SpringBoot整合MQTT( EMQ)

1.下载EMQ安装包，配置EMQ环境

下载地址：https://www.emqx.cn/downloads#broker

下载压缩包解压，cmd进入bin文件夹

输入  emqx start 启动服务，打卡浏览器输入本地ip:18083  进入登录页面   默认用户名密码 admin/public

2.配置application.properties文件，设置EMQ参数，添加pom引入jar包

#MQTT Config
  mqtt:
  #MQTT-服务器连接地址，如果有多个，用逗号隔开，如：tcp://127.0.0.1:61613，tcp://192.168.2.133:61613
    host: tcp://127.0.0.1:11883
    #MQTT-连接服务器默认客户端ID
    clientid: mqtt_id
    #MQTT-用户名
    username: admin
    #MQTT-密码
    password: admin
    #MQTT-默认的消息推送主题，实际可在调用接口时指定
    topic: test
    #连接超时
    timeout: 1000
    #设置会话心跳时间
    keepalive: 100

<!-- mqtt -->
<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.springframework.boot</groupId>
   <artifactId>spring-boot-starter-integration</artifactId>
</dependency>

<dependency>
   <groupId>org.projectlombok</groupId>
   <artifactId>lombok</artifactId>
   <version>1.18.4</version>
</dependency>

3.创建工具类

1.配置文件

package com.st.modules.pump.mqtt;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.stereotype.Component;

@Component
@Configuration
@ConfigurationProperties(MqttConfiguration.PREFIX)
public class MqttConfiguration {

    @Autowired
    private MqttPushClient mqttPushClient;


    public static final  String PREFIX="mqtt";
    private String host;
    private String clientid;
    private String username;
    private String password;
    private String topic;
    private int timeout;
    private int keepalive;

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

    public String getHost() {
        return host;
    }

    public void setHost(String host) {
        this.host = host;
    }

    public String getClientid() {
        return clientid;
    }

    public void setClientid(String clientid) {
        this.clientid = clientid;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getTopic() {
        return topic;
    }

    public void setTopic(String topic) {
        this.topic = topic;
    }

    public int getTimeout() {
        return timeout;
    }

    public void setTimeout(int timeout) {
        this.timeout = timeout;
    }

    public int getKeepalive() {
        return keepalive;
    }

    public void setKeepalive(int keepalive) {
        this.keepalive = keepalive;
    }
}

2.发布者

package com.st.modules.pump.mqtt;

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.Autowired;
import org.springframework.stereotype.Component;

@Slf4j
@Component
public class MqttPushClient {

    @Autowired
    private PushCallback pushCallback;


    private static MqttClient client;

    public  static MqttClient getClient(){
        return  client;
    }

    public 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 keeplive 保留数
     */
    public void connect(String host,String clientID,String username,String password,int timeout,int keeplive){
        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(keeplive);
            MqttPushClient.setClient(client);
            try {
                client.setCallback(pushCallback);
                client.connect(options);
            }catch (Exception e){
                e.printStackTrace();
            }
        }catch (Exception e){
            e.printStackTrace();
        }

    }

    /**
     * 发布，默认qos为0，非持久化
     * @param topic
     * @param pushMessage
     */

    public void pushlish(String topic,String pushMessage){
        pushlish(0,false,topic,pushMessage);
    }

    /**
     * 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 pushlish(int qos,boolean retained,String topic,String pushMessage){
        MqttMessage message=new MqttMessage();
        message.setQos(qos);
        message.setRetained(retained);
        message.setPayload(pushMessage.getBytes());
        MqttTopic mqttTopic=MqttPushClient.getClient().getTopic(topic);
        if(null== mqttTopic){
            log.error("topic not exist");
        }
        MqttDeliveryToken token;
        try {
            token=mqttTopic.publish(message);
            token.waitForCompletion();
        }catch (MqttPersistenceException e){
            e.printStackTrace();
        }catch (MqttException e){
            e.printStackTrace();
        }

    }

    /**
     * 订阅某个主题，qos默认为0
     * @param topic
     */
    public void subscribe(String topic){
        log.error("开始订阅主题" + topic);
        subscribe(topic,0);
    }


    public void subscribe(String topic,int qos){
        try {
            MqttPushClient.getClient().subscribe(topic,qos);
        }catch (MqttException e){
            e.printStackTrace();
        }
    }
}

3.消费监听类

package com.st.modules.pump.mqtt;

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.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

/**
 * @Classname PushCallback
 * @Description 消费监听类
 */
@Component
public class PushCallback implements MqttCallback {
    @Autowired
    private MqttConfiguration mqttConfiguration;

    private static MqttClient client;

    @Override
    public void connectionLost(Throwable throwable) {if (client == null || !client.isConnected()) {
            System.out.println("连接断开，正在重连....");
            mqttConfiguration.getMqttPushClient();
        }
    }

    @Override
    public void messageArrived(String topic, MqttMessage message) throws Exception {
        
        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()));
    }

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

~~~~~~~~~~~~~Over~~~~~~~~~~~~~~