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。
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@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;
}
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@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
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@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;
}
}
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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
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@ResponseStatus(reason = "用户被拒绝登录", value = HttpStatus.NOT_ACCEPTABLE)
public class UsernameNotFoundException extends RuntimeException {
private static final long serialVersionUID = 1L;
}
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4. DefaultHandlerExceptionResolver默认异常
DefaultHandlerExceptionResolver包含以下默认异常
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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;
}
...
}
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如下HttpRequestMethodNotSupportedException请求方式不对。使用GET对POST方法进行访问
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@RequestMapping(value = "/handle03", method = RequestMethod.POST)
public String postMethod() {
return "success";
}
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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服务器之家其它相关文章！
原文链接：https://segmentfault.com/a/1190000039411231