RabbitMQ_3、发布/订阅

发布订阅

官方例子

一次向多个消费者发送消息

send类

/**
* Actively declare a non-autodelete exchange with no extra arguments
* @see com.rabbitmq.client.AMQP.Exchange.Declare
* @see com.rabbitmq.client.AMQP.Exchange.DeclareOk
* @param exchange the name of the exchange
* @param type the exchange type
* @param durable true if we are declaring a durable exchange (the exchange will survive a server restart)
* @throws java.io.IOException if an error is encountered
* @return a declaration-confirm method to indicate the exchange was successfully declared
*/
Exchange.DeclareOk exchangeDeclare(String exchange, String type, boolean durable) throws IOException;

/**
 * @PackageName : com.rzk
 * @FileName : Send
 * @Description : 发布订阅-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_fanout";

    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.FANOUT);
                String message = " 发布  ";
                //队列消息的生产者:发送消息
                channel.basicPublish(EXCHANGE_NAME, "", null, message.getBytes(StandardCharsets.UTF_8));
                System.out.println(" [x] Sent '" + message + "'");
            }
    }
}

Recv1

/**
 * @PackageName : com.rzk.simple.recv
 * @FileName : Recv
 * @Description : 发布/订阅-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_fanout";

    public static void main(String[] argv) throws Exception {
        //创建工厂
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("*");
        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();
        //队列绑定交换机
        channel.exchangeDeclare(EXCHANGE_NAME, BuiltinExchangeType.FANOUT);
        //获取队列(排他队列
        String queueName = channel.queueDeclare().getQueue();
        //绑定队列和交换机
        channel.queueBind(queueName,EXCHANGE_NAME,"");


        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 -> { });
    }
}

Recv02

/**
 * @PackageName : com.rzk.simple.recv
 * @FileName : Recv
 * @Description : 发布/订阅-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_fanout";

    public static void main(String[] argv) throws Exception {
        //创建工厂
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("*");
        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.FANOUT);
        //获取队列(排他队列)
        String queueName = channel.queueDeclare().getQueue();
        //绑定队列和交换机
        channel.queueBind(queueName,EXCHANGE_NAME,"");


        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 -> { });
    }
}