java dynamic proxy 動態代理

java動態代理示例

1 顧客 - 直銷商
2 顧客 - 代理商 - 直銷商

1 接口-購買

public interface IBuy {
    /** 購買行爲 */
    public void buy();
}

2 實現-直銷商

public class BuyImpl implements IBuy {

    @Override
    public void buy() {
        System.out.println("直銷購買");
    }
}

3 Proxy-代理商

public class DynamicProxy implements InvocationHandler{
    Object object;

    public DynamicProxy(Object realObj){
        this.object = realObj;
    }

    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        Object result = null;
        System.out.println("代理商購買");
        result = method.invoke(object, args);
        System.out.println("代理商購買成功\n購買完成");
        return result;
    }
}

4 測試

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

        // 真實對象
        IBuy buy = new BuyImpl();

        // 代理對象
        IBuy proxy = (IBuy) Proxy.newProxyInstance(buy.getClass().getClassLoader(), buy.getClass().getInterfaces(), new DynamicProxy(buy));

        // 調用代理
        proxy.buy();
    }
}

//打印日誌：
代理商購買
直銷購買
代理商購買成功
購買完成