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RocketMQ系列分为三篇进行介绍，上一篇为初识RocketMQ，本篇为第二篇，案例实操篇，通过需求案例上车！

1. 案例介绍

1.1 业务分析

模拟电商网站购物场景中的【下单】和【支付】业务

1）下单

下单组件图.png

用户请求订单系统下单
订单系统通过RPC调用订单服务下单
订单服务调用优惠券服务，扣减优惠券
订单服务调用调用库存服务，校验并扣减库存
订单服务调用用户服务，扣减用户余额
订单服务完成确认订单

2）支付

支付组件图.png

用户请求支付系统
支付系统调用第三方支付平台API进行发起支付流程
用户通过第三方支付平台支付成功后，第三方支付平台回调通知支付系统
支付系统调用订单服务修改订单状态
支付系统调用积分服务添加积分
支付系统调用日志服务记录日志

1.2 问题分析

问题1

用户提交订单后，扣减库存成功、扣减优惠券成功、使用余额成功，但是在确认订单操作失败，需要对库存、库存、余额进行回退。

如何保证数据的完整性？

下单失败流程图.png

使用MQ保证在下单失败后系统数据的完整性 下单时序图(2).png

问题2

用户通过第三方支付平台（支付宝、微信）支付成功后，第三方支付平台要通过回调API异步通知商家支付系统用户支付结果，支付系统根据支付结果修改订单状态、记录支付日志和给用户增加积分。

商家支付系统如何保证在收到第三方支付平台的异步通知时，如何快速给第三方支付凭条做出回应？

支付流程.png

通过MQ进行数据分发，提高系统处理性能

支付成功数据分发流程图.png

2. 技术分析

2.1 技术选型

SpringBoot
Dubbo
Zookeeper
RocketMQ
Mysql

项目结构图.png

2.2 SpringBoot整合RocketMQ

下载rocketmq-spring项目

将rocketmq-spring安装到本地仓库

mvn install -Dmaven.skip.test=true

2.2.1 消息生产者

1）添加依赖

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.1.RELEASE</version>
</parent>

<properties>
    <rocketmq-spring-boot-starter-version>2.0.3</rocketmq-spring-boot-starter-version>
</properties>

<dependencies>
    <dependency>
        <groupId>org.apache.rocketmq</groupId>
        <artifactId>rocketmq-spring-boot-starter</artifactId>
        <version>${rocketmq-spring-boot-starter-version}</version>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>1.18.6</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>

2）配置文件

# application.properties s201(192.168.85.201) s202(192.168.85.202)
rocketmq.name-server=s201:9876;s202:9876
rocketmq.producer.group=my-group

3）启动类

@SpringBootApplication
public class MQProducerApplication {
    public static void main(String[] args) {
        SpringApplication.run(MQSpringBootApplication.class);
    }
}

4）测试类

@RunWith(SpringRunner.class)
@SpringBootTest(classes = {MQSpringBootApplication.class})
public class ProducerTest {

    @Autowired
    private RocketMQTemplate rocketMQTemplate;

        @Test 
    public void test1(){
        rocketMQTemplate.convertAndSend("springboot-mq","hello springboot rocketmq");
    }
}

2.2.2 消息消费者

1）添加依赖

同消息生产者

2）配置文件

同消息生产者

3）启动类

@SpringBootApplication
public class MQConsumerApplication {
    public static void main(String[] args) {
        SpringApplication.run(MQSpringBootApplication.class);
    }
}

4）消息监听器

@Slf4j
@Component
@RocketMQMessageListener(topic = "springboot-mq",consumerGroup = "springboot-mq-consumer-1")
public class Consumer implements RocketMQListener<String> {

    @Override
    public void onMessage(String message) {
        log.info("Receive message："+message);
    }
}

2.3 SpringBoot整合Dubbo

下载dubbo-spring-boot-starter依赖包

将dubbo-spring-boot-starter安装到本地仓库

mvn install -Dmaven.skip.test=true

2.3.1 搭建Zookeeper集群

1）准备工作

安装JDK
将Zookeeper上传到服务器
解压Zookeeper，并创建data目录，将conf下的zoo_sample.cfg文件改名为zoo.cfg
建立/usr/local/zookeeper-cluster,将解压后的Zookeeper复制到以下三个目录 备注：为了简单方便操作，这里zk配置成了伪集群方式，仅此而已。

/usr/local/zookeeper-cluster/zookeeper-1
/usr/local/zookeeper-cluster/zookeeper-2
/usr/local/zookeeper-cluster/zookeeper-3

配置每一个 Zookeeper 的 dataDir（zoo.cfg） clientPort 分别为 2181 2182 2183 修改/usr/local/zookeeper-cluster/zookeeper-1/conf/zoo.cfg

clientPort=2181
dataDir=/usr/local/zookeeper-cluster/zookeeper-1/data

修改/usr/local/zookeeper-cluster/zookeeper-2/conf/zoo.cfg

clientPort=2182
dataDir=/usr/local/zookeeper-cluster/zookeeper-2/data

修改/usr/local/zookeeper-cluster/zookeeper-3/conf/zoo.cfg

clientPort=2183
dataDir=/usr/local/zookeeper-cluster/zookeeper-3/data

2）配置集群

在每个 zookeeper 的 data 目录下创建一个 myid 文件，内容分别是 1、2、3 。这个文件就是记录每个服务器的 ID
在每一个 zookeeper 的 zoo.cfg 配置客户端访问端口（clientPort）和集群服务器 IP 列表。集群服务器 IP 列表如下:

server.1=s201:2881:3881
server.2=s201:2882:3882
server.3=s201:2883:3883

解释：server.服务器 ID=服务器 IP 地址：服务器之间通信端口：服务器之间投票选举端口

3）启动集群

启动集群就是分别启动每个实例。

2.3.2 RPC服务接口

public interface IUserService {
    public String sayHello(String name);
}

2.3.3 服务提供者

1）添加依赖

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.1.RELEASE</version>
</parent>

<dependencies>
    <!--dubbo-->
    <dependency>
        <groupId>com.alibaba.spring.boot</groupId>
        <artifactId>dubbo-spring-boot-starter</artifactId>
        <version>2.0.0</version>
    </dependency>
    <!--spring-boot-stater-->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter</artifactId>
        <exclusions>
            <exclusion>
                <artifactId>log4j-to-slf4j</artifactId>
                <groupId>org.apache.logging.log4j</groupId>
            </exclusion>
        </exclusions>
    </dependency>
    <!--zookeeper-->
    <dependency>
        <groupId>org.apache.zookeeper</groupId>
        <artifactId>zookeeper</artifactId>
        <version>3.4.10</version>
        <exclusions>
            <exclusion>
                <groupId>org.slf4j</groupId>
                <artifactId>slf4j-log4j12</artifactId>
            </exclusion>
            <exclusion>
                <groupId>log4j</groupId>
                <artifactId>log4j</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>com.101tec</groupId>
        <artifactId>zkclient</artifactId>
        <version>0.9</version>
        <exclusions>
            <exclusion>
                <artifactId>slf4j-log4j12</artifactId>
                <groupId>org.slf4j</groupId>
            </exclusion>
        </exclusions>
    </dependency>
    <!--API-->
    <dependency>
        <groupId>com.moe.demo</groupId>
        <artifactId>dubbo-api</artifactId>
        <version>1.0-SNAPSHOT</version>
    </dependency>
</dependencies>

