java设计形式(3)-工厂模式及其实例

2012-10-29

java设计模式(3)--工厂模式及其实例一.工厂模式，以数据库的业务逻辑为简单例子，里面有很多不合理的地方，目

java设计模式(3)--工厂模式及其实例

一.工厂模式，以数据库的业务逻辑为简单例子，里面有很多不合理的地方，目的是为了阐述对工厂模式的理解。

1.声明接口BaseDAO

/**
?**工厂接口
?**作者：???
?**Blong:http://www.blogjava.net/1504
?**E-mail:yyk1504@163.com
?**QQ:251218333
?**2008-12-16 下午02:08:15
*/
package cn.com.model.factory;

import java.sql.Connection;

public interface BaseDAO
{
??? /**数据库的插入方法*/
??? public void save();?
??? /**数据库的更新方法*/
??? public void update();
??? /**数据库的删除方法*/
??? public void delete();
}

2.MYSQL具体实现MysqlDAO

*Mysql数据库实现业务逻辑类
?*作者：???
?*Blong:http://www.blogjava.net/1504
?*E-mail:yyk1504@163.com
?*QQ:251218333
?*2008 2008-12-16 
*/
package cn.com.model.factory;

import java.sql.Connection;
import java.sql.DriverManager;

public class MysqlDAO implements BaseDAO
{

??? public void delete()
??? {
??????? /**
???????? *此方法的功能介绍
???????? *delete
???????? *MysqlDao
???????? *
???????? *Author:ASUS_1
???????? 2008 2008-12-16 下午02:16:27
??????? */
??????? System.out.println("Mysql在此处实现删除....");
??? }

??? public void save()
??? {
??????? /**
???????? *此方法的功能介绍
???????? *save
???????? *MysqlDao
???????? *
???????? *Author:ASUS_1
???????? 2008 2008-12-16 下午02:16:27
??????? */
??????? System.out.println("Mysql在此处实现保存....");
??? }

??? public void update()
??? {
??????? /**
???????? *此方法的功能介绍
???????? *update
???????? *MysqlDao
???????? *
???????? *Author:ASUS_1
???????? 2008 2008-12-16 下午02:16:27
??????? */
??????? System.out.println("Mysql在此处实现更新....");
??? }

???
}

3.SQL2000具体实现类

/**
?*MsSql2000数据库实现业务逻辑类
?*作者：???
?*Blong:http://www.blogjava.net/1504
?*E-mail:yyk1504@163.com
?*QQ:251218333
?*2008 2008-12-16 
*/
package cn.com.model.factory;

import java.sql.Connection;
import java.sql.DriverManager;

public class MsSql2000DAO implements BaseDAO
{

??? public void delete()
??? {
??????? /**
???????? *此方法的功能介绍
???????? *delete
???????? *MsSql2000DAO
???????? *
???????? *Author:ASUS_1
???????? 2008 2008-12-16 下午02:21:04
??????? */
??????? System.out.println("MsSql2000在此处实现删除....");
??? }

??? public void save()
??? {
??????? /**
???????? *此方法的功能介绍
???????? *save
???????? *MsSql2000DAO
???????? *
???????? *Author:ASUS_1
???????? 2008 2008-12-16 下午02:21:04
??????? */
??????? System.out.println("MsSql2000在此处实现保存....");
??? }

??? public void update()
??? {
??????? /**
???????? *此方法的功能介绍
???????? *update
???????? *MsSql2000DAO
???????? *
???????? *Author:ASUS_1
???????? 2008 2008-12-16 下午02:21:04
??????? */
??????? System.out.println("MsSql2000在此处实现更新....");
??? }

??? }

4.SQL2005具体实现类

/**
?*MsSql2005数据库实现业务逻辑类
?*作者：???
?*Blong:http://www.blogjava.net/1504
?*E-mail:yyk1504@163.com
?*QQ:251218333
?*2008 2008-12-16 
*/
package cn.com.model.factory;

import java.sql.Connection;
import java.sql.DriverManager;

public class MsSql2005DAO implements BaseDAO
{

??? public void delete()
??? {
??????? /**
???????? *此方法的功能介绍
???????? *delete
???????? *MsSql2005DAO
???????? *
???????? *Author:ASUS_1
???????? 2008 2008-12-16 下午02:23:38
??????? */
??????? System.out.println("MsSql2005在此处实现删除....");
??? }

