spring boot集成mqtt协议发送和订阅数据

maven的pom.xml引入包

        <!--mqtt--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-integration</artifactId><version>2.3.6.RELEASE</version></dependency><dependency><groupId>org.springframework.integration</groupId><artifactId>spring-integration-stream</artifactId><version>5.3.4.RELEASE</version></dependency><dependency><groupId>org.springframework.integration</groupId><artifactId>spring-integration-mqtt</artifactId><version>5.3.4.RELEASE</version></dependency>

mqtt.yml配置文件

spring:mqtt:username: adminpassword: beyond_2021url: tcp://192.168.3.100:1883client-id: data-clientIdserver-id: data-serverIddata-topic: data/#will-topic: data-willwill-content: data server offlinecompletion-timeout: 10000

初始化MQTT配置bean

package com.beyond.config;import org.eclipse.paho.client.mqttv3.MqttConnectOptions;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.event.EventListener;
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.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.integration.mqtt.inbound.MqttPahoMessageDrivenChannelAdapter;
import org.springframework.integration.mqtt.outbound.MqttPahoMessageHandler;
import org.springframework.integration.mqtt.support.DefaultPahoMessageConverter;
import org.springframework.integration.mqtt.support.MqttHeaders;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.MessageHandler;
import org.springframework.messaging.MessagingException;import java.security.SecureRandom;
import java.util.Date;@Configuration
@IntegrationComponentScan
public class MqttConfig {private static final Logger log = LoggerFactory.getLogger(MqttConfig.class);@Value("${spring.mqtt.username}")private String username;@Value("${spring.mqtt.password}")private String password;@Value("${spring.mqtt.url}")private String hostUrl;@Value("${spring.mqtt.client-id}")private String clientId;@Value("${spring.mqtt.server-id}")private String serverId;@Value("${spring.mqtt.data-topic:data/#}")private String dataTopic;@Value("${spring.mqtt.will-topic}")private String willTopic;@Value("${spring.mqtt.will-content}")private String willContent;/*** @desc 连接超时*/@Value("${spring.mqtt.completion-timeout}")private int completionTimeout ;@Beanpublic MqttConnectOptions getMqttConnectOptions(){// MQTT的连接设置MqttConnectOptions mqttConnectOptions = new MqttConnectOptions();// 设置连接的用户名mqttConnectOptions.setUserName(username);// 设置连接的密码mqttConnectOptions.setPassword(password.toCharArray());// 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，// 把配置里的 cleanSession 设为false，客户端掉线后 服务器端不会清除session，// 当重连后可以接收之前订阅主题的消息。当客户端上线后会接受到它离线的这段时间的消息mqttConnectOptions.setCleanSession(true);// 设置发布端地址,多个用逗号分隔, 如:tcp://111:1883,tcp://222:1883// 当第一个111连接上后,222不会在连,如果111挂掉后,重试连111几次失败后,会自动去连接222mqttConnectOptions.setServerURIs(hostUrl.split(","));// 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个消息判断客户端是否在线，但这个方法并没有重连的机制mqttConnectOptions.setKeepAliveInterval(20);mqttConnectOptions.setAutomaticReconnect(true);// 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, willContent.getBytes(), 2, false);mqttConnectOptions.setMaxInflight(1000000);return mqttConnectOptions;}@Beanpublic MqttPahoClientFactory mqttClientFactory() {DefaultMqttPahoClientFactory factory = new DefaultMqttPahoClientFactory();factory.setConnectionOptions(getMqttConnectOptions());return factory;}/*** @desc 发送通道配置 默认主题* @date 2021/3/16*/@Bean@ServiceActivator(inputChannel = "mqttOutboundChannel")public MessageHandler mqttOutbound() {//clientId每个连接必须唯一,否则,两个相同的clientId相互挤掉线String clientIdStr = clientId + new SecureRandom().nextInt(10);MqttPahoMessageHandler messageHandler = new MqttPahoMessageHandler(clientIdStr, mqttClientFactory());//async如果为true，则调用方不会阻塞。而是在发送消息时等待传递确认。