2）配置文件

# application.properties
spring.application.name=dubbo-demo-provider
spring.dubbo.application.id=dubbo-demo-provider
spring.dubbo.application.name=dubbo-demo-provider
spring.dubbo.registry.address=zookeeper://s201:2181;zookeeper://s201:2182;zookeeper://s201:2183
spring.dubbo.server=true
spring.dubbo.protocol.name=dubbo
spring.dubbo.protocol.port=20880

3）启动类

@EnableDubboConfiguration
@SpringBootApplication
public class ProviderBootstrap {
    public static void main(String[] args) throws IOException {
        SpringApplication.run(ProviderBootstrap.class,args);
    }
}

4）服务实现

@Component
@Service(interfaceClass = IUserService.class)
public class UserServiceImpl implements IUserService{
    @Override
    public String sayHello(String name) {
        return "hello:" + name;
    }
}

2.3.4 服务消费者

1）添加依赖

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.1.RELEASE</version>
</parent>

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <!--dubbo-->
    <dependency>
        <groupId>com.alibaba.spring.boot</groupId>
        <artifactId>dubbo-spring-boot-starter</artifactId>
        <version>2.0.0</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter</artifactId>
        <exclusions>
            <exclusion>
                <artifactId>log4j-to-slf4j</artifactId>
                <groupId>org.apache.logging.log4j</groupId>
            </exclusion>
        </exclusions>
    </dependency>
    <!--zookeeper-->
    <dependency>
        <groupId>org.apache.zookeeper</groupId>
        <artifactId>zookeeper</artifactId>
        <version>3.4.10</version>
        <exclusions>
            <exclusion>
                <groupId>org.slf4j</groupId>
                <artifactId>slf4j-log4j12</artifactId>
            </exclusion>
            <exclusion>
                <groupId>log4j</groupId>
                <artifactId>log4j</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>com.101tec</groupId>
        <artifactId>zkclient</artifactId>
        <version>0.9</version>
        <exclusions>
            <exclusion>
                <artifactId>slf4j-log4j12</artifactId>
                <groupId>org.slf4j</groupId>
            </exclusion>
        </exclusions>
    </dependency>
    <!--API-->
    <dependency>
        <groupId>com.moe.demo</groupId>
        <artifactId>dubbo-api</artifactId>
        <version>1.0-SNAPSHOT</version>
    </dependency>
</dependencies>

2）配置文件

# application.properties
spring.application.name=dubbo-demo-consumer
spring.dubbo.application.name=dubbo-demo-consumer
spring.dubbo.application.id=dubbo-demo-consumer
spring.dubbo.registry.address=zookeeper://s201:2181;zookeeper://s201:2182;zookeeper://s201:2183

3）启动类

@EnableDubboConfiguration
@SpringBootApplication
public class ConsumerBootstrap {
    public static void main(String[] args) {
        SpringApplication.run(ConsumerBootstrap.class);
    }
}

4）Controller

@RestController
@RequestMapping("/user")
public class UserController {

    @Reference
    private IUserService userService;

    @RequestMapping("/sayHello")
    public String sayHello(String name){
        return userService.sayHello(name);
    }

}

3. 环境搭建

3.1 数据库

1）优惠券表

Field	Type	Comment
coupon_id	bigint(50) NOT NULL	优惠券ID
coupon_price	decimal(10,2) NULL	优惠券金额
user_id	bigint(50) NULL	用户ID
order_id	bigint(32) NULL	订单ID
is_used	int(1) NULL	是否使用 0未使用 1已使用
used_time	timestamp NULL	使用时间

2）商品表

Field	Type	Comment
goods_id	bigint(50) NOT NULL	主键
goods_name	varchar(255) NULL	商品名称
goods_number	int(11) NULL	商品库存
goods_price	decimal(10,2) NULL	商品价格
goods_desc	varchar(255) NULL	商品描述
add_time	timestamp NULL	添加时间

3）订单表

Field	Type	Comment
order_id	bigint(50) NOT NULL	订单ID
user_id	bigint(50) NULL	用户ID
order_status	int(1) NULL	订单状态 0未确认 1已确认 2已取消 3无效 4退款
pay_status	int(1) NULL	支付状态 0未支付 1支付中 2已支付
shipping_status	int(1) NULL	发货状态 0未发货 1已发货 2已退货
address	varchar(255) NULL	收货地址
consignee	varchar(255) NULL	收货人
goods_id	bigint(50) NULL	商品ID
goods_number	int(11) NULL	商品数量
goods_price	decimal(10,2) NULL	商品价格
goods_amount	decimal(10,0) NULL	商品总价
shipping_fee	decimal(10,2) NULL	运费
order_amount	decimal(10,2) NULL	订单价格
coupon_id	bigint(50) NULL	优惠券ID
coupon_paid	decimal(10,2) NULL	优惠券
money_paid	decimal(10,2) NULL	已付金额
pay_amount	decimal(10,2) NULL	支付金额
add_time	timestamp NULL	创建时间
confirm_time	timestamp NULL	订单确认时间
pay_time	timestamp NULL	支付时间

4）订单商品日志表

Field	Type	Comment
goods_id	int(11) NOT NULL	商品ID
order_id	varchar(32) NOT NULL	订单ID
goods_number	int(11) NULL	库存数量
log_time	datetime NULL	记录时间

5）用户表

Field	Type	Comment
user_id	bigint(50) NOT NULL	用户ID
user_name	varchar(255) NULL	用户姓名
user_password	varchar(255) NULL	用户密码
user_mobile	varchar(255) NULL	手机号
user_score	int(11) NULL	积分
user_reg_time	timestamp NULL	注册时间
user_money	decimal(10,0) NULL	用户余额

6）用户余额日志表

Field	Type	Comment
user_id	bigint(50) NOT NULL	用户ID
order_id	bigint(50) NOT NULL	订单ID
money_log_type	int(1) NOT NULL	日志类型 1订单付款 2 订单退款
use_money	decimal(10,2) NULL	操作金额
create_time	timestamp NULL	日志时间

7）订单支付表

Field	Type	Comment
id	varchar(100) NOT NULL	主键
group_name	varchar(100) NULL	生产者组名
msg_topic	varchar(100) NULL	消息主题
msg_tag	varchar(100) NULL	Tag
msg_key	varchar(100) NULL	Key
msg_body	varchar(500) NULL	消息内容
msg_status	int(1) NULL	0:未处理;1:已经处理
create_time	timestamp NOT NULL	记录时间

8）MQ消息生产表

Field	Type	Comment
id	varchar(100) NOT NULL	主键
group_name	varchar(100) NULL	生产者组名
msg_topic	varchar(100) NULL	消息主题
msg_tag	varchar(100) NULL	Tag
msg_key	varchar(100) NULL	Key
msg_body	varchar(500) NULL	消息内容
msg_status	int(1) NULL	0:未处理;1:已经处理
create_time	timestamp NOT NULL	记录时间

