[Java知识库] Kafka，RabbitMQ，RockedMQ实际应用大汇总2.RabbitMQ，RocketMQ

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[Java知识库]Kafka，RabbitMQ，RockedMQ实际应用大汇总2.RabbitMQ，RocketMQ

Kafka，RabbitMQ，RockedMQ实际应用大汇总2.RocketMQ&RabbitMQ

本文结合官网用例，记载了三大主流mq的实例以及实际运用。
本文不涉及相关环境的安装与配置，涉及较为全面的代码（包括配置文件及maven）
本文直接上代码及用例，适合对mq已经学过一遍或了解过的同学进行学习&复习，可加入生产环境。
关于各种mq的介绍及对比可以参照我之前的文章
其实mq的设计思想都差不多，可以细细感受一下mq的设计理念以及基本的服务对象。
如果有问题，欢迎留言区或私信进行交流。
虽然已经挑重点代码拿出来了，但是一篇文章里写三个mq还是很长，因此还是分为三篇记录吧，这是第二篇，主讲RabbitMQ，RocketMQ。

二：RocketMQ

推荐阅读官方example，讲的非常非常详细了，按照同步异步订阅等等等类别都分好了，阅读example的体验感也很好。
官方example

三：RabbitMQ

官方example同样给的非常详细，但有些并不常用。但官网上的图绝对是学习与理解的利器。
官方example

路由模式(工作队列）
- （消费者）监听者

package net.xdclass.direct;

import com.rabbitmq.client.*;

import java.nio.charset.StandardCharsets;

public class Recv{

    private final static String EXCHANGE_NAME = "exchange_direct";

    public static void main(String[] argv) throws Exception {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("47.98.122.108");
        factory.setUsername("admin");
        factory.setPassword("123456");
        factory.setVirtualHost("/dev");
        factory.setPort(5672);

        //消费者一般不增加自动关闭
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();

        //绑定交换机
        channel.exchangeDeclare(EXCHANGE_NAME,BuiltinExchangeType.DIRECT);

        //获取队列（排它队列）
        String queueName = channel.queueDeclare().getQueue();

        //绑定队列和交换机,fanout交换机不用指定routingkey
        channel.queueBind(queueName,EXCHANGE_NAME,"errorRoutingKey");
        channel.queueBind(queueName,EXCHANGE_NAME,"infoRoutingKey");
        channel.queueBind(queueName,EXCHANGE_NAME,"debugRoutingKey");



        DeliverCallback deliverCallback = (consumerTag, delivery) -> {
            String message = new String(delivery.getBody(), StandardCharsets.UTF_8);
            System.out.println(" [x] Received '" + message + "'");
        };

        //自动确认消息
        channel.basicConsume(queueName, true, deliverCallback, consumerTag -> { });

    }
}

(生产者）消息的发送端

package net.xdclass.direct;

import com.rabbitmq.client.BuiltinExchangeType;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;

import java.nio.charset.StandardCharsets;

public class Send {

    private final static String EXCHANGE_NAME = "exchange_direct";

    public static void main(String[] argv) throws Exception {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("47.98.122.108");
        factory.setUsername("admin");
        factory.setPassword("123456");
        factory.setVirtualHost("/dev");
        factory.setPort(5672);

        /**
         * 消息生产者不用过多操作，只需要和交换机绑定即可
         */
        try (//创建连接
             Connection connection = factory.newConnection();
             //创建信道
             Channel channel = connection.createChannel()) {

            //绑定交换机
            channel.exchangeDeclare(EXCHANGE_NAME, BuiltinExchangeType.DIRECT);

            String error = "我是订单服务的error日志";
            String info = "我是订单服务的info日志";
            String debug = "我是订单服务的debug日志";

            channel.basicPublish(EXCHANGE_NAME, "errorRoutingKey", null, error.getBytes(StandardCharsets.UTF_8));
            channel.basicPublish(EXCHANGE_NAME, "infoRoutingKey", null, info.getBytes(StandardCharsets.UTF_8));
            channel.basicPublish(EXCHANGE_NAME, "debugRoutingKey", null, debug.getBytes(StandardCharsets.UTF_8));

            System.out.println("发送成功");

        }
    }
}

订阅发布模式
订阅者（消息消费者）

package net.xdclass.pub;

import com.rabbitmq.client.*;

import java.io.IOException;
import java.nio.charset.StandardCharsets;

public class Recv{

   private final static String EXCHANGE_NAME = "exchange_fanout";

   public static void main(String[] argv) throws Exception {
       ConnectionFactory factory = new ConnectionFactory();
       factory.setHost("47.98.122.108");
       factory.setUsername("admin");
       factory.setPassword("123456");
       factory.setVirtualHost("/dev");
       factory.setPort(5672);

