把手写的简单工厂变为一个通用工厂

如图工厂类里的方法雷同，可以优化

 

BeanFactory类修改为如下

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package com.baizhiedu.basic;   import java.io.IOException; import java.io.InputStream; import java.util.Properties;   public class BeanFactory {     private static Properties env = new Properties();       static {         try {             //第一步 获取IO输入流             InputStream inputStream = BeanFactory.class.getResourceAsStream("/applicationContext.properties");             //第二步 文件内容 封装 Properties集合中 key = userService , value = com.baizhixx.UserServiceImpl             env.load(inputStream);             //关流             inputStream.close();         } catch (IOException e) {             e.printStackTrace();         }     }       /**      * 对象的创建方式：      *    1.直接调用构造方法 创建对象 UserService userService = new UserServiceImpl();      *    2.通过反射的形式 创建对象 解耦合      *       Class clazz = Class.forName("com.baizhiedu.basic.UserServiceImpl");      *       UserService userService = (UserService)clazz.newInstance();      */ /*    public static UserService getUserService(){         UserService userService = null;         try {             Class clazz = Class.forName(env.getProperty("userService"));             //Object obj = clazz.newInstance();             userService = (UserService)clazz.newInstance();         } catch (ClassNotFoundException e) {             e.printStackTrace();         } catch (InstantiationException e) {             e.printStackTrace();         } catch (IllegalAccessException e) {             e.printStackTrace();         }         return userService;     }       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;     }*/       /**      * 方法参数key 是小配置文件中的key [userDAO, userService]      */     public static Object getBean(String key){         Object ret = null;         try{             Class clazz = Class.forName(env.getProperty(key));             ret = clazz.newInstance();         }catch (Exception e){             e.printStackTrace();         }         return ret;     }       }

　　

 UserServiceImpl修改为如下

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

　　

测试类TestSpring修改为如下

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package com.baizhiedu;   import com.baizhiedu.basic.BeanFactory; import com.baizhiedu.basic.User; import com.baizhiedu.basic.UserService; import com.baizhiedu.basic.UserServiceImpl; import org.junit.Test;   public class TestSpring {     /**      * 用于测试：工厂类进行解耦合的操作      */     @Test     public void test1(){         //UserServiceImplNew           //UserService userService = new UserServiceImplNew(); //        UserService userService = new UserServiceImpl();   //        UserService userService = BeanFactory.getUserService();           UserService userService = (UserService) BeanFactory.getBean("userService");           userService.login("name", "suns");           User user = new User("suns", "123456");         userService.register(user);     } }