关于springboot:spring-boot集成mqtt协议发送和订阅数据

maven 的 pom.xml 引入包

        <!--mqtt-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-integration</artifactId>
            <version>2.3.6.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.integration</groupId>
            <artifactId>spring-integration-stream</artifactId>
            <version>5.3.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.integration</groupId>
            <artifactId>spring-integration-mqtt</artifactId>
            <version>5.3.4.RELEASE</version>
        </dependency>

mqtt.yml 配置文件

spring:
  mqtt:
    username: admin
    password: beyond_2021
    url: tcp://192.168.3.100:1883
    client-id: data-clientId
    server-id: data-serverId
    data-topic: data/#
    will-topic: data-will
    will-content: data server offline
    completion-timeout: 10000

初始化 MQTT 配置 bean

package com.beyond.config;

import org.eclipse.paho.client.mqttv3.MqttConnectOptions;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.event.EventListener;
import org.springframework.integration.annotation.IntegrationComponentScan;
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.event.MqttConnectionFailedEvent;
import org.springframework.integration.mqtt.event.MqttMessageDeliveredEvent;
import org.springframework.integration.mqtt.event.MqttMessageSentEvent;
import org.springframework.integration.mqtt.event.MqttSubscribedEvent;
import org.springframework.integration.mqtt.inbound.MqttPahoMessageDrivenChannelAdapter;
import org.springframework.integration.mqtt.outbound.MqttPahoMessageHandler;
import org.springframework.integration.mqtt.support.DefaultPahoMessageConverter;
import org.springframework.integration.mqtt.support.MqttHeaders;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.MessageHandler;
import org.springframework.messaging.MessagingException;

import java.security.SecureRandom;
import java.util.Date;


@Configuration
@IntegrationComponentScan
public class MqttConfig {private static final Logger log = LoggerFactory.getLogger(MqttConfig.class);

    @Value("${spring.mqtt.username}")
    private String username;

    @Value("${spring.mqtt.password}")
    private String password;

    @Value("${spring.mqtt.url}")
    private String hostUrl;

    @Value("${spring.mqtt.client-id}")
    private String clientId;

    @Value("${spring.mqtt.server-id}")
    private String serverId;

    @Value("${spring.mqtt.data-topic:data/#}")
    private String dataTopic;

    @Value("${spring.mqtt.will-topic}")
    private String willTopic;

    @Value("${spring.mqtt.will-content}")
    private String willContent;

    /**
     * @desc 连贯超时
     */
    @Value("${spring.mqtt.completion-timeout}")
    private int completionTimeout ;

    @Bean
    public MqttConnectOptions getMqttConnectOptions(){
        // MQTT 的连贯设置
        MqttConnectOptions mqttConnectOptions = new MqttConnectOptions();
        // 设置连贯的用户名
        mqttConnectOptions.setUserName(username);
        // 设置连贯的明码
        mqttConnectOptions.setPassword(password.toCharArray());
        // 设置是否清空 session, 这里如果设置为 false 示意服务器会保留客户端的连贯记录，// 把配置里的 cleanSession 设为 false，客户端掉线后 服务器端不会革除 session，// 当重连后能够接管之前订阅主题的音讯。当客户端上线后会承受到它离线的这段时间的音讯
        mqttConnectOptions.setCleanSession(true);
        // 设置公布端地址, 多个用逗号分隔, 如:tcp://111:1883,tcp://222:1883
        // 当第一个 111 连贯上后,222 不会在连, 如果 111 挂掉后, 重试连 111 几次失败后, 会主动去连贯 222
        mqttConnectOptions.setServerURIs(hostUrl.split(","));
        // 设置会话心跳工夫 单位为秒 服务器会每隔 1.5*20 秒的工夫向客户端发送个音讯判断客户端是否在线，但这个办法并没有重连的机制
        mqttConnectOptions.setKeepAliveInterval(20);
        mqttConnectOptions.setAutomaticReconnect(true);
        // 设置“遗嘱”音讯的话题，若客户端与服务器之间的连贯意外中断，服务器将公布客户端的“遗嘱”音讯。mqttConnectOptions.setWill(willTopic, willContent.getBytes(), 2, false);
        mqttConnectOptions.setMaxInflight(1000000);
        return mqttConnectOptions;
    }

    @Bean
    public MqttPahoClientFactory mqttClientFactory() {DefaultMqttPahoClientFactory factory = new DefaultMqttPahoClientFactory();
        factory.setConnectionOptions(getMqttConnectOptions());
        return factory;
    }

    /**
     * @desc 发送通道配置 默认主题
     * @date 2021/3/16
     */
    @Bean
    @ServiceActivator(inputChannel = "mqttOutboundChannel")
    public MessageHandler mqttOutbound() {
        //clientId 每个连贯必须惟一, 否则, 两个雷同的 clientId 互相挤掉线
        String clientIdStr = clientId + new SecureRandom().nextInt(10);
        MqttPahoMessageHandler messageHandler = new MqttPahoMessageHandler(clientIdStr, mqttClientFactory());
        //async 如果为 true，则调用方不会阻塞。而是在发送音讯时期待传递确认。默认值为 false（发送将阻塞，直到确认发送)
        messageHandler.setAsync(true);
        messageHandler.setAsyncEvents(true);
        messageHandler.setDefaultTopic(dataTopic);
        messageHandler.setDefaultQos(1);
        return messageHandler;
    }

