RabbitMQ学习笔记（三）RabbitMQ不同的交换机进行路由

灰太狼 2021-01-24 18:59 577阅读 0赞

项目地址：[https://github.com/gongxianshengjiadexiaohuihui/RabbitMQ/tree/master/Exchange\_RabbitMQ][https_github.com_gongxianshengjiadexiaohuihui_RabbitMQ_tree_master_Exchange_RabbitMQ]

项目结构：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNTQzNjM0_size_16_color_FFFFFF_t_70][]

流程图

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNTQzNjM0_size_16_color_FFFFFF_t_70 1][]

补充知识：

Connection是RabbitMQ的sockert链接，封装了socket协议相关部分逻辑

ConnectionFactory是制造Connection的工厂

Connection是建立一个TCP连接，需要经过三次握手，如果每次生产和消费消息都要建立TCP连接十分耗费资源，因此我们用

Chanel建立虚拟连接，这个虚拟连接是建立在上面TCP连接的基础上，数据传输都通过Channel，不需要频繁的建立关闭tcp连接，而且tcp的连接数是有限制的

交换机一共有4种规则，第四种并不常用，因此我们只叙述前三种

fanout:类似与订阅发布，交换机把生产者的所有信息都发送到与它绑定的队列中

direct:交换机只发送信息到符合条件 rountingkey = bindingkey的队列中

topic：交换机发送信息到rountingkey符合匹配规则bindingkey的队列中，bindingkey类似于正则表达式

生产者代码

package main.java.com.ggp;
    
    
    import com.rabbitmq.client.Channel;
    import com.rabbitmq.client.Connection;
    import com.rabbitmq.client.ConnectionFactory;
    
    import java.io.IOException;
    import java.util.concurrent.TimeoutException;
    
    /**
     * @ClassName Producer
     * @Description TODO
     * @Author Mr.G
     * @Date 2018/11/21 9:16
     * @Version 1.0
     */
    public class Producer {
    
         public Producer(String exchangeName, String exchangeType)throws IOException, TimeoutException {
    
    
             ConnectionFactory connectionFactory = new ConnectionFactory();
             connectionFactory.setHost("localhost");
             connectionFactory.setUsername("guest");
             connectionFactory.setPassword("guest");
             Connection connection = connectionFactory.newConnection();
             Channel channel = connection.createChannel();
    
             channel.exchangeDeclare(exchangeName, exchangeType);
             /**
              * 分发消息,根据不同的交换机规则分发
              *
              */
             if("fanout".equals(exchangeType)) {
                 for (int i = 0; i < 5; i++) {
                     String message = "Hello Rabbit " + i;
                     channel.basicPublish(exchangeName, "", null, message.getBytes());
                     System.out.println("Producer Send  Message: " + message);
                 }
                 channel.close();
                 connection.close();
                 return;
             }
             if("direct".equals(exchangeType)){
                 String[] routingKeys = new String[]{"info", "warning", "error"};
                 for(String routingKey:routingKeys){
                     String message = "RoutingSendDirect Send the message level:"+routingKey;
                     channel.basicPublish(exchangeName,routingKey,null,message.getBytes());
                     System.out.println("RoutingSendDirect Send " + routingKey + ": "+message);
                 }
                 channel.close();;
                 connection.close();
                 return;
             }
             if("topic".equals(exchangeType)){
                 String[] routingKeys = new String[]{"a.b.c", "a.a.b.d","ad.dd.b.c"};
                 for(String routingKey:routingKeys){
                     String message = "Topic Send the message which the routingkey is "+routingKey;
                     channel.basicPublish(exchangeName,routingKey,null,message.getBytes());
                     System.out.println("send message: " + message + " successfully!");
                 }
                 channel.close();
                 connection.close();
                 return;
             }
             channel.close();
             connection.close();
             throw new RuntimeException("Unsupported the exchangeType!");
         }
    
    
    }

消费者代码

package main.java.com.ggp;
    
    import com.rabbitmq.client.*;
    
    import java.io.IOException;
    import java.util.concurrent.TimeoutException;
    
    /**
     * @ClassName Customer
     * @Description TODO
     * @Author Mr.G
     * @Date 2018/11/21 10:12
     * @Version 1.0
     */
    public class Customer {
    
    
    
        public Customer(String customerName,String exchangeName, String exchangeType)throws IOException,TimeoutException {
            final String customer_name = customerName;
            final String exchange_type = exchangeType;
            ConnectionFactory connectionFactory = new ConnectionFactory();
            connectionFactory.setHost("localhost");
            connectionFactory.setUsername("guest");
            connectionFactory.setPassword("guest");
            Connection connection = connectionFactory.newConnection();
            Channel channel = connection.createChannel();
            channel.exchangeDeclare(exchangeName,exchangeType);
            /**
             * 创建随机队列，根据不同的交换机规则绑定队列
             */
            String queueName = channel.queueDeclare().getQueue();
            if("fanout".equals(exchangeType)){
                channel.queueBind(queueName,exchangeName,"");
                System.out.println(customerName+" is waiting message that the type of it is fanout");
            }else if("direct".equals(exchangeType)){
                String[] bindingKeys = new String[]{"info","warning"};
                for(String bindingKey:bindingKeys){
                    channel.queueBind(queueName,exchangeName,bindingKey);
                }
                System.out.println(customerName+" is waiting message that the type of it is direct");
            }else if("topic".equals(exchangeType)){
                String bindingKey = "#.b.*";
                channel.queueBind(queueName,exchangeName,bindingKey);
                System.out.println(customerName+" is waiting message that the type of it is topic");
            }else {
                throw new RuntimeException("Unsupported the exchangeType!");
            }
            Consumer consumer = new DefaultConsumer(channel){
                @Override
                public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body)throws IOException{
                    String message = new String(body,"UTF-8");
                    System.out.println(customer_name+" has dealt the "+exchange_type+" message: "+ message);
                }
            };
            channel.basicConsume(queueName,true,consumer);
    
        }
    }

测试代码

package test.java.com.ggp.test;
    
    import main.java.com.ggp.Customer;
    import main.java.com.ggp.Producer;
    
    /**
     * @ClassName FanoutTest
     * @Description TODO
     * @Author Mr.G
     * @Date 2018/11/21 10:47
     * @Version 1.0
     */
    public class FanoutTest {
        public static void main(String[] args) throws Exception{
            new Customer("ggp","fanout","fanout");
            new Customer("rqb","fanout","fanout");
            new Producer("fanout","fanout");
        }
    }

测试结果

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNTQzNjM0_size_16_color_FFFFFF_t_70 2][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNTQzNjM0_size_16_color_FFFFFF_t_70 3][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNTQzNjM0_size_16_color_FFFFFF_t_70 4][]

[https_github.com_gongxianshengjiadexiaohuihui_RabbitMQ_tree_master_Exchange_RabbitMQ]: https://github.com/gongxianshengjiadexiaohuihui/RabbitMQ/tree/master/Exchange_RabbitMQ
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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNTQzNjM0_size_16_color_FFFFFF_t_70 1]: /images/1611514707748.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNTQzNjM0_size_16_color_FFFFFF_t_70 2]: /images/1611514697188.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNTQzNjM0_size_16_color_FFFFFF_t_70 3]: /images/1611514686896.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNTQzNjM0_size_16_color_FFFFFF_t_70 4]: /images/1611514674985.png