public class CustomException extends Exception {
  
  //異常信息
  private String message;
  
  public CustomException(String message){
    super(message);
    this.message = message;
    
  }
  public String getMessage() {
    return message;
  }

  public void setMessage(String message) {
    this.message = message;
  }
  
}

public class CustomExceptionResolver implements HandlerExceptionResolver {

  //前端控制器DispatcherServlet在進(jìn)行HandlerMapping、調(diào)用HandlerAdapter執(zhí)行Handler過程中，如果遇到異常就會(huì)執(zhí)行此方法
  //handler最終要執(zhí)行的Handler，它的真實(shí)身份是HandlerMethod
  //Exception ex就是接收到異常信息
  @Override
  public ModelAndView resolveException(HttpServletRequest request,
      HttpServletResponse response, Object handler, Exception ex) {
    //輸出異常
    ex.printStackTrace();
    
    //統(tǒng)一異常處理代碼
    //針對系統(tǒng)自定義的CustomException異常，就可以直接從異常類中獲取異常信息，將異常處理在錯(cuò)誤頁面展示
    //異常信息
    String message = null;
    CustomException customException = null;
    //如果ex是系統(tǒng) 自定義的異常，直接取出異常信息
    if(ex instanceof CustomException){
      customException = (CustomException)ex;
    }else{
      //針對非CustomException異常，對這類重新構(gòu)造成一個(gè)CustomException，異常信息為“未知錯(cuò)誤”
      customException = new CustomException("未知錯(cuò)誤");
    }
    
    //錯(cuò)誤 信息
    message = customException.getMessage();
    
    request.setAttribute("message", message);

    
    try {
      //轉(zhuǎn)向到錯(cuò)誤 頁面
      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();
  }

}

<!-- 定義統(tǒng)一異常處理器 -->
  <bean class="com.hao.ssm.exception.CustomExceptionResolver"></bean>