记录springboot集成多个mqtt，实现重连后重新订阅

springboot整合多个mqtt

前提：实际应用中，项目需要订阅其他服务器的消息，并且把本机消息发布，所以需要连接多个mqtt，实现不同的需求
参考：https://blog.csdn.net/qq_40083897/article/details/117333716
整合大致结构如下：

1. 引入依赖

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

2.连接配置

 #MQTT配置信息
  mqtt:
    # 设备连接
    channel1:
      username: xxxxxx
      password: xxxxxx
      host: tcp://192.168.xx.xxx:1883
      clientid: device_channel1
      timeout: 1000
      keepalive: 10
      cleanSession: false
    #本地连接
    channel2:
      username: xxxxxx
      password: xxxxxx
      host: tcp://192.168.xx.xxx:1883
      clientid: local_channel2
      timeout: 1000
      keepalive: 10
      cleanSession: false

3.连接配置

@Data
public class MqttConfiguration {
   

    private String host;
    private String clientId;
    private String userName;
    private String password;
    private String topic;
    private int timeout;
    private int keepAlive;
    private boolean cleanSession;
}

@Slf4j
@Component
@Configuration
@ConfigurationProperties(MqttConfiguration1.PREFIX)
public class MqttConfiguration1 extends MqttConfiguration{
   

    //指定配置文件application-local.properties中的属性名前缀
    public static final String PREFIX = "spring.mqtt.channel1";

}
@Slf4j
@Component
@Configuration
@ConfigurationProperties(MqttConfiguration2.PREFIX)
public class MqttConfiguration2 extends MqttConfiguration{
   

    //指定配置文件application-local.properties中的属性名前缀
    public static final String PREFIX = "spring.mqtt.channel2";

}

4.连接管理

@Slf4j
@Component
public class MqttClientConnection {
   

    private MqttClient mqttClient;

    /**
     * 系统的mqtt客户端id
     */
    private String mqttClientId;


    /**
     * 客户端
     */
    public static ConcurrentHashMap<String, MqttClientConnection> mqttClients = new ConcurrentHashMap();
    /**
     * 客户端connect连接mqtt服务器
     *
     * @param userName     用户名
     * @param passWord     密码
     * @param mqttCallback 回调函数
     **/
    public MqttClient setMqttClient(String host, String clientId, String userName, String passWord, boolean cleanSession, MqttCallback mqttCallback) throws MqttException {
   
        MqttConnectOptions options = mqttConnectOptions(host, clientId, userName, passWord, cleanSession);
        if (mqttCallback == null) {
   
            mqttClient.setCallback(new MqttClientCallback(mqttClientId));
        } else {
   
            mqttClient.setCallback(mqttCallback