（三）RabbitMQ七种模式介绍与代码演示

Lison <[e-mail]>, v1.0.0, 2023.06.22

七种模式介绍与代码演示

四大交换机

交换机概念

• 交换机可以理解成具有路由表的路由程序，仅此而已。每个消息都有一个称为路由键（routing key）的属性，就是一个简单的字符串。
• 最新版本的RabbitMQ有四种交换机类型，分别是Direct exchange、Fanout exchange、Topic exchange、Headers exchange。
• 交换机的作用： 生产者向broker（rabbitmq服务器）发送消息，交换机通过生产者绑定的路由键，将消息推送到不同的消息队列中。而消费者，只绑定队列，从队列中获取消息。
• 以上三种类型的发送精准顺序为：点对点类型 > 通配符类型 > 广播类型

四种交换机介绍

• 直连交换机（Direct exchange）： 具有路由功能的交换机，绑定到此交换机的时候需要指定一个routing_key，交换机发送消息的时候需要routing_key，会将消息发送道对应的队列
• 扇形交换机（Fanout exchange）： 广播消息到所有队列，没有任何处理，速度最快
• 主题交换机（Topic exchange）： 在直连交换机基础上增加模式匹配，也就是对routing_key进行模式匹配，*代表一个单词，#代表多个单词
• 首部交换机（Headers exchange）： 忽略routing_key，使用Headers信息（一个Hash的数据结构）进行匹配，优势在于可以有更多更灵活的匹配规则

交换机参数

1. name: 交换机名称
2. type: 交换机类型 direct，topic，fanout，headers
3. durability: 是否需要持久化，true 为持久化
4. auto delete: 当最后一个绑定到 Exchange 上的队列被删除后，Exchange 就没有绑定的队列了，自动删除该 Exchange
5. internal: 当前 Exchange 是否为内部交换机，默认为 false，客户端无法直接发送消息到这个交换机中，只能通过交换机路由到交换机这种方式
6. arguments: 扩展参数，用于扩展 AMQP 协议自制定化使用

工作模式

简单模式（Hello World）

做最简单的事情，一个生产者对应一个消费者，RabbitMQ相当于一个消息代理，负责将A的消息转发给B

应用场景： 将发送的电子邮件放到消息队列，然后邮件服务在队列中获取邮件并发送给收件人

工作队列模式（Work queues）

在多个消费者之间分配任务（竞争的消费者模式），一个生产者对应多个消费者，一般适用于执行资源密集型任务，单个消费者处理不过来，需要多个消费者进行处理

应用场景： 一个订单的处理需要10s，有多个订单可以同时放到消息队列，然后让多个消费者同时处理，这样就是并行了，而不是单个消费者的串行情况

订阅模式（Publish/Subscribe）

一次向许多消费者发送消息，一个生产者发送的消息会被多个消费者获取，也就是将消息将广播到所有的消费者中。

应用场景： 更新商品库存后需要通知多个缓存和多个数据库，这里的结构应该是：

• 一个fanout类型交换机扇出两个个消息队列，分别为缓存消息队列、数据库消息队列
• 一个缓存消息队列对应着多个缓存消费者
• 一个数据库消息队列对应着多个数据库消费者

路由模式（Routing）

有选择地（Routing key）接收消息，发送消息到交换机并且要指定路由key ，消费者将队列绑定到交换机时需要指定路由key，仅消费指定路由key的消息

应用场景： 如在商品库存中增加了1台iphone12，iphone12促销活动消费者指定routing key为iphone12，只有此促销活动会接收到消息，其它促销活动不关心也不会消费此routing key的消息

主题模式（Topics）

根据主题（Topics）来接收消息，将路由key和某模式进行匹配，此时队列需要绑定在一个模式上，#匹配一个词或多个词，*只匹配一个词。

应用场景： 同上，iphone促销活动可以接收主题为iphone的消息，如iphone12、iphone13等

远程过程调用（RPC）

如果我们需要在远程计算机上运行功能并等待结果就可以使用RPC，具体流程可以看图。应用场景：需要等待接口返回数据，如订单支付

发布者确认（Publisher Confirms）

与发布者进行可靠的发布确认，发布者确认是RabbitMQ扩展，可以实现可靠的发布。在通道上启用发布者确认后，RabbitMQ将异步确认发送者发布的消息，这意味着它们已在服务器端处理。

