09-RabbitMQ核心API-Fanout Exchange

Fanout Exchange

简介

• 不处理路由键, 只需要简单的将队列绑定到交换机上
• 发送到交换机的消息都会被转发到与该交换机绑定的所有队列上
• Fanout交换机转发消息是最快的

代码实现

消费者1

代码语言：javascript复制

package com.dance.redis.mq.rabbit.fanout;

import com.dance.redis.mq.rabbit.RabbitMQHelper;
import com.rabbitmq.client.*;
 
import java.io.IOException;
import java.util.concurrent.TimeUnit;
 
public class Receiver4FanoutExchange1 {
    public static void main(String[] args) throws Exception {
        Channel channel = RabbitMQHelper.getChannel();
        String exchangeName = "test_fanout_exchange";
        String exchangeType = "fanout";
        String queueName = "test_fanout_queue";
        String routingKey = "";    //    不设置路由键
        RabbitMQHelper.exchangeDeclare(channel,exchangeName,RabbitMQHelper.EXCHANGE_TYPE_FANOUT);
        RabbitMQHelper.queueDeclare(channel,queueName);
        channel.queueBind(queueName, exchangeName, routingKey);
        channel.basicQos(64);//设置客户端最多接收未被ack的消息个数
        Consumer consumer = new DefaultConsumer(channel) {
            @Override
            public void handleDelivery(String consumerTag,
                                       Envelope envelope,
                                       AMQP.BasicProperties properties,
                                       byte[] body)
                    throws IOException {
                System.err.println("--------------- consumer 1 --------------");
                System.out.println("recvive message:"   new String(body)   ", RoutingKey: "   envelope.getRoutingKey());
                try {
                    TimeUnit.SECONDS.sleep(1);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                channel.basicAck(envelope.getDeliveryTag(), false);
            }
        };
        //参数：队列名称、是否自动ACK、Consumer
        channel.basicConsume(queueName, false, consumer);
        //等待回调函数执行完毕之后，关闭资源。
        TimeUnit.SECONDS.sleep(50);
        channel.close();
        RabbitMQHelper.closeConnection();
    }
}

消费者2

代码语言：javascript复制

package com.dance.redis.mq.rabbit.fanout;

import com.dance.redis.mq.rabbit.RabbitMQHelper;
import com.rabbitmq.client.*;

import java.io.IOException;
import java.util.concurrent.TimeUnit;

public class Receiver4FanoutExchange2 {
    public static void main(String[] args) throws Exception {
        Channel channel = RabbitMQHelper.getChannel();
        //4 声明
        String exchangeName = "test_fanout_exchange";
        String queueName = "test_fanout_queue";
        String routingKey = "";    //    不设置路由键
        RabbitMQHelper.exchangeDeclare(channel,exchangeName,RabbitMQHelper.EXCHANGE_TYPE_FANOUT);
        RabbitMQHelper.queueDeclare(channel,queueName);
        channel.queueBind(queueName, exchangeName, routingKey);
        channel.basicQos(64);//设置客户端最多接收未被ack的消息个数
        Consumer consumer = new DefaultConsumer(channel) {
            @Override
            public void handleDelivery(String consumerTag,
                                       Envelope envelope,
                                       AMQP.BasicProperties properties,
                                       byte[] body)
                    throws IOException {
                System.err.println("--------------- consumer 2 --------------");
                System.out.println("recvive message:"   new String(body)   ", RoutingKey: "   envelope.getRoutingKey());
                try {
                    TimeUnit.SECONDS.sleep(1);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                channel.basicAck(envelope.getDeliveryTag(), false);
            }
        };
        //参数：队列名称、是否自动ACK、Consumer
        channel.basicConsume(queueName, false, consumer);
        //等待回调函数执行完毕之后，关闭资源。
        TimeUnit.SECONDS.sleep(50);
        channel.close();
        RabbitMQHelper.closeConnection();
    }
}

生产者

代码语言：javascript复制

package com.dance.redis.mq.rabbit.fanout;

import com.dance.redis.mq.rabbit.RabbitMQHelper;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
 
public class Sender4FanoutExchange {
 
    
    public static void main(String[] args) throws Exception {
        Channel channel = RabbitMQHelper.getChannel();
        String exchangeName = "test_fanout_exchange";
        for(int i = 0; i < 10; i   ) {
            String msg = "Hello World RabbitMQ 4 FANOUT Exchange Message ...";
            channel.basicPublish(exchangeName, "" , null , msg.getBytes());
        }
        channel.close();  
        RabbitMQHelper.closeConnection();
    }
    
}

测试

启动消费者1

启动消费者2

启动生产者

查看消费者1

查看消费者2

每人五条, 消费均摊

测试 队列 交换机

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