springboot整合mqtt客户端示例分享

package com.example.demo.config;

import lombok.extern.slf4j.Slf4j;
import org.eclipse.paho.client.mqttv3.*;
import org.eclipse.paho.client.mqttv3.persist.MemoryPersistence;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Configuration;

import javax.annotation.PostConstruct;

/**
 * @Author: xct
 * @Date: 2021/7/30 17:06
 * @Description:
 */
@Configuration
public class MqttConsumerConfig {
    @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.default.topic}")
    private String defaultTopic;

    /**
     * 客户端对象
     */
    private MqttClient client;

    /**
     * 在bean初始化后连接到服务器
     * @author xct
     * @param
     * @return void
     * @date 2021/7/30 16:48
     */
    @PostConstruct
    public void init(){
        connect();
    }

    /**
     * 客户端连接服务端
     * @author xct
     * @param
     * @return void
     * @date 2021/7/30 16:01
     */
    public void connect(){
        try {
            //创建MQTT客户端对象
            client = new MqttClient(hostUrl,clientId,new MemoryPersistence());
            //连接设置
            MqttConnectOptions options = new MqttConnectOptions();
            //是否清空session，设置为false表示服务器会保留客户端的连接记录，客户端重连之后能获取到服务器在客户端断开连接期间推送的消息
            //设置为true表示每次连接到服务端都是以新的身份
            options.setCleanSession(true);
            //设置连接用户名
            options.setUserName(username);
            //设置连接密码
            options.setPassword(password.toCharArray());
            //设置超时时间，单位为秒
            options.setConnectionTimeout(100);
            //设置心跳时间 单位为秒，表示服务器每隔1.5*20秒的时间向客户端发送心跳判断客户端是否在线
            options.setKeepAliveInterval(20);
            //设置遗嘱消息的话题，若客户端和服务器之间的连接意外断开，服务器将发布客户端的遗嘱信息
            options.setWill("willTopic",(clientId + "与服务器断开连接").getBytes(),0,false);
            //设置回调
            client.setCallback(new MqttConsumerCallBack());
            client.connect(options);
            //订阅主题
            //消息等级，和主题数组一一对应，服务端将按照指定等级给订阅了主题的客户端推送消息
            int[] qos = {1,1};
            //主题
            String[] topics = {"topic1","topic2"};
            //订阅主题
            client.subscribe(topics,qos);
        } catch (MqttException e) {
            e.printStackTrace();
        }
    }

    /**
     * 断开连接
     * @author xct
     * @param
     * @return void
     * @date 2021/8/2 09:30
     */
    public void disConnect(){
        try {
            client.disconnect();
        } catch (MqttException e) {
            e.printStackTrace();
        }
    }


    /**
     * 订阅主题
     * @author xct
     * @param topic
     * @param qos
     * @return void
     * @date 2021/7/30 17:12
     */
    public void subscribe(String topic,int qos){
        try {
            client.subscribe(topic,qos);
        } catch (MqttException e) {
            e.printStackTrace();
        }
    }
}

package com.example.demo.config;

import org.eclipse.paho.client.mqttv3.IMqttDeliveryToken;
import org.eclipse.paho.client.mqttv3.MqttCallback;
import org.eclipse.paho.client.mqttv3.MqttMessage;

/**
 * @Author: xct
 * @Date: 2021/7/30 17:06
 * @Description:
 */
public class MqttConsumerCallBack implements MqttCallback {
    /**
     * 客户端断开连接的回调
     * @author xct
     * @param throwable
     * @return void
     * @date 2021/7/30 17:14
     */
    @Override
    public void connectionLost(Throwable throwable) {
        System.out.println("与服务器断开连接，可重连");
    }

    /**
     * 消息到达的回调
     * @author xct
     * @param topic
     * @param message
     * @return void
     * @date 2021/7/30 17:14
     */
    @Override
    public void messageArrived(String topic, MqttMessage message) throws Exception {
        System.out.println(String.format("接收消息主题 : %s",topic));
        System.out.println(String.format("接收消息Qos : %d",message.getQos()));
        System.out.println(String.format("接收消息内容 : %s",new String(message.getPayload())));
        System.out.println(String.format("接收消息retained : %b",message.isRetained()));
        //TODO 可以将消息持久化到数据库中，然后在进行其他操作。
    }

    /**
     * 消息发布成功的回调
     * @author xct
     * @param iMqttDeliveryToken
     * @return void
     * @date 2021/7/30 17:14
     */
    @Override
    public void deliveryComplete(IMqttDeliveryToken iMqttDeliveryToken) {

    }
}

package com.example.demo.controller;


import com.example.demo.config.MqttConsumerConfig;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

/**
 * @Author: xct
 * @Date: 2021/7/30 17:20
 * @Description:
 */
@Controller
public class TestController {
    @Autowired
    private MqttConsumerConfig client;

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

    @RequestMapping("connect")
    @ResponseBody
    public String connect(){
        client.connect();
        return clientId + "连接到服务器";
    }

    @RequestMapping("disConnect")
    @ResponseBody
    public String disConnect(){
        client.disConnect();
        return clientId + "与服务器断开连接";
    }
}

spring:
  application:
    name: consumer
#MQTT配置信息
  mqtt:
#MQTT服务端地址，端口默认为1883，如果有多个，用逗号隔开，如tcp://127.0.0.1:1883,tcp://192.168.60.133:1883
    url: tcp://0.0.0.0:1883
#用户名
    username: admin
#密码
    password: public
#客户端id（不能重复）
    client:
      id: consumer-id
#MQTT默认的消息推送主题，实际可在调用接口时指定
    default:
      topic: topic
server:
   port: 8082