package com.crow;

import java.lang.reflect.InvocationHandler;

import java.lang.reflect.Method;

import java.lang.reflect.Proxy;

import java.util.ArrayList;

import java.util.Collection;

/**

* Created by CrowHawk on 17/2/20.

*/

public class ProxyTest {

public static void main(String args[]){

ArrayList<String> target = new ArrayList<>();//创建目标类的实例对象

ImpAdvice impAdvice = new ImpAdvice();

Collection proxy = (Collection) getProxy(target, impAdvice);//创建动态类

proxy.add("aa");

System.out.println(proxy.size());

System.out.println(proxy.getClass().getName());

}

public static Object getProxy(final Object target, final Advice advice){

Object proxy = Proxy.newProxyInstance(

target.getClass().getClassLoader(),

target.getClass().getInterfaces(),

new InvocationHandler() {//动态类通过Invocation类的invoke方法调用目标类所需的方法

public Object invoke(Object proxy, Method method, Object[] args) throws Exception {

advice.forwardMethod(method);

Object retVal = method.invoke(target, args);

advice.backMethod(method);

return retVal;

}

}

);

return proxy;

}

}