java, proxy

http://www.cnblogs.com/zrtqsk/p/3600588.html

package net;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;

interface Saying {
	public void sayHello(String name);

	public void talking(String name);
}

class SayingImpl implements Saying {
	@Override
	public void sayHello(String name) {
		// TODO Auto-generated method stub
		System.out.println(name + "：大家好啊！");
	}

	@Override
	public void talking(String name) {
		// TODO Auto-generated method stub
		System.out.println(name + "：我的意思是，我们要努力建设和谐社会！");
	}
}

class MyInvocationHandler implements InvocationHandler {

	private Object target;

	MyInvocationHandler(Object target) {
		this.target = target;
	}

	@Override
	public Object invoke(Object proxy, Method method, Object[] args)
			throws Throwable {
		// 目标方法前执行
		System.out.println("——————————————————————————");
		System.out.println("下一位请登台发言！");
		// 目标方法调用
		Object obj = method.invoke(target, args);
		// 目标方法后执行
		System.out.println("大家掌声鼓励！");
		return obj;
	}
}

public class JDKProxyTest {

	public static void main(String[] args) {
		// 希望被代理的目标业务类
		Saying target = new SayingImpl();
		// 将目标类和横切类编织在一起
		MyInvocationHandler handler = new MyInvocationHandler(target);
		// 创建代理实例
		Saying proxy = (Saying) Proxy.newProxyInstance(target.getClass()
				.getClassLoader(),// 目标类的类加载器
				target.getClass().getInterfaces(),// 目标类的接口
				handler);// 横切类
		proxy.sayHello("小明");
		proxy.talking("小丽");
	}
}