springboot项目如何使用mqtt
时间: 2023-10-13 18:20:20 浏览: 43
在Spring Boot项目中使用MQTT,您需要执行以下步骤:
1. 在pom.xml文件中添加以下依赖:
```
<dependency>
<groupId>org.springframework.integration</groupId>
<artifactId>spring-integration-mqtt</artifactId>
<version>5.5.0</version>
</dependency>
```
2. 创建一个MQTT连接工厂bean
```
@Bean
public MqttPahoClientFactory mqttClientFactory() {
DefaultMqttPahoClientFactory factory = new DefaultMqttPahoClientFactory();
factory.setServerURIs("tcp://localhost:1883");
factory.setUserName("username");
factory.setPassword("password");
return factory;
}
```
3. 创建一个订阅通道
```
@Bean
public MessageChannel mqttInputChannel() {
return new DirectChannel();
}
```
4. 添加一个MQTT消息适配器
```
@Bean
public MessageProducer inbound() {
MqttPahoMessageDrivenChannelAdapter adapter =
new MqttPahoMessageDrivenChannelAdapter("clientId", mqttClientFactory(), "topic");
adapter.setCompletionTimeout(5000);
adapter.setConverter(new DefaultPahoMessageConverter());
adapter.setQos(1);
adapter.setOutputChannel(mqttInputChannel());
return adapter;
}
```
5. 创建一个处理程序bean,用于处理接收到的消息
```
@ServiceActivator(inputChannel = "mqttInputChannel")
public void handleMessage(String message) {
System.out.println("Received message: " + message);
// Do something with the message
}
```
6. 启动项目并使用MQTT发布消息
```
MqttMessage message = new MqttMessage("hello".getBytes());
message.setQos(1);
mqttClient.publish("topic", message);
```
这样,在接收到MQTT消息时,处理程序bean将处理该消息。