应用场景： 对于消息可靠性要求较高，比如钱包扣款

代码演示

代码中没有对后面两种模式演示，有兴趣可以自己研究

简单模式

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;import java.io.IOException;
import java.util.concurrent.TimeoutException;public class SimpleQueueSender {private final static String QUEUE_NAME = "simple_queue";public static void main(String[] args) throws IOException, TimeoutException {ConnectionFactory factory = new ConnectionFactory();factory.setHost("127.0.0.1");factory.setPort(5672);factory.setUsername("admin");factory.setPassword("123456");Connection connection = factory.newConnection();Channel channel = connection.createChannel();// 声明队列// queue：队列名// durable：是否持久化// exclusive：是否排外  即只允许该channel访问该队列   一般等于true的话用于一个队列只能有一个消费者来消费的场景// autoDelete：是否自动删除  消费完删除// arguments：其他属性channel.queueDeclare(QUEUE_NAME, false, false, false, null);//消息内容String message = "simplest mode message";channel.basicPublish("", QUEUE_NAME, null, message.getBytes());System.out.println("[x]Sent '" + message + "'");//最后关闭通关和连接channel.close();connection.close();}
}

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.DeliverCallback;import java.io.IOException;
import java.util.concurrent.TimeoutException;public class SimpleQueueReceiver {private final static String QUEUE_NAME = "simple_queue";public static void main(String[] args) throws IOException, InterruptedException, TimeoutException {// 获取连接ConnectionFactory factory = new ConnectionFactory();factory.setHost("localhost");factory.setPort(5672);factory.setUsername("admin");factory.setPassword("123456");Connection connection = factory.newConnection();Channel channel = connection.createChannel();channel.queueDeclare(QUEUE_NAME, false, false, false, null);DeliverCallback deliverCallback = (consumerTag, delivery) -> {String message = new String(delivery.getBody(), "UTF-8");System.out.println(" [x] Received  '" +delivery.getEnvelope().getRoutingKey() + "':'" + message + "'");};channel.basicConsume(QUEUE_NAME, true, deliverCallback, consumerTag -> {});System.out.println("----");}
}

工作队列模式

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.DeliverCallback;import java.io.IOException;
import java.util.concurrent.TimeoutException;public class QueueWorkReceiver1 {private final static String QUEUE_NAME = "queue_work";public static void main(String[] args) throws IOException, InterruptedException, TimeoutException {// 获取连接ConnectionFactory factory = new ConnectionFactory();factory.setHost("localhost");factory.setPort(5672);factory.setUsername("admin");factory.setPassword("123456");Connection connection = factory.newConnection();Channel channel = connection.createChannel();channel.queueDeclare(QUEUE_NAME, false, false, false, null);// 同一时刻服务器只会发送一条消息给消费者channel.basicQos(1);DeliverCallback deliverCallback = (consumerTag, delivery) -> {String message = new String(delivery.getBody(), "UTF-8");System.out.println(" [x] Received '" +delivery.getEnvelope().getRoutingKey() + "':'" + message + "'");};channel.basicConsume(QUEUE_NAME, true, deliverCallback, consumerTag -> {});}
}

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.DeliverCallback;import java.io.IOException;
import java.util.concurrent.TimeoutException;public class QueueWorkReceiver2 {private final static String QUEUE_NAME = "queue_work";public static void main(String[] args) throws IOException, InterruptedException, TimeoutException {// 获取连接ConnectionFactory factory = new ConnectionFactory();factory.setHost("localhost");factory.setPort(5672);factory.setUsername("admin");factory.setPassword("123456");Connection connection = factory.newConnection();Channel channel = connection.createChannel();channel.queueDeclare(QUEUE_NAME, false, false, false, null);// 同一时刻服务器只会发送一条消息给消费者channel.basicQos(1);DeliverCallback deliverCallback = (consumerTag, delivery) -> {String message = new String(delivery.getBody(), "UTF-8");System.out.println(" [x] Received '" +delivery.getEnvelope().getRoutingKey() + "':'" + message + "'");};channel.basicConsume(QUEUE_NAME, true, deliverCallback, consumerTag -> {});}
}

