【EMQX实践】0到1实现EMQX客户端组件

在当今快速发展的物联网(IoT)时代，设备间的即时通信变得至关重要。Spring Boot以其简化配置和快速部署的特性，成为构建企业级应用的首选框架。Vert.x作为一个响应式应用平台，以其轻量级和高性能的特点，为构建高并发的分布式系统提供了强大支持。结合EMQ X Broker，我们能够实现一个基于Spring Boot和Vert.x的MQTT客户端，它将为微服务架构下的设备通信提供高效、可靠的解决方案。通过本实现指南，我们将一步步引导开发者如何从零开始构建这一组件，探索其在现代应用开发中的无限可能。

技术框架

为什么选择SpringBoot及 Vert.x 作为组件主要技术框架？
我想当我们聊到Java项目实践时候，往往离不开Spring及SpringBoot 框架：

Spring Boot简化了基于Spring的应用开发过程，自动配置和微服务支持使其成为快速开发和部署微服务的理想选择。
Spring Boot拥有庞大的社区和丰富的生态系统，提供了大量的库和工具，方便开发者快速解决问题和扩展功能。
Spring Boot的应用结构清晰，易于理解和维护。
Spring Boot可以轻松地扩展应用，无论是水平扩展还是垂直扩展。

Vert.x它的核心是一个轻量级的、多语言的、响应式的应用程序运行时，专为构建响应式、高性能、可伸缩的应用程序而设计。

Vert.x提供了一个事件驱动的非阻塞编程模型，非常适合处理大量并发连接，这对于需要高吞吐量和低延迟的MQTT通信至关重要。
Vert.x都拥有庞大的社区和丰富的生态系统，提供了大量的库和工具，方便开发者快速解决问题和扩展功能。
Vert.x的模块化设计也有助于保持代码的整洁和可维护性。
Vert.x可以轻松地扩展应用，无论是水平扩展还是垂直扩展。

当Spring Boot遇上Vert.x，它们的结合带来了更多的可能性：

Spring Boot和Vert.x可以很好地集成，Spring Boot提供了Vert.x的集成支持，使得在Spring Boot应用中使用Vert.x变得简单。
Vert.x的高性能特性，结合Spring Boot的轻量级特性，可以构建出既快速又高效的应用。

创建项目

源码地址Gitee
工具：idea、maven
环境：jdk17

创建项目步骤

选择创建新项目：在启动界面，点击“Create New Project”（创建新项目）。
选择 Maven：在左侧的项目类型列表中，选择“Maven”。
配置 JDK：确保 Maven 项目使用的 JDK 版本与你的 Maven 配置匹配。你可以通过点击右侧的“JDK”下拉菜单来选择。
添加 Maven 架构：如果你需要特定的 Maven 架构，可以在右侧的“Add Archetype”（添加架构）部分搜索并选择一个架构，例如 maven-archetype-quickstart。
填写项目信息：在右侧的表单中，填写项目的基本设置，包括：
- Group Id（组 ID）：通常是一个反向域名形式的标识符，如 com.gitee.xmhzzz.
- Artifact Id（构件 ID）：项目的唯一名称，如 emqx-practice.
- Version（版本）：项目的版本号，如 1.0.0-SNAPSHOT.
- Package（包）：项目的根包名，通常是组 ID 的全小写形式。

创建模块

选择创建新项目：在启动界面，点击“New Module”（创建项目的模块）。
选择 Maven：在左侧的项目类型列表中，选择“Maven”。
配置 JDK： “JDK”选择JDK17以上。
添加 Maven 架构：如果你需要特定的 Maven 架构，可以在右侧的“Add Archetype”（添加架构）部分搜索并选择一个架构，例如 maven-archetype-quickstart。
添加Parent: emqx-practice.
填写项目信息：在右侧的表单中，填写项目的基本设置，包括：
- Group Id（组 ID）：通常是一个反向域名形式的标识符，如 com.gitee.xmhzzz.
- Artifact Id（构件 ID）：项目的唯一名称，如 emqx-client.
- Version（版本）：项目的版本号，如 1.0.0-SNAPSHOT.
- Package（包）：项目的根包名，通常是组 ID 的全小写形式。

