Springboot对接mqtt

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#人工智能 #spring #开发语言

在Spring Boot中对接MQTT协议，可以使用Eclipse Paho客户端和Spring Integration MQTT模块。以下是详细实现步骤：

1. 添加依赖

xml

<dependencies>  <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter</artifactId> </dependency>  <dependency> <groupId>org.springframework.integration</groupId> <artifactId>spring-integration-mqtt</artifactId> </dependency>  <dependency> <groupId>org.eclipse.paho</groupId> <artifactId>org.eclipse.paho.client.mqttv3</artifactId> <version>1.2.5</version> </dependency> </dependencies>

2. 配置MQTT连接参数

yaml

# application.yml mqtt: broker-url: tcp://localhost:1883 username: admin password: password client-id: spring-boot-client default-topic: test/topic timeout: 30 keepalive: 60 completion-timeout: 30000

3. MQTT配置类

scss

@Configuration @EnableConfigurationProperties(MqttProperties.class) public class MqttConfig { @Autowired private MqttProperties mqttProperties; // MQTT连接配置 @Bean public MqttConnectOptions mqttConnectOptions() { MqttConnectOptions options = new MqttConnectOptions(); options.setServerURIs(new String[]{mqttProperties.getBrokerUrl()}); options.setUserName(mqttProperties.getUsername()); options.setPassword(mqttProperties.getPassword().toCharArray()); options.setConnectionTimeout(mqttProperties.getTimeout()); options.setKeepAliveInterval(mqttProperties.getKeepalive()); options.setAutomaticReconnect(true); options.setCleanSession(true); return options; } // MQTT客户端工厂 @Bean public MqttPahoClientFactory mqttClientFactory() { DefaultMqttPahoClientFactory factory = new DefaultMqttPahoClientFactory(); factory.setConnectionOptions(mqttConnectOptions()); return factory; } // 出站消息通道（用于发送消息） @Bean @ServiceActivator(inputChannel = "mqttOutboundChannel") public MessageHandler mqttOutbound() { MqttPahoMessageHandler messageHandler = new MqttPahoMessageHandler(mqttProperties.getClientId() + "-producer", mqttClientFactory()); messageHandler.setAsync(true); messageHandler.setDefaultTopic(mqttProperties.getDefaultTopic()); return messageHandler; } // 出站通道 @Bean public MessageChannel mqttOutboundChannel() { return new DirectChannel(); } // 入站消息适配器（用于接收消息） @Bean public MessageProducer inbound() { MqttPahoMessageDrivenChannelAdapter adapter = new MqttPahoMessageDrivenChannelAdapter(mqttProperties.getClientId() + "-consumer", mqttClientFactory(), mqttProperties.getDefaultTopic()); adapter.setCompletionTimeout(mqttProperties.getCompletionTimeout()); adapter.setConverter(new DefaultPahoMessageConverter()); adapter.setQos(1); adapter.setOutputChannel(mqttInboundChannel()); return adapter; } // 入站通道 @Bean public MessageChannel mqttInboundChannel() { return new DirectChannel(); } // 入站消息处理器 @Bean @ServiceActivator(inputChannel = "mqttInboundChannel") public MessageHandler handler() { return new MessageHandler() { @Override public void handleMessage(Message<?> message) throws MessagingException { String topic = (String) message.getHeaders().get("mqtt_receivedTopic"); String payload = (String) message.getPayload(); System.out.println("Received message from topic: " + topic + ", payload: " + payload); // 处理接收到的消息 processMessage(topic, payload); } }; } }

4. 配置属性类

less

@ConfigurationProperties(prefix = "mqtt") @Component @Data public class MqttProperties { private String brokerUrl; private String username; private String password; private String clientId; private String defaultTopic; private int timeout; private int keepalive; private int completionTimeout; }

5. MQTT服务类

typescript

@Service public class MqttService { @Autowired private MessageChannel mqttOutboundChannel; // 发送消息到指定主题 public void sendMessage(String topic, String message) { mqttOutboundChannel.send(MessageBuilder.withPayload(message) .setHeader("mqtt_topic", topic) .build()); } // 发送消息到默认主题 public void sendMessage(String message) { mqttOutboundChannel.send(MessageBuilder.withPayload(message).build()); } // 发送带QoS的消息 public void sendMessage(String topic, String message, int qos) { mqttOutboundChannel.send(MessageBuilder.withPayload(message) .setHeader("mqtt_topic", topic) .setHeader("mqtt_qos", qos) .build()); } }

6. 消息处理器

typescript

@Component public class MqttMessageProcessor { private static final Logger logger = LoggerFactory.getLogger(MqttMessageProcessor.class); public void processMessage(String topic, String payload) { logger.info("Processing MQTT message - Topic: {}, Payload: {}", topic, payload); // 根据不同的主题进行不同的处理 switch (topic) { case "test/topic": handleTestTopic(payload); break; case "sensor/data": handleSensorData(payload); break; default: handleDefaultMessage(topic, payload); } } private void handleTestTopic(String payload) { logger.info("处理测试主题消息: {}", payload); // 具体的业务逻辑 } private void handleSensorData(String payload) { logger.info("处理传感器数据: {}", payload); try { // 解析JSON数据等操作 // ObjectMapper mapper = new ObjectMapper(); // SensorData data = mapper.readValue(payload, SensorData.class); } catch (Exception e) { logger.error("解析传感器数据失败", e); } } private void handleDefaultMessage(String topic, String payload) { logger.info("处理默认消息 - Topic: {}, Payload: {}", topic, payload); } }

7. 控制器示例

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@RestController @RequestMapping("/mqtt") public class MqttController { @Autowired private MqttService mqttService; @PostMapping("/publish") public ResponseEntity<String> publishMessage(@RequestParam String topic, @RequestParam String message) { try { mqttService.sendMessage(topic, message); return ResponseEntity.ok("Message published successfully"); } catch (Exception e) { return ResponseEntity.status(500).body("Failed to publish message: " + e.getMessage()); } } @PostMapping("/publish/default") public ResponseEntity<String> publishToDefaultTopic(@RequestParam String message) { try { mqttService.sendMessage(message); return ResponseEntity.ok("Message published to default topic"); } catch (Exception e) { return ResponseEntity.status(500).body("Failed to publish message: " + e.getMessage()); } } }

8. 主应用类

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@SpringBootApplication @EnableConfigurationProperties public class MqttApplication { public static void main(String[] args) { SpringApplication.run(MqttApplication.class, args); } }