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;import java.io.IOException;
import java.util.concurrent.TimeoutException;public class QueueWorkSender {private final static String QUEUE_NAME = "queue_work";public static void main(String[] args) throws IOException, InterruptedException, TimeoutException {ConnectionFactory factory = new ConnectionFactory();factory.setHost("localhost");factory.setPort(5672);factory.setUsername("admin");factory.setPassword("123456");Connection connection = factory.newConnection();Channel channel = connection.createChannel();// 声明队列channel.queueDeclare(QUEUE_NAME, false, false, false, null);for (int i = 0; i < 100; i++) {String message = "work mode message" + i;channel.basicPublish("", QUEUE_NAME, null, message.getBytes());System.out.println("[x] Sent '" + message + "'");Thread.sleep(i * 10);}channel.close();connection.close();}
}

发布订阅模式

package com.lison.upgrade.middleware.rabbitmq;import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.DeliverCallback;public class PublishSubscribeReceive1 {private static final String EXCHANGE_NAME = "logs";public static void main(String[] argv) throws Exception {ConnectionFactory factory = new ConnectionFactory();factory.setHost("localhost");factory.setPort(5672);factory.setUsername("admin");factory.setPassword("123456");Connection connection = factory.newConnection();Channel channel = connection.createChannel();channel.exchangeDeclare(EXCHANGE_NAME, "fanout");String queueName = channel.queueDeclare().getQueue();channel.queueBind(queueName, EXCHANGE_NAME, "");System.out.println(" [*] Waiting for messages. To exit press CTRL+C");// 订阅消息的回调函数DeliverCallback deliverCallback = (consumerTag, delivery) -> {String message = new String(delivery.getBody(), "UTF-8");System.out.println(" [x] Received '" + message + "'");};// 消费者，有消息时出发订阅回调函数channel.basicConsume(queueName, true, deliverCallback, consumerTag -> {});}
}

package com.lison.upgrade.middleware.rabbitmq;import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.DeliverCallback;public class PublishSubscribeReceive2 {private static final String EXCHANGE_NAME = "logs";public static void main(String[] argv) throws Exception {ConnectionFactory factory = new ConnectionFactory();factory.setHost("localhost");factory.setPort(5672);factory.setUsername("admin");factory.setPassword("123456");Connection connection = factory.newConnection();Channel channel = connection.createChannel();channel.exchangeDeclare(EXCHANGE_NAME, "fanout");String queueName = channel.queueDeclare().getQueue();channel.queueBind(queueName, EXCHANGE_NAME, "");System.out.println(" [*] Waiting for messages. To exit press CTRL+C");// 订阅消息的回调函数DeliverCallback deliverCallback = (consumerTag, delivery) -> {String message = new String(delivery.getBody(), "UTF-8");System.out.println(" [x] Received2 '" + message + "'");};// 消费者，有消息时出发订阅回调函数channel.basicConsume(queueName, true, deliverCallback, consumerTag -> {});}
}

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;public class PublishSubscribeSender {private static final String EXCHANGE_NAME = "logs";public static void main(String[] argv) throws Exception {ConnectionFactory factory = new ConnectionFactory();factory.setHost("localhost");factory.setPort(5672);factory.setUsername("admin");factory.setPassword("123456");Connection connection = factory.newConnection();Channel channel = connection.createChannel();channel.exchangeDeclare(EXCHANGE_NAME, "fanout");String message = "publish subscribe message";channel.basicPublish(EXCHANGE_NAME, "", null, message.getBytes("UTF-8"));System.out.println(" [x] Sent '" + message + "'");channel.close();connection.close();}
}

