在body exception spring rest添加新字段

Question

我想在我的Rest Spring Boot应用程序中处理异常。我知道使用@ControllerAdvice和ResponseEntity我可以返回一个表示错误的自定义对象，但我想要的是在exesting异常的主体中添加一个新字段，仅此而已。

@ResponseStatus(HttpStatus.CONFLICT)
public class CustomException extends RuntimeException {

    private List<String> errors = new ArrayList<>();

    public CustomException(List<String> errors) {
        this.errors = errors;
    }

    public CustomException(String message) {
        super(message);
    }

    public CustomException(String message, List<String> errors) {
        super(message);
        this.errors = errors;
    }

    public List<String> getErrors() {
        return errors;
    }

    public void setErrors(List<String> errors) {
        this.errors = errors;
    }
}

在我的控制器中，我只是这样抛出这个自定义异常：

@GetMapping("/appointment")
public List<Appointment> getAppointments() {
    List<String> errors = new ArrayList<>();
    errors.add("Custom message");
    throw new CustomException("This is my message", errors);
}

当我用postman测试我的Restendpoint时，似乎spring boot没有整理我的错误字段，响应是：

{
  "timestamp": "2017-06-05T18:19:03",
  "status": 409,
  "error": "Conflict",
  "exception": "com.htech.bimaristan.utils.CustomException",
  "message": "This is my message",
  "path": "/api/agenda/appointment"
}

如果我可以从异常获得“path”和“timestamp”字段，那么我可以使用@ControllerAdvice获得一个自定义对象，但这两个属性没有getter。

Answer 1

嗯！下面是DefaultErrorAttributes中“path”和“timestamp”的实现，您也可以在自定义实现中这样做：

路径：

String path = getAttribute(requestAttributes, "javax.servlet.error.request_uri");
if (path != null) {
    errorAttributes.put("path", path);
}

时间戳：

errorAttributes.put("timestamp", new Date());

@Bean
public ErrorAttributes errorAttributes() {
    return new DefaultErrorAttributes() {
        @Override
        public Map<String, Object> getErrorAttributes(RequestAttributes requestAttributes, boolean includeStackTrace) {
            Map<String, Object> errorAttributes = super.getErrorAttributes(requestAttributes, includeStackTrace);
            // customize here
            return errorAttributes;
        }

   };
}

@Component
public class CustomErrorAttributes extends DefaultErrorAttributes {

    @Override
    public Map<String, Object> getErrorAttributes(RequestAttributes requestAttributes, boolean includeStackTrace) {
        Map<String, Object> errorAttributes = super.getErrorAttributes(requestAttributes, includeStackTrace);
        // customize here
        return errorAttributes;
    }
}

{
   "timestamp": 1413883870237,
   "status": 500,
   "error": "Internal Server Error",
   "exception": "org.example.ServiceException",
   "message": "somthing goes wrong",
   "path": "/index"
}

可以使用@exceptionhandler自定义“exception”属性。@controleradvice可用于跨控制器通用地自定义异常。要在控制器级别进行自定义，可以将它们放置在控制器中。

在您的情况下：

   @ResponseStatus(value=HttpStatus.BAD_REQUEST, reason="Invalid Inputs")
    @ExceptionHandler(CustomException.class)
    private void errorHanlder() {
        //Log exception
    }


  public Map<String, Object> getErrorAttributes(RequestAttributes requestAttributes, boolean includeStackTrace) {
    Map<String, Object> errorAttributes = super.getErrorAttributes(requestAttributes, includeStackTrace);
    Throwable error = getError(requestAttributes);
    if (error instanceof CustomException) {
        errorAttributes.put("errorList", ((CustomException)error).getErrors());
    }
    return errorAttributes;
}