23种设计模式之代理模式

代理模式有2种应用场景
1.权限控制。
2.功能增强。

例：一酒厂不直接卖酒，通过代理商来卖酒，代理商进行包装及返点卖给客户。
直接上代码

public class WineProxyTest {
    public static void main(String[] args) {

        WineProxyStore wineProxyStore = new WineProxyStore();
        wineProxyStore.sell();
    }
}


interface WineFactory {
    // 抽象工厂厂家卖酒
    void sell();
}

class WineFactoryImpl implements WineFactory {

    @Override
    public void sell() {
        System.out.println("厂家真正卖酒");
    }
}


class WineProxyStore implements WineFactory {

    private WineFactoryImpl wineFactory;


    @Override
    public void sell() {

        if (wineFactory == null) {
            wineFactory = new WineFactoryImpl();
        }
        preSell();
        wineFactory.sell();
        postSell();
    }

    private void postSell() {
        System.out.println("代理商返点");
    }

    private void preSell() {
        System.out.println("代理商包装");
    }
}

通过代理商代理将酒卖了出去。

参考资料：
1.http://c.biancheng.net/view/1359.html
代码地址：https://gitee.com/zhoujie1/design-mode-and-principle.git