springmvc全局异常处理器的配置

public class CustomExceptionResolver implements HandlerExceptionResolver{

public ModelAndView resolveException(HttpServletRequest request,
HttpServletResponse response, Object obj,
Exception e) {
// obj：包名+类名+方法名（形参） 字符串， 将这些字符串信息记录在日志文件中，方便以后查看，可以使用log4j记录日志文件
ModelAndView mav = new ModelAndView();
//判断异常为类型
if(e instanceof MessageException){
//预期异常
MessageException me = (MessageException)e;
mav.addObject("error", me.getMsg());
}else{
mav.addObject("error", "未知异常");
}
mav.setViewName("error");
return mav;
}
}

<!-- Springmvc的异常处理器 -->
<bean class="com.itheima.springmvc.exception.CustomExceptionResolver"/>