RabbitMQ教程-Fanout Exchange类型的基本使用demo

不念不忘少年蓝@ 2023-01-07 03:50 163阅读 0赞

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### 使用Fanout Exchange广播一条消息 ###

*  先预备3个队列，创建队列有两种方式，第一种我们可以直接在代码里面创建好队列然后使用，也可以直接在我们的web界面里面去手动创建（但是web界面手动创建的时候要注意将我们的队列绑定到某个Exchange上，不然无法接受到消息）

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3hsZWNobw_size_16_color_FFFFFF_t_70]

创建好了队列，直接去Exchange上添加对应bind队列  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3hsZWNobw_size_16_color_FFFFFF_t_70 1]

*  创建一个生产者

package com.example.demo;
    
    import com.rabbitmq.client.Channel;
    import com.rabbitmq.client.Connection;
    import com.rabbitmq.client.ConnectionFactory;
    import com.rabbitmq.client.MessageProperties;
    
    import java.io.IOException;
    import java.util.concurrent.TimeoutException;
    
    /**
     * @author echo
     * @date 2021-01-14 14:35
     */
    public class FanoutProductTest {
        
    
        private static final String EXCHANGE_NAME = "exchange_fanout";
        private static final String IP_ADDRESS = "192.168.230.131";
        private static final int PORT = 5672;
    
        public static void main(String[] args) throws IOException, TimeoutException {
        
    
            // 创建连接工厂
            ConnectionFactory factory = new ConnectionFactory();
            // 设置RabbitMQ的链接参数
            factory.setHost(IP_ADDRESS);
            factory.setPort(PORT);
            factory.setUsername("echo");
            factory.setPassword("123456");
            // 和RabbitMQ建立一个链接
            Connection connection = factory.newConnection();
            // 创建一个频道
            Channel channel = connection.createChannel();
            // 创建一个 type="fanout" 、持久化的、非自动删除的交换器
            channel.exchangeDeclare(EXCHANGE_NAME, "fanout", true, false, null);
            // 如果没有在web界面手动创建队列，可以直接使用如下方式创建几个对应的队列
            // channel.queueDeclare("queue_fanout1", false, false, false, null);
            // channel.queueDeclare("queue_fanout2", false, false, false, null);
            // channel.queueDeclare("queue_fanout3", false, false, false, null);
            // 发送一条消息: hello world !
            String message = "Hello World !";
            channel.basicPublish(EXCHANGE_NAME, "", MessageProperties.PERSISTENT_TEXT_PLAIN, message.getBytes());
            // 关闭资源
            channel.close();
            connection.close();
    
        }
    
    }

运行之后我们就可以在远程看到我们的消息，三个队列都有了  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3hsZWNobw_size_16_color_FFFFFF_t_70 2]

*  创建一个消费者

package com.example.demo;
    
    import com.rabbitmq.client.*;
    import lombok.SneakyThrows;
    
    import java.io.IOException;
    import java.util.concurrent.TimeUnit;
    import java.util.concurrent.TimeoutException;
    
    /**
     * @author echo
     * @date 2021-01-14 15:05
     */
    public class FanoutConsumerTest {
        
    
        private static final String EXCHANGE_NAME = "exchange_fanout";
        private static final String QUEUE_NAME = "queue_fanout2";
        private static final String IP_ADDRESS = "192.168.230.131";
        private static final int PORT = 5672;
    
        public static void main(String[] args) throws IOException, TimeoutException, InterruptedException {
        
    
            Address[] addresses = new Address[]{
        new Address(IP_ADDRESS, PORT)};
            ConnectionFactory factory = new ConnectionFactory();
            // 设置RabbitMQ的链接参数
            factory.setUsername("echo");
            factory.setPassword("123456");
            factory.setPort(PORT);
            factory.setHost(IP_ADDRESS);
    
            // 和RabbitMQ建立一个链接
            Connection connection = factory.newConnection();
            final Channel channel = connection.createChannel();
            //声明交换机 Fanout模式
            channel.exchangeDeclare(EXCHANGE_NAME, BuiltinExchangeType.FANOUT, true, false, null);
            //进行绑定，指定消费那个队列
            channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, "", null);
    
            Consumer consumer = new DefaultConsumer(channel) {
        
                @SneakyThrows
                @Override
                public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) {
        
                    System.out.println("recv message: " + new String(body));
                    try {
        
                        TimeUnit.SECONDS.sleep(1);
                    } catch (InterruptedException e) {
        
                        e.printStackTrace();
                    }
                    channel.basicAck(envelope.getDeliveryTag(), false);
                }
            };
            channel.basicConsume(QUEUE_NAME, consumer);
            //等待回调函数执行完毕之后 关闭资源
            TimeUnit.SECONDS.sleep(5);
            channel.close();
            connection.close();
        }
    }

运行一下，我们就可以看到我们拿到了生产者对应的消息啦

![在这里插入图片描述][20210115145537709.png]

### 总结 ###

该类型可以直接广播，我们可以通过这种方式对一些有多个订阅元的需求进行应用

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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3hsZWNobw_size_16_color_FFFFFF_t_70 1]: /images/20221119/21cfaab648bd40a7a3c2ef4818f6fd25.png
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[20210115145537709.png]: https://img-blog.csdnimg.cn/20210115145537709.png