jdk动态代理

1、定义TimeHandler，并实现InvocationHandler接口

public class TimeHandler implements InvocationHandler {
	private Object target;//定义目标类
	
	
	public TimeHandler(Object target) {
		super();
		this.target = target;
	}

	/*
	 * 
	 */
	@Override
	public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
		long starttime=System.currentTimeMillis();
		System.out.println("汽车开始行驶。。");
		System.out.println("日志开始。。");
		method.invoke(target);
		System.out.println("日志结束。。");
		long endtime=System.currentTimeMillis();
		System.out.println("汽车行驶结束。。"+"行驶时间为："+(endtime-starttime)+"毫秒");

		return null;
	}

}

2、定义要代理的类

        1>定义接口

public interface Moveable {
	void move();
}

        2>类

public class Car implements Moveable {

	@Override
	public void move() {
		
		//实现开车
		try {
			System.out.println("汽车正在行驶。。");
			Thread.sleep(new Random().nextInt(1000));
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
	}

}

3、对目标类car进行jdk动态代理

	//jdk动态代理
	@Test
	public void test06() {
		Car car=new Car();
		Class<?> cls=car.getClass();
		
		InvocationHandler h=new TimeHandler(car);
		Moveable m=(Moveable) Proxy.newProxyInstance(cls.getClassLoader(), cls.getInterfaces(), h);
		m.move();
	}

4、测试结果：