创建三个模块emqx-client、emqx-client-starter、emqx-example-service

maven依赖

parent项目emqx-practice

maven依赖

<dependencyManagement>
  <dependencies>

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-dependencies</artifactId>
      <version>${spring-boot.version}</version>
      <type>pom</type>
      <scope>import</scope>
    </dependency>

    <dependency>
      <groupId>io.vertx</groupId>
      <artifactId>vertx-stack-depchain</artifactId>
      <version>${vertx.version}</version>
      <type>pom</type>
      <scope>import</scope>
    </dependency>

    <dependency>
      <groupId>com.alibaba.fastjson2</groupId>
      <artifactId>fastjson2</artifactId>
      <version>${fastjson2.version}</version>
    </dependency>

    <dependency>
      <groupId>com.squareup.okhttp3</groupId>
      <artifactId>okhttp</artifactId>
      <version>${okhttp.version}</version>
    </dependency>

    <dependency>
      <groupId>com.google.guava</groupId>
      <artifactId>guava</artifactId>
      <version>${guava.version}</version>
    </dependency>

    <dependency>
      <groupId>cn.hutool</groupId>
      <artifactId>hutool-all</artifactId>
      <version>${hutool.version}</version>
    </dependency>

    <dependency>
      <groupId>org.apache.commons</groupId>
      <artifactId>commons-lang3</artifactId>
      <version>${commons-lang3.version}</version>
    </dependency>

  </dependencies>
</dependencyManagement>

版本管理

<properties>
  <maven.compiler.source>17</maven.compiler.source>
  <maven.compiler.target>17</maven.compiler.target>
  <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  <spring-boot.version>3.0.2</spring-boot.version>
  <vertx.version>4.2.3</vertx.version>
  <fastjson2.version>2.0.33</fastjson2.version>
  <okhttp.version>3.14.9</okhttp.version>
  <guava.version>32.0.1-jre</guava.version>
  <hutool.version>5.8.20</hutool.version>
  <commons-lang3.version>3.12.0</commons-lang3.version>
</properties>

Module模块emqx-client

<dependencies>

  <dependency>
    <groupId>com.squareup.okhttp3</groupId>
    <artifactId>okhttp</artifactId>
  </dependency>

  <dependency>
    <groupId>io.vertx</groupId>
    <artifactId>vertx-mqtt</artifactId>
  </dependency>

  <dependency>
    <groupId>io.vertx</groupId>
    <artifactId>vertx-core</artifactId>
  </dependency>

  <dependency>
    <groupId>com.alibaba.fastjson2</groupId>
    <artifactId>fastjson2</artifactId>
  </dependency>

  <dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-api</artifactId>
  </dependency>

  <dependency>
    <groupId>com.google.guava</groupId>
    <artifactId>guava</artifactId>
  </dependency>

  <dependency>
    <groupId>cn.hutool</groupId>
    <artifactId>hutool-all</artifactId>
  </dependency>

  <dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-lang3</artifactId>
  </dependency>

</dependencies>

Module模块emqx-client-starter

<dependencies>

  <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter</artifactId>
  </dependency>

  <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-autoconfigure</artifactId>
  </dependency>

  <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-configuration-processor</artifactId>
    <optional>true</optional>
  </dependency>

  <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-test</artifactId>
    <scope>test</scope>
  </dependency>

  <dependency>
    <groupId>com.gitee.xmhzzz</groupId>
    <artifactId>emqx-client</artifactId>
    <version>${project.version}</version>
  </dependency>

</dependencies>

Module模块emqx-example-service

<dependencies>

  <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter</artifactId>
  </dependency>

  <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
  </dependency>

  <!-- mqtt client -->
  <dependency>
    <groupId>com.gitee.xmhzzz</groupId>
    <artifactId>emqx-client-starter</artifactId>
    <version>${project.version}</version>
  </dependency>

