springboot集成mqtt

1. 前言

这里我们使用springboot搭建一个轻量级的mqtt客户端，连接mqtt的Broker服务。

连接信息写在配置文件里application.properties

spring.mqtt.username=admin
spring.mqtt.mqpassword=admin
spring.mqtt.host-url= tcp://127.0.0.1:1883
spring.mqtt.client-id= server_client_${random.value}
spring.mqtt.default-topic= $SYS/brokers/+/clients/#
spring.mqtt.completionTimeout= 3000
spring.mqtt.keepAlive= 60

2. 引入依赖

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

3. 配置文件

新建MqttProperties.java文件，初始化application里的mqtt配置项

/** * @author Eric * @date 2020年5月14日 */
@ConfigurationProperties("spring.mqtt")
@Component
@Getter
@Setter
public class MqttProperties {
   

    private String username;

    private String mqpassword;

    private String hostUrl;

    private String clientId;

    private String defaultTopic;

    private String completionTimeout;

    private Integer keepAlive;
}

新建MqttConfiguration.java文件，为mqtt做初始化配置

/** * @author Eric * @date 2020年5月14日 */
@Configuration
@Slf4j
public class MqttConfiguration {
   
    @Autowired
    private MqttProperties mqttProperties;
    /** * 事件触发 */
    @Autowired
    private ApplicationEventPublisher eventPublisher;

    @Bean
    public MqttConnectOptions getMqttConnectOptions(){
   
        MqttConnectOptions mqttConnectOptions=new MqttConnectOptions();
        mqttConnectOptions.setUserName(mqttProperties.getUsername());
        mqttConnectOptions.setPassword(mqttProperties.getMqpassword().toCharArray());
        mqttConnectOptions.setServerURIs(new String[]{
   mqttProperties.getHostUrl()});
        mqttConnectOptions.setKeepAliveInterval(2);
        mqttConnectOptions.setKeepAliveInterval(mqttProperties.getKeepAlive());
        return mqttConnectOptions;
    }
    @Bean
    public MqttPahoClientFactory mqttClientFactory() {
   
        DefaultMqttPahoClientFactory factory = new DefaultMqttPahoClientFactory();
        factory.setConnectionOptions(getMqttConnectOptions());
        return factory;
    }

    @Bean
    public MessageChannel mqttInputChannel() {
   
        return new DirectChannel();
    }

    /** * 配置client,监听的topic */
    @Bean
    public MessageProducer inbound() {
   
        MqttPahoMessageDrivenChannelAdapter adapter =
                new MqttPahoMessageDrivenChannelAdapter(mqttProperties.getClientId()+"_inbound", mqttClientFactory(),
                        mqttProperties.getDefaultTopic().split(","));
        adapter.setCompletionTimeout(Long.valueOf(mqttProperties.getCompletionTimeout()));
        adapter.setConverter(new DefaultPahoMessageConverter());
        //默认添加TopicName中所有tipic
        adapter.addTopic("+/+/test");
        adapter.setQos(2);
        adapter.setOutputChannel(mqttInputChannel());
        return adapter;
    }

    @Bean
    @ServiceActivator(inputChannel = "mqttInputChannel")
    public MessageHandler handler() {
   
        return new MessageHandler() {
   
            @Override
            public void handleMessage(Message<?> message) throws MessagingException {
   
                String topic = message.getHeaders().get("mqtt_receivedTopic").toString();
                String qos = message.getHeaders().get("mqtt_receivedQos").toString();
                //触发事件 这里不再做业务处理，包 listener中做处理
                eventPublisher.publishEvent(new MqttEvent(this,topic,message.getPayload().toString()));
            }
        };
    }

    /** * 发送消息和消费消息Channel可以使用相同MqttPahoClientFactory * * @return */
    @Bean
    @ServiceActivator(inputChannel = "mqttOutboundChannel")
    public MessageHandler mqttOutbound() {
   
        // 在这里进行mqttOutboundChannel的相关设置
        MqttPahoMessageHandler messageHandler =  new MqttPahoMessageHandler(mqttProperties.getClientId(), mqttClientFactory());
        // 如果设置成true，发送消息时将不会阻塞。
        messageHandler.setAsync(true);
        messageHandler.setDefaultTopic(mqttProperties.getDefaultTopic());
        return messageHandler;
    }

    @Bean
    public MessageChannel mqttOutboundChannel() {
   
        return new DirectChannel();
    }
}

4. MQTT消息类

新建MqttEvent.java 消息类。用于发送mqtt的消息

/** * topic事件 * @author Eric * @date 2020年5月23日 */
@Getter
public class MqttEvent extends ApplicationEvent {
   

    private String topic;
    /** * 发送的消息 */
    private String message;

    public MqttEvent(Object source,String topic,String message) {
   
        super(source);
        this.topic = topic;
        this.message = message;
    }
}

5. MQTT消息接收器

新建JobListener.java文件作为 mqtt的消息接收类

/** * 触发event topic 事件 * @author Eric * @date 2020年5月23日 */
@Slf4j
@Component
public class JobListener {
   

    @Autowired
    DeviceDao deviceDao;

    /** * 监听topic * @param mqttEvent */
    @EventListener(condition = "#mqttEvent.topic.startsWith('pay')")
    public void onEmqttCall1(MqttEvent mqttEvent) throws Exception {
   
        String topic = mqttEvent.getTopic();
		//写逻辑处理
    }
    
    /** * 监听topic * @param mqttEvent */
    @EventListener(condition = "#mqttEvent.topic.equals('device')")
    public void onEmqttCallT(MqttEvent mqttEvent){
   
        log.info("接收到消11111111111："+mqttEvent.getMessage());
    }
}

6. MQTT消息发送器

新建MqttGateway.java 提供发送mqttt消息的接口服务

/** * 触发event topic 事件 * @author Eric * @date 2020年5月23日 */
@Component
@MessagingGateway(defaultRequestChannel = "mqttOutboundChannel")
public interface MqttGateway {
   
    void sendToMqtt(String data);

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

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

7. 测试MQTT发送消息

/** * @version 1.0 * @author: eric * @date: 2022/7/1 上午 11:03 */
@SpringBootTest
public class Test3 {
   
    @Autowired
    MqttGateway mqttGateway;

    @Test
    public void mqttTest () {
   
      mqttGateway.sendToMqtt("111//222/33","消息内容");
    }
}