路由模式

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.DeliverCallback;import java.io.IOException;
import java.util.concurrent.TimeoutException;public class QueueRoutingReceiver1 {private final static String QUEUE_NAME = "queue_routing";private final static String EXCHANGE_NAME = "exchange_direct";public static void main(String[] args) throws IOException, TimeoutException {ConnectionFactory factory = new ConnectionFactory();factory.setHost("localhost");factory.setPort(5672);factory.setUsername("admin");factory.setPassword("123456");Connection connection = factory.newConnection();Channel channel = connection.createChannel();channel.queueDeclare(QUEUE_NAME, false, false, false, null);// 指定路由的key，接收key和key2channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, "key");channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, "key2");channel.basicQos(1);DeliverCallback deliverCallback = (consumerTag, delivery) -> {String message = new String(delivery.getBody(), "UTF-8");System.out.println(" [x] Received '" +delivery.getEnvelope().getRoutingKey() + "':'" + message + "'");};channel.basicConsume(QUEUE_NAME, true, deliverCallback, consumerTag -> {});}}

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.DeliverCallback;import java.io.IOException;
import java.util.concurrent.TimeoutException;public class QueueRoutingReceiver2 {private final static String QUEUE_NAME = "queue_routing2";private final static String EXCHANGE_NAME = "exchange_direct";public static void main(String[] args) throws IOException, TimeoutException {ConnectionFactory factory = new ConnectionFactory();factory.setHost("localhost");factory.setPort(5672);factory.setUsername("admin");factory.setPassword("123456");Connection connection = factory.newConnection();Channel channel = connection.createChannel();channel.queueDeclare(QUEUE_NAME, false, false, false, null);// 仅接收key2channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, "key2");channel.basicQos(1);DeliverCallback deliverCallback = (consumerTag, delivery) -> {String message = new String(delivery.getBody(), "UTF-8");System.out.println(" [x] Received '" +delivery.getEnvelope().getRoutingKey() + "':'" + message + "'");};channel.basicConsume(QUEUE_NAME, true, deliverCallback, consumerTag -> {});}
}

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;import java.io.IOException;
import java.util.concurrent.TimeoutException;public class QueueRoutingSender {private final static String EXCHANGE_NAME = "exchange_direct";private final static String EXCHANGE_TYPE = "direct";public static void main(String[] args) throws IOException, TimeoutException {ConnectionFactory factory = new ConnectionFactory();factory.setHost("localhost");factory.setPort(5672);factory.setUsername("admin");factory.setPassword("123456");Connection connection = factory.newConnection();Channel channel = connection.createChannel();// 交换机声明channel.exchangeDeclare(EXCHANGE_NAME, EXCHANGE_TYPE);// 只有routingKey相同的才会消费String message = "routing mode message";channel.basicPublish(EXCHANGE_NAME, "key2", null, message.getBytes());System.out.println("[x] Sent '" + message + "'");
//        channel.basicPublish(EXCHANGE_NAME, "key", null, message.getBytes());
//        System.out.println("[x] Sent '" + message + "'");channel.close();connection.close();}
}

主题模式

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.DeliverCallback;import java.io.IOException;
import java.util.concurrent.TimeoutException;public class Receiver1 {private final static String QUEUE_NAME = "queue_topic";private final static String EXCHANGE_NAME = "exchange_topic";public static void main(String[] args) throws IOException, InterruptedException, TimeoutException {ConnectionFactory factory = new ConnectionFactory();factory.setHost("localhost");factory.setPort(5672);Connection connection = factory.newConnection();Channel channel = connection.createChannel();channel.queueDeclare(QUEUE_NAME, false, false, false, null);// 可以接收key.1channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, "key.*");channel.basicQos(1);DeliverCallback deliverCallback = (consumerTag, delivery) -> {String message = new String(delivery.getBody(), "UTF-8");System.out.println(" [x] Received '" +delivery.getEnvelope().getRoutingKey() + "':'" + message + "'");};channel.basicConsume(QUEUE_NAME, true, deliverCallback, consumerTag -> {});}
}