</dependencies>

emqx-client组件实现

emqx-client主要划分四部分

MQTT客户端上下文、MQTT配置信息、MQTT消息监听接口、MQTT消息推送

EMQX客户端上下文

● 连接管理：管理MQTT连接及断开连接功能。
● 订阅列表：客户端订阅的所有主题及其对应的QoS（服务质量）级别。
● 推送消息：发送消息到EMQX中。

接口定义

/**
  * @ClassName
  * @Description emqx-client 上下文
  * @Author wzq
  * @Date 2024/1/22 14:07
  * @Version 1.0
  */
public interface IMqttClient {

    /**
      * Description: EMQX 建立连接
      * @Author: xmh
      * @Create: 2024/7/13-14:49
      * @Version: v1.0
      **/
    boolean connect();

    /**
      * Description: EMQX 关闭连接
      * @Author: xmh
      * @Create: 2024/7/13-14:50
      * @Version: v1.0
      **/
    boolean disconnect();

    /**
      * Description: EMQX-CLIENT 是否在线
      * @Author: xmh
      * @Create: 2024/7/13-14:49
      * @Version: v1.0
      **/
    boolean isConnect();

    /**
      * Description: EMQX-CLIENT 推送消息
      * @Author: xmh
      * @Create: 2024/7/13-14:49
      * @Version: v1.0
      **/
    IMqttResp publish(IMqttReq request);

    /**
      * Description: 关闭 EMQX-CLIENT 
      * @Author: xmh
      * @Create: 2024/7/13-14:49
      * @Version: v1.0
      **/
    void mqttStop();

}

EMQX-CLIENT上下文接口实现

EMQX-CLIENT技术框架选择Vert.x.
创建MqttClientContext类并继承Vert.x框架AbstractVerticle和实现接口IMqttClient

/**
 * @ClassName MqttClientContext emqx-client 上下文
 * @Description
 * @Author wzq
 * @Date 2024/7/9 17:16
 * @Version 1.0
 */
@Slf4j
public class MqttClientContext extends AbstractVerticle implements IMqttClient{

    public static final Long RECONNECT_INTERVAL = 3600L;
    private static final String allWildcard = "#";
    private static final String singleWildcard = "+";
    private final static String SMART_UP_TOPIC_FORMAT = "$share/%s/%s";
    private final static List<String> topicFormatList = Lists.newArrayList(
            SMART_UP_TOPIC_FORMAT);
    private final IMqttConfig mqttConfig;
    private final List<IMqttListener> IMqttListenerList;
    private CountDownLatch countDownLatch;
    private MqttClient mqttClient;
    private String subscribeGroup;

    public MqttClientContext(IMqttConfig mqttConfig, List<IMqttListener> IMqttListenerList, String subscribeGroup) {
        this.mqttConfig = mqttConfig;
        this.IMqttListenerList = IMqttListenerList;
        this.subscribeGroup = subscribeGroup;
    }
    
    /**
     * Description:在 Vert.x 中，start 方法是 Verticle 类的一个生命周期方法，它在 verticle 被部署并准备好开始执行时被调用。如果你的 verticle 在启动时需要执行一些简单的同步操作，你可以重写这个方法来放置你的启动代码。
     * @Author: xmh
     **/
    @Override
    public void start() {
          if (Objects.isNull(this.mqttClient)) {
            this.mqttClient = MqttClient.create(vertx, buildMqttClientOptions());
        }
        //接收服务端消息处理handler
        mqttClient.publishHandler(pub -> {
            Buffer buffer = pub.payload();
            String topicName = pub.topicName();
            String[] split = topicName.split("/");
            String string = buffer.toString(StandardCharsets.UTF_8);
            CommonMessage message = new CommonMessage();
            HashMap<String, Object> headers = Maps.newHashMap();
            headers.put("topic",topicName);
            headers.put("qos",pub.qosLevel().value());
            message.setHeaders(headers);
            message.setMessageContent(string);
            IMqttListenerList.forEach(f -> {
                String topic = f.getTopic();
                if (topicRute(topic, split)){
                    f.onMessage(message);
                }
            });

