项目架构如下

服务层代码如下

@Service
@RabbitListener(bindings = @QueueBinding(
        value = @Queue(value = "email.topic.queue",durable = "true",autoDelete = "false"),
        exchange = @Exchange(value = "topic_order_exchange",type = ExchangeTypes.TOPIC),
        key = "*.email.#"
))
public class TopicEmailConsumer {@RabbitHandlerpublic void receiveMessage(String message) {System.out.println("email fanout--接收到的订单信息是：->" + message);}
}

@Service
@RabbitListener(bindings = @QueueBinding(
 value = @Queue(value = "sms.topic.queue",durable = "true",autoDelete = "false"),
  exchange = @Exchange(value = "topic_order_exchange",type = ExchangeTypes.TOPIC),
  key = "#.sms.#"
))
public class TopicSMSConsumer {@RabbitHandlerpublic void receiveMessage(String message) {System.out.println("sms fanout--接收到的订单信息是：->" + message);}
}

@Service
@RabbitListener(bindings = @QueueBinding(
 value = @Queue(value = "weChat.topic.queue",durable = "true",autoDelete = "false"),
  exchange = @Exchange(value = "topic_order_exchange",type = ExchangeTypes.TOPIC),
  key = "weChat.#"
))
public class TopicWeChatConsumer {@RabbitHandlerpublic void receiveMessage(String message) {System.out.println("weChat fanout--接收到的订单信息是：->" + message);}
}

这里使用的是 RabbitMQ 提供的注解的方式来进行队列和交换机进行绑定，启动消费者，可以看到创建了 Topic 类型的交换机，并且进行了交换机的绑定。

消费者代码如下

public void makeOrderTopic(String userId,String productId,int num) {// 1:根据id查询商品是否充足// 2:保存订单String orderId = UUID.randomUUID().toString();System.out.println("订单生成成功："+orderId);// 3:通过 MQ 来完成消息的分发// 交换机，路由 key/queue 队列名称，消息内容String exchangeName = "topic_order_exchange";String routingKey = "com.email.sms";
        rabbitTemplate.convertAndSend(exchangeName,routingKey,orderId);}