springboot订阅mqtt消息
时间: 2023-07-09 13:46:41 浏览: 56
要在Spring Boot应用程序中订阅MQTT消息,可以使用Eclipse Paho MQTT客户端库。以下是一些步骤:
1. 添加Maven依赖项:
```xml
<dependency>
<groupId>org.eclipse.paho</groupId>
<artifactId>org.eclipse.paho.client.mqttv3</artifactId>
<version>1.2.5</version>
</dependency>
```
2. 创建MQTT客户端并连接到MQTT代理:
```java
MqttClient client = new MqttClient(brokerUrl, clientId);
client.connect();
```
3. 订阅主题:
```java
client.subscribe(topic);
```
4. 编写消息处理程序:
```java
client.setCallback(new MqttCallback() {
@Override
public void connectionLost(Throwable cause) {}
@Override
public void messageArrived(String topic, MqttMessage message) throws Exception {
// 处理接收到的消息
}
@Override
public void deliveryComplete(IMqttDeliveryToken token) {}
});
```
5. 在应用程序启动时启动客户端:
```java
@SpringBootApplication
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
MqttClient client = new MqttClient(brokerUrl, clientId);
client.connect();
client.subscribe(topic);
}
}
```
这样,在应用程序启动后,您的应用程序将开始接收MQTT消息。