动态代理的简单示例

package com.java.project;

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

public class DynamicProxyTest {
	
	interface IHello{
		void sayHello();
	}
	
	static class Hello implements IHello{
		public void sayHello() {
			System.out.println("hello world");
		}
	}
	
	static class DynamicProxy implements InvocationHandler{
		Object originalObj;
		
		Object bind(Object originalObj){
			this.originalObj = originalObj;
			return Proxy.newProxyInstance(originalObj.getClass().getClassLoader(), originalObj.getClass().getInterfaces(), this);
		}

		public Object invoke(Object proxy, Method method, Object[] args)
				throws Throwable {
			System.out.println("welcome");
			return method.invoke(originalObj, args);
		}
	}

	
	public static void main(String[] args) {
		IHello hello = (IHello) new DynamicProxy().bind(new Hello());
		hello.sayHello();
	}

}

输出结果:

welcome
hello world