2021-10-10

package com.zysstart.reflect4;

import sun.security.jca.GetInstance;

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

public class MyDynamic {
    public static void main(String[] args) {
        Bird boy = new Bird("赵玉顺");
        Flyable fly = (Flyable) ProxyInstance.getProxyInstance(boy);
        fly.fly();
    }
}

interface Flyable {
    String fly();
}

class Bird implements Flyable{
    private String name;

    public Bird(String name) {
        this.name = name;
    }

    @Override
    public String fly() {
        System.out.println(name + "在天上高昂的飞翔！");
        return name;
    }
}

class ProxyInstance {
    public static Object getProxyInstance(Object obj) {
        InvocationHandler h = new ProxyHander(obj);
        return Proxy.newProxyInstance(obj.getClass().getClassLoader(),obj.getClass().getInterfaces(),h);
    }
}

class ProxyHander implements InvocationHandler{
    private Object obj;//被代理对象
    public ProxyHander(Object obj) {
        this.obj = obj;
    }

    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        System.out.println("代理开始");
        Object value = method.invoke(obj,args);
        System.out.println("代理结束");
        return  value;

    }
}