        });
        mqttClient.closeHandler(unused -> getVertx().setTimer(RECONNECT_INTERVAL, h -> start()));
        mqttClient.connect(mqttConfig.getTcpPort(), mqttConfig.getHost(),
                s -> {
                    if (s.succeeded()) {
                        log.info("IMqttClient connect success.");
                        subscribe();
                        countDownLatch.countDown();
                    } else {
                        log.error("IMqttClient connect fail: ", s.cause());
                        if (s.cause() != null) {
                            vertx.setTimer(RECONNECT_INTERVAL, handler -> this.start());
                        }
                    }
                });
    }

     /**
     * Description: 在 Vert.x 中，如果你的 verticle 需要在停止时执行一些简单的同步清理任务，你可以重写 stop 方法来放置你的清理代码。这个方法在 Vert.x 准备停止 verticle 时调用，通常用于关闭资源，如数据库连接、网络连接、文件句柄等。
     * @Author: xmh
     **/
    @Override
    public void stop() {
         mqttClient.closeHandler(null);
        mqttClient.disconnect((handler) -> {
            if (handler.succeeded()) {
                vertx.close();
                log.info("IMqttClient disConnect success.");
            } else {
                log.error("IMqttClient disConnect fail: ", handler.cause());
            }
        }).exceptionHandler(event -> {
            log.error("IMqttClient fail: ", event.getCause());
        });
    }
    

    /**
      * Description: EMQX 建立连接
      * @Author: xmh
      **/
    @Override
    public boolean connect() {
        log.info("emqx connect ing ......");
        countDownLatch = new CountDownLatch(1);
        Vertx.vertx().deployVerticle(this);
        try {
            countDownLatch.await();
        } catch (InterruptedException e) {
            throw new RuntimeException(e);
        }
        return true;
    }

     /**
      * Description: EMQX 关闭连接
      * @Author: xmh
      **/
    @Override
    public boolean disconnect() {
          if (!isConnect()) {
            log.warn("IMqttClient no connect");
            return false;
        }
        vertx.undeploy(deploymentID(), (handler) -> {
            if (handler.succeeded()) {
                log.info("undeploy success");
            } else {
                log.warn("undeploy fail, {}. ", handler.cause().getMessage(), handler.cause());
            }
        });
        return true;
    }

    /**
      * Description: EMQX-CLIENT 是否在线
      * @Author: xmh
      **/
    @Override
    public boolean isConnect() {
        return Optional.ofNullable(mqttClient).map(MqttClient::isConnected).orElse(false);
    }

     /**
      * Description: EMQX-CLIENT 推送消息
      * @Author: xmh
      **/
    @Override
    public IMqttResp publish(IMqttReq request) {
         MqttResp response = new MqttResp();
        Buffer payload = Buffer.buffer(request.getMessageContent());
        mqttClient.publish(request.getTopic(), payload, MqttQoS.valueOf(request.getQos()), false, false, s -> {
            if (s.succeeded()) {
                log.info("===>IMqttClient publish success[{}]", s.result());
            } else {
                log.error("===>IMqttClient publish fail.", s.cause());
            }
        });
        response.setCode(200);
        return response;
    }

      /**
      * Description: 关闭 EMQX-CLIENT 
      * @Author: xmh
      **/
    @Override
    public void mqttStop() {
         this.stop();
    }

    
     private MqttClientOptions buildMqttClientOptions() {
        MqttClientOptions options = new MqttClientOptions();
        options.setClientId("micro-client-" + RandomStringUtils.randomAlphanumeric(17));
        options.setMaxMessageSize(100_000_000);
        options.setKeepAliveInterval(60);
        options.setPassword(mqttConfig.getPassword());
        options.setUsername(mqttConfig.getUsername());
        options.setSsl(mqttConfig.getSsl());
        options.setReconnectInterval(RECONNECT_INTERVAL);
        options.setReconnectAttempts(Integer.MAX_VALUE);
        return options;
    }

