springbootmqtt收发消息
时间: 2023-11-16 16:54:02 浏览: 41
要在Spring Boot中使用MQTT收发消息,可以使用 Eclipse Paho MQTT 客户端库。以下是一个简单的示例:
1. 添加依赖
在 pom.xml 文件中添加以下依赖:
```xml
<dependency>
<groupId>org.eclipse.paho</groupId>
<artifactId>org.eclipse.paho.client.mqttv3</artifactId>
<version>1.2.5</version>
</dependency>
```
2. 配置连接参数
在 application.properties 文件中添加以下配置:
```properties
spring.mqtt.username=your-username
spring.mqtt.password=your-password
spring.mqtt.url=tcp://your-mqtt-server:1883
```
3. 发布消息
```java
@Autowired
private MqttPahoClientFactory mqttClientFactory;
public void publish(String topic, String payload) throws MqttException {
MqttMessage message = new MqttMessage(payload.getBytes());
message.setQos(1);
MqttPahoClient client = mqttClientFactory.createClient("clientId", null);
client.connect();
client.publish(topic, message);
client.disconnect();
}
```
4. 订阅消息
```java
@Autowired
private MqttPahoClientFactory mqttClientFactory;
@PostConstruct
public void subscribe() throws MqttException {
MqttPahoClient client = mqttClientFactory.createClient("clientId", null);
client.setCallback(new MqttCallback() {
@Override
public void connectionLost(Throwable cause) {
// 连接丢失时的处理逻辑
}
@Override
public void messageArrived(String topic, MqttMessage message) throws Exception {
// 收到消息时的处理逻辑
}
@Override
public void deliveryComplete(IMqttDeliveryToken token) {
// 消息发送完成后的处理逻辑
}
});
client.connect();
client.subscribe("your-topic");
}
```
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