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.DeliverCallback;import java.io.IOException;
import java.util.concurrent.TimeoutException;public class Receiver2 {private final static String QUEUE_NAME = "queue_topic2";private final static String EXCHANGE_NAME = "exchange_topic";private final static String EXCHANGE_TYPE = "topic";public static void main(String[] args) throws IOException, InterruptedException, TimeoutException {ConnectionFactory factory = new ConnectionFactory();factory.setHost("localhost");factory.setPort(5672);Connection connection = factory.newConnection();Channel channel = connection.createChannel();channel.queueDeclare(QUEUE_NAME, false, false, false, null);// *号代表单个单词，可以接收key.1channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, "*.*");// #号代表多个单词，可以接收key.1.2channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, "*.#");channel.basicQos(1);DeliverCallback deliverCallback = (consumerTag, delivery) -> {String message = new String(delivery.getBody(), "UTF-8");System.out.println(" [x] Received '" +delivery.getEnvelope().getRoutingKey() + "':'" + message + "'");};channel.basicConsume(QUEUE_NAME, true, deliverCallback, consumerTag -> {});}
}

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;import java.io.IOException;
import java.util.concurrent.TimeoutException;public class Sender {private final static String EXCHANGE_NAME = "exchange_topic";private final static String EXCHANGE_TYPE = "topic";public static void main(String[] args) throws IOException, TimeoutException {ConnectionFactory factory = new ConnectionFactory();factory.setHost("localhost");factory.setPort(5672);Connection connection = factory.newConnection();Channel channel = connection.createChannel();channel.exchangeDeclare(EXCHANGE_NAME, EXCHANGE_TYPE);String message = "topics model message with key.1";channel.basicPublish(EXCHANGE_NAME, "key.1", null, message.getBytes());System.out.println("[x] Sent '" + message + "'");String message2 = "topics model message with key.1.2";channel.basicPublish(EXCHANGE_NAME, "key.1.2", null, message2.getBytes());System.out.println("[x] Sent '" + message2 + "'");channel.close();connection.close();}
}

SpringBoot整合RabbitMQ

引入依赖基础配置

1、创建SpringBoot项目，引入RabbitMQ起步依赖

<!-- RabbitMQ起步依赖 -->
<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-amqp</artifactId>
</dependency>

2、写配置文件

spring:rabbitmq:host: 127.0.0.1port: 5672username: adminpassword: 123456virtual-host: /
#日志格式
logging:pattern:console: '%d{HH:mm:ss.SSS} %clr(%-5level) --- [%-15thread] %cyan(%-50logger{50}):%msg%n'

SpringBoot整合RabbitMQ时，需要在配置类创建队列和交换机，写法如下：

@Configuration
public class RabbitConfig {private final String EXCHANGE_NAME = "boot_topic_exchange";private final String QUEUE_NAME = "boot_queue";// 创建交换机@Bean("bootExchange")public Exchange getExchange() {return ExchangeBuilder.topicExchange(EXCHANGE_NAME) // 交换机类型.durable(true) // 是否持久化.build();}// 创建队列@Bean("bootQueue")public Queue getMessageQueue() {return new Queue(QUEUE_NAME); // 队列名}// 交换机绑定队列@Beanpublic Binding bindMessageQueue(@Qualifier("bootExchange") Exchange exchange, @Qualifier("bootQueue") Queue queue) {return BindingBuilder.bind(queue).to(exchange).with("#.message.#").noargs();}
}

生产者

SpringBoot整合RabbitMQ时，提供了工具类RabbitTemplate发送消息，编写生产者时只需要注入RabbitTemplate即可发送消息。

@SpringBootTest
public class TestProducer {// 注入RabbitTemplate工具类@Autowiredprivate RabbitTemplate rabbitTemplate;@Testpublic void testSendMessage(){/*** 发送消息* 参数1：交换机* 参数2：路由key* 参数3：要发送的消息*/rabbitTemplate.convertAndSend("boot_topic_exchange","message","这个是生产者发送消息！");}
}

消费者

@Component
public class Consumer {// 监听队列@RabbitListener(queues = "boot_queue")public void listen_message(String message){System.out.println("发送短信："+message);}
}

启动项目，可以看到消费者会消费队列中的消息