策略模式支付案例-优快云博客

本文介绍了一个基于策略模式的支付系统实现案例。通过定义一系列的算法，并将每个算法封装起来，使它们可以相互替换，策略模式让算法的变化独立于使用算法的客户。文中详细展示了如何使用接口和枚举类型来实现不同支付方式的灵活切换。

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直接上课上的例子，我们购物后需要支付，支付方式可以有多种：支付宝，微信...

└── strategy
    ├── AliPay.java
    ├── Order.java
    ├── Payment.java
    ├── PayState.java
    ├── PayStrategyTest.java
    ├── PayType.java
    └── WechatPay.java

package com.xh.pattern.strategy;

/**
 * Created by root on 3/15/18.
 */
public class Order {
    private String uid;
    private String orderId;
    private double amount;

    public Order(String uid, String orderId, double amount) {
        this.uid = uid;
        this.orderId = orderId;
        this.amount = amount;
    }


    //这个参数，完全可以用Payment这个接口来代替
    //为什么？

    //完美地解决了switch的过程，不需要在代码逻辑中写switch了
    //更不需要写if    else if
    public PayState pay(PayType payType) {
        return payType.get().pay(this.uid, this.amount);
    }


}

package com.xh.pattern.strategy;

/**
 * Created by root on 3/15/18.
 */
public interface Payment {
    public PayState pay(String uid, double amount);
}

package com.xh.pattern.strategy;

/**
 * Created by root on 3/15/18.
 */
public enum PayType {
    ALI_PAY(new AliPay()),
    WECHAT_PAY(new WechatPay());


    private Payment payment;

    PayType(Payment payment) {
        this.payment = payment;
    }

    public Payment get() {
        return this.payment;
    }

}

package com.xh.pattern.strategy;

/**
 * Created by root on 3/15/18.
 */
public class PayState {
    private int code;
    private Object data;
    private String msg;

    public PayState(int code, String msg, Object data) {
        this.code = code;
        this.data = data;
        this.msg = msg;
    }

    public String toString() {
        return ("支付状态：[" + code + "]," + msg + ",交易详情：" + data);
    }

}

package com.xh.pattern.strategy;

/**
 * Created by root on 3/15/18.
 */
public class AliPay implements Payment {

    @Override
    public PayState pay(String uid, double amount) {
        System.out.println("欢迎使用支付宝");
        System.out.println("查询账户余额，开始扣款");
        return new PayState(200,"支付成功",amount);
    }
}

package com.xh.pattern.strategy;

/**
 * Created by root on 3/15/18.
 */
public class WechatPay implements Payment {
    @Override
    public PayState pay(String uid, double amount) {
        System.out.println("欢迎使用微信支付");
        System.out.println("直接从微信红包扣款");
        return new PayState(200, "支付成功", amount);
    }

}

package com.xh.pattern.strategy;

/**
 * Created by root on 3/15/18.
 */
public class PayStrategyTest {
    public static void main(String[] args) {
        //省略把商品添加到购物车，再从购物车下单
        //直接从点单开始
        Order order = new Order("1", "20180311001000009", 324.45);

        //开始支付，选择微信支付、支付宝、银联卡、京东白条、财付通
        //每个渠道它支付的具体算法是不一样的
        //基本算法固定的

        //这个值是在支付的时候才决定用哪个值
        System.out.println(order.pay(PayType.WECHAT_PAY));


    }
}

转载于:https://www.cnblogs.com/lanqie/p/8574783.html