springboot集成MQTT协议实现消息实时推送（未实现版）

        
            org.springframework.integration
            spring-integration-mqtt
        
        
            org.eclipse.paho
            org.eclipse.paho.client.mqttv3
            1.2.0
        

# Mqtt配置
mqtt:
  serverURIs: tcp://localhost:1883
  username: admin
  password: public
  client:
    id: ${random.value}
  topic: topic_default

import lombok.Getter;
import lombok.Setter;
import lombok.extern.slf4j.Slf4j;
import org.eclipse.paho.client.mqttv3.MqttConnectOptions;
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 javax.annotation.PostConstruct;
import java.util.Arrays;
import java.util.List;
import java.util.Objects;

@Slf4j
@Configuration
@IntegrationComponentScan
@Getter
@Setter
public class MqttConfig {

    public static final String OUTBOUND_CHANNEL = "mqttOutboundChannel";

    public static final String INPUT_CHANNEL = "mqttInputChannel";

    public static final String SUB_TOPICS = "PSimulation,Pressure,PSimulationPump,PSimulationPressure," +
            "PSimulationValve,PSimulationFlow,FSimulation,FSimulationPump,FSimulationPressure," +
            "FSimulationValve,FSimulationFlow,leak,blast";

    @Value("${mqtt.username}")
    private String username;

    @Value("${mqtt.password}")
    private String password;

    @Value("${mqtt.serverURIs}")
    private String hostUrl;

    @Value("${mqtt.client.id}")
    private String clientId;

    @Value("${mqtt.topic}")
    private String defaultTopic;

    @PostConstruct
    public void init() {
        log.debug("username:{} password:{} hostUrl:{} clientId :{} ",
                this.username, this.password, this.hostUrl, this.clientId, this.defaultTopic);
    }

    @Bean
    public MqttPahoClientFactory clientFactory() {

        final MqttConnectOptions options = new MqttConnectOptions();
        options.setServerURIs(new String[]{hostUrl});
        options.setUserName(username);
        options.setPassword(password.toCharArray());
        final DefaultMqttPahoClientFactory factory = new DefaultMqttPahoClientFactory();
        factory.setConnectionOptions(options);
        return factory;
    }

    @Bean(value = OUTBOUND_CHANNEL)
    public MessageChannel mqttOutboundChannel() {
        return new DirectChannel();
    }

    @Bean
    @ServiceActivator(inputChannel = OUTBOUND_CHANNEL)
    public MessageHandler mqttOutbound() {

        final MqttPahoMessageHandler handler = new MqttPahoMessageHandler(clientId, clientFactory());
        handler.setDefaultQos(1);
        handler.setDefaultRetained(false);
        handler.setDefaultTopic(defaultTopic);
        handler.setAsync(false);
        handler.setAsyncEvents(false);
        return handler;
    }

    /**
     * MQTT消息接收处理
     */
    //接收通道
    @Bean
    public MessageChannel mqttInputChannel() {
        return new DirectChannel();
    }

    //配置client,监听的topic
    @Bean
    public MessageProducer inbound() {
        MqttPahoMessageDrivenChannelAdapter adapter =
                new MqttPahoMessageDrivenChannelAdapter(
                        clientId + "_inbound", clientFactory(), SUB_TOPICS.split(","));
        adapter.setCompletionTimeout(3000);
        adapter.setConverter(new DefaultPahoMessageConverter());
        adapter.setQos(1);
        adapter.setOutputChannel(mqttInputChannel());
        return adapter;
    }

    //通过通道获取数据
    @Bean
    @ServiceActivator(inputChannel = INPUT_CHANNEL)
    public MessageHandler handler() {
        return message -> {
            String topic = Objects.requireNonNull(message.getHeaders().get("mqtt_receivedTopic")).toString();
            log.info("topic: {}", topic);
            String[] topics = SUB_TOPICS.split(",");
            for (String t : topics) {
                if (t.equals(topic)) {
                    log.info("payload: {}", message.getPayload().toString());
                }
            }
        };
    }

}

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
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.support.DefaultPahoMessageConverter;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.MessageHandler;
import org.springframework.messaging.MessagingException;

@Configuration
public class IotMqttSubscriberConfig {

    @Autowired
    private MqttConfig mqttConfig;

