• 订阅模式

一个生成者，多个消费者，每个消费者有自己的队列，生产者没有直接把消息发到队列，而是发给了交换机exchange

适合场景举例：对于同一个消息，要发邮件，也要发短信，因此拆分成两个队列

 

• 新建连接RabbitMQ的工具类utils

import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
 
import java.io.IOException;
import java.util.concurrent.TimeoutException;
 
public class utils {
    public  static Connection getConnection() throws IOException, TimeoutException {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("localhost");
        factory.setPort(5672);
        factory.setVirtualHost("/vhost_zdy");
        factory.setUsername("username");
        factory.setPassword("password");
 
        return factory.newConnection();
    }
}

• 生产者类PubSubSend

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
 
import java.io.IOException;
import java.util.concurrent.TimeoutException;
 
public class PubSubSend {
    private final static String EXCHANGE_NAME = "PubSub_exchange";
    public static void main(String[] args) throws IOException, TimeoutException, InterruptedException {
        Connection connection = utils.getConnection();
        Channel channel = connection.createChannel();
        //声明交换机
        channel.exchangeDeclare(EXCHANGE_NAME,"fanout");
 
        for(int i=0;i<50;i++)//发50条消息
        {
            String msg="msg"+i;
            channel.basicPublish(EXCHANGE_NAME, "", null, msg.getBytes());
            Thread.sleep(20);//假设每20ms发送一次消息
            System.out.println("send:"+ msg);
        }
 
        channel.close();
        connection.close();
 
    }
}

运行后在控制台exchange查看是否生成交换机

• 消费者PubSubReceive_1和PubSubReceive_2 

import com.rabbitmq.client.*;
 
import java.io.IOException;
import java.util.concurrent.TimeoutException;
 
public class PubSubReceive_1 {
    private final static String QUEUE_NAME = "PubSub_queue_mail";
    private final static String EXCHANGE_NAME = "PubSub_exchange";
    public static void main(String[] args) throws IOException, TimeoutException {
        Connection connection = utils.getConnection();
        final Channel channel = connection.createChannel();
        channel.queueDeclare(QUEUE_NAME, false, false, false, null);
        channel.queueBind(QUEUE_NAME,EXCHANGE_NAME,"");
        channel.basicQos(1);//保证一次只分发一个\n" +
        System.out.println(" [1] Waiting for messages.");
 
        DefaultConsumer defaultConsumer= new DefaultConsumer(channel){
            @Override
            public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
                super.handleDelivery(consumerTag, envelope, properties, body);
                String msg = new String(body,"UTF-8");
                System.out.println("[1]receive:"+ msg);
                try {
                    Thread.sleep(2000);//假设消费者1处理时间为2s
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }finally {
                    System.out.println("[1]done:"+ msg);
                    //手动回执
                    channel.basicAck(envelope.getDeliveryTag(),false);
                }
            }
        };
        boolean autoack=false;
        channel.basicConsume(QUEUE_NAME,autoack,defaultConsumer);
    }
}
import com.rabbitmq.client.*;
 
import java.io.IOException;
import java.util.concurrent.TimeoutException;
 
public class PubSubReceive_2 {
    private final static String QUEUE_NAME = "PubSub_queue_tel";
    private final static String EXCHANGE_NAME = "PubSub_exchange";
    public static void main(String[] args) throws IOException, TimeoutException {
        Connection connection = utils.getConnection();
        final Channel channel = connection.createChannel();
        channel.queueDeclare(QUEUE_NAME, false, false, false, null);
        channel.queueBind(QUEUE_NAME,EXCHANGE_NAME,"");
        channel.basicQos(1);//保证一次只分发一个\n" +
        System.out.println(" [2] Waiting for messages.");
 
        DefaultConsumer defaultConsumer= new DefaultConsumer(channel){
            @Override
            public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
                super.handleDelivery(consumerTag, envelope, properties, body);
                String msg = new String(body,"UTF-8");
                System.out.println("[2]receive:"+ msg);
                try {
                    Thread.sleep(1000);//假设消费者1处理时间为2s
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }finally {
                    System.out.println("[2]done:"+ msg);
                    //手动回执
                    channel.basicAck(envelope.getDeliveryTag(),false);
                }
            }
        };
        boolean autoack=false;
        channel.basicConsume(QUEUE_NAME,autoack,defaultConsumer);
    }
}