详解SpringMVC中的异常处理

@ExceptionHandler(value = { ArithmeticException.class, NullPointerException.class }) 
// 告诉SpringMVC,这个方法专门处理这个类发送的所有异常
public ModelAndView handleException01(Exception exception) {
  System.out.println("handleException01..." + exception);
  ModelAndView view = new ModelAndView("myerror");
  view.addObject("ex", exception);  
  return view;
}

@ControllerAdvice
public class MyException {
  // 处理空指针异常
  @ExceptionHandler(value = { NullPointerException.class })
  public ModelAndView handleException01(Exception exception) {
    System.out.println("全局的handleException01..." + exception);
    ModelAndView view = new ModelAndView("myerror");
    view.addObject("ex", exception);
    return view;
  }

  // 处理算数异常
  @ExceptionHandler(value = { ArithmeticException.class })
  public ModelAndView handleException02(Exception exception) {
    System.out.println("全局的handleException02..." + exception);
    ModelAndView view = new ModelAndView("myerror");
    view.addObject("ex", exception);
    return view;
  }
}

@ResponseStatus(reason = "用户被拒绝登录", value = HttpStatus.NOT_ACCEPTABLE)
public class UsernameNotFoundException extends RuntimeException {
  private static final long serialVersionUID = 1L;
}

源码:
public class DefaultHandlerExceptionResolver extends AbstractHandlerExceptionResolver {
  ...
  @Override
  protected ModelAndView doResolveException(HttpServletRequest request, HttpServletResponse response,
      Object handler, Exception ex) {

    try {
      if (ex instanceof NoSuchRequestHandlingMethodException) {
        return handleNoSuchRequestHandlingMethod((NoSuchRequestHandlingMethodException) ex, request, response,
            handler);
      }
      else if (ex instanceof HttpRequestMethodNotSupportedException) {
        return handleHttpRequestMethodNotSupported((HttpRequestMethodNotSupportedException) ex, request,
            response, handler);
      }
      else if (ex instanceof HttpMediaTypeNotSupportedException) {
        return handleHttpMediaTypeNotSupported((HttpMediaTypeNotSupportedException) ex, request, response,
            handler);
      }
      else if (ex instanceof HttpMediaTypeNotAcceptableException) {
        return handleHttpMediaTypeNotAcceptable((HttpMediaTypeNotAcceptableException) ex, request, response,
            handler);
      }
      else if (ex instanceof MissingPathVariableException) {
        return handleMissingPathVariable((MissingPathVariableException) ex, request,
            response, handler);
      }
      else if (ex instanceof MissingServletRequestParameterException) {
        return handleMissingServletRequestParameter((MissingServletRequestParameterException) ex, request,
            response, handler);
      }
      else if (ex instanceof ServletRequestBindingException) {
        return handleServletRequestBindingException((ServletRequestBindingException) ex, request, response,
            handler);
      }
      else if (ex instanceof ConversionNotSupportedException) {
        return handleConversionNotSupported((ConversionNotSupportedException) ex, request, response, handler);
      }
      else if (ex instanceof TypeMismatchException) {
        return handleTypeMismatch((TypeMismatchException) ex, request, response, handler);
      }
      else if (ex instanceof HttpMessageNotReadableException) {
        return handleHttpMessageNotReadable((HttpMessageNotReadableException) ex, request, response, handler);
      }
      else if (ex instanceof HttpMessageNotWritableException) {
        return handleHttpMessageNotWritable((HttpMessageNotWritableException) ex, request, response, handler);
      }
      else if (ex instanceof MethodArgumentNotValidException) {
        return handleMethodArgumentNotValidException((MethodArgumentNotValidException) ex, request, response,
            handler);
      }
      else if (ex instanceof MissingServletRequestPartException) {
        return handleMissingServletRequestPartException((MissingServletRequestPartException) ex, request,
            response, handler);
      }
      else if (ex instanceof BindException) {
        return handleBindException((BindException) ex, request, response, handler);
      }
      else if (ex instanceof NoHandlerFoundException) {
        return handleNoHandlerFoundException((NoHandlerFoundException) ex, request, response, handler);
      }
    }
    catch (Exception handlerException) {
      if (logger.isWarnEnabled()) {
        logger.warn("Handling of [" + ex.getClass().getName() + "] resulted in Exception", handlerException);
      }
    }
    return null;
  }
  ...
}

@RequestMapping(value = "/handle03", method = RequestMethod.POST)
public String postMethod() {
  return "success";
}