public interface Rent {
    public void rent();
}

//房東
public class Host implements Rent {
    public void rent() {
        System.out.println("房東要租房子");
    }
}

public class Proxy implements Rent{
    private Host host;
    public Proxy() {
    }
    public Proxy(Host host) {
        this.host = host;
    }
    public void rent(){
        seeHouse();
        host.rent();
        fare();
    }
    //看房
    public void seeHouse(){
        System.out.println("中介帶你看房");
    }
    //收中介費(fèi)
    public void fare(){
        System.out.println("中介收費(fèi)");
    }
}

public class Client {
    public static void main(String[] args) {
        Host host = new Host();
        //代理，代理角色一般會(huì)有附屬操作！
        Proxy proxy = new Proxy(host);
        proxy.rent();
    }
}

//Proxy是生成動(dòng)態(tài)代理類，提供了創(chuàng)建動(dòng)態(tài)代理類和實(shí)例的靜態(tài)方法，它也是由這些方法創(chuàng)建的所有動(dòng)態(tài)代理類的超類。
//InvocationHandler-- invoke 調(diào)用處理程序并返回接口， 是由代理實(shí)例的調(diào)用處理程序?qū)崿F(xiàn)的接口 。

public static Object newProxyInstance(ClassLoader loader, Class<?>[] interfaces, InvocationHandler h){
}

public interface InvocationHandler {
    Object invoke(Object proxy, Method method, Object[] args) throws Throwable;
}

public interface Rent {
    public void rent();
}

public class Host implements Rent {
    @Override
    public void rent() {
        System.out.println("房東要租房");
    }
}

public class DebugInvocationHandler implements InvocationHandler {
    /**
     * 代理類中的真實(shí)對(duì)象
     */
    private final Object target;
    public DebugInvocationHandler(Object target){
        this.target = target;
    }
    /**
     * 當(dāng)你使用代理對(duì)象調(diào)用方法的時(shí)候?qū)嶋H會(huì)調(diào)用到這個(gè)方法
     */
    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        //調(diào)用方法前
        System.out.println("before method" + method.getName());
        Object res = method.invoke(target, args);
        //調(diào)用方法后
        System.out.println("after method" + method.getName());
        return res;
    }
}

public class JdkProxyFactory {
    public static Object getProxy(Object target){
        return Proxy.newProxyInstance(
                target.getClass().getClassLoader(),
                target.getClass().getInterfaces(),
                new DebugInvocationHandler(target)
        );
    }
}

public static void main(String[] args) {
        //Rent rent = new Host();
        //Rent rentProxy= (Rent) Proxy.newProxyInstance(rent.getClass().getClassLoader(), rent.getClass().getInterfaces(),new DebugInvocationHandler(rent));
        Rent rentProxy = (Rent)JdkProxyFactory.getProxy(new Host());
        rentProxy.rent();
    }