SpringBoot整合emqtt

待我称王封你为后i 2021-09-29 03:44 400阅读 0赞

### SpringBoot整合emqtt ###

*  一、emqtt安装
 *  二、相关配置
 *   *   *  1. 在pom文件下添加以下maven依赖：
         *  2. 在yml文件中进行mqtt的连接配置
 *  三、springboot-emqtt的整合
 *   *   *  1. 获取配置
         *  2. mqtt推送客户端
         *  3. 消费监听类
         *  4. 测试服务
 *  三、测试成果

# 一、emqtt安装 #

使用rpm安装emqtt并进行简单的测试：以下是在虚拟机centos7下安装的emqtt。  
https://blog.csdn.net/lxw983520/article/details/89442373

# 二、相关配置 #

### 1. 在pom文件下添加以下maven依赖： ###

<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>

### 2. 在yml文件中进行mqtt的连接配置 ###

spring:
       mqtt:
        username: admin							# 账号
        password: public						# 密码
        host-url: tcp://ip:1883					# mqtt连接tcp地址
        client-id: test							# 客户端Id，每个启动的id要不同
        default-topic: test						# 默认主题
        timeout: 100							# 超时时间
        keepalive: 100							# 保持连接数

# 三、springboot-emqtt的整合 #

### 1. 获取配置 ###

package com.modules.common.mqtt;
    
    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 MtqqEntity
     * @Description mqtt相关配置信息
     * @Date 2019/4/11 23:00
     * @Created by Jack
     */
    @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("test/#", 0);
            return mqttPushClient;
        }
    }

### 2. mqtt推送客户端 ###

package com.modules.common.mqtt;
    
    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;
    
    import javax.annotation.PostConstruct;
    
    /**
     * @Classname MqttPushClient
     * @Description mqtt推送客户端
     * @Date 2019/4/11 23:22
     * @Created by Jack
     */
    @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();
            }
        }
    }

### 3. 消费监听类 ###

package com.modules.common.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.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Component;
    
    /**
     * @Classname PushCallback
     * @Description 消费监听类
     * @Date 2019/4/11 23:31
     * @Created by Jack
     */
    @Component
    public class PushCallback implements MqttCallback {
        private static final Logger logger = LoggerFactory.getLogger(MqttPushClient.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());
        }
    }

### 4. 测试服务 ###

package com.test.controller;
    
    import com.modules.common.exception.ExceptionUtils;
    import com.modules.common.mqtt.MqttPushClient;
    import com.modules.common.utils.RUtils;
    import com.modules.common.validator.ValidatorUtils;
    import com.test.entity.TestUser;
    import com.test.form.TestForm;
    import com.test.service.TestService;
    import io.swagger.annotations.Api;
    import io.swagger.annotations.ApiImplicitParam;
    import io.swagger.annotations.ApiImplicitParams;
    import io.swagger.annotations.ApiOperation;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.web.bind.annotation.*;
    
    import javax.validation.Valid;
    
    /**
     * @author: lxw
     * @Date: 2018/10/19 19:36
     * @email: 1229703575@qq.com
     * @Description: 测试文件
     */
    @RestController
    @RequestMapping("/")
    @Api("测试")
    public class TestController {
     
        @Autowired
        private MqttPushClient mqttPushClient;
    
        @ApiOperation(value = "发布主题", notes = "测试发布主题")
        @GetMapping(value = "/publishTopic")
        public RUtils publishTopic() {
            mqttPushClient.publish(0,false,"test/test","测试一下发布消息");
            return RUtils.ok();
        }
    }

# 三、测试成果 #

1.  进入后台订阅`“test/test”`主题，**注意要进行连接**。  
    ![连接][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2x4dzk4MzUyMA_size_16_color_FFFFFF_t_70]
2.  接口发送相关信息。  
    ![发送信息][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2x4dzk4MzUyMA_size_16_color_FFFFFF_t_70 1]
3.  后台接收到相应的信息。  
    ![接收消息][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2x4dzk4MzUyMA_size_16_color_FFFFFF_t_70 2]  
    此时项目中的客户端也订阅了`test/`下的主题，因此也会收到相应的消息。  
    ![获取数据][20190822222620152.png]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2x4dzk4MzUyMA_size_16_color_FFFFFF_t_70]: /images/20210923/ef35f9a2cb1e476498cd9cbcf85550bc.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2x4dzk4MzUyMA_size_16_color_FFFFFF_t_70 1]: /images/20210923/1e4ffc60cdfc4a9fa6092f859046c590.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2x4dzk4MzUyMA_size_16_color_FFFFFF_t_70 2]: /images/20210923/22eb54324ed24e528ba324e5d494d029.png
[20190822222620152.png]: /images/20210923/ad21d99c35f44ca9bd304dd47c5162f6.png