       //消费者一般不增加自动关闭
       Connection connection = factory.newConnection();
       Channel channel = connection.createChannel();

       //绑定交换机,fanout扇形，即广播类型
       channel.exchangeDeclare(EXCHANGE_NAME,BuiltinExchangeType.FANOUT);

       //获取队列（排它队列）
       String queueName = channel.queueDeclare().getQueue();

       //绑定队列和交换机,fanout交换机不用指定routingkey
       channel.queueBind(queueName,EXCHANGE_NAME,"");


       DeliverCallback deliverCallback = (consumerTag, delivery) -> {
           String message = new String(delivery.getBody(), StandardCharsets.UTF_8);
           System.out.println(" [x] Received '" + message + "'");
       };

       //自动确认消息
       channel.basicConsume(queueName, true, deliverCallback, consumerTag -> { });

   }
}

发布者（消息生产者）

package net.xdclass.pub;

import com.rabbitmq.client.BuiltinExchangeType;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;

import java.nio.charset.StandardCharsets;

public class Send {

    private final static String EXCHANGE_NAME = "exchange_fanout";

    public static void main(String[] argv) throws Exception {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("47.98.122.108");
        factory.setUsername("admin");
        factory.setPassword("123456");
        factory.setVirtualHost("/dev");
        factory.setPort(5672);

        /**
         * 消息生产者不用过多操作，只需要和交换机绑定即可
         */
        try (//创建连接
             Connection connection = factory.newConnection();
             //创建信道
             Channel channel = connection.createChannel()) {

            //绑定交换机,fanout扇形，即广播类型
            channel.exchangeDeclare(EXCHANGE_NAME, BuiltinExchangeType.FANOUT);

            String message = "Hello World pub !";
            channel.basicPublish(EXCHANGE_NAME, "", null, message.getBytes(StandardCharsets.UTF_8));
            System.out.println(" [x] Sent '" + message + "'");

        }
    }
}

主题模式
消费者

package net.xdclass.topic;

import com.rabbitmq.client.*;

import java.io.IOException;
import java.nio.charset.StandardCharsets;

public class Recv2 {

    private final static String EXCHANGE_NAME = "exchange_topic";

    public static void main(String[] argv) throws Exception {

        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("47.98.122.108");
        factory.setUsername("admin");
        factory.setPassword("123456");
        factory.setVirtualHost("/dev");
        factory.setPort(5672);

        //消费者一般不增加自动关闭
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();

        channel.exchangeDeclare(EXCHANGE_NAME,BuiltinExchangeType.TOPIC);

        String queueName = channel.queueDeclare().getQueue();

        channel.queueBind(queueName,EXCHANGE_NAME,"*.log.*");



        Consumer consumer = new DefaultConsumer(channel){
            @Override
            public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {

                System.out.println("body=" + new String(body, StandardCharsets.UTF_8));

                //手工确认消息消费，不是多条确认
                channel.basicAck(envelope.getDeliveryTag(),false);

            }
        };

        //消费，关闭消息自动确认
        channel.basicConsume(queueName,false,consumer);

    }
}

生产者

package net.xdclass.topic;

import com.rabbitmq.client.BuiltinExchangeType;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;

import java.nio.charset.StandardCharsets;

public class Send {

    private final static String EXCHANGE_NAME = "exchange_topic";

    public static void main(String[] argv) throws Exception {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("47.98.122.108");
        factory.setUsername("admin");
        factory.setPassword("123456");
        factory.setVirtualHost("/dev");
        factory.setPort(5672);

        /**
         * 消息生产者不用过多操作，只需要和交换机绑定即可
         */
        try (//创建连接
             Connection connection = factory.newConnection();
             //创建信道
             Channel channel = connection.createChannel()) {

            //绑定交换机
            channel.exchangeDeclare(EXCHANGE_NAME, BuiltinExchangeType.TOPIC);

            String error = "我是订单服务的error日志";
            String info = "我是订单服务的info日志";
            String debug = "我是订单服务的debug日志";

            channel.basicPublish(EXCHANGE_NAME, "order.log.error", null, error.getBytes(StandardCharsets.UTF_8));
            channel.basicPublish(EXCHANGE_NAME, "order.log.info", null, info.getBytes(StandardCharsets.UTF_8));
            channel.basicPublish(EXCHANGE_NAME, "product.log.debug", null, debug.getBytes(StandardCharsets.UTF_8));

            System.out.println("topic发送成功");



        }
    }
}

交换机同过通配符进行转发到对应的队列，* 代表一个词，#代表1个或多个词
一般用#作为通配符居多，比如 #.order, 会匹配 info.order 、sys.error.order,
 而 *.order ，只会匹配 info.order, 之间是使用. 点进行分割多个词的； 
 如果是 .， 则info.order、error.order都会匹配