public class CustomExceptionResolver implements HandlerExceptionResolver { //前端控制器DispatcherServlet在进行HandlerMapping、调用HandlerAdapter执行Handler过程中,如果遇到异常就会执行此方法 //handler最终要执行的Handler,它的真实身份是HandlerMethod //Exception ex就是接收到异常信息 @Override public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) { //输出异常 ex.printStackTrace(); //统一异常处理代码 //针对系统自定义的CustomException异常,就可以直接从异常类中获取异常信息,将异常处理在错误页面展示 //异常信息 String message = null; CustomException customException = null; //如果ex是系统 自定义的异常,直接取出异常信息 if(ex instanceof CustomException){ customException = (CustomException)ex; }else{ //针对非CustomException异常,对这类重新构造成一个CustomException,异常信息为“未知错误” customException = new CustomException("未知错误"); } //错误 信息 message = customException.getMessage(); request.setAttribute("message", message); try { //转向到错误 页面 request.getRequestDispatcher("/WEB-INF/jsp/error.jsp").forward(request, response); } catch (ServletException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } return new ModelAndView(); } }
时间: 2024-09-30 16:36:50