springboot整合mqtt向EMQX发送信息

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一 spingboot整合mqtt

原理：

 二 操作案例

2.1 工程结构

 2.2 配置pom文件

<dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.13</version>
      <scope>test</scope>
    </dependency>
    <!-- mqtt -->
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-integration</artifactId>
    </dependency>
    <dependency>
      <groupId>org.springframework.integration</groupId>
      <artifactId>spring-integration-stream</artifactId>
    </dependency>
    <dependency>
      <groupId>org.springframework.integration</groupId>
      <artifactId>spring-integration-mqtt</artifactId>
    </dependency>
    <!-- lombok -->
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <version>1.16.16</version>
    </dependency>
    <!-- springBoot的启动器 -->
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
      <version>2.0.1.RELEASE</version>
    </dependency>
  <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-web</artifactId>
    <version>5.1.5.RELEASE</version>
  </dependency>

 2.3 配置application配置文件

server:
  port: 8081
spring:
  mqtt:
    username: admin							# 账号
    password: public						# 密码
    host-url: tcp://172.16.71.150:1883					# mqtt连接tcp地址
    client-id: mq-dky-0813						# 客户端Id，每个启动的id要不同
    default-topic: mq-dky-guolu					# 默认主题
    timeout: 100							# 超时时间
    keepalive: 100

2.4 读取配置文件，初始客户端

package com.ljf.mqtt.demo.config;

import com.ljf.mqtt.demo.client.MqttPushClient;
import lombok.Getter;
import lombok.Setter;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Component;

/**
 * @ClassName: MqttConfig
 * @Description: TODO
 * @Author: liujianfu
 * @Date: 2021/08/16 14:43:39 
 * @Version: V1.0
 **/
@Component
@ConfigurationProperties("spring.mqtt")
@Setter
@Getter
public class MqttConfig {
    @Autowired
    private MqttPushClient mqttPushClient;

    /**
     * 用户名
     */
    private String username;
    /**
     * 密码
     */
    private String password;
    /**
     * 连接地址
     */
    private String hostUrl;
    /**
     * 客户Id
     */
    private String clientId;
    /**
     * 默认连接话题
     */
    private String defaultTopic;
    /**
     * 超时时间
     */
    private int timeout;
    /**
     * 保持连接数
     */
    private int keepalive;

    @Bean
    public MqttPushClient getMqttPushClient() {
        mqttPushClient.connect(hostUrl, clientId, username, password, timeout, keepalive);
        // 以/#结尾表示订阅所有以test开头的主题
        mqttPushClient.subscribe(defaultTopic, 0);
        return mqttPushClient;
    }
}

2.4 订阅推送客户端

package com.ljf.mqtt.demo.client;

import com.ljf.mqtt.demo.listener.PushCallback;
import org.eclipse.paho.client.mqttv3.*;
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;

/**
 * @ClassName: MqttPushClient
 * @Description: TODO
 * @Author: liujianfu
 * @Date: 2021/08/16 14:48:38 
 * @Version: V1.0
 **/
@Component
public class MqttPushClient {
    private static final Logger logger = LoggerFactory.getLogger(MqttPushClient.class);
    @Autowired
    private PushCallback pushCallback;

    private static MqttClient client;

    private static MqttClient getClient() {
        return client;
    }

    private static void setClient(MqttClient client) {
        MqttPushClient.client = client;
    }

