3.20 spring学习笔记一

 通过自己写例子理解工厂模式

测试工厂类,了解AOP,IOC机制.
通过UserDao的接口来调用不同的方法来存储实例.
首先有UserDao接口.有各种实现类.
其次有一个管理类UserMangaer,来实现接口中各种方法的使用.
再次有一个Test类来测试,通过自己创建UserMangaer来调用UserDao接口中的方法
用到了多态,单例模式,跟工厂模式.
Spring就是把各种接口的实现放入到配置里,然后根据情况来调用.

 

 

 

 

 

 package zhc.love.dj.Dao;public interface UserDao {public void save(String name ,String password);} 

 

package zhc.love.dj.Dao;public class UserDaoFactory { private static UserDaoFactory instance = new UserDaoFactory();private UserDaoFactory(){}public static UserDaoFactory getInstance(){return instance ;}public UserDao CreatUserDao(){return new UserDaoMysqlImp();}}

 

package zhc.love.dj.Dao;public class UserDaoMSSqlImp implements UserDao {public void save(String name, String password) {System.out.println("----------MSSql.save()------------");}}

 

package zhc.love.dj.Dao;public class UserDaoMysqlImp implements UserDao {public void save(String name, String password) {System.out.println("----------MySql.save()------------");}}

 

package zhc.love.dj.Maneger;import zhc.love.dj.Dao.UserDao;import zhc.love.dj.Dao.UserDaoFactory;//通过这个类来调用Userdao接口.这个类为工厂类public class UserMangaer {UserDao userdao ;//单例模式的三点要素 ,线程不安全的.//1:私有的静态的实例.private static UserMangaer instance = new UserMangaer();//2.私有构造方法private UserMangaer(){userdao = UserDaoFactory.getInstance().CreatUserDao() ; }//共有的静态方法.public static UserMangaer getInstance(){return instance ;}public void save(String name, String password) {userdao.save(name, password);}}

 

package zhc.love.dj.test;import zhc.love.dj.Maneger.UserMangaer;public class Test {public static void main(String[] args){UserMangaer.getInstance().save("zhangchao", "loveduanjing");}}