    private boolean topicRute(String topic, String[] split) {
        String[] listenerTopic = topic.split("/");
        boolean flag = true;
        for (int i = 0; i < split.length; i++) {
            if (allWildcard.equals(listenerTopic[i])) {
                break;
            }
            if (singleWildcard.equals(listenerTopic[i])) {
                continue;
            }
            if (!split[i].equals(listenerTopic[i])) {
                flag = false;
                break;
            }
        }
        return flag;
    }

    private void subscribe() {
        List<String> subscribeTopicSuffix = mqttConfig.getSysSubscribeTopics();
        if (subscribeTopicSuffix == null || subscribeTopicSuffix.isEmpty()) {
            throw new IllegalArgumentException("subscribe topic is empty");
        }
        List<String> subscribeTopic = subscribeTopicSuffix.stream()
                .flatMap(topicSuffix -> topicFormatList.stream().map(t -> String.format(t,subscribeGroup, topicSuffix)))
                .toList();
        subscribeTopic.forEach(topic -> mqttClient.subscribe(topic, 0, s -> {
            if (s.succeeded()) {
                log.info("===>IMqttClient subscribe success.  result[{}] topic[{}]", s.result(), topic);
            } else {
                log.error("===>IMqttClient subscribe fail. topic[{}] ", topic, s.cause());
            }
        }));
    }

}

EMQX配置信息

接口定义

public interface IMqttConfig {

    
    String getHost();

    Integer getTcpPort();

    Integer getHttpPort();

    String getUsername();

    String getPassword();

    Boolean getSsl();

    //订阅的系统topic
    List<String> getSysSubscribeTopics();

    String getAppId();

    String getAppSecret();
}

Config接口实现

/**
 * @ClassName MqttConfig
 * @Description
 * @Author wzq
 * @Date 2024/7/9 9:36
 * @Version 1.0
 */
@Data
public class MqttConfig implements IMqttConfig{

    /**
      * EMQX 地址
      */
    private String host;

    /**
      * EMQX tcp端口
      */
    private Integer tcpPort;

    /**
     * EMQX Http端口
     */
    private Integer httpPort;

    /**
      * EMQX 登录名称
      */
    private String username;

    /**
     * EMQX 登录名称
     */
    private String password;

    private String appId;

    private String appSecret;

    private Boolean ssl = false;

    //订阅的系统topic
    private List<String> sysSubscribeTopics;


}

EMQX-CLIENT消息推送

接口定义

/**
 * @InterfaceName IMqttClientApi
 * @Description
 * @Author wzq
 * @Date 2024/7/8 17:04
 * @Version 1.0
 */
public interface IMqttClientApi {

    /**
      * @Description Http 方式推送消息
      */
    IMqttResp httpPublish(IMqttReq request);


    /**
      * @Description TCP 方式推送消息
      */
    IMqttResp tcpPublish(IMqttReq request);

}

model定义

public interface IMqttReq {

    String getTopic();

    Integer getQos();

    String getMessageContent();

}

@Data
@Accessors(chain = true)
public class MqttReq implements IMqttReq{

    private String topic;

    private Integer qos;

    private String messageContent;
}

public interface IMqttResp {
     Integer getCode();

     String getMessage();

     Map getData();
}

@Data
@Accessors(chain = true)
public class MqttResp implements IMqttResp{

    private Integer code;

    private String message;

    private Map data;

}

api接口实现

/**
 * @ClassName MqttApiImpl
 * @Description
 * @Author wzq
 * @Date 2024/7/9 19:23
 * @Version 1.0
 */
@Slf4j
public class MqttApiImpl implements IMqttClientApi{

    private final IMqttConfig mqttConfig;

    private final IMqttClient mqttClient;

    public MqttApiImpl(IMqttConfig mqttConfig, IMqttClient mqttClient) {
        this.mqttConfig = mqttConfig;
        this.mqttClient = mqttClient;
    }
    
    private static final MediaType HTTP_MEDIA_TYPE_JSON_UTF8 = MediaType.parse("application/json; charset=utf-8");

    @Override
    public IMqttResp httpPublish(IMqttReq request) {
        return BeanUtil.toBeanIgnoreError(this.callHttp(request), MqttResp.class);
    }

