消息中间件--RabbitMQ学习（五）

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最新推荐文章于 2024-07-09 22:13:40 发布

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分类专栏： RabbitMQ 文章标签：消息中间件 RabbitMQ

本文链接：https://blog.youkuaiyun.com/weixin_39218894/article/details/83579022

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本文深入讲解了TopicExchange的使用方法，包括如何通过模糊匹配路由键将消息转发到特定队列，以及生产者和消费者的具体代码实现。理解TopicExchange有助于更灵活地管理消息队列的路由策略。

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Topic Exchange使用

介绍Topic Exchangey

所有发送到 Topic Exchange的消息被转发到所有关心 Routekeyl中指定 Topici的 Queue上
Exchange将 Routekey和某 Topic进行模糊匹配此时队列需要绑定一个 Topic
符号“#”匹配一个或多个词，符号 * 匹配不多不少一个词例如:“log.#”能够匹配到” log. info.oa"og.*”只会匹配到"log.erro

具体代码实现

消费端

public class CunsumerForTopic {

    public static void main(String[] args) throws Exception{
        //1 创建一个connectionFactory
        ConnectionFactory connectionFactory = new ConnectionFactory();
        connectionFactory.setHost("192.168.0.159");
        connectionFactory.setPort(5672);
        connectionFactory.setVirtualHost("/");
        //2通过连接工场创建连接
        Connection connection = connectionFactory.newConnection();
        //3通过connection创建channel
        Channel channel = connection.createChannel();
        String exchangeName = "test_topic_exchange";
        String exchangeType = "topic";
        String queueName = "test_topic_queue";
        String routingKey = "user.*";
        channel.exchangeDeclare(exchangeName,exchangeType,true,false,false,null);
        channel.queueDeclare(queueName,false,false,false,null);
        channel.queueBind(queueName,exchangeName,routingKey);
        QueueingConsumer consumer = new QueueingConsumer(channel);
        channel.basicConsume(queueName,true,consumer);
        while (true){
            QueueingConsumer.Delivery delivery = consumer.nextDelivery();
            String msg = new String(delivery.getBody());
            System.out.println("收到消息：" + msg);
        }

    }
}

生产端

public class ProducterForTopic {
    public static void main(String[] args) throws Exception{
        //1 创建一个connectionFactory
        ConnectionFactory connectionFactory = new ConnectionFactory();
        connectionFactory.setHost("192.168.0.159");
        connectionFactory.setPort(5672);
        connectionFactory.setVirtualHost("/");
        //2通过连接工场创建连接
        Connection connection = connectionFactory.newConnection();
        //3通过connection创建channel
        Channel channel = connection.createChannel();
        String exchangeName = "test_topic_exchange";
        String routingKey1 = "user.save";
        String routingKey2 = "user.update";
        String routingKey3 = "user.delete.abc";
        String msg = "hello";
        channel.basicPublish(exchangeName,routingKey1,null,msg.getBytes());
        channel.basicPublish(exchangeName,routingKey2,null,msg.getBytes());
        channel.basicPublish(exchangeName,routingKey3,null,msg.getBytes());

    }
}