JDK动态代理

先上一小段 Toy Code

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

public class JdkProxy<T> implements InvocationHandler {

	private T target;

	public JdkProxy(T target) {
		this.target = target;
	}

	public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
		System.out.println("log something...");
		Object result = method.invoke(target, args);
		System.out.println("do something...");
		return result;
	}

	public static void main(String[] args) {

		IService proxy = (IService) Proxy.newProxyInstance(IService.class.getClassLoader(),
				new Class<?>[] { IService.class }, new JdkProxy<IService>(new Service()));
		proxy.say("jack");
	}

}

运行结果

log something...
hello jack
do something...

下面就 jdk动态代理是怎么实现的、动态代理的功能目的稍微分析下：

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