吴裕雄--天生自然轻量级JAVA EE企业应用开发Struts2Sping4Hibernate整合开发学习笔记：企业应用开发的思考和策略_DynaProxy

/**
 * Description:
 * <br/>网站: <a href="http://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="http://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="http://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="http://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();
    }
}

/**
 * Description:
 * <br/>网站: <a href="http://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 TxUtil
{
    // 第一个拦截器方法:模拟事务开始
    public void beginTx()
    {
        System.out.println("=====模拟开始事务=====");
    }
    // 第二个拦截器方法:模拟事务结束
    public void endTx()
    {
        System.out.println("=====模拟结束事务=====");
    }
}

/**
 * Description:
 * <br/>网站: <a href="http://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
    void info();
    // run()方法声明
    void run();
}