MQTT Java入门-搭建MQTT服务器

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MQTT协议 Java入门教程，通过Apache ActiveMQ Artemis搭建MQTT服务器。

首先下载Apache ActiveMQ Artemis，目前Apache ActiveMQ Artemis 主要版本有2.19.x和2.20.x，需要注意2.19.x需要的jdk环境是1.8即可，2.20.x需要jdk11+，这里我使用的是2.19.x。Apache ActiveMQ Artemis 支持 MQTT v3.1.1，更多MQTT支持信息可以查看ActiveMQ (apache.org)

Apache ActiveMQ Artemis下载

apache-artemis-2.19.1-bin.zip
下载好文件以后，移动到/opt目录并解压

mv apache-artemis-2.19.1-bin.zip /opt
cd /opt
unzip apache-artemis-2.19.1-bin.zip

进入bin目录

cd apache-artemis-2.19.1/bin

创建broker

./artemis create broker

根据提示输入账号和密码

Creating ActiveMQ Artemis instance at: /opt/apache-artemis-2.19.1/bin/broker

--user:
Please provide the default username:
admin

--password: is mandatory with this configuration:
Please provide the default password:


--allow-anonymous | --require-login:
Allow anonymous access?, valid values are Y,N,True,False
N

Auto tuning journal ...
done! Your system can make 14.71 writes per millisecond, your journal-buffer-timeout will be 68000

You can now start the broker by executing:  

   "/opt/apache-artemis-2.19.1/bin/broker/bin/artemis" run

Or you can run the broker in the background using:

   "/opt/apache-artemis-2.19.1/bin/broker/bin/artemis-service" start

完成后会给出启动命令

broker访问权限配置

cd borker/etc
vi jolokia-access.xml

修改bootstrap.xml配置web的访问地址
默认是

   <web bind="http://localhost:8161" path="web">
       <app url="activemq-branding" war="activemq-branding.war"/>
       <app url="artemis-plugin" war="artemis-plugin.war"/>
       <app url="console" war="console.war"/>
   </web>

修改为自己电脑的局域网ip，端口注意不冲突就行

   <!-- The web server is only bound to localhost by default -->
   <web bind="http://192.168.79.133:8161" path="web">
       <app url="activemq-branding" war="activemq-branding.war"/>
       <app url="artemis-plugin" war="artemis-plugin.war"/>
       <app url="console" war="console.war"/>
   </web>

启动broker

"/opt/apache-artemis-2.19.1/bin/broker/bin/artemis-service" start

启动命令来源于创建broker时候的提示
重启命令
"/opt/apache-artemis-2.19.1/bin/broker/bin/artemis-service" restart
有可能61616端口不能访问

firewall-cmd --query-port=61616/tcp // 查看端口是否已开
firewall-cmd --add-port=61616/tcp --permanent //添加端口
firewall-cmd --reload //重新载入端口