RabbitMQ 发布和订阅

来源：互联网发布：疯狂的美图美工助手编辑：程序博客网时间：2024/05/16 12:03

发布和订阅：一个消息转发给多个消费者；

生产者并不是将消息直接发送给消息队列，而是发送给交换机，由交换机根据规则发送给指定的消息队列或丢弃。

临时队列：当没有消费者链接时候，队列的消息会被丢弃，队列会被自动删除。

消息发布者：

package pub.exch;import java.io.IOException;import com.rabbitmq.client.Channel;import com.rabbitmq.client.Connection;import com.rabbitmq.client.ConnectionFactory;public class SendLog {private static final String EXCHANGE_NAME="logs";public static void main(String[] args) throws IOException {ConnectionFactory factory = new ConnectionFactory();factory.setHost("localhost");Connection connection = factory.newConnection();Channel channel = connection.createChannel();//定义交换机，第一个参数为交换机名称，第二个参数为交换机类型channel.exchangeDeclare(EXCHANGE_NAME, "fanout");String msg="hello word";channel.basicPublish(EXCHANGE_NAME, "", null, msg.getBytes()); System.out.println(" [x] Sent '"+msg+"'");channel.close();connection.close();}}

消息订阅者1

package pub.exch;import java.io.IOException;import com.rabbitmq.client.Channel;import com.rabbitmq.client.Connection;import com.rabbitmq.client.ConnectionFactory;import com.rabbitmq.client.ConsumerCancelledException;import com.rabbitmq.client.QueueingConsumer;import com.rabbitmq.client.ShutdownSignalException;public class ReqvLog {private static final String EXCHANGE_NAME="logs";public static void main(String[] args) throws IOException, ShutdownSignalException, ConsumerCancelledException, InterruptedException {ConnectionFactory factory = new ConnectionFactory();factory.setHost("localhost");Connection connection = factory.newConnection();Channel channel = connection.createChannel();channel.exchangeDeclare(EXCHANGE_NAME, "fanout");//获取自动创建的消息队列（临时队列）名称String queueName = channel.queueDeclare().getQueue();//绑定临时消息队列和交换机channel.queueBind(queueName, EXCHANGE_NAME, "");System.out.println(" [*] Waiting for messages. To exit press CTRL+C");QueueingConsumer consumer = new QueueingConsumer(channel);channel.basicConsume(queueName, true,consumer);while(true){QueueingConsumer.Delivery delivery=consumer.nextDelivery();String message=new String(delivery.getBody());System.out.println(" [x] Received '" + message + "'");}}}

消息订阅者2

package pub.exch;import java.io.IOException;import com.rabbitmq.client.Channel;import com.rabbitmq.client.Connection;import com.rabbitmq.client.ConnectionFactory;import com.rabbitmq.client.ConsumerCancelledException;import com.rabbitmq.client.QueueingConsumer;import com.rabbitmq.client.ShutdownSignalException;public class ReqvLog1 {private static final String EXCHANGE_NAME="logs";public static void main(String[] args) throws IOException, ShutdownSignalException, ConsumerCancelledException, InterruptedException {ConnectionFactory factory = new ConnectionFactory();factory.setHost("localhost");Connection connection = factory.newConnection();Channel channel = connection.createChannel();channel.exchangeDeclare(EXCHANGE_NAME, "fanout");//获取自动创建的消息队列（临时队列）名称String queueName = channel.queueDeclare().getQueue();//绑定临时消息队列和交换机channel.queueBind(queueName, EXCHANGE_NAME, "");System.out.println(" [*] Waiting for messages. To exit press CTRL+C");QueueingConsumer consumer = new QueueingConsumer(channel);channel.basicConsume(queueName, true,consumer);while(true){QueueingConsumer.Delivery delivery=consumer.nextDelivery();String message=new String(delivery.getBody());System.out.println(" [x1] Received '" + message + "'");}}}

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