springboot集成MQTT实现消息收发，断线重连

开始研究JAVA及MQTT，写下该文章方便使用参考

1、添加依赖  pom.xml

        <dependency>
            <groupId>org.springframework.integration</groupId>
            <artifactId>spring-integration-stream</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>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.35</version>
        </dependency>

2、mqtt配置  application.yml

# Spring配置
spring:
  # MQTT
  mqtt:
    # 服务器连接地址，如果有多个，用逗号隔开
    host: tcp://192.168.1.1:1883
    # 连接服务器默认客户端ID
    clientId: mqtt_jlsId_
    # 默认的消息推送主题，实际可在调用接口时指定
    topic: topic_a,topic_b,topic_c
    # 用户名
    username:
    # 密码
    password:
    # 连接超时
    timeout: 30
    # 心跳
    keepalive: 30

3、获取配置信息工具类

当然可以使用注解 @Value获取配置信息
这里是网上查的资料直接使用以下类来获取

package com.projuct.junlaishun.mqtt;

import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

/**
 * 获取配置信息
 **/
public class PropertiesUtil {

    public static String MQTT_HOST;
    public static String MQTT_CLIENT_ID;
    public static String MQTT_USER_NAME;
    public static String MQTT_PASSWORD;
    public static String MQTT_TOPIC;
    public static Integer MQTT_TIMEOUT;
    public static Integer MQTT_KEEP_ALIVE;

    /**
     *  mqtt配置
     */
    static {
        Properties properties = loadMqttProperties();
        MQTT_HOST = properties.getProperty("host");
        MQTT_CLIENT_ID = properties.getProperty("clientId")+Math.random();
        MQTT_USER_NAME = properties.getProperty("username");
        MQTT_PASSWORD = properties.getProperty("password");
        MQTT_TOPIC = properties.getProperty("topic");
        MQTT_TIMEOUT = Integer.valueOf(properties.getProperty("timeout"));
        MQTT_KEEP_ALIVE = Integer.valueOf(properties.getProperty("keepalive"));
    }

    private static Properties loadMqttProperties() {
        InputStream inputstream = PropertiesUtil.class.getResourceAsStream("/application.yml");
        Properties properties = new Properties();
        try {
            properties.load(inputstream);
            return properties;
        } catch (IOException e) {
            throw new RuntimeException(e);
        } finally {
            try {
                if (inputstream != null) {
                    inputstream.close();
                }
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }
    }
}

4、MQTT客户端  MqttConsumer类

package com.projuct.junlaishun.mqtt;

import org.eclipse.paho.client.mqttv3.*;
import org.eclipse.paho.client.mqttv3.persist.MemoryPersistence;
import org.springframework.boot.ApplicationArguments;
import org.springframework.boot.ApplicationRunner;
import org.springframework.stereotype.Component;


@Component
public class MqttConsumer implements ApplicationRunner {

    private static MqttClient client;

    @Override
    public void run(ApplicationArguments args) {
        System.out.println("初始化并启动mqtt......");
        this.connect();
    }

    /**
     * 连接mqtt服务器
     */
    private void connect() {
        try {
            // 1 创建客户端
            getClient();
            // 2 设置配置
            MqttConnectOptions options = getOptions();
            String[] topic = PropertiesUtil.MQTT_TOPIC.split(",");
            // 3 消息发布质量
            int[] qos = getQos(topic.length);
            // 4 最后设置
            create(options, topic, qos);
        } catch (Exception e) {
            System.out.println("mqtt连接异常：" + e);
        }
    }

    /**
     *  创建客户端  --- 1 ---
     */
    public void getClient() {
        try {
            if (null == client) {
                client = new MqttClient(PropertiesUtil.MQTT_HOST, PropertiesUtil.MQTT_CLIENT_ID, new MemoryPersistence());
            }

            System.out.println("创建mqtt客户端：" );
        } catch (Exception e) {
            System.out.println("创建mqtt客户端异常：\" + e：" );
        }
    }

    /**
     *  生成配置对象，用户名，密码等  --- 2 ---
     */
    public MqttConnectOptions getOptions() {
        MqttConnectOptions options = new MqttConnectOptions();
        options.setUserName(PropertiesUtil.MQTT_USER_NAME);
        options.setPassword(PropertiesUtil.MQTT_PASSWORD.toCharArray());
        // 设置超时时间
        options.setConnectionTimeout(PropertiesUtil.MQTT_TIMEOUT);
        // 设置会话心跳时间
        options.setKeepAliveInterval(PropertiesUtil.MQTT_KEEP_ALIVE);
        // 是否清除session
        options.setCleanSession(false);
        System.out.println("--生成mqtt配置对象");
        return options;
    }

