RabbitMQ 发布-订阅队列

应用场景：让所有的消费者都能接受相同的消息。比如：微信公众号等。

1.创建Send.java:

package com.ckfuture.exchanges.send;

import com.rabbitmq.client.BuiltinExchangeType;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;

import java.nio.charset.StandardCharsets;

/**
 * 发布/订阅队列-消息生产者
 */
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();
        //连接工厂的地址
        factory.setHost("localhost");
        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 = "Hello World!";
                //发送消息
                channel.basicPublish(EXCHANGE_NAME, "", null, message.getBytes(StandardCharsets.UTF_8));
                System.out.println(" [x] Sent '" + message + "'");


        }
    }
}

2.创建Recv01.java

package com.ckfuture.exchanges.recv;

import com.rabbitmq.client.*;

/**
 * 发布/订阅-消息消费者
 */
public class Recv01 {

    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("localhost");
        //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,"");

        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 + "'");

        };
        channel.basicConsume(queueName, true, deliverCallback, consumerTag -> { });
    }
}

3.创建Recv02.java

package com.ckfuture.exchanges.recv;

import com.rabbitmq.client.*;

/**
 * 发布/订阅-消息消费者
 */
public class Recv02 {

    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("localhost");
        //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,"");

        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 + "'");
        };
        channel.basicConsume(queueName, true, deliverCallback, consumerTag -> { });
    }
}