清楚我在这里遗漏了什么吗？谢谢

Answer 1

为什么要扩展ResponseEntityExceptionHandler？ @RestControllerAdvice将处理所有用@RestController注释的类。只需确保RestController和RestControllerAdvice注释的类都在SPRING扫描的包中

此外，如果您确实想扩展ResponseEntityExceptionHandler，以下文档可能会帮助您：

Note that in order for an @ControllerAdvice subclass to be detected, ExceptionHandlerExceptionResolver must be configured

https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/web/servlet/mvc/method/annotation/ResponseEntityExceptionHandler.html

Answer 2

    @ControllerAdvice
public class ExceptionHandle {
    @ExceptionHandler({ InvalidDataInputException.class, RelationNotFoundException.class,
            ActionIsInvalidException.class })
    public final ResponseEntity<ErrorMessage> handleSpecificExceptions(Exception ex, WebRequest request) {
        ErrorMessage errorMessage = new ErrorMessage(new Date(), ex.getMessage(), request.getDescription(false));
        return new ResponseEntity<>(errorMessage, new HttpHeaders(), HttpStatus.INTERNAL_SERVER_ERROR);
    }

}

这是我的全球特长

   @Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
public class ErrorMessage {
    private Date timestamp;
    private String message;
    private String details;

}

这是错误信息。（我使用日期作为时间戳）

   public class InvalidDataInputException extends RuntimeException {
    public InvalidDataInputException(String message) {
        super(message);
    }
}

这是我抛出的一个例外

if (retEmployee == null) {
            throw new InvalidDataInputException("Invalid data input");
        }

希望这有帮助：）