Spring boot 集成 MQTT详情

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

@Configuration
public class MqttConfig
{
    @Autowired
    private MqttProperties mqttProperties;
    /**
     * 连接器
     * @return
     */
    @Bean
    public MqttConnectOptions getMqttConnectOptions()
    {
        MqttConnectOptions mqttConnectOptions = new MqttConnectOptions();
        // 设置是否清空session，false表示服务器会保留客户端的连接记录，true表示每次连接到服务器都以新的身份连接
        mqttConnectOptions.setCleanSession(true);
        // 设置超时时间，默认30秒
        mqttConnectOptions.setConnectionTimeout(mqttProperties.getConnectionTimeOut());
        mqttConnectOptions.setKeepAliveInterval(mqttProperties.getKeepAlive());
        mqttConnectOptions.setAutomaticReconnect(true);
        // 设置连接的用户名
        mqttConnectOptions.setUserName(mqttProperties.getUsername());
        // 设置连接的密码
        mqttConnectOptions.setPassword(mqttProperties.getPassword().toCharArray());
        //服务器地址
        mqttConnectOptions.setServerURIs(new String[]{mqttProperties.getUrl()});
        mqttConnectOptions.setKeepAliveInterval(2);
        return mqttConnectOptions;
    }
    /***
     * MQTT客户端
     * @return
     */
    @Bean("mqttClientFactory")
    public MqttPahoClientFactory mqttClientFactory() {
        DefaultMqttPahoClientFactory factory = new DefaultMqttPahoClientFactory();
        factory.setConnectionOptions(getMqttConnectOptions());
        return factory;
    }
   
    /*-----------------     消息生产者的配置       ---------------------*/
    /**
     * MQTT生产端发布处理器
     *
     * @return {@link org.springframework.messaging.MessageHandler}
     */
    @Bean
    @ServiceActivator(inputChannel = "mqttOutboundChannel")
    public MessageHandler mqttOutbound() {
        MqttPahoMessageHandler messageHandler = new MqttPahoMessageHandler(mqttProperties.getProducerClientId(), mqttClientFactory());
        messageHandler.setAsync(true);
        return messageHandler;
    }
    /**
     *  MQTT生产端发布通道
     * @return
     */
    @Bean("mqttOutboundChannel")
    public MessageChannel mqttOutboundChannel() 
    {
        return new DirectChannel();
    }
    /*-----------------   消息消费者的配置       ---------------------*/
    
    /**
     * MQTT消费端订阅通道
     *
     * @return {@link org.springframework.messaging.MessageChannel}
     */
    @Bean(name = "mqttInboundChannel")
    public MessageChannel mqttInboundChannel() {
      return new DirectChannel();
    }

    /**
     * MQTT消费端连接配置
     *
     * @param channel {@link org.springframework.messaging.MessageChannel}
     * @param factory {@link org.springframework.integration.mqtt.core.MqttPahoClientFactory}
     * @return {@link org.springframework.integration.core.MessageProducer}
     */
    @Bean
    public MessageProducer inbound(
        @Qualifier("mqttInboundChannel") MessageChannel channel,
        @Qualifier("mqttClientFactory") MqttPahoClientFactory factory) {
      MqttPahoMessageDrivenChannelAdapter adapter = new MqttPahoMessageDrivenChannelAdapter(mqttProperties.getConsumerClientId(), factory, "test");
      adapter.setCompletionTimeout(30000);
      adapter.setConverter(new DefaultPahoMessageConverter());
      // 0 至多一次，数据可能丢失
      // 1 至少一次，数据可能重复
      // 2 只有一次，且仅有一次，最耗性能
      adapter.setQos(1);
      // 设置订阅通道
      adapter.setOutputChannel(channel);
      return adapter;
    }
}

@ConfigurationProperties("mqtt")
@Component
public class MqttProperties implements Serializable
{
    private static final long serialVersionUID = -1425980007744001158L;
    private String url;
    private String username;
    private String password;
    private int keepAlive;
    private int connectionTimeOut;
    private String producerClientId;
    private String producerQos;
    private String consumerClientId;
    private String consumerQos;
    private String consumerTopic;
    private int completionTimeout;
    private String defaultTopic;
    //get、set方法省略
  }

@MessagingGateway(defaultRequestChannel = "mqttOutboundChannel")
public interface MqttGateway
{
   void sendToMqtt(byte[] data,@Header(MqttHeaders.TOPIC) String topic);
}

  @Autowired
  private MqttGateway mqttGateway;
  @RequestMapping("/sendTest")
  public String sendMqttTest(String msg)
  {
      mqttGateway.send("test",msg);
      return "OK";
  }

mqtt:
  url: tcp://localhost:1883
  username: test
  password: test1234
  keep-alive: 30
  connection-timeout: 3000
  producerClientId:  test-producer
  producerQos: 1
  consumerClientId: test-consumer
  consumerQos: 1
  deafultTopic : test