??? public void save() {
??????? /**
???????? *此方法的功能介绍
???????? *save
???????? *MsSql2005DAO
???????? *
???????? *Author:ASUS_1
???????? 2008 2008-12-16 下午02:23:38
??????? */
??????? System.out.println("MsSql2005在此处实现保存....");
??? }

??? public void update()
??? {
??????? /**
???????? *此方法的功能介绍
???????? *update
???????? *MsSql2005DAO
???????? *
???????? *Author:ASUS_1
???????? 2008 2008-12-16 下午02:23:38
??????? */
??????? System.out.println("MsSql2005在此处实现更新....");
??? }

???
}

5.ORACLE具体实现类

/**
?**Oracle数据库实现业务逻辑类
?**作者：???
?**Blong:http://www.blogjava.net/1504
?**E-mail:yyk1504@163.com
?**QQ:251218333
?**2008-12-16 下午02:11:59
*/
package cn.com.model.factory;

import java.sql.Connection;
import java.sql.DriverManager;

public class OracleDAO implements BaseDAO
{

??? public void delete()
??? {
??????? /**
???????? *此方法的功能介绍
???????? *delete
???????? *OracleDao
???????? *
???????? *Author:ASUS_1
???????? *2008 2008-12-16 下午02:12:59
??????? */
??????? System.out.println("Oracle在此处实现删除....");
??? }

??? public void save()
??? {
??????? /**
???????? *此方法的功能介绍
???????? *save
???????? *OracleDao
???????? *
???????? *Author:ASUS_1
???????? *2008 2008-12-16 下午02:12:59
??????? */
??????? System.out.println("Oracle在此处实现保存....");
??? }

??? public void update()
??? {
??????? /**
???????? *此方法的功能介绍
???????? *update
???????? *OracleDao
???????? *
???????? *Author:ASUS_1
???????? *2008 2008-12-16 下午02:12:59
??????? */
??????? System.out.println("Oracle在此处实现更新....");
??? }

?
}

6.工厂类

/**
?*数据库业务工厂
?*作者：???
?*Blong:http://www.blogjava.net/1504
?*E-mail:yyk1504@163.com
?*QQ:251218333
?*2008-12-16 
*/
package cn.com.model.factory;
import cn.com.model.factory.*;
public class DaoFactory

{
???? public BaseDAO createFactory(String type)
???? {??
???????????????? if ("Mysql".equals(type))
???????????????? {??
???????????????????? return new MysqlDAO();??
???????????????? }
???????????????? else
???????????????? if ("MsSql2000".equals(type))
???????????????? {??
???????????????????? return new MsSql2000DAO();??
???????????????? }
???????????????? else?
???????????????? if ("MsSql2005".equals(type))
???????????????? {??
???????????????????? return new MsSql2005DAO();??
???????????????? }
???????????????? else?
???????????????? if ("Oracle".equals(type))
???????????????? {??
???????????????????? return new OracleDAO();??
???????????????? }
???????????????????? return null;??
???????????? }??
??????????
???????????? public static void main(String[] args)
???????????? {??
???????????????? DaoFactory creator = new DaoFactory();??
???????????????? BaseDAO mysqlDAO=creator.createFactory("Mysql");?
???????????????? mysqlDAO.save();
???????????????? mysqlDAO.update();
???????????????? mysqlDAO.delete();
???????????????
???????????????? System.out.println("---------------------------------");
???????????????
???????????????? BaseDAO msSql2000DAO=creator.createProduct("MsSql2000");?
???????????????? msSql2000DAO.save();
???????????????? msSql2000DAO.update();
???????????????? msSql2000DAO.delete();
???????????????
???????????????? System.out.println("---------------------------------");
???????????????
???????????????? BaseDAO msSql2005DAO=creator.createProduct("MsSql2005");?
???????????????? msSql2005DAO.save();
???????????????? msSql2005DAO.update();
???????????????? msSql2005DAO.delete();
???????????????
???????????????? System.out.println("---------------------------------");
???????????????
???????????????? BaseDAO oracleDAO=creator.createProduct("Oracle");?
???????????????? oracleDAO.save();
???????????????? oracleDAO.update();
???????????????? oracleDAO.delete();

???????????? }???
}

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java设计形式(3)-工厂模式及其实例