9）MQ消息消费表

Field	Type	Comment
msg_id	varchar(50) NULL	消息ID
group_name	varchar(100) NOT NULL	消费者组名
msg_tag	varchar(100) NOT NULL	Tag
msg_key	varchar(100) NOT NULL	Key
msg_body	varchar(500) NULL	消息体
consumer_status	int(1) NULL	0:正在处理;1:处理成功;2:处理失败
consumer_times	int(1) NULL	消费次数
consumer_timestamp	timestamp NULL	消费时间
remark	varchar(500) NULL	备注

3.2 项目初始化

shop系统基于Maven进行项目管理

3.2.1 工程浏览

项目初始化.png

父工程：shop-parent
订单系统：shop-order-web
支付系统：shop-pay-web
优惠券服务：shop-coupon-service
订单服务：shop-order-service
支付服务：shop-pay-service
商品服务：shop-goods-service
用户服务：shop-user-service
实体类：shop-pojo
持久层：shop-dao
接口层：shop-api
工具工程：shop-common

共12个系统

3.2.2 工程关系

项目结构图.png

3.3 Mybatis逆向工程使用

1）代码生成

使用Mybatis逆向工程针对数据表生成CURD持久层代码

2）代码导入

将实体类导入到shop-pojo工程
在服务层工程中导入对应的Mapper类和对应配置文件

3.4 公共类介绍

ID生成器 IDWorker：Twitter雪花算法
异常处理类 CustomerException：自定义异常类

CastException：异常抛出类

常量类 ShopCode：系统状态类
响应实体类 Result：封装响应状态和响应信息

4. 下单业务

下单时序图(2).png

4.1 下单基本流程

1）接口定义

IOrderService

public interface IOrderService {
    /**
     * 确认订单
     * @param order
     * @return Result
     */
    Result confirmOrder(TradeOrder order);
}

2）业务类实现

@Slf4j
@Component
@Service(interfaceClass = IOrderService.class)
public class OrderServiceImpl implements IOrderService {

    @Override
    public Result confirmOrder(TradeOrder order) {
        //1.校验订单
       
        //2.生成预订单
       
        try {
            //3.扣减库存
            
            //4.扣减优惠券
           
            //5.使用余额
           
            //6.确认订单
            
            //7.返回成功状态
           
        } catch (Exception e) {
            //1.确认订单失败,发送消息
            
            //2.返回失败状态
        }

    }
}

3）校验订单

校验订单(2).png

private void checkOrder(TradeOrder order) {
        //1.校验订单是否存在
        if(order==null){
            CastException.cast(ShopCode.SHOP_ORDER_INVALID);
        }
        //2.校验订单中的商品是否存在
        TradeGoods goods = goodsService.findOne(order.getGoodsId());
        if(goods==null){
            CastException.cast(ShopCode.SHOP_GOODS_NO_EXIST);
        }
        //3.校验下单用户是否存在
        TradeUser user = userService.findOne(order.getUserId());
        if(user==null){
            CastException.cast(ShopCode.SHOP_USER_NO_EXIST);
        }
        //4.校验商品单价是否合法
        if(order.getGoodsPrice().compareTo(goods.getGoodsPrice())!=0){
            CastException.cast(ShopCode.SHOP_GOODS_PRICE_INVALID);
        }
        //5.校验订单商品数量是否合法
        if(order.getGoodsNumber()>=goods.getGoodsNumber()){
            CastException.cast(ShopCode.SHOP_GOODS_NUM_NOT_ENOUGH);
        }

        log.info("校验订单通过");
}

4）生成预订单

生成预订单.png

private Long savePreOrder(TradeOrder order) {
        //1.设置订单状态为不可见
        order.setOrderStatus(ShopCode.SHOP_ORDER_NO_CONFIRM.getCode());
        //2.订单ID
        order.setOrderId(idWorker.nextId());
        //核算运费是否正确
        BigDecimal shippingFee = calculateShippingFee(order.getOrderAmount());
        if (order.getShippingFee().compareTo(shippingFee) != 0) {
            CastException.cast(ShopCode.SHOP_ORDER_SHIPPINGFEE_INVALID);
        }
        //3.计算订单总价格是否正确
        BigDecimal orderAmount = order.getGoodsPrice().multiply(new BigDecimal(order.getGoodsNumber()));
        orderAmount.add(shippingFee);
        if (orderAmount.compareTo(order.getOrderAmount()) != 0) {
            CastException.cast(ShopCode.SHOP_ORDERAMOUNT_INVALID);
        }

        //4.判断优惠券信息是否合法
        Long couponId = order.getCouponId();
        if (couponId != null) {
            TradeCoupon coupon = couponService.findOne(couponId);
            //优惠券不存在
            if (coupon == null) {
                CastException.cast(ShopCode.SHOP_COUPON_NO_EXIST);
            }
            //优惠券已经使用
            if ((ShopCode.SHOP_COUPON_ISUSED.getCode().toString())
                .equals(coupon.getIsUsed().toString())) {
                CastException.cast(ShopCode.SHOP_COUPON_INVALIED);
            }
            order.setCouponPaid(coupon.getCouponPrice());
        } else {
            order.setCouponPaid(BigDecimal.ZERO);
        }

        //5.判断余额是否正确
        BigDecimal moneyPaid = order.getMoneyPaid();
        if (moneyPaid != null) {
            //比较余额是否大于0
            int r = order.getMoneyPaid().compareTo(BigDecimal.ZERO);
            //余额小于0
            if (r == -1) {
                CastException.cast(ShopCode.SHOP_MONEY_PAID_LESS_ZERO);
            }
            //余额大于0
            if (r == 1) {
                //查询用户信息
                TradeUser user = userService.findOne(order.getUserId());
                if (user == null) {
                    CastException.cast(ShopCode.SHOP_USER_NO_EXIST);
                }
            //比较余额是否大于用户账户余额
            if (user.getUserMoney().compareTo(order.getMoneyPaid().longValue()) == -1) {
                CastException.cast(ShopCode.SHOP_MONEY_PAID_INVALID);
            }
            order.setMoneyPaid(order.getMoneyPaid());
        }
    } else {
        order.setMoneyPaid(BigDecimal.ZERO);
    }
    //计算订单支付总价
    order.setPayAmount(orderAmount.subtract(order.getCouponPaid())
                       .subtract(order.getMoneyPaid()));
    //设置订单添加时间
    order.setAddTime(new Date());

    //保存预订单
    int r = orderMapper.insert(order);
    if (ShopCode.SHOP_SUCCESS.getCode() != r) {
        CastException.cast(ShopCode.SHOP_ORDER_SAVE_ERROR);
    }
    log.info("订单:["+order.getOrderId()+"]预订单生成成功");
    return order.getOrderId();
}

5）扣减库存

通过dubbo调用商品服务完成扣减库存

private void reduceGoodsNum(TradeOrder order) {
    TradeGoodsNumberLog goodsNumberLog = new TradeGoodsNumberLog();
    goodsNumberLog.setGoodsId(order.getGoodsId());
    goodsNumberLog.setOrderId(order.getOrderId());
    goodsNumberLog.setGoodsNumber(order.getGoodsNumber());
    Result result = goodsService.reduceGoodsNum(goodsNumberLog);
    if (result.getSuccess().equals(ShopCode.SHOP_FAIL.getSuccess())) {
        CastException.cast(ShopCode.SHOP_REDUCE_GOODS_NUM_FAIL);
    }
    log.info("订单:["+order.getOrderId()+"]扣减库存["+order.getGoodsNumber()+"个]成功");
}