    @Override
    public IMqttResp tcpPublish(IMqttReq request) {
        return mqttClient.publish(request);
    }

    private Map<String, ?> callHttp(IMqttReq params) {
        String path = "";
        String url = mqttConfig.getHost() + path;
        log.debug("http url[{}] requestBodyStr[{}]", url, params.getMessageContent());

        Dict dict = Dict.create();
        dict.set("topic", params.getTopic());              //订阅主题
        dict.set("payload", params.getMessageContent());   //内容
        dict.set("qos", 0);                                //质量
        dict.set("retain",false);                          //是否保存
        String requestBodyStr = JSON.toJSONString(dict);

        RequestBody requestBody = RequestBody.create(HTTP_MEDIA_TYPE_JSON_UTF8, requestBodyStr);
        Request request = new Request.Builder()
        .url(url)
        .post(requestBody)
        .header("Content-Type", "application/json")
        .header("Authorization", Credentials.basic(mqttConfig.getAppId(), mqttConfig.getAppSecret()))
        .build();

        try (Response response = getHttpClientInstance().newCall(request).execute()) {
            log.debug("Call http success. url[{}] response[{}]", url, response);

            if (response.code() == 404) {
                return ImmutableMap.of("code", 404, "Message", "404 Not Found");
            } else if (!response.isSuccessful()) {
                return ImmutableMap.of("code", response.code(), "Message", "Server Error");
            }

            // 输出响应内容
            assert response.body() != null;
            String string = response.body().string();
            return JSON.parseObject(string);
        } catch (IOException e) {
            log.warn("Call http failed, {}. url[{}] requestBodyStr[{}]", e.getMessage(), url, requestBodyStr);
        }

        return Collections.emptyMap();
    }

    private OkHttpClient getHttpClientInstance() {
        return HttpClientHolder.HTTP_CLIENT_INSTANCE;
    }

    private static class HttpClientHolder {
        private static final OkHttpClient HTTP_CLIENT_INSTANCE = new OkHttpClient.Builder()
        .connectTimeout(Duration.ofSeconds(3))
        .readTimeout(Duration.ofSeconds(3))
        .writeTimeout(Duration.ofSeconds(3))
        .dispatcher(new Dispatcher(Executors.newFixedThreadPool(8)))
                .build();

    }
}

EMQX-CLIENT消息监听接口

接口定义

public interface IMqttListener {

    /**
     * Description: 路由topic
     **/
    String getTopic();

    /**
     * Description: 消费类型 广播、集群模式
     **/
    String getType();

    /**
     * Description: 消息处理
     **/
    void onMessage(IMessage message);
}

model定义

public interface IMessage {

    String getDeviceId();

    String getProductId();

    Map<String, Object> getHeaders();

    String getMessageContent();

}


@Data
@Accessors(chain = true)
public class CommonMessage implements IMessage{

    private String deviceId;

    private String productId;

    private String messageContent;

    protected volatile Map<String, Object> headers = Maps.newConcurrentMap();

}

emqx-client-starter模块实现

emqx-client-starter 是一个用于将emqx-client集成到 Spring Boot 应用中的自动配置启动器（starter）。在 Spring Boot 中，一个 starter 是一个包含特定库依赖和自动配置类的 POM 文件，它简化了应用程序的依赖管理和配置。

自动加载类EmqxClientAutoConfiguration

定义自动加载类条件
自动加载emqx-client模块的配置类MqttConfig
在没有IMqttListener类型的类加载则默认实现IMqttListener接口
自动加载emqx-client模块的配置类MqttClientContext
自动加载emqx-client模块的配置类IMqttClientApi

@Slf4j
@Configuration
@ConditionalOnProperty(value = "emqx.sdk.enable", havingValue = "true")
public class EmqxClientAutoConfiguration {

    @Bean
    @ConfigurationProperties(prefix = "emqx.sdk")
    public IMqttConfig mqttConfig() {
        return new MqttConfig();
    }

    @Bean
    @ConditionalOnMissingBean
    public IMqttListener mqttListener() {
        return new IMqttListener() {
            @Override
            public String getTopic() {
                return "#";
            }

