package cn.dzr.jdbc.dao;



import java.io.File;

import java.io.FileInputStream;

import java.io.InputStream;

import java.util.Properties;





public class DaoFactory {

   private static UserDao dao = null;

   private static DaoFactory instance = new DaoFactory();

   

   

   private DaoFactory()

   {

       

       try

       {

           System.out.println("进入try方法");

            Properties prop = new Properties();

            File file = new File("src/daoconfig.properties");

            InputStream in = new FileInputStream(file);

            in = DaoFactory.class.getClassLoader().getResourceAsStream("daoconfig.properties");

            prop.load(in);

            String userDaoName = prop.getProperty("UserDaoClass");

            System.out.println(userDaoName);

            Class clazz = Class.forName(userDaoName);

            System.out.println("类加载完成！！");

            dao = (UserDao)clazz.newInstance();

            System.out.println("创建类成功！"+dao.getClass().getName());

       }

       catch(Exception e)

       {

           throw new ExceptionInInitializerError(e);

           //初始化错误！

       }

   }

   

   public static DaoFactory getInstance()

   {

       return instance;

   }

   

   public UserDao getUserDao()