    /**
     * @desc 发送通道
     * @date 2021/3/16
     */
    @Bean
    public MessageChannel mqttOutboundChannel() {return new DirectChannel();
    }

    /**
     * @desc 接管通道
     * @date 2021/3/16
     */
    @Bean
    public MessageChannel mqttInputChannel() {return new DirectChannel();
    }

    /**
     * @desc 配置监听的 topic 反对通配符
     * @date 2021/3/16
     */
    @Bean
    public MessageProducer inbound() {
        //clientId 每个连贯必须惟一, 否则, 两个雷同的 clientId 互相挤掉线
        String serverIdStr = serverId + new SecureRandom().nextInt(10);
        MqttPahoMessageDrivenChannelAdapter adapter =
                new MqttPahoMessageDrivenChannelAdapter(serverIdStr, mqttClientFactory(), dataTopic);
        adapter.setCompletionTimeout(completionTimeout);
        adapter.setConverter(new DefaultPahoMessageConverter());
        adapter.setQos(1);
        adapter.setOutputChannel(mqttInputChannel());
        return adapter;
    }

    /**
     * @desc 通过通道获取数据 订阅的数据
     * @date 2021/3/16
     */
    @Bean
    @ServiceActivator(inputChannel = "mqttInputChannel")
    public MessageHandler handler() {return new MessageHandler() {
            @Override
            public void handleMessage(Message<?> message) throws MessagingException {String payload = message.getPayload().toString();
                String topic = message.getHeaders().get(MqttHeaders.RECEIVED_TOPIC).toString();
                ////////////////// 解决订阅 topic:(data/#)到的所有的数据
            }
        };
    }

    /**
     * @desc mqtt 连贯失败或者订阅失败时, 触发 MqttConnectionFailedEvent 事件
     * @date 2021/7/22
      *@param event
     * @return void
     */
    @EventListener(MqttConnectionFailedEvent.class)
    public void mqttConnectionFailedEvent(MqttConnectionFailedEvent event) {
        log.error("mqttConnectionFailedEvent 连贯 mqtt 失败:" +
                "date={}, hostUrl={}, username={}, error={}",
                new Date(), hostUrl, username, event.getCause().getMessage());
    }

    /**
     * @desc 当 async 和 async 事件 (async-events) 都为 true 时, 将收回 MqttMessageSentEvent
     * 它蕴含音讯、主题、客户端库生成的音讯 id、clientId 和 clientInstance（每次连贯客户端时递增）* @date 2021/7/22
      *@param event
     * @return void
     */
    @EventListener(MqttMessageSentEvent.class)
    public void mqttMessageSentEvent(MqttMessageSentEvent event) {log.info("mqttMessageSentEvent 发送信息: date={}, info={}", new Date(), event.toString());
    }

    /**
     * @desc 当 async 和 async 事件 (async-events) 都为 true 时, 将收回 MqttMessageDeliveredEvent
     * 当客户端库确认传递时，将收回 MqttMessageDeliveredEvent。它蕴含 messageId、clientId 和 clientInstance，使传递与发送相干。* @date 2021/7/22
      *@param event
     * @return void
     */
    @EventListener(MqttMessageDeliveredEvent.class)
    public void mqttMessageDeliveredEvent(MqttMessageDeliveredEvent event) {log.info("mqttMessageDeliveredEvent 发送胜利信息: date={}, info={}", new Date(), event.toString());
    }

    /**
     * @desc 胜利订阅到主题，MqttSubscribedEvent 事件就会被触发(多个主题, 屡次触发)
     * @date 2021/7/22
      *@param event
     * @return void
     */
    @EventListener(MqttSubscribedEvent.class)
    public void mqttSubscribedEvent(MqttSubscribedEvent event) {log.info("mqttSubscribedEvent 订阅胜利信息: date={}, info={}", new Date(), event.toString());
    }

}

mqtt 发送数据网关配置

package com.beyond.data.component;

import org.springframework.integration.annotation.MessagingGateway;
import org.springframework.integration.mqtt.support.MqttHeaders;
import org.springframework.messaging.handler.annotation.Header;
import org.springframework.stereotype.Component;

/**
 * @desc MQTT 发送网关
 * @date 2021/3/12
 */
@Component
@MessagingGateway(defaultRequestChannel = "mqttOutboundChannel")
public interface MqttGatewayComponent {void sendToMqtt(String data);

    void sendToMqtt(String payload, @Header(MqttHeaders.TOPIC) String topic);

    void sendToMqtt(@Header(MqttHeaders.TOPIC) String topic, @Header(MqttHeaders.QOS) int qos, String payload);

}

发送数据到 mqtt 伪代码

@Autowired
private MqttGatewayComponent mqttGatewayComponent;

// 发送字符串或 json 字符串, 到指定的 topic
mqttGatewayComponent.sendToMqtt("json string", "data/abcd");

参考链接:
https://blog.csdn.net/sinat_2…
https://blog.csdn.net/qq_2946…
https://blog.csdn.net/myinser…