商品服务GoodsService扣减库存

@Override
public Result reduceGoodsNum(TradeGoodsNumberLog goodsNumberLog) {
    if (goodsNumberLog == null ||
            goodsNumberLog.getGoodsNumber() == null ||
            goodsNumberLog.getOrderId() == null ||
            goodsNumberLog.getGoodsNumber() == null ||
            goodsNumberLog.getGoodsNumber().intValue() <= 0) {
        CastException.cast(ShopCode.SHOP_REQUEST_PARAMETER_VALID);
    }
    TradeGoods goods = goodsMapper.selectByPrimaryKey(goodsNumberLog.getGoodsId());
    if(goods.getGoodsNumber()<goodsNumberLog.getGoodsNumber()){
        //库存不足
        CastException.cast(ShopCode.SHOP_GOODS_NUM_NOT_ENOUGH);
    }
    //减库存
    goods.setGoodsNumber(goods.getGoodsNumber()-goodsNumberLog.getGoodsNumber());
    goodsMapper.updateByPrimaryKey(goods);


    //记录库存操作日志
    goodsNumberLog.setGoodsNumber(-(goodsNumberLog.getGoodsNumber()));
    goodsNumberLog.setLogTime(new Date());
    goodsNumberLogMapper.insert(goodsNumberLog);

    return new Result(ShopCode.SHOP_SUCCESS.getSuccess(),ShopCode.SHOP_SUCCESS.getMessage());
}

6）扣减优惠券

通过dubbo完成扣减优惠券

private void changeCoponStatus(TradeOrder order) {
    //判断用户是否使用优惠券
    if (!StringUtils.isEmpty(order.getCouponId())) {
        //封装优惠券对象
        TradeCoupon coupon = couponService.findOne(order.getCouponId());
        coupon.setIsUsed(ShopCode.SHOP_COUPON_ISUSED.getCode());
        coupon.setUsedTime(new Date());
        coupon.setOrderId(order.getOrderId());
        Result result = couponService.changeCouponStatus(coupon);
        //判断执行结果
        if (result.getSuccess().equals(ShopCode.SHOP_FAIL.getSuccess())) {
            //优惠券使用失败
            CastException.cast(ShopCode.SHOP_COUPON_USE_FAIL);
        }
        log.info("订单:["+order.getOrderId()+"]使用扣减优惠券["+coupon.getCouponPrice()+"元]成功");
    }

}

优惠券服务CouponService更改优惠券状态

@Override
public Result changeCouponStatus(TradeCoupon coupon) {
    try {
        //判断请求参数是否合法
        if (coupon == null || StringUtils.isEmpty(coupon.getCouponId())) {
            CastException.cast(ShopCode.SHOP_REQUEST_PARAMETER_VALID);
        }
		//更新优惠券状态为已使用
        couponMapper.updateByPrimaryKey(coupon);
        return new Result(ShopCode.SHOP_SUCCESS.getSuccess(), ShopCode.SHOP_SUCCESS.getMessage());
    } catch (Exception e) {
        return new Result(ShopCode.SHOP_FAIL.getSuccess(), ShopCode.SHOP_FAIL.getMessage());
    }
}

7）扣减用户余额

通过用户服务完成扣减余额

private void reduceMoneyPaid(TradeOrder order) {
    //判断订单中使用的余额是否合法
    if (order.getMoneyPaid() != null && order.getMoneyPaid().compareTo(BigDecimal.ZERO) == 1) {
        TradeUserMoneyLog userMoneyLog = new TradeUserMoneyLog();
        userMoneyLog.setOrderId(order.getOrderId());
        userMoneyLog.setUserId(order.getUserId());
        userMoneyLog.setUseMoney(order.getMoneyPaid());
        userMoneyLog.setMoneyLogType(ShopCode.SHOP_USER_MONEY_PAID.getCode());
        //扣减余额
        Result result = userService.changeUserMoney(userMoneyLog);
        if (result.getSuccess().equals(ShopCode.SHOP_FAIL.getSuccess())) {
            CastException.cast(ShopCode.SHOP_USER_MONEY_REDUCE_FAIL);
        }
        log.info("订单:["+order.getOrderId()+"扣减余额["+order.getMoneyPaid()+"元]成功]");
    }
}

用户服务UserService更新余额

更改用户余额.png

@Override
public Result changeUserMoney(TradeUserMoneyLog userMoneyLog) {
    //判断请求参数是否合法
    if (userMoneyLog == null
            || userMoneyLog.getUserId() == null
            || userMoneyLog.getUseMoney() == null
            || userMoneyLog.getOrderId() == null
            || userMoneyLog.getUseMoney().compareTo(BigDecimal.ZERO) <= 0) {
        CastException.cast(ShopCode.SHOP_REQUEST_PARAMETER_VALID);
    }

    //查询该订单是否存在付款记录
    TradeUserMoneyLogExample userMoneyLogExample = new TradeUserMoneyLogExample();
    userMoneyLogExample.createCriteria()
            .andUserIdEqualTo(userMoneyLog.getUserId())
            .andOrderIdEqualTo(userMoneyLog.getOrderId());
   int count = userMoneyLogMapper.countByExample(userMoneyLogExample);
   TradeUser tradeUser = new TradeUser();
   tradeUser.setUserId(userMoneyLog.getUserId());
   tradeUser.setUserMoney(userMoneyLog.getUseMoney().longValue());
   //判断余额操作行为
   //【付款操作】
   if (userMoneyLog.getMoneyLogType().equals(ShopCode.SHOP_USER_MONEY_PAID.getCode())) {
           //订单已经付款，则抛异常
           if (count > 0) {
                CastException.cast(ShopCode.SHOP_ORDER_PAY_STATUS_IS_PAY);
            }
       	   //用户账户扣减余额
           userMapper.reduceUserMoney(tradeUser);
       }
    //【退款操作】
    if (userMoneyLog.getMoneyLogType().equals(ShopCode.SHOP_USER_MONEY_REFUND.getCode())) {
         //如果订单未付款,则不能退款,抛异常
         if (count == 0) {
         CastException.cast(ShopCode.SHOP_ORDER_PAY_STATUS_NO_PAY);
     }
     //防止多次退款
     userMoneyLogExample = new TradeUserMoneyLogExample();
     userMoneyLogExample.createCriteria()
             .andUserIdEqualTo(userMoneyLog.getUserId())
                .andOrderIdEqualTo(userMoneyLog.getOrderId())
                .andMoneyLogTypeEqualTo(ShopCode.SHOP_USER_MONEY_REFUND.getCode());
     count = userMoneyLogMapper.countByExample(userMoneyLogExample);
     if (count > 0) {
         CastException.cast(ShopCode.SHOP_USER_MONEY_REFUND_ALREADY);
     }
     	//用户账户添加余额
        userMapper.addUserMoney(tradeUser);
    }


