1. SpringMVC默认三个异常处理类

• ExceptionHandlerExceptionResolver：处理@ExceptionHandler注解
• ResponseStatusExceptionResolver：处理@ResponseStatus注解
• DefaultHandlerExceptionResolver：处理SpringMVC自带的异常
  

如果以上3个异常解析器都无法处理，会上抛给tomcat，处理异常内部的默认工作流程：所有异常解析器依次尝试解析，解析完成进行后续操作，解析失败，下一个解析器继续尝试解析。

2. @ExceptionHandler注解异常

@ExceptionHandler标注在方法上

• 方法上写一个Exception用来接收发生的异常。
• 要携带异常信息不能给参数位置写Model，正确的做法是返回ModelAndView。
• 如果有多个@ExceptionHandler都能处理这个异常，精确优先。

@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;}

@ExceptionHandler统一异常处理

• 将@ExceptionHandler放在一个单独的类中，进行全局异常处理
• 统一异常管理类需要通过@ControllerAdvice注解加入IoC容器中
• 全局异常处理与本类异常处理同时存在，本类优先

@ControllerAdvicepublic 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; }}

3. @ResponseStatus注解异常

@ResponseStatus注解标注在自定义异常上，用于设置自定义异常信息

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

4. DefaultHandlerExceptionResolver默认异常

DefaultHandlerExceptionResolver包含以下默认异常

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; } ...}

如下HttpRequestMethodNotSupportedException请求方式不对。使用GET对POST方法进行访问

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

5. 没有找到对应异常处理类

若没有对应异常处理类，会进入对应服务器错误页面

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