    @Bean
    public MqttPahoClientFactory mqttClientFactory() {
        DefaultMqttPahoClientFactory factory = new DefaultMqttPahoClientFactory();
        factory.setServerURIs(mqttConfig.getHostUrl());
        return factory;
    }

    @Bean
    public MessageChannel iotMqttInputChannel() {
        return new DirectChannel();
    }

    @Bean
    public MessageProducer inbound() {
        MqttPahoMessageDrivenChannelAdapter adapter = new MqttPahoMessageDrivenChannelAdapter(mqttConfig.getClientId(), mqttClientFactory(), mqttConfig.getDefaultTopic());
        adapter.setCompletionTimeout(5000);
        adapter.setConverter(new DefaultPahoMessageConverter());
        adapter.setQos(1);
        adapter.setOutputChannel(iotMqttInputChannel());
        return adapter;
    }

    /**
     * @author xiaofu
     * @description 消息订阅
     * @date 2020/6/8 18:20
     */
    @Bean
    @ServiceActivator(inputChannel = "iotMqttInputChannel")
    public MessageHandler handlerTest() {

        return message -> {
            try {
                String string = message.getPayload().toString();
                System.out.println("接收到消息：" + string);
            } catch (MessagingException ex) {
                //logger.info(ex.getMessage());
            }
        };
    }
}

import org.springframework.integration.annotation.MessagingGateway;
import org.springframework.integration.mqtt.support.MqttHeaders;
import org.springframework.messaging.handler.annotation.Header;

@MessagingGateway(defaultRequestChannel = "iotMqttInputChannel")
public interface IotMqttGateway {

    // 向默认的 topic 发送消息
    void sendMessage2Mqtt(String payload);
    // 向指定的 topic 发送消息
    void sendMessage2Mqtt(String payload,@Header(MqttHeaders.TOPIC) String topic);
    // 向指定的 topic 发送消息，并指定服务质量参数
    void sendMessage2Mqtt(@Header(MqttHeaders.TOPIC) String topic, @Header(MqttHeaders.QOS) int qos, String payload);
}

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.integration.annotation.ServiceActivator;
import org.springframework.integration.channel.DirectChannel;
import org.springframework.integration.mqtt.core.DefaultMqttPahoClientFactory;
import org.springframework.integration.mqtt.core.MqttPahoClientFactory;
import org.springframework.integration.mqtt.outbound.MqttPahoMessageHandler;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.MessageHandler;

@Configuration
public class IotMqttProducerConfig {

    @Autowired
    private MqttConfig mqttConfig;

    @Bean
    public MqttPahoClientFactory mqttClientFactory() {
        DefaultMqttPahoClientFactory factory = new DefaultMqttPahoClientFactory();
        factory.setServerURIs(mqttConfig.getHostUrl());
        return factory;
    }

    @Bean
    public MessageChannel mqttOutboundChannel() {
        return new DirectChannel();
    }

    @Bean
    @ServiceActivator(inputChannel = "iotMqttInputChannel")
    public MessageHandler mqttOutbound() {
        MqttPahoMessageHandler messageHandler = new MqttPahoMessageHandler(mqttConfig.getClientId(), mqttClientFactory());
        messageHandler.setAsync(false);
        messageHandler.setDefaultTopic(mqttConfig.getDefaultTopic());
        return messageHandler;
    }
}

@PostMapping("/send")
    @ApiOperation(value = "发送消息到指定主题")
    public String send(String message,String topic) {
        // 发送消息到指定主题
        mqttGateway.sendMessage2Mqtt(topic, 1, message);
        return "send topic: " + topic+ ", message : " + message;
    }

EMQX下载：https://www.emqx.io/zh
EMQX登录界面：http://localhost:18083/
参考文章：https://mp.weixin.qq.com/s?__biz=MzAxNTM4NzAyNg==&mid=2247486353&idx=1&sn=02371acc8048cb15f29285f0505c4958&chksm=9b859b6cacf2127a2799d28830dc6ef0560764d4d29b5d3c742dd7489d66365691c662e70ce6&token=632378703&lang=zh_CN#rd；
https://blog.csdn.net/f4233441/article/details/121829743
对EMQX使用不熟练，未实现相应功能。