RabbitMQ学习笔记3-Publish/Subscribe
来源:互联网 发布:淘宝订单管理系统 编辑:程序博客网 时间:2024/05/17 10:40
在这部分中,我们会做一些完全不同的事情 - 我们会向多个消费者传递相同的信息。这种模式就是“发布/订阅”。该模型中生产者从不将任何消息直接发送到队列,生产者通常甚至不知道要将消息发送到哪个队列,通常是,生产者把消息发送到了 交换机(exchange) 中,然后交换机负责将消息发送到某一个或者多个消息队列中。如图:
交换机还有4种不同的类型,分别是 direct , fanout , topic , headers ,每种类型路由的策略不同。本章节重点在fanout类型。
在第一章节“Hello World”中,
- channel.basicPublish("", QUEUE_NAME, null, message.getBytes());
参数一即是交换机的名称,空字符串指的就是默认交换机,参数二指的就是交换机路由到QUEUE_NAME的队列中。
生产者代码:
import com.rabbitmq.client.BuiltinExchangeType;import com.rabbitmq.client.Channel;import com.rabbitmq.client.Connection;import com.rabbitmq.client.ConnectionFactory;/** * @author yangkun * @date 2017年4月27日 下午4:03:08 * @description */public class EmitLog {private static final String EXCHANGE_NAME = "logs";public static void main(String[] args) throws Exception {ConnectionFactory factory = new ConnectionFactory();factory.setHost("127.0.0.1");Connection conn = factory.newConnection();Channel channel = conn.createChannel();channel.exchangeDeclare(EXCHANGE_NAME, BuiltinExchangeType.FANOUT);String message = "Hello World......";channel.basicPublish(EXCHANGE_NAME, "", null, message.getBytes());System.out.println(" [x] Sent '" + message + "'"); channel.close();conn.close();}}
在这里创建了一个fanout类型的名为logs的交换机
channel.exchangeDeclare(EXCHANGE_NAME, BuiltinExchangeType.FANOUT);
再将消息发送到该交换机上channel.basicPublish(EXCHANGE_NAME, "", null, message.getBytes());
运行结果:
import java.io.IOException;import com.rabbitmq.client.AMQP;import com.rabbitmq.client.BuiltinExchangeType;import com.rabbitmq.client.Channel;import com.rabbitmq.client.Connection;import com.rabbitmq.client.ConnectionFactory;import com.rabbitmq.client.Consumer;import com.rabbitmq.client.DefaultConsumer;import com.rabbitmq.client.Envelope;/** * @author yangkun * @date 2017年4月27日 下午5:13:35 * @description */public class ReceiveLogs {private static final String EXCHANGE_NAME = "logs";public static void main(String[] args) throws Exception {ConnectionFactory factory = new ConnectionFactory();factory.setHost("127.0.0.1");Connection connection = factory.newConnection();final Channel channel = connection.createChannel();channel.exchangeDeclare(EXCHANGE_NAME, BuiltinExchangeType.FANOUT);// 随机生成一个队列名String queueName = channel.queueDeclare().getQueue();System.out.println(queueName);// 队列与交换机的绑定channel.queueBind(queueName, EXCHANGE_NAME, "");System.out.println(" [*] Waiting for messages. To exit press CTRL+C");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 + "'");channel.basicAck(envelope.getDeliveryTag(), false);}};channel.basicConsume(queueName, false, consumer);}}
为防止队列名重名,我们可以通过以下方式保证队列名唯一
String queueName = channel.queueDeclare().getQueue();
然后需要将交换机与队列进行绑定
channel.queueBind(queueName, EXCHANGE_NAME, "");
消费者运行结果
channel.exchangeDeclare(EXCHANGE_NAME, BuiltinExchangeType.FANOUT);
0 0
- RabbitMQ学习笔记3;Publish/Subscribe
- RabbitMQ学习笔记3-Publish/Subscribe
- rabbitmq学习3:Publish/Subscribe
- rabbitmq学习3:Publish/Subscribe
- RabbitMQ 学习笔记(三):Publish/Subscribe
- RabbitMQ入门教程 For Java【3】 - Publish/Subscribe
- RabbitMQ入门教程 For Java【3】 - Publish/Subscribe
- RabbitMq之Publish/Subscribe
- RabbitMQ之Publish/Subscribe
- RabbitMQ Publish/Subscribe
- RabbitMQ学习(三).NET Client之Publish/Subscribe
- RabbitMQ学习小结(三)—— Publish Subscribe[Python]
- rabbitmq 教程 三 Publish/Subscribe
- RabbitMQ 入门四(Publish/Subscribe)
- RabbitMQ Publish/Subscribe 发布/订阅
- RabbitMQ案例之Publish/Subscribe
- RabbitMQ之三 Publish/Subscribe
- Rabbitmq教程翻译(三)Publish/Subscribe
- 1010 只包含因子2 3 5的数(丑数 二分)
- Java之——发邮件-QQ服务器认证(A secure connection is requiered(such as ssl))
- Elasticsearch重要配置
- C++小知识之指针和引用的区别
- "ORA-00942: 表或视图不存在 "的原因和解决方法,powerdesigner设计导入
- RabbitMQ学习笔记3-Publish/Subscribe
- python基础3 集合 三元运算 深浅拷贝 函数
- OpenGL 绘制API统计
- Android 获取本地音乐URI总结
- 50 个 Bootstrap 插件(收藏备用)
- Windows环境下首次安装与使用MYSQL数据库
- ZOJ 1438
- 台湾大学林轩田机器学习基石课程学习笔记9 -- Linear Regression
- Leetcode -- 38. Count and Say