    //记录用户使用余额日志
    userMoneyLog.setCreateTime(new Date());
    userMoneyLogMapper.insert(userMoneyLog);
    return new Result(ShopCode.SHOP_SUCCESS.getSuccess(),ShopCode.SHOP_SUCCESS.getMessage());
}

8）确认订单

private void updateOrderStatus(TradeOrder order) {
    order.setOrderStatus(ShopCode.SHOP_ORDER_CONFIRM.getCode());
    order.setPayStatus(ShopCode.SHOP_ORDER_PAY_STATUS_NO_PAY.getCode());
    order.setConfirmTime(new Date());
    int r = orderMapper.updateByPrimaryKey(order);
    if (r <= 0) {
        CastException.cast(ShopCode.SHOP_ORDER_CONFIRM_FAIL);
    }
    log.info("订单:["+order.getOrderId()+"]状态修改成功");
}

9）小结

@Override
public Result confirmOrder(TradeOrder order) {
    //1.校验订单
    checkOrder(order);
    //2.生成预订单
    Long orderId = savePreOrder(order);
    order.setOrderId(orderId);
    try {
        //3.扣减库存
        reduceGoodsNum(order);
        //4.扣减优惠券
        changeCoponStatus(order);
        //5.使用余额
        reduceMoneyPaid(order);
        //6.确认订单
        updateOrderStatus(order);
        log.info("订单:["+orderId+"]确认成功");
        return new Result(ShopCode.SHOP_SUCCESS.getSuccess(), ShopCode.SHOP_SUCCESS.getMessage());
    } catch (Exception e) {
        //确认订单失败,发送消息
        ...
        return new Result(ShopCode.SHOP_FAIL.getSuccess(), ShopCode.SHOP_FAIL.getMessage());
    }
}

4.2 失败补偿机制

4.2.1 消息发送方

配置RocketMQ属性值

rocketmq.name-server=s201:9876;s202:9876
rocketmq.producer.group=orderProducerGroup

mq.order.consumer.group.name=order_orderTopic_cancel_group
mq.order.topic=orderTopic
mq.order.tag.confirm=order_confirm
mq.order.tag.cancel=order_cancel

注入模板类和属性值信息

 @Autowired
 private RocketMQTemplate rocketMQTemplate;

 @Value("${mq.order.topic}")
 private String topic;

 @Value("${mq.order.tag.cancel}")
 private String cancelTag;

发送下单失败消息

@Override
public Result confirmOrder(TradeOrder order) {
    //1.校验订单
    //2.生成预订
    try {
        //3.扣减库存
        //4.扣减优惠券
        //5.使用余额
        //6.确认订单
    } catch (Exception e) {
        //确认订单失败,发送消息
        CancelOrderMQ cancelOrderMQ = new CancelOrderMQ();
        cancelOrderMQ.setOrderId(order.getOrderId());
        cancelOrderMQ.setCouponId(order.getCouponId());
        cancelOrderMQ.setGoodsId(order.getGoodsId());
        cancelOrderMQ.setGoodsNumber(order.getGoodsNumber());
        cancelOrderMQ.setUserId(order.getUserId());
        cancelOrderMQ.setUserMoney(order.getMoneyPaid());
        try {
            sendMessage(topic, 
                        cancelTag, 
                        cancelOrderMQ.getOrderId().toString(), 
                    JSON.toJSONString(cancelOrderMQ));
    } catch (Exception e1) {
        e1.printStackTrace();
            CastException.cast(ShopCode.SHOP_MQ_SEND_MESSAGE_FAIL);
        }
        return new Result(ShopCode.SHOP_FAIL.getSuccess(), ShopCode.SHOP_FAIL.getMessage());
    }
}

private void sendMessage(String topic, String tags, String keys, String body) throws Exception {
    //判断Topic是否为空
    if (StringUtils.isEmpty(topic)) {
        CastException.cast(ShopCode.SHOP_MQ_TOPIC_IS_EMPTY);
    }
    //判断消息内容是否为空
    if (StringUtils.isEmpty(body)) {
        CastException.cast(ShopCode.SHOP_MQ_MESSAGE_BODY_IS_EMPTY);
    }
    //消息体
    Message message = new Message(topic, tags, keys, body.getBytes());
    //发送消息
    rocketMQTemplate.getProducer().send(message);
}

4.2.2 消费接收方

配置RocketMQ属性值

rocketmq.name-server=s201:9876;s202:9876
mq.order.consumer.group.name=order_orderTopic_cancel_group
mq.order.topic=orderTopic

创建监听类，消费消息

@Slf4j
@Component
@RocketMQMessageListener(topic = "${mq.order.topic}", 
                         consumerGroup = "${mq.order.consumer.group.name}",
                         messageModel = MessageModel.BROADCASTING)
public class CancelOrderConsumer implements RocketMQListener<MessageExt>{

    @Override
    public void onMessage(MessageExt messageExt) {
        ...
    }
}

1）回退库存

流程分析

回退库存.png

消息消费者

@Slf4j
@Component
@RocketMQMessageListener(topic = "${mq.order.topic}",consumerGroup = "${mq.order.consumer.group.name}",messageModel = MessageModel.BROADCASTING )
public class CancelMQListener implements RocketMQListener<MessageExt>{


    @Value("${mq.order.consumer.group.name}")
    private String groupName;

    @Autowired
    private TradeGoodsMapper goodsMapper;

    @Autowired
    private TradeMqConsumerLogMapper mqConsumerLogMapper;

    @Autowired
    private TradeGoodsNumberLogMapper goodsNumberLogMapper;

    @Override
    public void onMessage(MessageExt messageExt) {
        String msgId=null;
        String tags=null;
        String keys=null;
        String body=null;
        try {
            //1. 解析消息内容
            msgId = messageExt.getMsgId();
            tags= messageExt.getTags();
            keys= messageExt.getKeys();
            body= new String(messageExt.getBody(),"UTF-8");

            log.info("接受消息成功");

            //2. 查询消息消费记录
            TradeMqConsumerLogKey primaryKey = new TradeMqConsumerLogKey();
            primaryKey.setMsgTag(tags);
            primaryKey.setMsgKey(keys);
            primaryKey.setGroupName(groupName);
            TradeMqConsumerLog mqConsumerLog = mqConsumerLogMapper.selectByPrimaryKey(primaryKey);

            if(mqConsumerLog!=null){
                //3. 判断如果消费过...
                //3.1 获得消息处理状态
                Integer status = mqConsumerLog.getConsumerStatus();
                //处理过...返回
                if(ShopCode.SHOP_MQ_MESSAGE_STATUS_SUCCESS.getCode().intValue()==status.intValue()){
                    log.info("消息:"+msgId+",已经处理过");
                    return;
                }

                //正在处理...返回
                if(ShopCode.SHOP_MQ_MESSAGE_STATUS_PROCESSING.getCode().intValue()==status.intValue()){
                    log.info("消息:"+msgId+",正在处理");
                    return;
                }

                //处理失败
                if(ShopCode.SHOP_MQ_MESSAGE_STATUS_FAIL.getCode().intValue()==status.intValue()){
                    //获得消息处理次数
                    Integer times = mqConsumerLog.getConsumerTimes();
                    if(times>3){
                        log.info("消息:"+msgId+",消息处理超过3次,不能再进行处理了");
                        return;
                    }
                    mqConsumerLog.setConsumerStatus(ShopCode.SHOP_MQ_MESSAGE_STATUS_PROCESSING.getCode());

