使用Spring MVC处理MaxUploadSizeExceededException
问题内容：
超出文件大小时，如何通过文件上传拦截和发送自定义错误消息。我在控制器类中有一个带注释的异常处理程序，但是请求没有到达控制器。我在此链接上遇到的答案如何处理MaxUploadSizeExceededException建议实现HandlerExceptionResolver。
在Spring 3.5中发生了什么变化还是还是唯一的解决方案？
问题答案：
我最终实现了HandlerExceptionResolver：
@Component public class ExceptionResolverImpl implements HandlerExceptionResolver {
private static final Logger LOG = LoggerFactory.getLogger(ExceptionResolverImpl.class);
@Override
public ModelAndView resolveException(HttpServletRequest request,
HttpServletResponse response, Object obj, Exception exc) {
if(exc instanceof MaxUploadSizeExceededException) {
response.setContentType("text/html");
response.setStatus(HttpStatus.REQUEST_ENTITY_TOO_LARGE.value());
try {
PrintWriter out = response.getWriter();
Long maxSizeInBytes = ((MaxUploadSizeExceededException) exc).getMaxUploadSize();
String message = "Maximum upload size of " + maxSizeInBytes + " Bytes per attachment exceeded";
//send json response
JSONObject json = new JSONObject();
json.put(REConstants.JSON_KEY_MESSAGE, message);
json.put(REConstants.JSON_KEY_SUCCESS, false);
String body = json.toString();
out.println("<html><body><textarea>" + body + "</textarea></body></html>");
return new ModelAndView();
}
catch (IOException e) {
LOG.error("Error writing to output stream", e);
}
}
//for default behaviour
return null;
}
}
