SpringBoot整合mqtt协议，实现订阅topic并将消息存储到mysql数据库

所需依赖如下：

<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.springframework.integration</groupId>
            <artifactId>spring-integration-mqtt</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.72</version>
        </dependency>
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.4.2</version>
        </dependency>
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper-spring-boot-starter</artifactId>
            <version>1.3.1</version>
        </dependency>
    </dependencies>

示例代码如下：

package com.cyl.mqttdemo.config;

import com.alibaba.fastjson.JSONObject;
import com.cyl.mqttdemo.entity.SysData;
import com.cyl.mqttdemo.service.SysDataService;
import org.eclipse.paho.client.mqttv3.MqttConnectOptions;
import org.eclipse.paho.client.mqttv3.MqttMessage;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.integration.annotation.ServiceActivator;
import org.springframework.integration.channel.DirectChannel;
import org.springframework.integration.core.MessageProducer;
import org.springframework.integration.mqtt.core.DefaultMqttPahoClientFactory;
import org.springframework.integration.mqtt.core.MqttPahoClientFactory;
import org.springframework.integration.mqtt.inbound.MqttPahoMessageDrivenChannelAdapter;
import org.springframework.integration.mqtt.support.DefaultPahoMessageConverter;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.MessageHandler;

/**
 * @author cyl
 * @time 2022/8/4
 */
@Configuration
public class MqttReceiveConfig {

    @Autowired
    private SysDataService dataService;

    @Bean
    public MqttConnectOptions getMqttConnectOptions() {
        MqttConnectOptions mqttConnectOptions = new MqttConnectOptions();
        //mqttConnectOptions.setUserName("6KvPBqHX");
        mqttConnectOptions.setUserName("FZgZdPNfgjwgncaT");

        //mqttConnectOptions.setPassword("riEtkxce".toCharArray());

        mqttConnectOptions.setPassword("SuiCSeQ3omdybpGt".toCharArray());
        //String[] hostArray = new String[]{"tcp://mqtt.lnxall.com:3883"};
        String[] hostArray = new String[]{"tcp://173.16.200.25:3883"};
        mqttConnectOptions.setServerURIs(hostArray);
        mqttConnectOptions.setKeepAliveInterval(2);
        mqttConnectOptions.setCleanSession(false);
        return mqttConnectOptions;
    }
    @Bean
    public MqttPahoClientFactory mqttClientFactory() {
        DefaultMqttPahoClientFactory factory = new DefaultMqttPahoClientFactory();
        factory.setConnectionOptions(getMqttConnectOptions());
        return factory;
    }
    // 点对点路由通道
    @Bean
    public MessageChannel mqttInputChannel() {
        return new DirectChannel();
    }
    // 定义入站消息适配器
    @Bean
    public MessageProducer inbound() {
        // 定义监听的topic名称ClientId等信息
        MqttPahoMessageDrivenChannelAdapter adapter = new MqttPahoMessageDrivenChannelAdapter("java-mqtt", mqttClientFactory(), "/sys/00000000/#"); // 94fbRocF
        adapter.setCompletionTimeout(5000);
        adapter.setConverter(new DefaultPahoMessageConverter());
        adapter.setQos(1);
        adapter.setOutputChannel(mqttInputChannel());
        return adapter;
    }
    //  可调用Spring的Bean来处理消息，并将处理后的结果输出到指定的消息通道
    @Bean
    @ServiceActivator(inputChannel = "mqttInputChannel")
    public MessageHandler handler() {
        return message -> {
            MqttMessage mqttMessage = JSONObject.parseObject(message.getPayload().toString(), MqttMessage.class);
            // 这里可以根据不同的topic name处理不同的业务逻辑
            String topic = message.getHeaders().get("mqtt_receivedTopic").toString();
            String[] split = topic.split("/");
            if (split.length==5&& "service".equals(split[4])) {
                System.out.println("------------------------------------");
                System.out.println("topic:" + topic);
                String payload = message.getPayload().toString();
                System.out.println("payload:" + payload);
                System.out.println("------------------------------------");

                SysData data = JSONObject.parseObject(payload, SysData.class);
                dataService.save(data);
            }
        };
    }

}