SpringBoot2.x集成MQTT实现消息订阅(附源码)

MQTT协议因低延迟、效率高在工业物联网领域使用的频率特别高。前文介绍了如何用代码发送MQTT消息,本文在前文的基础上实现MQTT消息的订阅接收。
操作步骤:

  1. 引入相关的依赖
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-integration</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.integration</groupId>
<artifactId>spring-integration-mqtt</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
  1. 在application.yml配置MQTT服务器信息
server:
port: 8090
mqtt:
host: tcp://127.0.0.1:1883
clientinid: mqttinId
clientoutid: mqttoutid
topic: virus
qoslevel: 1
#MQTT 认证
username: xxx
password: xxx
timeout: 10000
#20s
keepalive: 20
  1. 配置MQTT消息推送配置
package com.favccxx.mqtt.config;
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.support.DefaultPahoMessageConverter;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.MessageHandler;
import org.springframework.messaging.MessagingException;
@Slf4j
@Configuration
@IntegrationComponentScan
public class MQTTReceiveConfig {
@Value("${mqtt.username}")
private String username;
@Value("${mqtt.password}")
private String password;
@Value("${mqtt.host}")
private String hostUrl;
@Value("${mqtt.clientinid}")
private String clientId;
@Value("${mqtt.topic}")
private String defaultTopic;
@Value("${mqtt.timeout}")
private int completionTimeout ;   //连接超时
@Bean
public MqttConnectOptions getReceiverMqttConnectOptions(){
MqttConnectOptions mqttConnectOptions=new MqttConnectOptions();
mqttConnectOptions.setCleanSession(true);
mqttConnectOptions.setConnectionTimeout(10);
mqttConnectOptions.setKeepAliveInterval(90);
mqttConnectOptions.setAutomaticReconnect(true);
mqttConnectOptions.setUserName(username);
mqttConnectOptions.setPassword(password.toCharArray());
mqttConnectOptions.setServerURIs(new String[]{hostUrl});
mqttConnectOptions.setKeepAliveInterval(2);
return mqttConnectOptions;
}
@Bean
public MqttPahoClientFactory mqttClientFactory() {
DefaultMqttPahoClientFactory factory = new DefaultMqttPahoClientFactory();
factory.setConnectionOptions(getReceiverMqttConnectOptions());
return factory;
}
//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", mqttClientFactory(),
defaultTopic);
adapter.setCompletionTimeout(completionTimeout);
adapter.setConverter(new DefaultPahoMessageConverter());
adapter.setQos(1);
adapter.setOutputChannel(mqttInputChannel());
return adapter;
}
//通过通道获取数据
@Bean
@ServiceActivator(inputChannel = "mqttInputChannel")
public MessageHandler handler() {
return new MessageHandler() {
@Override
public void handleMessage(Message<?> message) throws MessagingException {
log.info("主题:{},消息接收到的数据:{}", message.getHeaders().get("mqtt_receivedTopic"), message.getPayload());
}
};
}
}
  1. 启动服务,使用上一篇博文的消息接口发送消息。
    SpringBoot2.x集成MQTT实现消息订阅(附源码)

  2. 实时控制台会打印输出的消息

主题: virus, 消息接收到的数据: 战胜武汉肺炎