Spring Boot + RabbitMQ(消息中间件)实现订单超时自动取消功能

如何订单超时实现？

• 定时任务
• redission延时任务
• rabbitmq死信队列

# 后台启动
rabbitmq-server -detached
# 添加用户
rabbitmqctl add_user root 123456
# 设置用户权限：
rabbitmqctl set_permissions -p "/" root ".*" ".*" ".*"

project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    modelVersion>4.0.0modelVersion>
    parent>
        groupId>org.springframework.bootgroupId>
        artifactId>spring-boot-starter-parentartifactId>
        version>2.2.8.RELEASEversion>
        relativePath/> 
    parent>
    groupId>com.lagougroupId>
    artifactId>rabbitmq-workartifactId>
    version>0.0.1-SNAPSHOTversion>
    name>rabbitmq-workname>
    description>Demo project for Spring Bootdescription>
    properties>
        java.version>1.8java.version>
    properties>
    dependencies>
        dependency>
            groupId>org.springframework.bootgroupId>
            artifactId>spring-boot-starter-amqpartifactId>
        dependency>
        dependency>
            groupId>org.springframework.bootgroupId>
            artifactId>spring-boot-starter-data-redisartifactId>
        dependency>
        dependency>
            groupId>org.springframework.bootgroupId>
            artifactId>spring-boot-starter-webartifactId>
        dependency>
        dependency>
            groupId>mysqlgroupId>
            artifactId>mysql-connector-javaartifactId>
            version>5.1.47version>
            scope>runtimescope>
        dependency>
        
        dependency>
            groupId>com.baomidougroupId>
            artifactId>mybatis-plus-boot-starterartifactId>
            version>3.3.2version>
        dependency>

        dependency>
            groupId>org.springframework.bootgroupId>
            artifactId>spring-boot-starter-testartifactId>
            scope>testscope>
        dependency>

    dependencies>

    build>
        plugins>
            plugin>
                groupId>org.springframework.bootgroupId>
                artifactId>spring-boot-maven-pluginartifactId>
            plugin>
        plugins>
    build>

project>

spring:
  application:
    name: rabbit-work
  # rabbitmq配置
  rabbitmq:
    host: localhost
    virtual-host: /
    username: root
    password: 123456
  # redis配置
  redis:
    timeout: 6000
    host: localhost
    port: 6379
    database: 0
  # 数据源配置
  datasource:
    url: jdbc:mysql://localhost:3306/order?useUnicode=true&characterEncoding=utf8&useSSL=false
    driver-class-name: com.mysql.jdbc.Driver
    username: root
    password: 123456
    hikari:
      minimum-idle: 3
      maximum-pool-size: 5
      max-lifetime: 30000
      connection-init-sql: SELECT 1
# mybatis-plus配置
mybatis-plus:
  mapper-locations: classpath:com.lagou.*.mapper/*.xml
  type-aliases-package: com.lagou.*.domain

定义RabbitConfig

@Configuration
public class RabbitConfig {

    /**
     * 订单队列
     *
     * @return {@link Queue}
     */
    @Bean
    public Queue orderQueue() {
        Map argments = new HashMap();
        argments.put("x-message-ttl", 60000);
        argments.put("x-dead-letter-exchange", RabbitConstants.ORDER_DLX_EXCHANGE);
        argments.put("x-dead-letter-routing-key", RabbitConstants.ORDER_DLX_ROUTING_KEY);
        Queue queue = new Queue(RabbitConstants.ORDER_QUEUE, true, false, false, argments);
        return queue;
    }

    /**
     * 订单交换机
     *
     * @return {@link Exchange}
     */
    @Bean
    public Exchange orderExchange() {
        return new DirectExchange(RabbitConstants.ORDER_EXCHANGE, true, false, null);
    }

    /**
     * 订单路由键
     *
     * @return {@link Binding}
     */
    @Bean
    public Binding orderRouting() {
        return BindingBuilder.bind(orderQueue()).to(orderExchange()).with(RabbitConstants.ORDER_ROUTING_KEY).noargs();
    }

    /**
     * 订单死信队列
     *
     * @return {@link Queue}
     */
    @Bean
    public Queue orderDlxQueue() {
        Queue queue = new Queue(RabbitConstants.ORDER_DLX_QUEUE, true, false, false);
        return queue;
    }

    /**
     * 订单死信交换机
     *
     * @return {@link Exchange}
     */
    @Bean
    public Exchange orderDlxExchange() {
        return new DirectExchange(RabbitConstants.ORDER_DLX_EXCHANGE, true, false, null);
    }

    /**
     * 订单死信路由键
     *
     * @return {@link Binding}
     */
    @Bean
    public Binding orderDlxRouting() {
        return BindingBuilder.bind(orderDlxQueue()).to(orderDlxExchange()).with(RabbitConstants.ORDER_DLX_ROUTING_KEY).noargs();
    }

    /**
     * 库存队列
     *
     * @return {@link Queue}
     */
    @Bean
    public Queue stockQueue() {
        return new Queue(RabbitConstants.STOCK_QUEUE, true, false, false, null);
    }

    /**
     * 库存交换机
     *
     * @return {@link Exchange}
     */
    @Bean
    public Exchange stockExchange() {
        return new DirectExchange(RabbitConstants.STOCK_EXCHANGE, true, false, null);
    }

    /**
     * 库存路由键
     *
     * @return {@link Binding}
     */
    @Bean
    public Binding stockRouting() {
        return BindingBuilder.bind(stockQueue()).to(stockExchange()).with(RabbitConstants.STOCK_ROUTING_KEY).noargs();
    }

}

实现消息发送

@RequestMapping(value = "/submit", produces = "application/json;charset=UTF-8")
public R submit(@RequestBody OrderVo orderVo) throws UnsupportedEncodingException {
	Order order = orderService.createOrder(orderVo);
	System.out.println("OrderController.submit... createOrder");

	// 放入死信队列
	amqpTemplate.convertAndSend(RabbitConstants.ORDER_EXCHANGE,
			RabbitConstants.ORDER_ROUTING_KEY,
			(order.getId() + ""));
	System.out.println("OrderController.submit... sendMessage to orderExchange");
	return R.ok(order);
}

消息消费者监听

@Component
public class OrderHandler {

    @Autowired
    private OrderService orderService;

    @RabbitListener(queues = RabbitConstants.ORDER_DLX_QUEUE, ackMode = "MANUAL")
    public void onMessage(Message message, Channel channel) throws IOException {
        System.out.println("消息进入死信队列...");
        String s = new String(message.getBody());
        Order o = orderService.getById(Long.parseLong(s));
        if (o != null && OrderConstants.TOPAID.getCode().equals(o.getOrderState())) {
            Order order = new Order();
            order.setId(o.getId());
            order.setOrderState(OrderConstants.CANCEL.getCode());
            order.setGmtModified(new Date());
            orderService.updateById(order);
        }
        // 手动ack
        channel.basicAck(message.getMessageProperties().getDeliveryTag(), false);
    }
}