            @Override
            public String getType(){
                return "";
            }
            @Override
            public void onMessage(IMessage message) {
                LoggerFactory.getLogger(IMqttListener.class)
                .info("[默认消息监听器]接收到消息. Message[{}]", JSON.toJSONString(message));
            }
        };
    }

    @Bean
    @ConditionalOnMissingBean
    @ConditionalOnBean({IMqttConfig.class, IMqttListener.class})
    public IMqttClient mqttClient(MqttConfig emqXConfig, List<IMqttListener> IMqttListenerList, Environment environment) {
        String serviceName = environment.getProperty("spring.application.name");
        String env = environment.getProperty("spring.profiles.active");
        IMqttClient mqttClient = new MqttClientContext(emqXConfig, IMqttListenerList,serviceName+"-"+env);
        Executors.newSingleThreadExecutor().execute(mqttClient::connect);
        Runtime.getRuntime().addShutdownHook(new Thread(mqttClient::mqttStop));
        return mqttClient;
    }

    @Bean("mqttExecutorService")
    @ConditionalOnBean({IMqttClient.class, IMqttListener.class})
    public ExecutorService mqttExecutorService() {
        ExecutorService executorService = new ThreadPoolExecutor(
            1, 8,
            1, TimeUnit.MINUTES,
            new LinkedBlockingQueue<>(1024),
            new ThreadFactoryBuilder().setNameFormat("mqttlogin-task-%d").build(),
            (r, executor) -> log.warn("MQTT  task executor rejectedExecution , Runnable Class : {}",
                                      r.getClass().getSimpleName()));
        return executorService;
    }

    @Bean
    @ConditionalOnMissingBean
    @ConditionalOnBean({IMqttConfig.class, IMqttClient.class})
    public IMqttClientApi mqttApi(IMqttClient client,IMqttConfig config) {
        return new MqttApiImpl(config,client);
    }

}

自定义META-INF

Sping Boot提供了一种方便的方式来将自定义的配置文件放置在 META.NF目录下，并将其添加到classpath中。
在SpringBoot2.7.x版本之后，慢慢不支持META-INF/spring.factories文件了，需要导入的自动配置类可以放在/META-INF/spring/org.springframework.boot.autoconfigure.AutoConfiguration.imports文件中

com.gitee.xmhzzz.emqx.strater.EmqxClientAutoConfiguration

emqx-example-service模块代码实现

emqx-example-service模块是Spring Boot Web 项目，主要实现 EMQX-CLIENT生命周期管理及消息的发送和消费。

添加web项目启动类

@SpringBootApplication
public class EmqxExampleApplication {

    private static final Logger logger = LoggerFactory.getLogger(EmqxExampleApplication.class);
    public static void main(String[] args) {

        SpringApplication.run(EmqxExampleApplication.class, args);
        logger.info("==================== emqx-example 启动完成 ====================");
    }

}

业务代码

controller层消息推送

@RequestMapping("/web/emqx")
@RestController
public class EmqxController {

    @Autowired
    private EmqxPublishService emqxPublishService;

    @PostMapping("/tcp/publish")
    public Result<Void> tcpPublish(@RequestBody MqttReq req){
        emqxPublishService.tcpPublish(req);
        return Result.ok();
    }

    @PostMapping("/http/publish")
    public Result<Void> httpPublish(@RequestBody MqttReq req){
        emqxPublishService.httpPublish(req);
        return Result.ok();
    }
}

service层消息推送

@Service
public class EmqxPublishService {

    @Autowired(required = false)
    private IMqttClientApi mqttClientApi;


   public IMqttResp httpPublish(IMqttReq request){
        IMqttResp iMqttResp = mqttClientApi.httpPublish(request);
        return iMqttResp;
    }

    public IMqttResp tcpPublish(IMqttReq request){
        IMqttResp iMqttResp = mqttClientApi.tcpPublish(request);
        return iMqttResp;
    }

}

HTTP公共返回类

@Data
public class Result<T> {

    /**
     * 状态码
     */
    private Integer code;