    /**
     *  qos   --- 3 ---
     */
    public int[] getQos(int length) {

        int[] qos = new int[length];
        for (int i = 0; i < length; i++) {
            /**
             *  MQTT协议中有三种消息发布服务质量:
             *
             * QOS0： “至多一次”，消息发布完全依赖底层 TCP/IP 网络。会发生消息丢失或重复。这一级别可用于如下情况，环境传感器数据，丢失一次读记录无所谓，因为不久后还会有第二次发送。
             * QOS1： “至少一次”，确保消息到达，但消息重复可能会发生。
             * QOS2： “只有一次”，确保消息到达一次。这一级别可用于如下情况，在计费系统中，消息重复或丢失会导致不正确的结果，资源开销大
             */
            qos[i] = 1;
        }
        System.out.println("--设置消息发布质量");
        return qos;
    }

    /**
     *  装载各种实例和订阅主题  --- 4 ---
     */
    public void create(MqttConnectOptions options, String[] topic, int[] qos) {
        try {
            client.setCallback(new MqttConsumerCallback(client, options, topic, qos));
            System.out.println("--添加回调处理类");
            client.connect(options);
        } catch (Exception e) {
            System.out.println("装载实例或订阅主题异常：" + e);
        }
    }
    /**
     * 订阅某个主题
     *
     * @param topic
     * @param qos
     */
    public static void subscribe(String topic, int qos) {
        try {
            System.out.println("topic:" + topic);
            client.subscribe(topic, qos);
        } catch (MqttException e) {
            e.printStackTrace();
        }
    }

    /**
     * 发布，非持久化
     *
     *  qos根据文档设置为1
     *
     * @param topic
     * @param msg
     */
    public static void publish(String topic, String msg) {
        publish(1, false, topic, msg);
    }

    /**
     * 发布
     */
    public static void publish(int qos, boolean retained, String topic, String pushMessage) {
        MqttMessage message = new MqttMessage();
        message.setQos(qos);
        message.setRetained(retained);
        message.setPayload(pushMessage.getBytes());
        MqttTopic mTopic = client.getTopic(topic);
        if (null == mTopic) {
            System.out.println("topic：" + topic + " 不存在");
        }
        MqttDeliveryToken token;
        try {
            token = mTopic.publish(message);
            token.waitForCompletion();

            if (!token.isComplete()) {
                System.out.println("消息发送成功");
            }
        } catch (MqttPersistenceException e) {
            e.printStackTrace();
        } catch (MqttException e) {
            e.printStackTrace();
        }
    }
}

5、mqtt回调处理类

package com.projuct.junlaishun.mqtt;

import org.eclipse.paho.client.mqttv3.*;

import java.util.Arrays;

/**
 * mqtt回调处理类
 */

public class MqttConsumerCallback implements MqttCallbackExtended {

    private MqttClient client;
    private MqttConnectOptions options;
    private String[] topic;
    private int[] qos;

    public MqttConsumerCallback(MqttClient client, MqttConnectOptions options, String[] topic, int[] qos) {
        this.client = client;
        this.options = options;
        this.topic = topic;
        this.qos = qos;
    }

    /**
     * 断开重连
     */
    @Override
    public void connectionLost(Throwable cause) {
        System.out.println("MQTT连接断开，发起重连......");
        try {
            if (null != client && !client.isConnected()) {
                client.reconnect();
                System.out.println("尝试重新连接");
            } else {
                client.connect(options);
                System.out.println("尝试建立新连接");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 接收到消息调用令牌中调用
     */
    @Override
    public void deliveryComplete(IMqttDeliveryToken token) {
        System.out.println("deliveryComplete---------" + Arrays.toString(topic));
    }

    /**
     * 消息处理
     */
    @Override
    public void messageArrived(String topic, MqttMessage message) {
        try {
            String msg = new String(message.getPayload());
            System.out.println("收到topic:" + topic + " 消息：" + msg);
            System.out.println("收到消息后执行具体的业务逻辑操作，比如将消息存储进数据库");
        } catch (Exception e) {
            System.out.println("处理mqtt消息异常:" + e);
        }
    }

    /**
     * mqtt连接后订阅主题
     */
    @Override
    public void connectComplete(boolean b, String s) {
        try {
            if (null != topic && null != qos) {
                if (client.isConnected()) {
                    client.subscribe(topic, qos);
                    System.out.println("mqtt连接成功，客户端ID：" + PropertiesUtil.MQTT_CLIENT_ID);
                    System.out.println("--订阅主题:：" + Arrays.toString(topic));
                } else {
                    System.out.println("mqtt连接失败，客户端ID：" + PropertiesUtil.MQTT_CLIENT_ID);
                }
            }
        } catch (Exception e) {
            System.out.println("mqtt订阅主题异常:" + e);
        }
    }
}　　

 

6、编写测试方法MqttController

package com.projuct.junlaishun.mqtt;


import com.alibaba.fastjson.JSONObject;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/mqtt")
public class MqttController {
    /**
     * 推送消息
     */
    @ResponseBody
    //@GetMapping(value = "/push")
    @RequestMapping("sendMqttMessage")
    public JSONObject push(String topic,
                       String message) {
        MqttConsumer.publish(topic, message);
        JSONObject res = new JSONObject();
        res.put("code",0);
        res.put("msg","测试发布主题成功");
        return res;
    }
}

　测试记录截图