手写一个简单的工厂模式（二）

图中这里仍然是耦合的

 

所以首先在BeanFactory类中新增方法getUserDAO()

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public static UserDAO getUserDAO(){     UserDAO userDAO = null;     try {         Class clazz = Class.forName(env.getProperty("userDAO"));         //Object obj = clazz.newInstance();         userDAO = (userDAO)clazz.newInstance();     } catch (ClassNotFoundException e) {         e.printStackTrace();     } catch (InstantiationException e) {         e.printStackTrace();     } catch (IllegalAccessException e) {         e.printStackTrace();     }     return userDAO; }

然后修改 UserServiceImpl 类获取userDAO对象的方式，改为 private UserDAO userDAO = BeanFactory.getUserDAO();

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package com.baizhiedu.basic;   public class UserServiceImpl implements UserService {     //private UserDAO userDAO = new UserDAOImpl();       private UserDAO userDAO = BeanFactory.getUserDAO();       @Override     public void register(User user) {         userDAO.save(user);     }       @Override     public void login(String name, String password) {         userDAO.queryUserByNameAndPassword(name, password);     } }

　　

 修改applicationContext.properties文件，新增 userDao = com.baizhiedu.basic.UserDAOImpl

userService = com.baizhiedu.basic.UserServiceImpl
userDAO = com.baizhiedu.basic.UserDAOImpl