                    //使用数据库乐观锁更新
                    TradeMqConsumerLogExample example = new TradeMqConsumerLogExample();
                    TradeMqConsumerLogExample.Criteria criteria = example.createCriteria();
                    criteria.andMsgTagEqualTo(mqConsumerLog.getMsgTag());
                    criteria.andMsgKeyEqualTo(mqConsumerLog.getMsgKey());
                    criteria.andGroupNameEqualTo(groupName);
                    criteria.andConsumerTimesEqualTo(mqConsumerLog.getConsumerTimes());
                    int r = mqConsumerLogMapper.updateByExampleSelective(mqConsumerLog, example);
                    if(r<=0){
                        //未修改成功,其他线程并发修改
                        log.info("并发修改,稍后处理");
                    }
                }

            }else{
                //4. 判断如果没有消费过...
                mqConsumerLog = new TradeMqConsumerLog();
                mqConsumerLog.setMsgTag(tags);
                mqConsumerLog.setMsgKey(keys);
                mqConsumerLog.setGroupName(groupName);
                mqConsumerLog.setConsumerStatus(ShopCode.SHOP_MQ_MESSAGE_STATUS_PROCESSING.getCode());
                mqConsumerLog.setMsgBody(body);
                mqConsumerLog.setMsgId(msgId);
                mqConsumerLog.setConsumerTimes(0);

                //将消息处理信息添加到数据库
                mqConsumerLogMapper.insert(mqConsumerLog);
            }
            //5. 回退库存
            MQEntity mqEntity = JSON.parseObject(body, MQEntity.class);
            Long goodsId = mqEntity.getGoodsId();
            TradeGoods goods = goodsMapper.selectByPrimaryKey(goodsId);
            goods.setGoodsNumber(goods.getGoodsNumber()+mqEntity.getGoodsNum());
            goodsMapper.updateByPrimaryKey(goods);

            //记录库存操作日志
            TradeGoodsNumberLog goodsNumberLog = new TradeGoodsNumberLog();
            goodsNumberLog.setOrderId(mqEntity.getOrderId());
            goodsNumberLog.setGoodsId(goodsId);
            goodsNumberLog.setGoodsNumber(mqEntity.getGoodsNum());
            goodsNumberLog.setLogTime(new Date());
            goodsNumberLogMapper.insert(goodsNumberLog);

            //6. 将消息的处理状态改为成功
            mqConsumerLog.setConsumerStatus(ShopCode.SHOP_MQ_MESSAGE_STATUS_SUCCESS.getCode());
            mqConsumerLog.setConsumerTimestamp(new Date());
            mqConsumerLogMapper.updateByPrimaryKey(mqConsumerLog);
            log.info("回退库存成功");
        } catch (Exception e) {
            e.printStackTrace();
            TradeMqConsumerLogKey primaryKey = new TradeMqConsumerLogKey();
            primaryKey.setMsgTag(tags);
            primaryKey.setMsgKey(keys);
            primaryKey.setGroupName(groupName);
            TradeMqConsumerLog mqConsumerLog = mqConsumerLogMapper.selectByPrimaryKey(primaryKey);
            if(mqConsumerLog==null){
                //数据库未有记录
                mqConsumerLog = new TradeMqConsumerLog();
                mqConsumerLog.setMsgTag(tags);
                mqConsumerLog.setMsgKey(keys);
                mqConsumerLog.setConsumerStatus(ShopCode.SHOP_MQ_MESSAGE_STATUS_FAIL.getCode());
                mqConsumerLog.setMsgBody(body);
                mqConsumerLog.setMsgId(msgId);
                mqConsumerLog.setConsumerTimes(1);
                mqConsumerLogMapper.insert(mqConsumerLog);
            }else{
                mqConsumerLog.setConsumerTimes(mqConsumerLog.getConsumerTimes()+1);
                mqConsumerLogMapper.updateByPrimaryKeySelective(mqConsumerLog);
            }
        }

    }
}

2）回退优惠券

@Slf4j
@Component
@RocketMQMessageListener(topic = "${mq.order.topic}",consumerGroup = "${mq.order.consumer.group.name}",messageModel = MessageModel.BROADCASTING )
public class CancelMQListener implements RocketMQListener<MessageExt>{

    @Autowired
    private TradeCouponMapper couponMapper;

    @Override
    public void onMessage(MessageExt message) {
        try {
            //1. 解析消息内容
            String body = new String(message.getBody(), "UTF-8");
            MQEntity mqEntity = JSON.parseObject(body, MQEntity.class);
            log.info("接收到消息");
            //2. 查询优惠券信息
            TradeCoupon coupon = couponMapper.selectByPrimaryKey(mqEntity.getCouponId());
            //3.更改优惠券状态
            coupon.setUsedTime(null);
            coupon.setIsUsed(ShopCode.SHOP_COUPON_UNUSED.getCode());
            coupon.setOrderId(null);
            couponMapper.updateByPrimaryKey(coupon);
            log.info("回退优惠券成功");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
            log.error("回退优惠券失败");
        }
    }
}

3）回退余额

@Slf4j
@Component
@RocketMQMessageListener(topic = "${mq.order.topic}",consumerGroup = "${mq.order.consumer.group.name}",messageModel = MessageModel.BROADCASTING )
public class CancelMQListener implements RocketMQListener<MessageExt>{

    @Autowired
    private IUserService userService;

    @Override
    public void onMessage(MessageExt messageExt) {

        try {
            //1.解析消息
            String body = new String(messageExt.getBody(), "UTF-8");
            MQEntity mqEntity = JSON.parseObject(body, MQEntity.class);
            log.info("接收到消息");
            if(mqEntity.getUserMoney()!=null && mqEntity.getUserMoney().compareTo(BigDecimal.ZERO)>0){
                //2.调用业务层,进行余额修改
                TradeUserMoneyLog userMoneyLog = new TradeUserMoneyLog();
                userMoneyLog.setUseMoney(mqEntity.getUserMoney());
                userMoneyLog.setMoneyLogType(ShopCode.SHOP_USER_MONEY_REFUND.getCode());
                userMoneyLog.setUserId(mqEntity.getUserId());
                userMoneyLog.setOrderId(mqEntity.getOrderId());
                userService.updateMoneyPaid(userMoneyLog);
                log.info("余额回退成功");
            }
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
            log.error("余额回退失败");
        }
    }
}

4）取消订单

@Override
public void onMessage(MessageExt messageExt) {
    String body = new String(messageExt.getBody(), "UTF-8");
    String msgId = messageExt.getMsgId();
    String tags = messageExt.getTags();
    String keys = messageExt.getKeys();
    log.info("CancelOrderProcessor receive message:"+messageExt);
    CancelOrderMQ cancelOrderMQ = JSON.parseObject(body, CancelOrderMQ.class);
    TradeOrder order = orderService.findOne(cancelOrderMQ.getOrderId());
    order.setOrderStatus(ShopCode.SHOP_ORDER_CANCEL.getCode());
    orderService.changeOrderStatus(order);
    log.info("订单:["+order.getOrderId()+"]状态设置为取消");
    return order;
}

