详解SpringMVC中的异常处理

详解SpringMVC中的异常处理

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

@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;

}

}

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", hZiGqQandlerException);

}

}

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

以上就是详解SpringMVC中的异常处理的详细内容，更多关于SpringMVC 异常处理的资料请关注我们其它相关文章！

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