    /**
     * 客户端连接
     *
     * @param host      ip+端口
     * @param clientID  客户端Id
     * @param username  用户名
     * @param password  密码
     * @param timeout   超时时间
     * @param keepalive 保留数
     */
    public void connect(String host, String clientID, String username, String password, int timeout, int keepalive) {
        MqttClient client;
        try {
            client = new MqttClient(host, clientID, new MemoryPersistence());
            MqttConnectOptions options = new MqttConnectOptions();
            options.setCleanSession(true);
            options.setUserName(username);
            options.setPassword(password.toCharArray());
            options.setConnectionTimeout(timeout);
            options.setKeepAliveInterval(keepalive);
            MqttPushClient.setClient(client);
            try {
                client.setCallback(pushCallback);
                client.connect(options);
            } catch (Exception e) {
                e.printStackTrace();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 发布
     *
     * @param qos         连接方式
     * @param retained    是否保留
     * @param topic       主题
     * @param pushMessage 消息体
     */
    public 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 = MqttPushClient.getClient().getTopic(topic);
        if (null == mTopic) {
            logger.error("topic not exist");
        }
        MqttDeliveryToken token;
        try {
            token = mTopic.publish(message);
            token.waitForCompletion();
        } catch (MqttPersistenceException e) {
            e.printStackTrace();
        } catch (MqttException e) {
            e.printStackTrace();
        }
    }

    /**
     * 订阅某个主题
     *
     * @param topic 主题
     * @param qos   连接方式
     */
    public void subscribe(String topic, int qos) {
        logger.info("==============开始订阅主题=========" + topic);
        try {
            MqttPushClient.getClient().subscribe(topic, qos);
        } catch (MqttException e) {
            e.printStackTrace();
        }
    }
}

2.5 定制监听订阅者

package com.ljf.mqtt.demo.listener;

import com.ljf.mqtt.demo.config.MqttConfig;
import org.eclipse.paho.client.mqttv3.IMqttDeliveryToken;
import org.eclipse.paho.client.mqttv3.MqttCallback;
import org.eclipse.paho.client.mqttv3.MqttClient;
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;

/**
 * @ClassName: PushCallback
 * @Description: TODO
 * @Author: liujianfu
 * @Date: 2021/08/16 14:52:20 
 * @Version: V1.0
 **/
@Component
public class PushCallback implements MqttCallback {
    private static final Logger logger = LoggerFactory.getLogger(PushCallback.class);
    @Autowired
    private MqttConfig mqttConfig;
    private static MqttClient client;
    @Override
    public void connectionLost(Throwable throwable) {
        // 连接丢失后，一般在这里面进行重连
        logger.info("连接断开，可以做重连");
        if (client == null || !client.isConnected()) {
            mqttConfig.getMqttPushClient();
        }
    }
    @Override
    public void messageArrived(String topic, MqttMessage mqttMessage) throws Exception {
        // subscribe后得到的消息会执行到这里面
        logger.info("接收消息主题 : " + topic);
        logger.info("接收消息Qos : " + mqttMessage.getQos());
        logger.info("接收消息内容 : " + new String(mqttMessage.getPayload()));
    }

    @Override
    public void deliveryComplete(IMqttDeliveryToken iMqttDeliveryToken) {
        logger.info("deliveryComplete---------" + iMqttDeliveryToken.isComplete());
    }
}

2.6 发布数据

package com.ljf.mqtt.demo.controller;

import com.ljf.mqtt.demo.client.MqttPushClient;
import com.ljf.mqtt.demo.utils.R;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @ClassName: PullController
 * @Description: TODO
 * @Author: liujianfu
 * @Date: 2021/08/16 14:56:18 
 * @Version: V1.0
 **/
@RestController
@RequestMapping("/")
public class PullController {
    @Autowired
    private MqttPushClient mqttPushClient;
    /**
    * @author liujianfu
    * @description    测试发布主题
    * @date 2021/8/16 15:04
    * @param []
    * @return RUtils
    */
    @GetMapping(value = "/publishTopic")
    public R publishTopic(String sendMessage) {
       System.out.println("message:"+sendMessage);
       sendMessage=sendMessage+" : {\\"name\\":\\"ljf\\",\\"age\\":345}";
        mqttPushClient.publish(0,false,"mq-dky-guolu",sendMessage);
        return R.ok("OK");
    }
}

2.7 发布数据

1.发布数据：

 2.订阅消费数据

 3.emqx页面

4.在页面进行模拟

连接

订阅

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