Mqtt消息发送、主题订阅

<!-- mqtt依赖 -->
<dependency>
    <groupId>org.springframework.integration</groupId>
    <artifactId>spring-integration-mqtt</artifactId>
</dependency>

-- application.yml配置

mqtt:
  client:
    url: tcp://ip:port
    username: admin
    password: public
    topic: /test_topic/#
    completionTimeout: 3000
    clientId: 123456
    enabled: true
    qos: 0

-- 创建mq连接信息实体

@Component
@Data
public class MqttBase {

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

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

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

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

    @Value("${spring.mqtt.client.completionTimeout}")
    private Integer completionTimeout;
    @Value("${spring.mqtt.client.qos}")
    private Integer qos;
    @Value("${spring.mqtt.client.clientId}")
    private String clientId;
}

-- mq工具类

@Configuration
@Slf4j
public class MqttConfig {

    @Autowired
    private MqttBase mqttBase;

    /*****
     * 创建MqttPahoClientFactory，设置MQTT Broker连接属性，如果使用SSL验证，也在这里设置。
     * @return
     */
    @Bean
    public MqttPahoClientFactory mqttClientFactory() {
        DefaultMqttPahoClientFactory factory = new DefaultMqttPahoClientFactory();
        MqttConnectOptions options = new MqttConnectOptions();
        options.setServerURIs(new String[]{mqttBase.getMqttHost()});
        options.setUserName(mqttBase.getMqttUserName());
        options.setPassword(mqttBase.getMqttPwd().toCharArray());
        factory.setConnectionOptions(options);
        return factory;
    }

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

    @Bean
    public MessageProducer inbound() {
        MqttPahoMessageDrivenChannelAdapter adapter = new MqttPahoMessageDrivenChannelAdapter(mqttBase.getClientId() + System.currentTimeMillis(),
                mqttClientFactory(), mqttBase.getTopic());
        adapter.setCompletionTimeout(mqttBase.getCompletionTimeout());
        adapter.setConverter(new DefaultPahoMessageConverter());
        adapter.setQos(mqttBase.getQos());
        adapter.setOutputChannel(mqttInputChannel());
        return adapter;
    }

    @Bean
    //ServiceActivator注解表明当前方法用于处理MQTT消息，inputChannel参数指定了用于消费消息的channel。
    @ServiceActivator(inputChannel = "mqttInputChannel")
    public MessageHandler handler() {
        return message -> {


            String payload = message.getPayload().toString();
            String topic = message.getHeaders().get(MqttHeaders.RECEIVED_TOPIC).toString();
            // 根据topic分别进行消息处理。

            log.info(topic + "主题，消息为{}",payload);

            switch (topic) {
                case YUAN_AN_ELECTRIC_TOPIC:
                    break;
                case YUAN_AN_ENVIRONMENT_TOPIC:
                    break;
                default:

                    log.info(topic + ": 未处理消息" + payload);
            }
        };
    }

    // 发送消息

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

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

    @MessagingGateway(defaultRequestChannel = "mqttOutboundChannel")
    public interface MqttGateway {

        // 定义重载方法，用于消息发送
        void sendToMqtt(String payload);

        // 指定topic进行消息发送
        void sendToMqtt(@Header(MqttHeaders.TOPIC) String topic, String payload);

        // 指定topic和qos进行消息发送
        void sendToMqtt(@Header(MqttHeaders.TOPIC) String topic, @Header(MqttHeaders.QOS) int qos, String payload);
    }
}

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