gre*_*Dev 3 rest spring exception-handling http-status-code-404
我正在使用Spring(4.0.4)MVC来构建RESTful API.我需要返回一个ResponseEntity,其中包含一个错误的JSON表示,其中http状态为404.
但是,当我发出导致404的请求而不是看到错误JSON时,我得到以下输出:
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>404 Not Found</title>
</head><body>
<h1>Not Found</h1>
<p>The requested URL /project/api/resource/100 was not found on this server.</p>
<p>Additionally, a 503 Service Temporarily Unavailable
error was encountered while trying to use an ErrorDocument to handle the request.</p>
</body></html>
从这个stackoverflow帖子,我发现我可以通过在我的web.xml中包含以下参数来防止发送此错误页面代替错误
<init-param>
<param-name>throwExceptionIfNoHandlerFound</param-name>
<param-value>true</param-value>
</init-param>
并使用类似于此的全局建议:
@ControllerAdvice
public class MyExceptionHandler extends ResponseEntityExceptionHandler {
@ExceptionHandler(NoHandlerFoundException.class)
@ResponseStatus(value = HttpStatus.NOT_FOUND)
@ResponseBody
public ResponseEntity<ErrorResponse> requestHandlingNoHandlerFound(HttpServletRequest req,
NoHandlerFoundException ex) {
ErrorResponse errorResponse = new ErrorResponse();
errorResponse.setText("error response");
return new ResponseEntity<ErrorResponse>(errorResponse, HttpStatus.BAD_REQUEST);
}
}
但是,当我添加此MyExceptionHandler类时,我收到以下异常:
Caused by: java.lang.IllegalStateException: Ambiguous @ExceptionHandler method mapped for [class org.springframework.web.servlet.NoHandlerFoundException]: {public org.springframework.http.ResponseEntity com.rest.MyExceptionHandler.requestHandlingNoHandlerFound
问题是它不知道是否要调用我的自定义ExceptionHandler或web.servlet中定义的那个.
如何解决此问题,以便我能够使用Spring从API返回JSON？
这就是我的想法:
你的@ControllerAdvice类扩展ResponseEntityExceptionHandler有一个方法handleNoHandlerFoundException(参见源代码中此文件的末尾)另外,你有一个@ExceptionHandler注释方法来处理同一个异常.
@Override
ResponseEntity handleNoHandlerFoundException(NoHandlerFoundException ex,
HttpHeaders headers, HttpStatus status, WebRequest request)
我认为在您的代码中同时使用它们会导致此问题.
所以要么:
我认为其中任何一个选项都应该有用.
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