Springboot集成mqtt客户端详解-Java开发

MQTT是一个基于客户端-服务器的消息发布/订阅传输协议。MQTT协议是轻量、简单、开放和易于实现的，这些特点使它适用范围非常广泛。本文为大家分享了Springboot整合mqtt服务的示例代码，需要的可以参考一下

1. 前言

这里我们使用springboot搭建一个轻量级的mqtt客户端，连接mqtt的Broker服务。

连接信息写在配置文件里application.properties

spring.mqtt.username=admin
spring.mqtt.mqpassword=admin
spring.mqtt.host-url= tcp://127.0.0.1:1883
spring.mqtt.client-id= server_client_${random.value}
spring.mqtt.default-topic= $SYS/brokers/+/clients/#
spring.mqtt.completionTimeout= 3000
spring.mqtt.keepAlive= 60

2. 引入依赖

       <!--mqtt -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-integration</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.integration</groupId>
            <artifactId>spring-integration-stream</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.integration</groupId>
            <artifactId>spring-integration-mqtt</artifactId>
        </dependency>

3. 配置文件

新建MqttProperties.java文件，初始化application里的mqtt配置项

@ConfigurationProperties("spring.mqtt")
@Component
@Getter
@Setter
public class MqttProperties {
    private String username;
    private String mqpassword;
    private String hostUrl;
    private String clientId;
    private String defaultTopic;
    private String completionTimeout;
    private Integer keepAlive;
}

新建MqttConfiguration.java文件，为mqtt做初始化配置

@Configuration
@Slf4j
public class MqttConfiguration {
    @Autowired
    private MqttProperties mqttProperties;
    /**
     * 事件触发
     */
    @Autowired
    private ApplicationEventPublisher eventPublisher;
    @Bean
    public MqttConnectOptions getMqttConnectOptions(){
        MqttConnectOptions mqttConnectOptions=new MqttConnectOptions();
        mqttConnectOptions.setUserName(mqttProperties.getUsername());
        mqttConnectOptions.setPassword(mqttProperties.getMqpassword().toCharArray());
        mqttConnectOptions.setServerURIs(new String[]{mqttProperties.getHostUrl()});
        mqttConnectOptions.setKeepAliveInterval(2);
        mqttConnectOptions.setKeepAliveInterval(mqttProperties.getKeepAlive());
        return mqttConnectOptions;
    }
    @Bean
    public MqttPahoClientFactory mqttClientFactory() {
        DefaultMqttPahoClientFactory factory = new DefaultMqttPahoClientFactory();
        factory.setConnectionOptions(getMqttConnectOptions());
        return factory;
    }
    @Bean
    public MessageChannel mqttInputChannel() {
        return new DirectChannel();
    }
    /**
     * 配置client,监听的topic
     */
    @Bean
    public MessageProducer inbound() {
        MqttPahoMessageDrivenChannelAdapter adapter =
                new MqttPahoMessageDrivenChannelAdapter(mqttProperties.getClientId()+"_inbound", mqttClientFactory(),
                        mqttProperties.getDefaultTopic().split(","));
        adapter.setCompletionTimeout(Long.valueOf(mqttProperties.getCompletionTimeout()));
        adapter.setConverter(new DefaultPahoMessageConverter());
        //默认添加TopicName中所有tipic
        adapter.addTopic("+/+/test");
        adapter.setQos(2);
        adapter.setOutputChannel(mqttInputChannel());
        return adapter;
    }
    @Bean
    @ServiceActivator(inputChannel = "mqttInputChannel")
    public MessageHandler handler() {
        return new MessageHandler() {
            @Override
            public void handleMessage(Message<?> message) throws MessagingException {
                String topic = message.getHeaders().get("mqtt_receivedTopic").toString();
                String qos = message.getHeaders().get("mqtt_receivedQos").toString();
                //触发事件 这里不再做业务处理，包 listener中做处理
                eventPublisher.publishEvent(new MqttEvent(this,topic,message.getPayload().toString()));
            }
        };
    }
    /**
     * 发送消息和消费消息Channel可以使用相同MqttPahoClientFactory
     *
     * @return
     */
    @Bean
    @ServiceActivator(inputChannel = "mqttOutboundChannel")
    public MessageHandler mqttOutbound() {
        // 在这里进行mqttOutboundChannel的相关设置
        MqttPahoMessageHandler messageHandler =  new MqttPahoMessageHandler(mqttProperties.getClientId(), mqttClientFactory());
        // 如果设置成true，发送消息时将不会阻塞。
        messageHandler.setAsync(true);
        messageHandler.setDefaultTopic(mqttProperties.getDefaultTopic());
        return messageHandler;
    }
    @Bean
    public MessageChannel mqttOutboundChannel() {
        return new DirectChannel();
    }
}

4. MQTT消息类

新建MqttEvent.java 消息类。用于发送mqtt的消息

@Getter
public class MqttEvent extends ApplicationEvent {
    private String topic;
    /**
     * 发送的消息
     */
    private String message;
    public MqttEvent(Object source,String topic,String message) {
        super(source);
        this.topic = topic;
        this.message = message;
    }
}

5. MQTT消息接收器

新建JobListener.java文件作为 mqtt的消息接收类

@Slf4j
@Component
public class JobListener {
    @Autowired
    DeviceDao deviceDao;
    /**
     * 监听topic
     * @param mqttEvent
     */
    @EventListener(condition = "#mqttEvent.topic.startsWith('pay')")
    public void onEmqttCall1(MqttEvent mqttEvent) throws Exception {
        String topic = mqttEvent.getTopic();
		//写逻辑处理
    }
    /**
     * 监听topic
     * @param mqttEvent
     */
    @EventListener(condition = "#mqttEvent.topic.equals('device')")
    public void onEmqttCallT(MqttEvent mqttEvent){
        log.info("接收到消11111111111："+mqttEvent.getMessage());
    }
}

6. MQTT消息发送器

新建MqttGateway.java 提供发送mqttt消息的接口服务

@Component
@MessagingGateway(defaultRequestChannel = "mqttOutboundChannel")
public interface MqttGateway {
    void sendToMqtt(String data);
    void sendToMqtt(@Header(MqttHeaders.TOPIC) String topic, String payload);
    void sendToMqtt(@Header(MqttHeaders.TOPIC) String topic, @Header(MqttHeaders.QOS) int qos, String payload);
}

7. 测试MQTT发送消息

@SpringBootTest
public class Test3 {
    @Autowired
    MqttGateway mqttGateway;
    @Test
    public void mqttTest () {
      mqttGateway.sendToMqtt("111//222/33","消息内容");
    }
}

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