spring rest 处理空请求体(400 Bad Request) [英] spring rest Handling empty request body (400 Bad Request)

问题描述

我正在使用 Spring4 开发 RESTful 应用程序.我想处理 POST 请求不包含正文的情况.我编写了以下自定义异常处理程序:

I am developing a RESTful app using Spring4. I want to handle the case when a POST request contains no body. I wrote the following custom exception handler:

    @ControllerAdvice
    public class MyRestExceptionHandler {
     
      @ExceptionHandler
      @ResponseStatus(HttpStatus.BAD_REQUEST)
      public ResponseEntity<MyErrorResponse> handleJsonMappingException(JsonMappingException ex) {
          MyErrorResponse errorResponse = new MyErrorResponse("request has empty body");
          return new ResponseEntity<MyErrorResponse>(errorResponse, HttpStatus.BAD_REQUEST);
      }   
      @ExceptionHandler(Throwable.class)
      public ResponseEntity<MyErrorResponse> handleDefaultException(Throwable ex) {
        MyErrorResponse errorResponse = new MyErrorResponse(ex);
        return new ResponseEntity<MyErrorResponse>(errorResponse, HttpStatus.BAD_REQUEST);
      }
    }
    
     @RestController
     public class ContactRestController{
        @RequestMapping(path="/contact", method=RequestMethod.POST)
        public void save(@RequestBody ContactDTO contactDto) {...}
     } 

当它收到一个没有正文的 POST 时，不会调用这些方法.反而，客户端收到带有 400 BAD REQUEST HTTP 状态和空正文的响应.有人知道怎么处理吗?

When it receives a POST with no body, these methods aren't called. Instead, the client gets a response with 400 BAD REQUEST HTTP status and empty body. Does anybody know how to handle it?

推荐答案

我解决了这个问题(自定义异常处理程序必须扩展 ResponseEntityExceptionHandler).我的解决方案如下:

I solved the issue (the custom exception handler must extend ResponseEntityExceptionHandler). My solution follows:

        @ControllerAdvice
        public class RestExceptionHandler extends ResponseEntityExceptionHandler {
    
            @Override
            protected ResponseEntity<Object> handleHttpMessageNotReadable(
                HttpMessageNotReadableException ex, HttpHeaders headers,
                HttpStatus status, WebRequest request) {
                // paste custom hadling here
            }
        }

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