4.3 测试

1）准备测试环境

@RunWith(SpringRunner.class)
@SpringBootTest(classes = ShopOrderServiceApplication.class)
public class OrderTest {
    @Autowired
    private IOrderService orderService;
}

2）准备测试数据

用户数据
商品数据
优惠券数据

3）测试下单成功流程

@Test    
public void add(){
    Long goodsId=XXXL;
    Long userId=XXXL;
    Long couponId=XXXL;

    TradeOrder order = new TradeOrder();
    order.setGoodsId(goodsId);
    order.setUserId(userId);
    order.setGoodsNumber(1);
    order.setAddress("北京");
    order.setGoodsPrice(new BigDecimal("5000"));
    order.setOrderAmount(new BigDecimal("5000"));
    order.setMoneyPaid(new BigDecimal("100"));
    order.setCouponId(couponId);
    order.setShippingFee(new BigDecimal(0));
    orderService.confirmOrder(order);
}

执行完毕后,查看数据库中用户的余额、优惠券数据，及订单的状态数据

4）测试下单失败流程

代码同上。

执行完毕后，查看用户的余额、优惠券数据是否发生更改，订单的状态是否为取消。

5. 支付业务

5.1 创建支付订单

创建支付订单.png

public Result createPayment(TradePay tradePay) {
    //查询订单支付状态
    try {
        TradePayExample payExample = new TradePayExample();
        TradePayExample.Criteria criteria = payExample.createCriteria();
        criteria.andOrderIdEqualTo(tradePay.getOrderId());
        criteria.andIsPaidEqualTo(ShopCode.SHOP_ORDER_PAY_STATUS_IS_PAY.getCode());
        int count = tradePayMapper.countByExample(payExample);
        if (count > 0) {
            CastException.cast(ShopCode.SHOP_ORDER_PAY_STATUS_IS_PAY);
        }

        long payId = idWorker.nextId();
        tradePay.setPayId(payId);
        tradePay.setIsPaid(ShopCode.SHOP_ORDER_PAY_STATUS_NO_PAY.getCode());
        tradePayMapper.insert(tradePay);
        log.info("创建支付订单成功:" + payId);
    } catch (Exception e) {
        return new Result(ShopCode.SHOP_FAIL.getSuccess(), ShopCode.SHOP_FAIL.getMessage());
    }
    return new Result(ShopCode.SHOP_SUCCESS.getSuccess(), ShopCode.SHOP_SUCCESS.getMessage());
}

5.2 支付回调

5.2.1 流程分析

12.支付后回调.png

5.2.2 代码实现

public Result callbackPayment(TradePay tradePay) {

    if (tradePay.getIsPaid().equals(ShopCode.SHOP_ORDER_PAY_STATUS_IS_PAY.getCode())) {
        tradePay = tradePayMapper.selectByPrimaryKey(tradePay.getPayId());
        if (tradePay == null) {
            CastException.cast(ShopCode.SHOP_PAYMENT_NOT_FOUND);
        }
        tradePay.setIsPaid(ShopCode.SHOP_ORDER_PAY_STATUS_IS_PAY.getCode());
        int i = tradePayMapper.updateByPrimaryKeySelective(tradePay);
        //更新成功代表支付成功
        if (i == 1) {
            TradeMqProducerTemp mqProducerTemp = new TradeMqProducerTemp();
            mqProducerTemp.setId(String.valueOf(idWorker.nextId()));
            mqProducerTemp.setGroupName("payProducerGroup");
            mqProducerTemp.setMsgKey(String.valueOf(tradePay.getPayId()));
            mqProducerTemp.setMsgTag(topic);
            mqProducerTemp.setMsgBody(JSON.toJSONString(tradePay));
            mqProducerTemp.setCreateTime(new Date());
            mqProducerTempMapper.insert(mqProducerTemp);
            TradePay finalTradePay = tradePay;
            executorService.submit(new Runnable() {
                @Override
                public void run() {
                    try {
                        SendResult sendResult = sendMessage(topic, 
                                                            tag, 
                                                            finalTradePay.getPayId(), 
                                                            JSON.toJSONString(finalTradePay));
                        log.info(JSON.toJSONString(sendResult));
                        if (SendStatus.SEND_OK.equals(sendResult.getSendStatus())) {
                            mqProducerTempMapper.deleteByPrimaryKey(mqProducerTemp.getId());
                            System.out.println("删除消息表成功");
                        }
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            });
        } else {
            CastException.cast(ShopCode.SHOP_PAYMENT_IS_PAID);
        }
    }
    return new Result(ShopCode.SHOP_SUCCESS.getSuccess(), ShopCode.SHOP_SUCCESS.getMessage());
}

线程池优化消息发送逻辑

创建线程池对象

@Bean
public ThreadPoolTaskExecutor getThreadPool() {

    ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();

    executor.setCorePoolSize(4);

    executor.setMaxPoolSize(8);

    executor.setQueueCapacity(100);

    executor.setKeepAliveSeconds(60);

    executor.setThreadNamePrefix("Pool-A");

    executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());

    executor.initialize();

    return executor;

}

使用线程池

@Autowired
private ThreadPoolTaskExecutor executorService;

executorService.submit(new Runnable() {
    @Override
    public void run() {
        try {
            SendResult sendResult = sendMessage(topic, tag, finalTradePay.getPayId(), JSON.toJSONString(finalTradePay));
            log.info(JSON.toJSONString(sendResult));
            if (SendStatus.SEND_OK.equals(sendResult.getSendStatus())) {
                mqProducerTempMapper.deleteByPrimaryKey(mqProducerTemp.getId());
                System.out.println("删除消息表成功");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
});

5.2.3 处理消息

支付成功后，支付服务payService发送MQ消息，订单服务、用户服务、日志服务需要订阅消息进行处理

订单服务修改订单状态为已支付
日志服务记录支付日志
用户服务负责给用户增加积分

以下用订单服务为例说明消息的处理情况

1）配置RocketMQ属性值

mq.pay.topic=payTopic
mq.pay.consumer.group.name=pay_payTopic_group

2）消费消息

在订单服务中，配置公共的消息处理类

public class BaseConsumer {

    public TradeOrder handleMessage(IOrderService 
                                    orderService, 
                                    MessageExt messageExt,Integer code) throws Exception {
        //解析消息内容
        String body = new String(messageExt.getBody(), "UTF-8");
        String msgId = messageExt.getMsgId();
        String tags = messageExt.getTags();
        String keys = messageExt.getKeys();
        OrderMQ orderMq = JSON.parseObject(body, OrderMQ.class);
        
        //查询
        TradeOrder order = orderService.findOne(orderMq.getOrderId());

        if(ShopCode.SHOP_ORDER_MESSAGE_STATUS_CANCEL.getCode().equals(code)){
            order.setOrderStatus(ShopCode.SHOP_ORDER_CANCEL.getCode());
        }

        if(ShopCode.SHOP_ORDER_MESSAGE_STATUS_ISPAID.getCode().equals(code)){
            order.setPayStatus(ShopCode.SHOP_ORDER_PAY_STATUS_IS_PAY.getCode());
        }
        orderService.changeOrderStatus(order);
        return order;
    }

