package com.lky.proxy;

import java.lang.reflect.InvocationHandler;

import java.lang.reflect.Method;

import java.lang.reflect.Proxy;

public class DynamicProxy implements InvocationHandler {

    private Object obj;//被调用的目标对象

    public DynamicProxy(Object obj) {

        this.obj = obj;

    }

    /**

    * @Title: invoke

     @param arg0

     @param arg1  被调用目标对象的方法

     @param arg2  被调用目标对象方法的参数

     @return

     @throws Throwable    参数

    * @return    返回类型

     */

    @Override

    public Object invoke(Object arg0, Method arg1, Object[] arg2) throws Throwable {

        Object result = null;

        doBefore();

        result = arg1.invoke(obj, arg2);

        doAfter();

        return result;

    }

    //工厂模式生成动态动态代理

    public static Object proxyFactory(Object object) {

        Class<? extends Object> cls = object.getClass();

        return Proxy.newProxyInstance(cls.getClassLoader(), cls.getInterfaces(), new DynamicProxy(object));

    }

    public void doBefore() {

        System.out.println("初始化。。。。。。。。。");

    }

    public void doAfter() {

        System.out.println("日志处理。。。。。。。。。");

    }

}

package com.lky.proxy;

import org.junit.Test;

public class testProxy {

    @Test

    public void test(){

        Cat cat=new Cat();

        Animal animal=(Animal)DynamicProxy.proxyFactory(cat);

        animal.eat();

        System.out.println("-------------------");

        animal.sleep();

        System.out.println("-------------------");

        Car car=new Car();

        Vehicle vehicle=(Vehicle)DynamicProxy.proxyFactory(car);

        vehicle.run();

        System.out.println("-------------------");

        vehicle.stop();

    }

}