Java 设计模式之装饰模式

装饰模式有点类似于责任链,但是还是有区别,直接上代码然后运行下自己体会,

这是文件构成总计 5个外加一个运行实体类 Factory

一  AbstractDecorator 类
public class AbstractDecorator extends GatewayComponent {

    private GatewayComponent gatewayComponent;
    public AbstractDecorator(GatewayComponent gatewayComponent) {
        this.gatewayComponent = gatewayComponent;
    }

二 BasicComponentGateway 类

public class BasicComponentGateway extends GatewayComponent {
    @Override
    public void service() {
        System.out.println("第一步>>> 网关中获取基本操作...实现");
    }
}

    @Override
    public void service() {
        if (null != gatewayComponent)
            gatewayComponent.service();
    }
}

三 GatewayComponent 类

public abstract class GatewayComponent {
    public abstract void service();
}

四 LimitDecoratory 类

public class LimitDecoratory  extends AbstractDecorator{
    
    public LimitDecoratory(GatewayComponent gatewayComponent) {
        super(gatewayComponent);
    }

    @Override
    public void service() {
        super.service();
        System.out.println("第三步>> 网关限制APi接口");
    }
}

五 LogDecorator 类

    public class LogDecorator extends AbstractDecorator {
    public LogDecorator(GatewayComponent gatewayComponent) {
        super(gatewayComponent);
    }

    @Override
    public void service() {
          super.service();
        System.out.println("第二步>>>日志的收集");
    }
}

六运行类 Factory

public class Factory {

    public static GatewayComponent getGatewayComponent() {
//        BasicComponentGateway basicComponentGateway = new BasicComponentGateway();
//        LogDecorator logDecorator = new LogDecorator(basicComponentGateway);
//        LimitDecoratory limitDecoratory = new LimitDecoratory(logDecorator);

        return new LimitDecoratory(new LogDecorator(new BasicComponentGateway()));
    }

    public static void main(String[] args) {
        LimitDecoratory a = (LimitDecoratory) Factory.getGatewayComponent();
        a.service();
    }
}

下边是运行结果

来源：CSDN

作者：成长之旅

链接：https://blog.csdn.net/weixin_39831786/article/details/103471832

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装饰模式