}

接受订单支付成功消息

@Slf4j
@Component
@RocketMQMessageListener(topic = "${mq.pay.topic}", 
                         consumerGroup = "${mq.pay.consumer.group.name}")
public class PayConsumer extends BaseConsumer implements RocketMQListener<MessageExt> {

    @Autowired
    private IOrderService orderService;

    @Override
    public void onMessage(MessageExt messageExt) {
        try {
            log.info("CancelOrderProcessor receive message:"+messageExt);
            TradeOrder order = handleMessage(orderService, 
                                             messageExt, 
                                             ShopCode.SHOP_ORDER_MESSAGE_STATUS_ISPAID.getCode());
            log.info("订单:["+order.getOrderId()+"]支付成功");
        } catch (Exception e) {
            e.printStackTrace();
            log.error("订单支付失败");
        }
    }
}

6. 整体联调

通过Rest客户端请求shop-order-web和shop-pay-web完成下单和支付操作

6.1 准备工作

1）配置RestTemplate类

@Configuration
public class RestTemplateConfig {

    @Bean
    @ConditionalOnMissingBean({ RestOperations.class, RestTemplate.class })
    public RestTemplate restTemplate(ClientHttpRequestFactory factory) {

        RestTemplate restTemplate = new RestTemplate(factory);

        // 使用 utf-8 编码集的 conver 替换默认的 conver（默认的 string conver 的编码集为"ISO-8859-1"）
        List<HttpMessageConverter<?>> messageConverters = restTemplate.getMessageConverters();
        Iterator<HttpMessageConverter<?>> iterator = messageConverters.iterator();
        while (iterator.hasNext()) {
            HttpMessageConverter<?> converter = iterator.next();
            if (converter instanceof StringHttpMessageConverter) {
                iterator.remove();
            }
        }
        messageConverters.add(new StringHttpMessageConverter(Charset.forName("UTF-8")));

        return restTemplate;
    }

    @Bean
    @ConditionalOnMissingBean({ClientHttpRequestFactory.class})
    public ClientHttpRequestFactory simpleClientHttpRequestFactory() {
        SimpleClientHttpRequestFactory factory = new SimpleClientHttpRequestFactory();
        // ms
        factory.setReadTimeout(15000);
        // ms
        factory.setConnectTimeout(15000);
        return factory;
    }
}

2）配置请求地址

订单系统

server.host=http://localhost
server.servlet.path=/order-web
server.port=8080
shop.order.baseURI=${server.host}:${server.port}${server.servlet.path}
shop.order.confirm=/order/confirm

支付系统

server.host=http://localhost
server.servlet.path=/pay-web
server.port=9090
shop.pay.baseURI=${server.host}:${server.port}${server.servlet.path}
shop.pay.createPayment=/pay/createPayment
shop.pay.callbackPayment=/pay/callbackPayment

6.2 下单测试

@RunWith(SpringRunner.class)
@ContextConfiguration(classes = ShopOrderWebApplication.class)
@TestPropertySource("classpath:application.properties")
public class OrderTest {

    @Autowired
    private RestTemplate restTemplate;

    @Value("${shop.order.baseURI}")
    private String baseURI;

    @Value("${shop.order.confirm}")
    private String confirmOrderPath;

    @Autowired
    private IDWorker idWorker;
   
   /**
     * 下单
     */
    @Test
    public void confirmOrder(){
        Long goodsId=XXXL;
        Long userId=XXXL;
        Long couponId=XXXL;

        TradeOrder order = new TradeOrder();
        order.setGoodsId(goodsId);
        order.setUserId(userId);
        order.setGoodsNumber(1);
        order.setAddress("北京");
        order.setGoodsPrice(new BigDecimal("5000"));
        order.setOrderAmount(new BigDecimal("5000"));
        order.setMoneyPaid(new BigDecimal("100"));
        order.setCouponId(couponId);
        order.setShippingFee(new BigDecimal(0));

        Result result = restTemplate.postForEntity(baseURI + confirmOrderPath, order, Result.class).getBody();
        System.out.println(result);
    }

}

6.3 支付测试

@RunWith(SpringRunner.class)
@ContextConfiguration(classes = ShopPayWebApplication.class)
@TestPropertySource("classpath:application.properties")
public class PayTest {

    @Autowired
    private RestTemplate restTemplate;

    @Value("${shop.pay.baseURI}")
    private String baseURI;

    @Value("${shop.pay.createPayment}")
    private String createPaymentPath;

    @Value("${shop.pay.callbackPayment}")
    private String callbackPaymentPath;

    @Autowired
    private IDWorker idWorker;

   /**
     * 创建支付订单
     */
    @Test
    public void createPayment(){

        Long orderId = 346321587315814400L;
        TradePay pay = new TradePay();
        pay.setOrderId(orderId);
        pay.setPayAmount(new BigDecimal(4800));

        Result result = restTemplate.postForEntity(baseURI + createPaymentPath, pay, Result.class).getBody();
        System.out.println(result);
    }
   
    /**
     * 支付回调
     */
    @Test
    public void callbackPayment(){
        Long payId = 346321891507720192L;
        TradePay pay = new TradePay();
        pay.setPayId(payId);
        pay.setIsPaid(ShopCode.SHOP_ORDER_PAY_STATUS_IS_PAY.getCode());
        Result result = restTemplate.postForEntity(baseURI + callbackPaymentPath, pay, Result.class).getBody();
        System.out.println(result);

    }

}

RocketMQ系列第二篇-案例实操篇

1. 案例介绍

1.1 业务分析

1）下单

2）支付

1.2 问题分析

问题1

问题2

2. 技术分析

2.1 技术选型

2.2 SpringBoot整合RocketMQ

2.2.1 消息生产者

1）添加依赖

2）配置文件

3）启动类

4）测试类

2.2.2 消息消费者

1）添加依赖

2）配置文件

3）启动类

2.3 SpringBoot整合Dubbo

2.3.1 搭建Zookeeper集群

1）准备工作

2）配置集群

3）启动集群

2.3.2 RPC服务接口

2.3.3 服务提供者

1）添加依赖

2）配置文件

3）启动类

4）服务实现

2.3.4 服务消费者

1）添加依赖

2）配置文件

3）启动类

4）Controller

3. 环境搭建

3.1 数据库

1）优惠券表

2）商品表

3）订单表

4）订单商品日志表

5）用户表

6）用户余额日志表

7）订单支付表

8）MQ消息生产表

9）MQ消息消费表

3.2 项目初始化

3.2.1 工程浏览

3.2.2 工程关系

3.3 Mybatis逆向工程使用

1）代码生成

2）代码导入

3.4 公共类介绍

4. 下单业务

4.1 下单基本流程

1）接口定义

2）业务类实现

3）校验订单

4）生成预订单

5）扣减库存

6）扣减优惠券

7）扣减用户余额

8）确认订单

9）小结

4.2 失败补偿机制

4.2.1 消息发送方

4.2.2 消费接收方

1）回退库存

2）回退优惠券

3）回退余额

4）取消订单

4.3 测试

1）准备测试环境

2）准备测试数据

3）测试下单成功流程

4）测试下单失败流程

5. 支付业务

5.1 创建支付订单

5.2 支付回调