Spring Boot整合EMQX（MQTT协议）主要涉及到以下几个步骤：
- 引入Spring Boot的MQTT依赖。
- 配置MQTT连接参数。
- 创建MQTT消息监听器。
- 发送和接收MQTT消息。
以下是一个简单的例子：
- 添加依赖到你的
pom.xml：
<dependency>
<groupId>org.springframework.integration</groupId>
<artifactId>spring-integration-mqtt</artifactId>
<version>5.5.1</version>
</dependency>
- 在
application.properties中配置MQTT连接参数：
spring.mqtt.username=admin
spring.mqtt.password=public
spring.mqtt.url=tcp://localhost:1883
spring.mqtt.client.id=clientId
spring.mqtt.default.topic=testTopic
- 创建MQTT配置类：
@Configuration
public class MqttConfig {
@Value("${spring.mqtt.username}")
private String username;
@Value("${spring.mqtt.password}")
private String password;
@Value("${spring.mqtt.url}")
private String url;
@Value("${spring.mqtt.client.id}")
private String clientId;
@Value("${spring.mqtt.default.topic}")
private String defaultTopic;
@Bean
public MqttPahoClientFactory mqttClientFactory() {
DefaultMqttPahoClientFactory factory = new DefaultMqttPahoClientFactory();
MqttConnectOptions options = new MqttConnectOptions();
options.setServerURIs(new String[]{url});
options.setUserName(username);
options.setPassword(password.toCharArray());
factory.setConnectionOptions(options);
return factory;
}
@Bean
public MessageChannel mqttInputChannel() {
return new DirectChannel();
}
@Bean
public MessageProducer inbound() {
MqttPahoMessageDrivenChannelAdapter adapter =
new MqttPahoMessageDrivenChannelAdapter(clientId, mqttClientFactory(), defaultTopic);
adapter.setQos(1);
adapter.setOutputChannel(mqttInputChannel());
return adapter;
}
}
- 创建监听器来接收消息：
@Component
public class MqttReceiver {
@Autowired
private SimpMessagingTemplate simpMessagingTemplate;
@JmsListener(destination = "testTopic")
public void receiveMessage(String payload) {
System.out.println("Received Message: " + payload);
// 可以进行进一步处理，并通过SimpMessagingTemplate转发消息等。
}
}
- 发送消息的方法：
@Autowired
private MqttPahoClientFactory mqttClientFactory;
@Autowired
private MessageChannel mqttOutboundChannel;
public void sendMessage(S