默认值为false（发送将阻塞，直到确认发送)messageHandler.setAsync(true);messageHandler.setAsyncEvents(true);messageHandler.setDefaultTopic(dataTopic);messageHandler.setDefaultQos(1);return messageHandler;}/*** @desc 发送通道* @date 2021/3/16*/@Beanpublic MessageChannel mqttOutboundChannel() {return new DirectChannel();}/*** @desc 接收通道* @date 2021/3/16*/@Beanpublic MessageChannel mqttInputChannel() {return new DirectChannel();}/*** @desc 配置监听的 topic 支持通配符* @date 2021/3/16*/@Beanpublic MessageProducer inbound() {//clientId每个连接必须唯一,否则,两个相同的clientId相互挤掉线String serverIdStr = serverId + new SecureRandom().nextInt(10);MqttPahoMessageDrivenChannelAdapter adapter =new MqttPahoMessageDrivenChannelAdapter(serverIdStr, mqttClientFactory(), dataTopic);adapter.setCompletionTimeout(completionTimeout);adapter.setConverter(new DefaultPahoMessageConverter());adapter.setQos(1);adapter.setOutputChannel(mqttInputChannel());return adapter;}/*** @desc 通过通道获取数据 订阅的数据* @date 2021/3/16*/@Bean@ServiceActivator(inputChannel = "mqttInputChannel")public MessageHandler handler() {return new MessageHandler() {@Overridepublic void handleMessage(Message<?> message) throws MessagingException {String payload = message.getPayload().toString();String topic = message.getHeaders().get(MqttHeaders.RECEIVED_TOPIC).toString();//处理订阅topic:(data/#)到的所有的数据}};}/*** @desc mqtt连接失败或者订阅失败时,触发MqttConnectionFailedEvent事件* @date 2021/7/22*@param event* @return void*/@EventListener(MqttConnectionFailedEvent.class)public void mqttConnectionFailedEvent(MqttConnectionFailedEvent event) {log.error("mqttConnectionFailedEvent连接mqtt失败: " +"date={}, hostUrl={}, username={}, error={}",new Date(), hostUrl, username, event.getCause().getMessage());}/*** @desc 当async和async事件(async-events)都为true时,将发出MqttMessageSentEvent* 它包含消息、主题、客户端库生成的消息id、clientId和clientInstance（每次连接客户端时递增）* @date 2021/7/22*@param event* @return void*/@EventListener(MqttMessageSentEvent.class)public void mqttMessageSentEvent(MqttMessageSentEvent event) {log.info("mqttMessageSentEvent发送信息: date={}, info={}", new Date(), event.toString());}/*** @desc 当async和async事件(async-events)都为true时,将发出MqttMessageDeliveredEvent* 当客户端库确认传递时，将发出MqttMessageDeliveredEvent。它包含messageId、clientId和clientInstance，使传递与发送相关。* @date 2021/7/22*@param event* @return void*/@EventListener(MqttMessageDeliveredEvent.class)public void mqttMessageDeliveredEvent(MqttMessageDeliveredEvent event) {log.info("mqttMessageDeliveredEvent发送成功信息: date={}, info={}", new Date(), event.toString());}/*** @desc 成功订阅到主题，MqttSubscribedEvent事件就会被触发(多个主题,多次触发)* @date 2021/7/22*@param event* @return void*/@EventListener(MqttSubscribedEvent.class)public void mqttSubscribedEvent(MqttSubscribedEvent event) {log.info("mqttSubscribedEvent订阅成功信息: date={}, info={}", new Date(), event.toString());}}

mqtt发送数据网关配置

package com.beyond.data.component;import org.springframework.integration.annotation.MessagingGateway;
import org.springframework.integration.mqtt.support.MqttHeaders;
import org.springframework.messaging.handler.annotation.Header;
import org.springframework.stereotype.Component;/*** @desc MQTT发送网关* @date 2021/3/12*/
@Component
@MessagingGateway(defaultRequestChannel = "mqttOutboundChannel")
public interface MqttGatewayComponent {void sendToMqtt(String data);void sendToMqtt(String payload, @Header(MqttHeaders.TOPIC) String topic);void sendToMqtt(@Header(MqttHeaders.TOPIC) String topic, @Header(MqttHeaders.QOS) int qos, String payload);}

发送数据到mqtt伪代码

@Autowired
private MqttGatewayComponent mqttGatewayComponent;//发送字符串或json字符串,到指定的topic
mqttGatewayComponent.sendToMqtt("json string", "data/abcd");

参考链接:
https://blog.csdn.net/sinat_21184471/article/details/87186186
https://blog.csdn.net/qq_29467891/article/details/107043225?utm_source=app
https://blog.csdn.net/myinsert/article/details/107715538