spring boot集成mqtt協(xié)議發(fā)送和訂閱數(shù)據(jù)

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 連接超時
     */
    @Value("${spring.mqtt.completion-timeout}")
    private int completionTimeout ;

    @Bean
    public MqttConnectOptions getMqttConnectOptions(){
        // MQTT的連接設(shè)置
        MqttConnectOptions mqttConnectOptions = new MqttConnectOptions();
        // 設(shè)置連接的用戶名
        mqttConnectOptions.setUserName(username);
        // 設(shè)置連接的密碼
        mqttConnectOptions.setPassword(password.toCharArray());
        // 設(shè)置是否清空session,這里如果設(shè)置為false表示服務(wù)器會保留客戶端的連接記錄，
        // 把配置里的 cleanSession 設(shè)為false，客戶端掉線后 服務(wù)器端不會清除session，
        // 當(dāng)重連后可以接收之前訂閱主題的消息。當(dāng)客戶端上線后會接受到它離線的這段時間的消息
        mqttConnectOptions.setCleanSession(true);
        // 設(shè)置發(fā)布端地址,多個用逗號分隔, 如:tcp://111:1883,tcp://222:1883
        // 當(dāng)?shù)谝粋€111連接上后,222不會在連,如果111掛掉后,重試連111幾次失敗后,會自動去連接222
        mqttConnectOptions.setServerURIs(hostUrl.split(","));
        // 設(shè)置會話心跳時間 單位為秒 服務(wù)器會每隔1.5*20秒的時間向客戶端發(fā)送個消息判斷客戶端是否在線，但這個方法并沒有重連的機(jī)制
        mqttConnectOptions.setKeepAliveInterval(20);
        mqttConnectOptions.setAutomaticReconnect(true);
        // 設(shè)置“遺囑”消息的話題，若客戶端與服務(wù)器之間的連接意外中斷，服務(wù)器將發(fā)布客戶端的“遺囑”消息。
        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 發(fā)送通道配置 默認(rèn)主題
     * @date 2021/3/16
     */
    @Bean
    @ServiceActivator(inputChannel = "mqttOutboundChannel")
    public MessageHandler mqttOutbound() {
        //clientId每個連接必須唯一,否則,兩個相同的clientId相互擠掉線
        String clientIdStr = clientId + new SecureRandom().nextInt(10);
        MqttPahoMessageHandler messageHandler = new MqttPahoMessageHandler(clientIdStr, mqttClientFactory());
        //async如果為true，則調(diào)用方不會阻塞。而是在發(fā)送消息時等待傳遞確認(rèn)。默認(rèn)值為false（發(fā)送將阻塞，直到確認(rèn)發(fā)送)
        messageHandler.setAsync(true);
        messageHandler.setAsyncEvents(true);
        messageHandler.setDefaultTopic(dataTopic);
        messageHandler.setDefaultQos(1);
        return messageHandler;
    }

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

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

    /**
     * @desc 配置監(jiān)聽的 topic 支持通配符
     * @date 2021/3/16
     */
    @Bean
    public MessageProducer inbound() {
        //clientId每個連接必須唯一,否則,兩個相同的clientId相互擠掉線
        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 通過通道獲取數(shù)據(jù) 訂閱的數(shù)據(jù)
     * @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();
                //////////////////處理訂閱topic:(data/#)到的所有的數(shù)據(jù)
            }
        };
    }

    /**
     * @desc mqtt連接失敗或者訂閱失敗時,觸發(fā)MqttConnectionFailedEvent事件
     * @date 2021/7/22
      *@param event
     * @return void
     */
    @EventListener(MqttConnectionFailedEvent.class)
    public void mqttConnectionFailedEvent(MqttConnectionFailedEvent event) {
        log.error("mqttConnectionFailedEvent連接mqtt失敗: " +
                "date={}, hostUrl={}, username={}, error={}",
                new Date(), hostUrl, username, event.getCause().getMessage());
    }

    /**
     * @desc 當(dāng)async和async事件(async-events)都為true時,將發(fā)出MqttMessageSentEvent
     * 它包含消息、主題、客戶端庫生成的消息id、clientId和clientInstance（每次連接客戶端時遞增）
     * @date 2021/7/22
      *@param event
     * @return void
     */
    @EventListener(MqttMessageSentEvent.class)
    public void mqttMessageSentEvent(MqttMessageSentEvent event) {
        log.info("mqttMessageSentEvent發(fā)送信息: date={}, info={}", new Date(), event.toString());
    }

    /**
     * @desc 當(dāng)async和async事件(async-events)都為true時,將發(fā)出MqttMessageDeliveredEvent
     * 當(dāng)客戶端庫確認(rèn)傳遞時，將發(fā)出MqttMessageDeliveredEvent。它包含messageId、clientId和clientInstance，使傳遞與發(fā)送相關(guān)。
     * @date 2021/7/22
      *@param event
     * @return void
     */
    @EventListener(MqttMessageDeliveredEvent.class)
    public void mqttMessageDeliveredEvent(MqttMessageDeliveredEvent event) {
        log.info("mqttMessageDeliveredEvent發(fā)送成功信息: date={}, info={}", new Date(), event.toString());
    }

    /**
     * @desc 成功訂閱到主題，MqttSubscribedEvent事件就會被觸發(fā)(多個主題,多次觸發(fā))
     * @date 2021/7/22
      *@param event
     * @return void
     */
    @EventListener(MqttSubscribedEvent.class)
    public void mqttSubscribedEvent(MqttSubscribedEvent event) {
        log.info("mqttSubscribedEvent訂閱成功信息: date={}, info={}", new Date(), event.toString());
    }

}
mqtt發(fā)送數(shù)據(jù)網(wǎng)關(guān)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發(fā)送網(wǎng)關(guān)
 * @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);

}
發(fā)送數(shù)據(jù)到mqtt偽代碼
@Autowired
private MqttGatewayComponent mqttGatewayComponent;

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

參考鏈接:
https://blog.csdn.net/sinat_21184471/article/details/87186186
https://blog.csdn.net/qq_29467891/article/details/107043225?utm_source=app
https://blog.csdn.net/myinsert/article/details/107715538

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