springboot怎么整合mqtt

Spring Boot可以通过使用Eclipse Paho客户端库来整合MQTT。以下是整合步骤：

1. 添加依赖

在pom.xml文件中添加以下依赖：

<dependency>
    <groupId>org.eclipse.paho</groupId>
    <artifactId>org.eclipse.paho.client.mqttv3</artifactId>
    <version>1.2.5</version>
</dependency>

2. 配置MQTT连接

在application.properties文件中添加以下配置：

spring.mqtt.username=your-username
spring.mqtt.password=your-password
spring.mqtt.url=tcp://your-mqtt-server:1883

3. 创建MQTT客户端

使用以下代码创建MQTT客户端：

@Configuration
public class MqttConfig {

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

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

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

    @Bean
    public MqttClient mqttClient() throws MqttException {
        MqttConnectOptions options = new MqttConnectOptions();
        options.setUserName(userName);
        options.setPassword(password.toCharArray());
        MqttClient mqttClient = new MqttClient(brokerUrl, MqttClient.generateClientId());
        mqttClient.connect(options);
        return mqttClient;
    }
}

4. 发布和订阅MQTT消息

使用以下代码发布和订阅MQTT消息：

@Autowired
private MqttClient mqttClient;

public void publish(String topic, String message) throws MqttException {
    MqttMessage mqttMessage = new MqttMessage(message.getBytes());
    mqttClient.publish(topic, mqttMessage);
}

public void subscribe(String topic) throws MqttException {
    mqttClient.subscribe(topic, (topic1, message) -> {
        String payload = new String(message.getPayload());
        System.out.println("Received message: " + payload);
    });
}

以上就是整合Spring Boot和MQTT的步骤。