外观模式

10-1 外观模式讲解

11-2 装饰者模式coding

有一个积分礼物类：

/** 积分礼物 */public class PointsGift {    private String name;    public PointsGift(String name) {        this.name = name;    }    public String getName() {        return name;    }}

校验类：是否有资格

public class QualifyService {    public boolean isAvailable(PointsGift pointsGift) {        System.out.println("校验"+pointsGift.getName()+"积分资格通过,库存通过");        return true;    }}

积分支付类：

public class PointsPaymentService {    public boolean pay(PointsGift pointsGift) {        /** 扣减积分 */        System.out.println("支付"+pointsGift.getName()+" 积分成功");        return true;    }}

还要一个物流子系统：

public class ShippingService {    public String shipGift(PointsGift pointsGift) {        /** 物流系统对接逻辑 */        System.out.println(pointsGift.getName() + "进入物流系统");        String shippingOrderNo = "666";        return shippingOrderNo;    }}

积分交换交易：

public class GiftExchangeService {    private QualifyService qualifyService;    private PointsPaymentService pointsPaymentService;    private ShippingService shippingService;    public void setQualifyService(QualifyService qualifyService) {        this.qualifyService = qualifyService;    }    public void setPointsPaymentService(PointsPaymentService pointsPaymentService) {        this.pointsPaymentService = pointsPaymentService;    }    public void setShippingService(ShippingService shippingService) {        this.shippingService = shippingService;    }    public void giftExchange(PointsGift pointsGift) {        if (qualifyService.isAvailable(pointsGift)) {            /** 资格检验通过 */            if (pointsPaymentService.pay(pointsGift)) {                //如果积分支付成功,那么就是可以返回订单号了                String shippingOrderNo = shippingService.shipGift(pointsGift);                System.out.println("物流订单系统下单成功，订单号是："+shippingOrderNo);            }        }    }}

这个就是外观模式的类图：

测试代码：

public class Test {    public static void main(String[]args){        PointsGift pointsGift = new PointsGift("T恤");        GiftExchangeService giftExchangeService = new GiftExchangeService();        giftExchangeService.setQualifyService(new QualifyService());        giftExchangeService.setPointsPaymentService(new PointsPaymentService());        giftExchangeService.setShippingService(new ShippingService());        giftExchangeService.giftExchange(pointsGift);    }}

运行结果：

校验T恤积分资格通过,库存通过
支付T恤积分成功
T恤进入物流系统
物流订单系统下单成功，订单号是：666

这个就是现在的类图：

这里和子系统有关联关系是因为没有集成Spring,我们可以模拟一下，在外观类里面直接new出实例：

public class GiftExchangeService {    private QualifyService qualifyService  = new QualifyService();    private PointsPaymentService pointsPaymentService = new PointsPaymentService();    private ShippingService shippingService = new ShippingService();    public void giftExchange(PointsGift pointsGift) {        if (qualifyService.isAvailable(pointsGift)) {            /** 资格检验通过 */            if (pointsPaymentService.pay(pointsGift)) {                //如果积分支付成功,那么就是可以返回订单号了                String shippingOrderNo = shippingService.shipGift(pointsGift);                System.out.println("物流订单系统下单成功，订单号是："+shippingOrderNo);            }        }    }}

测试类：

public class Test {    public static void main(String[]args){        PointsGift pointsGift = new PointsGift("T恤");        GiftExchangeService giftExchangeService = new GiftExchangeService();        giftExchangeService.giftExchange(pointsGift);    }}

这个时候的类图就这样的：

我们还可以用抽象外观类来实现；

11-3 装饰者模式源码解析(spring-session mybatis jdk servlet)

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