RabbitMQ_5、主题模式

主题模式

基于模式（主题）接收消息

*（星号）可以正好代替一个词。
# (hash) 可以代替零个或多个单词。

路由键设置为“ quick.orange.rabbit ”的消息将发送到两个队列
消息“ lazy.orange.elephant ”也会发给他们两个。
另一方面，“ quick.orange.fox ”只会进入第一个队列，而“ lazy.brown.fox ”只会进入第二个队列。
“ lazy.pink.rabbit ”只会被传送到第二个队列一次，即使它匹配了两个绑定。
“ quick.brown.fox ”不匹配任何绑定，因此将被丢弃。
如果我们违反約定并发送一到四个字的消息，例如“ orange ”或“ quick.orange.male.rabbit ”，会发生什么？好吧，这些消息不会匹配任何绑定并且会丢失。
另一方面，“ lazy.orange.male.rabbit ”，即使它有四个单词，也会匹配最后一个绑定，并将被传递到第二个队列。

主題隊列 消息生產者

String infoRoutingKey = "info.message.orange";
String errorRoutingKey = "error.rabbit.lazy";
String warningRoutingKey = "orange.warning.message";

/**
 * @PackageName : com.rzk
 * @FileName : Send
 * @Description : 主题队列-消息生产者
 * @Author : rzk
 * @CreateTime : 23/6/2021 上午12:21
 * @Version : 1.0.0
 */
public class Send {

    //定义交换机名称
    private final static String EXCHANGE_NAME = "exchange_topic";

    public static void main(String[] argv) throws Exception {
        //创建连接工厂
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("*");
        factory.setUsername("yeb");
        factory.setVirtualHost("/yeb");
        factory.setPassword("yeb");
        factory.setPort(5672);

        try (
                //连接工厂创建连接
                Connection connection = factory.newConnection();
                //创建信道
                Channel channel = connection.createChannel()) {
                //绑定交换机
                channel.exchangeDeclare(EXCHANGE_NAME, BuiltinExchangeType.TOPIC);
                //
                String infoMessage = " 普通消息  ";
                String errorMessage = " 错误消息  ";
                String warningMessage = " 警告消息  ";
                //需要准备对应的路由
                String infoRoutingKey = "info.message.orange";
                String errorRoutingKey = "error.rabbit.lazy";
                String warningRoutingKey = "orange.warning.message";
                //队列消息的生产者:发送消息
                channel.basicPublish(EXCHANGE_NAME, infoRoutingKey, null, infoMessage.getBytes(StandardCharsets.UTF_8));
                channel.basicPublish(EXCHANGE_NAME, errorRoutingKey, null, errorMessage.getBytes(StandardCharsets.UTF_8));
                channel.basicPublish(EXCHANGE_NAME, warningRoutingKey, null, warningMessage.getBytes(StandardCharsets.UTF_8));
                System.out.println(" [x] Sent '" + infoMessage + "'");
                System.out.println(" [x] Sent '" + errorMessage + "'");
                System.out.println(" [x] Sent '" + warningMessage + "'");
            }
    }
}

消息接收

topic1會匹配到以下兩個：String infoRoutingKey = "info.message.orange";
String warningRoutingKey = "orange.warning.message";

主题队列 topic1

/**
 * @PackageName : com.rzk.simple.recv
 * @FileName : Recv
 * @Description : 主题队列-消息接收
 * @Author : rzk
 * @CreateTime : 23/6/2021 上午12:22
 * @Version : 1.0.0
 */
public class Recv01 {
    private final static String EXCHANGE_NAME = "exchange_topic";

    public static void main(String[] argv) throws Exception {
        //创建工厂
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("120.55.192.186");
        factory.setUsername("yeb");
        factory.setVirtualHost("/yeb");
        factory.setPassword("yeb");
        factory.setPort(5672);
        //连接工厂创建连接
        Connection connection = factory.newConnection();
        //创建信道
        Channel channel = connection.createChannel();
        //绑定交换机
        channel.exchangeDeclare(EXCHANGE_NAME, BuiltinExchangeType.TOPIC);
        //获取队列(排他队列
        String queueName = channel.queueDeclare().getQueue();
        //队列绑定交换机
        String errorRoutingKey = "#.message.#";
        channel.queueBind(queueName,EXCHANGE_NAME,errorRoutingKey);

        System.out.println(" [*] Waiting for messages. To exit press CTRL+C");

        DeliverCallback deliverCallback = (consumerTag, delivery) -> {
            String message = new String(delivery.getBody(), "UTF-8");
            System.out.println(" [x] Received '" + message + "'");
        };
        /**
         * 监听队列消费消息
         * autoAck:自动应答
         * 当消费者收到该消息,会返回通知消息队列 我消费者已经收到消息了
         */
        channel.basicConsume(queueName, false, deliverCallback, consumerTag -> { });
    }
}

主题队列 topic2

topic2匹配的是error：String errorRoutingKey = "error.rabbit.lazy";

/**
 * @PackageName : com.rzk.simple.recv
 * @FileName : Recv
 * @Description : 主题队列-消息接收
 * @Author : rzk
 * @CreateTime : 23/6/2021 上午12:22
 * @Version : 1.0.0
 */
public class Recv02 {
    private final static String EXCHANGE_NAME = "exchange_topic";

    public static void main(String[] argv) throws Exception {
        //创建工厂
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("120.55.192.186");
        factory.setUsername("yeb");
        factory.setVirtualHost("/yeb");
        factory.setPassword("yeb");
        factory.setPort(5672);
        //连接工厂创建连接
        Connection connection = factory.newConnection();
        //创建信道
        Channel channel = connection.createChannel();
        //绑定交换机
        channel.exchangeDeclare(EXCHANGE_NAME, BuiltinExchangeType.TOPIC);
        //获取队列(排他队列)
        String queueName = channel.queueDeclare().getQueue();
        //队列绑定交换机
        String routingKey = "*.rabbit.*";
        channel.queueBind(queueName,EXCHANGE_NAME,routingKey);

        System.out.println(" [*] Waiting for messages. To exit press CTRL+C");

        DeliverCallback deliverCallback = (consumerTag, delivery) -> {
            String message = new String(delivery.getBody(), "UTF-8");
            System.out.println(" [x] Received '" + message + "'");
        };
        //监听队列消费消息
        channel.basicConsume(queueName, false, deliverCallback, consumerTag -> { });
    }
}