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技术社区[云栖]
【设计模式】【动态代理，在方法前和方法后加事务，AOP】
/**
* Description:
* <br/>网站: <a href="https://www.crazyit.org">疯狂Java联盟</a>
* <br/>Copyright (C), 2001-2010, Yeeku.H.Lee
* <br/>This program is protected by copyright laws.
* <br/>Program Name:
* <br/>Date:
* @author Yeeku.H.Lee kongyeeku@163.com
* @version 1.0
*/
public interface Dog
{
//info方法声明
public void info();
//run方法声明
public void run();
}
/**
* Description:
* <br/>网站: <a href="https://www.crazyit.org">疯狂Java联盟</a>
* <br/>Copyright (C), 2001-2010, Yeeku.H.Lee
* <br/>This program is protected by copyright laws.
* <br/>Program Name:
* <br/>Date:
* @author Yeeku.H.Lee kongyeeku@163.com
* @version 1.0
*/
public class GunDog implements Dog
{
//info方法实现，仅仅打印一个字符串
public void info()
{
System.out.println("我是一只猎狗");
}
//run方法实现，仅仅打印一个字符串
public void run()
{
System.out.println("我奔跑迅速");
}
}
import java.lang.reflect.*;
/**
* Description:
* <br/>网站: <a href="https://www.crazyit.org">疯狂Java联盟</a>
* <br/>Copyright (C), 2001-2010, Yeeku.H.Lee
* <br/>This program is protected by copyright laws.
* <br/>Program Name:
* <br/>Date:
* @author Yeeku.H.Lee kongyeeku@163.com
* @version 1.0
*/
public class MyInvokationHandler
implements InvocationHandler
{
//需要被代理的对象
private Object target;
public void setTarget(Object target)
{
this.target = target;
}
//执行动态代理对象的所有方法时，都会被替换成执行如下的invoke方法
public Object invoke(Object proxy, Method method, Object[] args)
throws Exception
{
TxUtil tx = new TxUtil();
//执行TxUtil对象中的beginTx。
tx.beginTx();
//以target作为主调来执行method方法
Object result = method.invoke(target , args);
//执行TxUtil对象中的endTx。
tx.endTx();
return result;
}
}
import java.lang.reflect.*;
/**
* Description:
* <br/>网站: <a href="https://www.crazyit.org">疯狂Java联盟</a>
* <br/>Copyright (C), 2001-2010, Yeeku.H.Lee
* <br/>This program is protected by copyright laws.
* <br/>Program Name:
* <br/>Date:
* @author Yeeku.H.Lee kongyeeku@163.com
* @version 1.0
*/
public class MyInvokationHandler
implements InvocationHandler
{
//需要被代理的对象
private Object target;
public void setTarget(Object target)
{
this.target = target;
}
//执行动态代理对象的所有方法时，都会被替换成执行如下的invoke方法
public Object invoke(Object proxy, Method method, Object[] args)
throws Exception
{
TxUtil tx = new TxUtil();
//执行TxUtil对象中的beginTx。
tx.beginTx();
//以target作为主调来执行method方法
Object result = method.invoke(target , args);
//执行TxUtil对象中的endTx。
tx.endTx();
return result;
}
}
import java.lang.reflect.*;
/**
* Description:
* <br/>网站: <a href="https://www.crazyit.org">疯狂Java联盟</a>
* <br/>Copyright (C), 2001-2010, Yeeku.H.Lee
* <br/>This program is protected by copyright laws.
* <br/>Program Name:
* <br/>Date:
* @author Yeeku.H.Lee kongyeeku@163.com
* @version 1.0
*/
public class MyProxyFactory
{
//为指定target生成动态代理对象
public static Object getProxy(Object target)
throws Exception
{
//创建一个MyInvokationHandler对象
MyInvokationHandler handler =
new MyInvokationHandler();
//为MyInvokationHandler设置target对象
handler.setTarget(target);
//创建、并返回一个动态代理
return Proxy.newProxyInstance(target.getClass().getClassLoader()
, target.getClass().getInterfaces(), handler);
}
}
/**
* Description:
* <br/>网站: <a href="https://www.crazyit.org">疯狂Java联盟</a>
* <br/>Copyright (C), 2001-2010, Yeeku.H.Lee
* <br/>This program is protected by copyright laws.
* <br/>Program Name:
* <br/>Date:
* @author Yeeku.H.Lee kongyeeku@163.com
* @version 1.0
*/
public class Test
{
public static void main(String[] args)
throws Exception
{
//创建一个原始的GunDog对象，作为target
Dog target = new GunDog();
//以指定的target来创建动态代理
Dog dog = (Dog)MyProxyFactory.getProxy(target);
//调用代理对象的info()和run()方法
dog.info();
dog.run();
}
}
最后更新：2017-04-04 07:03:38