江苏龙网

  1. 主页 > 生活百科 > >

RabbitMQ——最常用的三大模式

RabbitMQ

Direct 模式#

  • 所有发送到 Direct Exchange 的消息被转发到 RouteKey 中指定的 Queue 。
  • Direct 模式可以使用 RabbitMQ 自带的 Exchange: default Exchange，所以不需要将 Exchange 进行任何绑定(binding)操作 。
  • 消息传递时，RouteKey 必须完全匹配才会被队列接收，否则该消息会被抛弃，

RabbitMQ——最常用的三大模式

文章插图
 
Copyimport com.rabbitmq.client.Channel;import com.rabbitmq.client.Connection;import com.rabbitmq.client.ConnectionFactory;public class DirectProducer {public static void main(String[] args) throws Exception {//1. 创建一个 ConnectionFactory 并进行设置ConnectionFactory factory = new ConnectionFactory();factory.setHost("localhost");factory.setVirtualHost("/");factory.setUsername("guest");factory.setPassword("guest");//2. 通过连接工厂来创建连接Connection connection = factory.newConnection();//3. 通过 Connection 来创建 ChannelChannel channel = connection.createChannel();//4. 声明String exchangeName = "test_direct_exchange";String routingKey = "item.direct";//5. 发送String msg = "this is direct msg";channel.basicPublish(exchangeName, routingKey, null, msg.getBytes());System.out.println("Send message : " + msg);//6. 关闭连接channel.close();connection.close();}}Copyimport com.rabbitmq.client.*;import JAVA.io.IOException;public class DirectConsumer {public static void main(String[] args) throws Exception {//1. 创建一个 ConnectionFactory 并进行设置ConnectionFactory factory = new ConnectionFactory();factory.setHost("localhost");factory.setVirtualHost("/");factory.setUsername("guest");factory.setPassword("guest");factory.setAutomaticRecoveryEnabled(true);factory.setNetworkRecoveryInterval(3000);//2. 通过连接工厂来创建连接Connection connection = factory.newConnection();//3. 通过 Connection 来创建 ChannelChannel channel = connection.createChannel();//4. 声明String exchangeName = "test_direct_exchange";String queueName = "test_direct_queue";String routingKey = "item.direct";channel.exchangeDeclare(exchangeName, "direct", true, false, null);channel.queueDeclare(queueName, false, false, false, null);//一般不用代码绑定，在管理界面手动绑定channel.queueBind(queueName, exchangeName, routingKey);//5. 创建消费者并接收消息Consumer consumer = new DefaultConsumer(channel) {@Overridepublic void handleDelivery(String consumerTag, Envelope envelope,AMQP.BasicProperties properties, byte[] body)throws IOException {String message = new String(body, "UTF-8");System.out.println(" [x] Received '" + message + "'");}};//6. 设置 Channel 消费者绑定队列channel.basicConsume(queueName, true, consumer);}}Copy Send message : this is direct msg[x] Received 'this is direct msg'Topic 模式#可以使用通配符进行模糊匹配
  • 符号'#" 匹配一个或多个词
  • 符号"*”匹配不多不少一个词
例如:
  • 'log.#"能够匹配到'log.info.oa"
  • "log.*"只会匹配到"log.erro“

RabbitMQ——最常用的三大模式

文章插图
 
Copyimport com.rabbitmq.client.Channel;import com.rabbitmq.client.Connection;import com.rabbitmq.client.ConnectionFactory;public class TopicProducer {public static void main(String[] args) throws Exception {//1. 创建一个 ConnectionFactory 并进行设置ConnectionFactory factory = new ConnectionFactory();factory.setHost("localhost");factory.setVirtualHost("/");factory.setUsername("guest");factory.setPassword("guest");//2. 通过连接工厂来创建连接Connection connection = factory.newConnection();//3. 通过 Connection 来创建 ChannelChannel channel = connection.createChannel();//4. 声明String exchangeName = "test_topic_exchange";String routingKey1 = "item.update";String routingKey2 = "item.delete";String routingKey3 = "user.add";//5. 发送String msg = "this is topic msg";channel.basicPublish(exchangeName, routingKey1, null, msg.getBytes());channel.basicPublish(exchangeName, routingKey2, null, msg.getBytes());channel.basicPublish(exchangeName, routingKey3, null, msg.getBytes());System.out.println("Send message : " + msg);//6. 关闭连接channel.close();connection.close();}}【RabbitMQ——最常用的三大模式】Copyimport com.rabbitmq.client.*;import java.io.IOException;public class TopicConsumer {public static void main(String[] args) throws Exception {//1. 创建一个 ConnectionFactory 并进行设置ConnectionFactory factory = new ConnectionFactory();factory.setHost("localhost");factory.setVirtualHost("/");factory.setUsername("guest");factory.setPassword("guest");factory.setAutomaticRecoveryEnabled(true);factory.setNetworkRecoveryInterval(3000);//2. 通过连接工厂来创建连接Connection connection = factory.newConnection();//3. 通过 Connection 来创建 ChannelChannel channel = connection.createChannel();//4. 声明String exchangeName = "test_topic_exchange";String queueName = "test_topic_queue";String routingKey = "item.#";channel.exchangeDeclare(exchangeName, "topic", true, false, null);channel.queueDeclare(queueName, false, false, false, null);//一般不用代码绑定，在管理界面手动绑定channel.queueBind(queueName, exchangeName, routingKey);//5. 创建消费者并接收消息Consumer consumer = new DefaultConsumer(channel) {@Overridepublic void handleDelivery(String consumerTag, Envelope envelope,AMQP.BasicProperties properties, byte[] body)throws IOException {String message = new String(body, "UTF-8");System.out.println(" [x] Received '" + message + "'");}};//6. 设置 Channel 消费者绑定队列channel.basicConsume(queueName, true, consumer);}}


推荐阅读


上一篇：窗户没开窗台上全是苍蝇 窗户外面很多苍蝇怎么办

下一篇：蛇的特点是什么 毒蛇与无毒蛇的区别及防治原则