RabbitMq 主题模式（Topic）

rabbitMq 主题模式介绍

主题模式可以简单的理解为可以动态路由，*代表一个单词，#可以代替零个或多个单词，单词最多 255 个字节，通过相关的匹配规则后就会将满足条件的消息放到对应的队列中，每个单词之间要用点隔开

TopicProducer编写

public class TopicProducer {
          
   

    public static void main(String[] args) throws Exception {
          
   
        Channel channel = RabbitMqUtils.getChannel();
        HashMap<String,String> hashMap=new HashMap<>(16);

        hashMap.put("a.orange.b","消费a.orange.b");
        hashMap.put("a.b.rabbit","消费a.b.rabbit");
        hashMap.put("lazy.orange.b.c","消费lazy.orange.b.c");
        for (Map.Entry<String,String> item:hashMap.entrySet()) {
          
   
			// 发送消息
            channel.basicPublish(TopicCustomerOne.EXCHANGE_NAME, item.getKey(), null, item.getValue().getBytes("UTF-8"));

        }

        System.out.println("消息发送");
    }
}

消费者One编写

当前消费者绑定的routingKey是*.orange.*一共三个单词

public class TopicCustomerOne {
          
   
    public static final String EXCHANGE_NAME="topic_log";

    public static void main(String[] args) throws Exception{
          
   
        Channel channel = RabbitMqUtils.getChannel();
        // 声明交换机
        channel.exchangeDeclare(EXCHANGE_NAME, BuiltinExchangeType.TOPIC);
        // 临时队列
        String queue = channel.queueDeclare().getQueue();
        // 绑定交换机
        channel.queueBind(queue,EXCHANGE_NAME,"*.orange.*");

        System.out.println("消息的接收.......");
        DeliverCallback deliverCallback = (String consumerTag, Delivery message) -> {
          
   
            System.out.println("消息消费: "+new String(message.getBody())+"  绑定的routingKey:  "+message.getEnvelope().getRoutingKey());
            // 手动应答
            channel.basicAck(message.getEnvelope().getDeliveryTag(),false);
        };
        CancelCallback cancelCallback=(consumerTag)->{
          
   
            System.out.println("消息消费被中断");
        };
        // 消费消息
        channel.basicConsume(queue,false,deliverCallback,cancelCallback);
    }
}

消费者Two编写

当前消费者绑定的routingKey是*.*.rabbit和lazy.#，以rabbit结尾的三个单词或者以lazy开头的单词组

public class TopicCustomerTwo {
          
   

    public static void main(String[] args) throws Exception{
          
   
        Channel channel = RabbitMqUtils.getChannel();
        // 声明交换机
        channel.exchangeDeclare(TopicCustomerOne.EXCHANGE_NAME, BuiltinExchangeType.TOPIC);
        // 临时队列
        String queue = channel.queueDeclare().getQueue();
        // 绑定交换机
        channel.queueBind(queue,TopicCustomerOne.EXCHANGE_NAME,"*.*.rabbit");
        // 绑定交换机
        channel.queueBind(queue,TopicCustomerOne.EXCHANGE_NAME,"lazy.#");

        System.out.println("消息的接收.......");
        DeliverCallback deliverCallback = (String consumerTag, Delivery message) -> {
          
   
            System.out.println("消息消费: "+new String(message.getBody())+"  绑定的routingKey:  "+message.getEnvelope().getRoutingKey());
            // 手动应答
            channel.basicAck(message.getEnvelope().getDeliveryTag(),false);
        };
        CancelCallback cancelCallback=(consumerTag)->{
          
   
            System.out.println("消息消费被中断");
        };
        // 消费消息
        channel.basicConsume(queue,false,deliverCallback,cancelCallback);
    }
}

启动项目

启动消费者发送消息

消费者One接收到的消息是匹配routingKey的

消费者Two接收到的消息是匹配routingKey的