SpringBoot 集成 Mqtt

<!--mqttv3依赖-->
        <dependency>
            <groupId>org.eclipse.paho</groupId>
            <artifactId>org.eclipse.paho.client.mqttv3</artifactId>
            <version>1.2.2</version>
        </dependency>

MqttTool.java

package com.mingshine.navcloud.mqtt;

import org.eclipse.paho.client.mqttv3.MqttClient;
import org.eclipse.paho.client.mqttv3.MqttConnectOptions;
import org.eclipse.paho.client.mqttv3.MqttException;
import org.eclipse.paho.client.mqttv3.persist.MemoryPersistence;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import javax.annotation.PostConstruct;

@Component
public class MqttTool {
    Logger logger = LoggerFactory.getLogger(this.getClass());

    @Autowired
    private OnMessageCallback onMessageCallback;

    private final String HOST = "tcp://XXXXXXXX:1883"; //连接ip
    private final String TOPIC_CLOUD_DATA = "NAV-CLOUD";
    private final String TOPIC_SYS = "$SYS/brokers/+/clients/+/connected";
//    private final String TOPIC_SYS = "$SYS/brokers/+/clients/#";

    //    private final String[] TOPIC = new String[]{"NAV-CLOUD", "$SYS/brokers/+/clients/#", "$SYS/brokers/+/clients/+/connected", "$SYS/brokers/+/clients/+/disconnected"}; //订阅队列
    private final String mClientId = "NAV-CLOUD-SERVER-1";  //连接id，注意不要和已有的连接id重复

    private MqttClient mClient;
    private MqttConnectOptions mConnOpts;
    private String mUserName = "admin";
    private String mPassWord = "password";

    @PostConstruct
    public void init() {
        start();
    }

    private void start() {
        try {
            mClient = new MqttClient(HOST, mClientId, new MemoryPersistence());
            mConnOpts = new MqttConnectOptions();
            mConnOpts.setCleanSession(true); // 清空session
            mConnOpts.setConnectionTimeout(10);// 设置超时时间
            mConnOpts.setKeepAliveInterval(20);// 设置会话心跳时间
            mConnOpts.setUserName(mUserName);
            mConnOpts.setPassword(mPassWord.toCharArray());
            mClient.setCallback(onMessageCallback); // 设置回调函数
            mClient.connect(mConnOpts); // 创立连接
            mClient.subscribe(TOPIC_CLOUD_DATA, 0); // 订阅
//            mClient.subscribe(TOPIC_SYS, 1); // 订阅
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public void publish(String topic, byte[] payload) {
        try {
            this.mClient.publish(topic, payload, 1, false);
        } catch (MqttException e) {
            e.printStackTrace();
        }
    }

    public void close() {
        try {
            this.mClient.close();
        } catch (MqttException e) {
            e.printStackTrace();
        }
    }

    public void reConnect() throws Exception {
        if (this.mClient != null) {
            logger.info("开始重连");
            this.mClient.connect(this.mConnOpts);
            mClient.subscribe(TOPIC_CLOUD_DATA, 0); // 订阅
            mClient.subscribe(TOPIC_SYS, 1); // 订阅
        }
    }

}

OnMessageCallback.java

package com.mingshine.navcloud.mqtt;

import org.eclipse.paho.client.mqttv3.IMqttDeliveryToken;
import org.eclipse.paho.client.mqttv3.MqttCallback;
import org.eclipse.paho.client.mqttv3.MqttMessage;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

@Component
public class OnMessageCallback implements MqttCallback {
    public Logger logger = LoggerFactory.getLogger(this.getClass());

    @Autowired
    private MqttTool mMqttTool;

    public void connectionLost(Throwable cause) {
        // 连接丢失后，一般在这里面进行重连
        System.out.println("连接断开，可以做重连");
        while (true) {
            try {
                Thread.sleep(5000L);
                mMqttTool.reConnect();
                break;
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    public void messageArrived(String topic, MqttMessage message) {
        // subscribe后得到的消息会执行到这里面
        System.out.println("接收消息主题:" + topic);
        System.out.println("接收消息Qos:" + message.getQos());
        System.out.println("接收消息内容:" + new String(message.getPayload()));
//        String msg = new String(message.getPayload());
        JSONObject jsonObject = JSON.parseObject(msg);
        String clientId = String.valueOf(jsonObject.get("clientid"));
        if (topic.endsWith("disconnected")) {
            logger.info("客户端已掉线：{}", clientId);
        } else {
            logger.info("客户端已上线：{}", clientId);
        }

    }

    public void deliveryComplete(IMqttDeliveryToken token) {
        System.out.println("deliveryComplete---------" + token.isComplete());
    }


}

DeviceCloudController.java

package com.mingshine.navcloud.controller;

import com.mingshine.navcloud.base.BaseController;
import com.mingshine.navcloud.base.BaseResult;
import com.mingshine.navcloud.mqtt.MqttTool;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@CrossOrigin
@RestController
@RequestMapping("/device-cloud")
public class DeviceCloudController extends BaseController {

    @Autowired
    private MqttTool mMqttTool;

    @RequestMapping("/sendCmd2Device")
    public BaseResult<?> sendCmd2Device(String serialNum) {
        BaseResult<?> result = BaseResult.result();
        mMqttTool.publish(serialNum, "你好".getBytes());
        return result;
    }


}