    /**
     * 状态描述
     */
    private String message;

    /**
     * 数据
     */
    private T body;

    public Result() {
        this(ResultCode.SUCCESS.getCode(), ResultCode.SUCCESS.getMsg());
    }

    public Result(Integer code, String message) {
        this(code, message, null);
    }

    public Result(Integer code, String message, T body) {
        this.code = code;
        this.message = message;
        this.body = body;
    }

    /**
      * 返回成功消息
      */
    public static <T> Result<T> ok() {
        return ok(null);
    }

    /**
     * 返回成功消息
     *
     * @param body 数据
     * @return 成功消息
     */
    public static <T> Result<T> ok(T body) {
        return ok(ResultCode.SUCCESS.getMsg(), body);
    }

    /**
     * 返回成功消息
     *
     * @param message 状态描述
     * @param body    数据
     * @return 成功消息
     */
    public static <T> Result<T> ok(String message, T body) {
        return new Result<>(ResultCode.SUCCESS.getCode(), message, body);
    }

    /**
     * 返回失败消息
     *
     * @param message 状态描述
     * @return 失败消息
     */
    public static <T> Result<T> fail(String message) {
        return fail(ResultCode.FAIL.getCode(), message, null);
    }

    /**
     * 返回失败消息
     *
     * @param message 状态描述
     * @param body    数据
     * @return 失败消息
     */
    public static <T> Result<T> fail(String message, T body) {
        return fail(ResultCode.FAIL.getCode(), message, body);
    }

    /**
     * 返回失败消息
     *
     * @param code    状态码
     * @param message 状态描述
     * @return 失败消息
     */
    public static <T> Result<T> fail(Integer code, String message) {
        return fail(code, message, null);
    }

    /**
     * 返回失败消息
     *
     * @param resultCode 错误码枚举
     * @return
     */
    public static <T> Result<T> fail(ResultCode resultCode) {
        return fail(resultCode.getCode(), resultCode.getMsg());
    }

    /**
     * 返回失败消息
     *
     * @param resultCode 错误码枚举
     * @param body           数据
     * @return
     */
    public static <T> Result<T> fail(ResultCode resultCode, T body) {
        return fail(resultCode.getCode(), resultCode.getMsg(), body);
    }

    /**
     * 返回失败消息
     *
     * @param code    状态码
     * @param message 状态描述
     * @param body    数据
     * @return
     */
    public static <T> Result<T> fail(Integer code, String message, T body) {
        return new Result<>(code, message, body);
    }

    /**
     * 是否成功
     *
     * @return 结果
     */
    public boolean isSuccess() {
        return Objects.equals(this.code, ResultCode.SUCCESS.getCode());
    }
}


@Getter
@AllArgsConstructor
public enum ResultCode
{

    /**
     *
     */
    SUCCESS(200, "成功"),
    FAIL(101, "失败"),
    SYSTEM_BUSY(1000, "系统繁忙"),
    UNKNOWN(9999999, "未知错误");

    /**
     * 状态码
     */
    private final Integer code;
    /**
     * 状态描述
     */
    private final String msg;


    public static ResultCode of(Integer code) {
        return Arrays.stream(ResultCode.values()).filter(values -> values.code.equals(code)).findFirst().orElse(UNKNOWN);
    }

    public static ResultCode ofNull(Integer code) {
        return Arrays.stream(ResultCode.values()).filter(values -> values.code.equals(code)).findFirst().orElse(null);
    }

}

配置信息

application.yml

spring:
  application:
    name: emqx-example-service
server:
  port: 8080
  servlet:
    context-path: /emqx-example-service

application-dev.yml

emqx:
  sdk:
    enable: true
    host: 127.0.0.1
    tcpPort: 1883
    httpPort: 18083
    username: emqx-client
    password: a123456
    appId: 0c94e0423b409483
    appSecret: e379f64e96d383ced430804512c3e7f1
    ssl: false
    sysSubscribeTopics:
      - sys/+/+/thing/event/property/post

其它

源码地址Gitee
关注公众号【 java程序猿技术】获取EMQX实践系列文章