无法捕获异常（多部分Mime部分文件超过最大文件化）

Question

我的springboot版本是2.0.2，我在controller类中创建了全局异常，如下所示：

@ExceptionHandler(Exception.class)
@ResponseBody
public Result handleException(Exception e, HttpSession session, HttpServletRequest request) {
    LOGGER.error(e.getMessage());

Answer 1

一个解决方案是使用ControllerAdvise。看一下下面的示例：

@ControllerAdvice
public class RestResponseEntityExceptionHandler extends ResponseEntityExceptionHandler {
    @ExceptionHandler(value = {MaxUploadSizeExceededException.class})
    protected ResponseEntity<String> handle(MaxUploadSizeExceededException ex) {
        return ResponseEntity.ok(ex.getMessage());
    }
}

或者，如果您有一个面向视图的控制器，可以让控制器从HandlerExceptionResolver扩展。请看下面的例子：

@Controller
public class MyController implements HandlerExceptionResolver {
    @RequestMapping(value = "/test", method = RequestMethod.POST)
    public ModelAndView someMethod(@RequestParam("file") MultipartFile file) throws Exception{
        return new ModelAndView("success");
    }

    @Override
    public ModelAndView resolveException(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) {
        if (e instanceof MaxUploadSizeExceededException){
            return new ModelAndView("sizeLimitExceeded");
        }
        return new ModelAndView("otherException");
    }
}