DaoException，ServiceException都是自定义异常类，DaoException继承自ServiceException，ServiceException继承自Exception类。显示代码： 1 package com.wei.exception; 2 3 public class DaoException extends ServiceException{ 4 5 public DaoException(){ 6 super("dao层异常"); 7 } 8 9 public DaoException(Str... Read More