今天小编给大家分享一下SpringBoot如何实现MQTT消息发送和接收的相关知识点,内容详细,逻辑清晰,相信大部分人都还太了解这方面的知识,所以分享这篇文章给大家参考一下,希望大家阅读完这篇文章后有所收获,下面我们一起来了解一下吧。spr
今天小编给大家分享一下SpringBoot如何实现MQTT消息发送和接收的相关知识点,内容详细,逻辑清晰,相信大部分人都还太了解这方面的知识,所以分享这篇文章给大家参考一下,希望大家阅读完这篇文章后有所收获,下面我们一起来了解一下吧。
对于发布者:
消息通过消息网关发送出去,由 MessageChannel
的实例 DirectChannel
处理发送的细节。
DirectChannel
收到消息后,内部通过 MessageHandler
的实例 MQttPahoMessageHandler
发送到指定的 Topic。
对于订阅者:
通过注入 MessageProducerSupport
的实例 MqttPahoMessageDrivenChannelAdapter
,实现订阅 Topic 和绑定消息消费的 MessageChannel
。
同样由 MessageChannel
的实例 DirectChannel
处理消费细节。
Channel 消息后会发送给我们自定义的 MqttInboundMessageHandler
实例进行消费。
可以看到整个处理的流程和前面将的基本一致。Spring Integration 就是抽象出了这么一套消息通信的机制,具体的通信细节由它集成的中间件来决定。
<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-integration --><dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-integration</artifactId> <version>2.5.1</version></dependency> <!-- Https://mvnrepository.com/artifact/org.springframework.integration/spring-integration-stream --><dependency> <groupId>org.springframework.integration</groupId> <artifactId>spring-integration-stream</artifactId> <version>5.5.5</version></dependency><!-- https://mvnrepository.com/artifact/org.springframework.integration/spring-integration-mqtt --><dependency> <groupId>org.springframework.integration</groupId> <artifactId>spring-integration-mqtt</artifactId> <version>5.5.5</version></dependency>
#mqtt配置mqtt: username: 123 passWord: 123 #MQTT-服务器连接地址,如果有多个,用逗号隔开 url: tcp://127.0.0.1:1883 #MQTT-连接服务器默认客户端ID client: id: ${random.value} default: #MQTT-默认的消息推送主题,实际可在调用接口时指定 topic: topic,mqtt/test/# #连接超时 completionTimeout: 3000
import lombok.extern.slf4j.Slf4j;import org.eclipse.paho.client.mqttv3.MqttConnectOptions;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.beans.factory.annotation.Value;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.integration.annotation.IntegrationComponentScan;import org.springframework.integration.annotation.ServiceActivator;import org.springframework.integration.channel.DirectChannel;import org.springframework.integration.core.MessageProducer;import org.springframework.integration.mqtt.core.DefaultMqttPahoClientFactory;import org.springframework.integration.mqtt.core.MqttPahoClientFactory;import org.springframework.integration.mqtt.inbound.MqttPahoMessageDrivenChannelAdapter;import org.springframework.integration.mqtt.outbound.MqttPahoMessageHandler;import org.springframework.integration.mqtt.support.DefaultPahoMessageConverter;import org.springframework.messaging.Message;import org.springframework.messaging.MessageChannel;import org.springframework.messaging.MessageHandler;import org.springframework.messaging.MessagingException; import java.util.Arrays;import java.util.List; @Configuration@IntegrationComponentScan@Slf4jpublic class MqttSenderAndReceiveConfig { private static final byte[] WILL_DATA; static { WILL_DATA = "offline".getBytes(); } @Autowired private MqttReceiveHandle mqttReceiveHandle; @Value("${mqtt.username}") private String username; @Value("${mqtt.password}") private String password; @Value("${mqtt.url}") private String hostUrl; @Value("${mqtt.client.id}") private String clientId; @Value("${mqtt.default.topic}") private String defaultTopic; @Value("${mqtt.completionTimeout}") private int completionTimeout; //连接超时 @Bean(value = "getMqttConnectOptions") public MqttConnectOptions getMqttConnectOptions1() { MqttConnectOptions mqttConnectOptions = new MqttConnectOptions(); // 设置是否清空session,这里如果设置为false表示服务器会保留客户端的连接记录,这里设置为true表示每次连接到服务器都以新的身份连接 mqttConnectOptions.setCleanSession(true); // 设置超时时间 单位为秒 mqttConnectOptions.setConnectionTimeout(10); mqttConnectOptions.setAutomaticReconnect(true); mqttConnectOptions.setUserName(username); mqttConnectOptions.setPassword(password.toCharArray()); mqttConnectOptions.setServerURIs(new String[]{hostUrl}); // 设置会话心跳时间 单位为秒 服务器会每隔1.5*20秒的时间向客户端发送心跳判断客户端是否在线,但这个方法并没有重连的机制 mqttConnectOptions.seTKEepAliveInterval(10); // 设置“遗嘱”消息的话题,若客户端与服务器之间的连接意外中断,服务器将发布客户端的“遗嘱”消息。 //mqttConnectOptions.setWill("willTopic", WILL_DATA, 2, false); return mqttConnectOptions; } @Bean public MqttPahoClientFactory mqttClientFactory() { DefaultMqttPahoClientFactory factory = new DefaultMqttPahoClientFactory(); factory.setConnectionOptions(getMqttConnectOptions1()); return factory; } @Bean public MessageChannel mqttOutboundChannel() { return new DirectChannel(); } @Bean @ServiceActivator(inputChannel = "mqttOutboundChannel") public MessageHandler mqttOutbound() { MqttPahoMessageHandler messageHandler = new MqttPahoMessageHandler(clientId + "_producer", mqttClientFactory()); messageHandler.setAsync(true); messageHandler.setDefaultTopic(defaultTopic); messageHandler.setAsyncEvents(true); // 消息发送和传输完成会有异步的通知回调 //设置转换器 发送bytes数据 DefaultPahoMessageConverter converter = new DefaultPahoMessageConverter(); converter.setPayloadAsBytes(true); return messageHandler; } @Bean public MessageProducer inbound() { List<String> topicList = Arrays.asList(defaultTopic.trim().split(",")); String[] topics = new String[topicList.size()]; topicList.toArray(topics); MqttPahoMessageDrivenChannelAdapter adapter = new MqttPahoMessageDrivenChannelAdapter(clientId + "_consumer", mqttClientFactory(), topics); adapter.setCompletionTimeout(completionTimeout); DefaultPahoMessageConverter converter = new DefaultPahoMessageConverter(); converter.setPayloadAsBytes(true); adapter.setConverter(converter); adapter.setQos(2); adapter.setOutputChannel(mqttInputChannel()); return adapter; } @Bean public MessageChannel mqttInputChannel() { return new DirectChannel(); } @Bean @ServiceActivator(inputChannel = "mqttInputChannel") public MessageHandler handler() { return new MessageHandler() { @Override public void handleMessage(Message<?> message) throws MessagingException { //处理接收消息 mqttReceiveHandle.handle(message); } }; }}
@Slf4j@Componentpublic class MqttReceiveHandle { public void handle(Message<?> message) { log.info("收到订阅消息: {}", message); String topic = message.getHeaders().get(MqttHeaders.RECEIVED_TOPIC).toString(); log.info("消息主题:{}", topic); Object payLoad = message.getPayload(); byte[] data = (byte[]) payLoad; Packet packet = Packet.parse(data); log.info("发送的Packet数据{}", JSON.tojsONString(packet)); }}
import org.springframework.integration.annotation.MessagingGateway;import org.springframework.integration.mqtt.support.MqttHeaders;import org.springframework.messaging.handler.annotation.Header; @MessagingGateway(defaultRequestChannel = "mqttOutboundChannel")public interface MqttGateway { void sendToMqttObject(@Header(MqttHeaders.TOPIC) String topic, byte[] payload); void sendToMqtt(@Header(MqttHeaders.TOPIC) String topic, String payload); void sendToMqtt(@Header(MqttHeaders.TOPIC) String topic, @Header(MqttHeaders.QOS) int qos, String payload); void sendToMqtt(@Header(MqttHeaders.TOPIC) String topic, Object payload); void sendToMqtt(@Header(MqttHeaders.TOPIC) String topic, byte[] payload);}
import lombok.extern.slf4j.Slf4j;import org.springframework.context.event.EventListener;import org.springframework.integration.mqtt.event.MqttConnectionFailedEvent;import org.springframework.integration.mqtt.event.MqttMessageDeliveredEvent;import org.springframework.integration.mqtt.event.MqttMessageSentEvent;import org.springframework.integration.mqtt.event.MqttSubscribedEvent;import org.springframework.stereotype.Component; @Slf4j@Componentpublic class MqttListener { @EventListener(classes = MqttConnectionFailedEvent.class) public void listenerAction(MqttConnectionFailedEvent mqttConnectionFailedEvent) { log.info("连接失败的事件通知"); } @EventListener(classes = MqttMessageSentEvent.class) public void listenerAction(MqttMessageSentEvent mqttMessageSentEvent) { log.info("已发送的事件通知"); } @EventListener(classes = MqttMessageDeliveredEvent.class) public void listenerAction(MqttMessageDeliveredEvent mqttMessageDeliveredEvent) { log.info("已传输完成的事件通知"); } @EventListener(classes = MqttSubscribedEvent.class) public void listenerAction(MqttSubscribedEvent mqttSubscribedEvent) { log.info("消息订阅的事件通知"); }}
@Resource private MqttGateway mqttGateway; @RequestMapping(value = "/sendMqtt",method = RequestMethod.POST) public String sendMqtt(String sendData, String topic) { MqttMessage mqttMessage = new MqttMessage(); mqttGateway.sendToMqtt(topic, sendData); //mqttGateway.sendToMqttObject(topic, sendData.getBytes()); return "OK"; }
以上就是“SpringBoot如何实现MQTT消息发送和接收”这篇文章的所有内容,感谢各位的阅读!相信大家阅读完这篇文章都有很大的收获,小编每天都会为大家更新不同的知识,如果还想学习更多的知识,请关注编程网精选频道。
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