RocketMQ 因其架构简单、业务功能丰富、具备极强可扩展性等特点被众多企业开发者以及云厂商广泛采用。历经十余年的大规模场景打磨，RocketMQ 已经成为业内共识的金融级可靠业务消息首选方案，被广泛应用于互联网、大数据、移动互联网、物联网等领域的业务场景

1、官网下载 RocketMQ

2、安装 RocketMQ

3、启动 RocketMQ

4、代码测试

5、RocketMQ Dashboard 安装

6、关闭 RocketMQ

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1、官网下载 RocketMQ

RocketMQ 官网：https://rocketmq.apache.org/

笔者这里选择 4.9.4版本

2、安装 RocketMQ

下载安装包后，将安装包上传到 linux

创建 RocketMQ 安装目录

mkdir -p /usr/local/rocketmq

将安装包解压到新建的安装目录

unzip -d /usr/local/rocketmq rocketmq-all-4.9.4-bin-release.zip

如果没有安装 unzip，可以执行下面命令安装

yum install -y unzip zip

进入 rocketmq 安装目类

cd /usr/local/rocketmq/rocketmq-all-4.9.4-bin-release

创建存放数据的目录

mkdir -p store store/commitlog store/consumequeue

进入 conf 目录

cd conf

编辑 broker.conf 文件

vi broker.conf

在 broker.conf 文件中追加下面内容

listenPort=10911
namesrvAddr=localhost:9876
storePathRootDir=/usr/local/rocketmq/rocketmq-all-4.9.4-bin-release/store
storePathCommitLog=/usr/local/rocketmq/rocketmq-all-4.9.4-bin-release/store/commitlog
storePathConsumerQueue=/usr/local/rocketmq/rocketmq-all-4.9.4-bin-release/store/consumequeue

修改内存大小（这步不是必须的，如果你的机器内存足够，可以跳过这步，笔者机器内存只有1g，因此需要修改内存大小）

进入 bin 目录

cd /usr/local/rocketmq/rocketmq-all-4.9.4-bin-release/bin

编辑 runbroker.sh 文件和 runserver.sh 文件，修改内存大小

编辑 runbroker.sh 文件，将 8g 修改为 512m

vi runbroker.sh

修改后

编辑 runserver.sh 文件

vi runserver.sh

这里对 java 版本进行了判断，上面 2 处配置笔者都修改为 512m

开放防火墙 9876 和 10911 端口

firewall-cmd --zone=public --add-port=9876/tcp --permanent

firewall-cmd --zone=public --add-port=10911/tcp --permanent

更新防火墙规则（无需断开连接，动态添加规则）

firewall-cmd --reload

查看防火墙所有开放的端口

firewall-cmd --list-port

3、启动 RocketMQ

在 bin 目录下，执行下面命令

启动nameserver

nohup sh mqnamesrv &

启动 broker

nohup sh mqbroker -c /usr/local/rocketmq/rocketmq-all-4.9.4-bin-release/conf/broker.conf &

4、代码测试

新建 maven 项目，添加 rocketmq-client 依赖

<dependency>
    <groupId>org.apache.rocketmq</groupId>
    <artifactId>rocketmq-client</artifactId>
    <version>4.9.4</version>
</dependency>

官网示例

生产者代码

将 ip 地址修改为 linux 地址，笔者这里是 192.168.0.103

package client.sample;

import org.apache.rocketmq.client.producer.DefaultMQProducer;
import org.apache.rocketmq.client.producer.SendResult;
import org.apache.rocketmq.common.message.Message;
import org.apache.rocketmq.remoting.common.RemotingHelper;

/**
 * SyncProducer
 *
 * @author wsjz
 * @date 2022/07/01
 */
public class SyncProducer {

    public static void main(String[] args) throws Exception {
        //Instantiate with a producer group name.
        DefaultMQProducer producer = new
                DefaultMQProducer("please_rename_unique_group_name");
        // Specify name server addresses.
        producer.setNamesrvAddr("192.168.0.103:9876");
        //Launch the instance.
        producer.start();
        for (int i = 0; i < 100; i++) {
            //Create a message instance, specifying topic, tag and message body.
            Message msg = new Message("TopicTest" /* Topic */,
                    "TagA" /* Tag */,
                    ("Hello RocketMQ " +
                            i).getBytes(RemotingHelper.DEFAULT_CHARSET) /* Message body */
            );
            //Call send message to deliver message to one of brokers.
            SendResult sendResult = producer.send(msg);
            System.out.printf("%s%n", sendResult);
        }
        //Shut down once the producer instance is not longer in use.
        producer.shutdown();
    }
}

消费者代码

package client.sample;

import org.apache.rocketmq.client.consumer.DefaultMQPushConsumer;
import org.apache.rocketmq.client.consumer.listener.ConsumeConcurrentlyContext;
import org.apache.rocketmq.client.consumer.listener.ConsumeConcurrentlyStatus;
import org.apache.rocketmq.client.consumer.listener.MessageListenerConcurrently;
import org.apache.rocketmq.client.exception.MQClientException;
import org.apache.rocketmq.common.message.MessageExt;
import java.util.List;

/**
 * Consumer
 *
 * @author wsjz
 * @date 2022/07/01
 */
public class Consumer {

    public static void main(String[] args) throws InterruptedException, MQClientException {

        // Instantiate with specified consumer group name.
        DefaultMQPushConsumer consumer = new DefaultMQPushConsumer("please_rename_unique_group_name");

        // Specify name server addresses.
        consumer.setNamesrvAddr("192.168.0.103:9876");

        // Subscribe one more more topics to consume.
        consumer.subscribe("TopicTest", "*");
        // Register callback to execute on arrival of messages fetched from brokers.
        consumer.registerMessageListener(new MessageListenerConcurrently() {

            @Override
            public ConsumeConcurrentlyStatus consumeMessage(List<MessageExt> msgs,
                                                            ConsumeConcurrentlyContext context) {
                System.out.printf("%s Receive New Messages: %s %n", Thread.currentThread().getName(), msgs);
                return ConsumeConcurrentlyStatus.CONSUME_SUCCESS;
            }
        });

        //Launch the consumer instance.
        consumer.start();

        System.out.printf("Consumer Started.%n");
    }
}

运行效果