AOP动态代理

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
//关键：设置真实代理对象newProxyInstance，然后去获取代理对象
public class FrankPoxy implements InvocationHandler{
    private   Object target;

    public Object getTarget() {
        return target;
    }

    public void setTarget(Object target) {
        this.target = target;
    }

    //获取代理对象
    public Object getPoxy(){
        return Proxy.newProxyInstance(target.getClass().getClassLoader(),target.getClass().getInterfaces(),this);
    }

    private void doSometingafter() {
        System.out.println("欢迎下次光临！");
    }

    private void doSometingBefore() {
        System.out.println("is ok");
    }
    //真实对象执行的方法
    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        doSometingBefore();
        Object invoke = method.invoke(target, args);
        System.out.println(invoke);
        doSometingafter();
        return null;
    }

public class TestA {
    public static void main(String[] args) {
        ClothFactoryImpl clothFactory = new ClothFactoryImpl();
        //代理商
        FrankPoxy frankPoxy = new FrankPoxy();
        //代理的对象
        frankPoxy.setTarget(clothFactory);
        //获取代理对象
        ClothFactory poxy = (ClothFactory) frankPoxy.getPoxy();
        poxy.buyCloth();

    }
}