MQTT记录(概述,docker部署,基于spring-integration-mqtt实现消息订阅与发布,客户端工具测试)

需要spring-boot集成spring-integration-mqtt代码的直接跳到第5部分

1.MQTT介绍

1.1 MQTT是什么呢?

message queue telemetry translation
是一种基于发布与订阅的轻量级消息传输协议.适用于低带宽或网络不稳定的物联网应用.开发者可以使用极少的代码来实现物联网设备之间的消息传输.mqtt协议广泛应用于物联网,移动互联网,智能硬件,车联网,远程医疗,电力石油等领域

1.2 mqtt必须具备一下几点优势:

简单易实现
消息传递可靠,支持QoS
轻量省带宽
数据无关性,不关心数据格式
心跳模式(时刻感知客户端状态)

1.3 MQTT与HTTP协议的区别

mqtt最小报文仅为2字节,比http占用更少的网络开销
mqtt基于发布订阅模型,http基于请求相应.mqtt支持双工通信,http不支持
mqtt是有状态的,http是无状态的
mqtt具有断开重连机制,http不支持

1.4 可靠的消息传递(QoS)

MQTT 协议提供了 3 种消息服务质量等级（Quality of Service），保证了在不同的网络环境下消息传递的可靠性
QoS 0：消息最多传递一次
如果当时客户端不可用，则会丢失该消息。发布者发送一条消息之后，就不再关心它有没有发送到对方，也不设置任何重发机制
QoS 1：消息传递至少 1 次
包含了简单的重发机制，发布者发送消息之后等待接收者的 ACK，如果没收到 ACK 则重新发送消息。这种模式能保证消息至少能到达一次，但无法保证消息重复
QoS 2：消息仅传送一次
设计了重发和重复消息发现机制，保证消息到达对方并且严格只到达一次

2.docker部署一个emqx容器

安装运行emqx镜像
docker run -itd --restart=always --name emqx -p 1883:1883 -p 8083:8083 -p 8084:8084 -p 8883:8883 -p 18083:18083 emqx/emqx:latest
安装完成之后,我们相当于有了一个mqtt的服务器
看一下运行日志:docker logs -f emqx

[root@VM-4-3-centos dockerfile]# docker logs -f emqx
WARNING: Default (insecure) Erlang cookie is in use.
WARNING: Configure node.cookie in /opt/emqx/etc/emqx.conf or override from environment variable EMQX_NODE__COOKIE
WARNING: Use the same config value for all nodes in the cluster.
EMQX_RPC__PORT_DISCOVERY [rpc.port_discovery]: manual
EMQX_LOG__FILE_HANDLERS__DEFAULT__ENABLE [log.file_handlers.default.enable]: false
EMQX_LOG__CONSOLE_HANDLER__ENABLE [log.console_handler.enable]: true
EMQX_NODE__NAME [node.name]: emqx@172.17.0.7
Listener ssl:default on 0.0.0.0:8883 started.
Listener tcp:default on 0.0.0.0:1883 started.
Listener ws:default on 0.0.0.0:8083 started.
Listener wss:default on 0.0.0.0:8084 started.
Listener http:dashboard on :18083 started.
EMQX 5.0.16 is running now!

此时mqtt安装完毕,上述的四个端口只要防火墙允许通过,我们就可以用mqtt官方提供的客户端MQTTX进行连接了
查询启动的容器 docker ps
删除容器 docker rm -f 容器名

3.客户端工具MQTTBox和MQTTX安装(2选1)

3.1 MQTTBox安装

安装地址:http://workswithweb.com/mqttbox.html
如果无法访问,可以百度云获取
链接：https://pan.baidu.com/s/1HKd7qfHmezBwY6DXif9E1g
提取码：sei6
解压后找到MQTTBox.exe运行即可

客户端连接

3.2 MQTTX安装

安装地址:https://mqttx.app/zh
客户端连接

4.发布订阅测试(MQTTBOX)

mqttbox的好处是发布订阅在一个页面,便于观察,发布的topic是emqx/123/test,订阅的时候用emqx/+/test订阅,+是通配符

5.spring-boot项目基于spring-integration-mqtt实现

代码基于spring-integration-mqtt实现.spring-integration-mqtt内依赖了org.eclipse.paho.client.mqttv3(这个是Paho Java原生库)
下面的内容足以应对开发需求,实现了并发处理消息的能力,提供了回复消息的思路(往指定topic发送消息,让另一个客户端进行接收)

5.1 application.yml

mqtt:
  protocol: tcp
  host: yourHost
  port: 1883
  username: admin
  password: admin
  client-id: admin
  inbound-topic: emqx/+/test,emqx/+/test_reply,emqx/young/+
  keep-alive-interval: 60
  connection-timeout: 120

5.2 pom.xml

	<parent>
        <artifactId>spring-boot-starter-parent</artifactId>
        <groupId>org.springframework.boot</groupId>
        <version>2.4.11</version>
    </parent>

    <dependencies>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>

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

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.83</version>
        </dependency>

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <scope>test</scope>
        </dependency>
		//核心依赖就这个
		<dependency>
            <groupId>org.springframework.integration</groupId>
            <artifactId>spring-integration-mqtt</artifactId>
            <version>5.5.5</version>
        </dependency>
    </dependencies>
		

5.3 代码实现

大致的逻辑
1.通过协议ip端口等参数进行mqtt连接
2.定义一个订阅者客户端进行数据统一接入
3.定义一个topic路由器进行消息分发,每一个topic对应一个channel
4.接收消息
5.定义一个发布者客户端进行消息发布
6.topic订阅与取消订阅

5.3.1 配置类(5个)

MqttConnectConfiguration:mqtt连接配置
MqttInboundConfiguration:订阅消息的客户端
MqttOutboundConfiguration:发布消息的客户端
MqttMessageChannel:消息通道
ThreadPoolOfInbound:统一入栈的线程池,处理并发消息

/**
 * @Description: mqtt连接配置
 * @Author: young
 * @Date: 2023/2/15 16:26
 */
@Configuration
@Data
@ConfigurationProperties(prefix = "mqtt")
public class MqttConnectConfiguration {
    //协议
    private String protocol;

    //ip
    private String host;

    //端口
    private Integer port;

    private String username;

    private String password;

    //客户端id
    private String clientId;

    //客户端连接时需要自动订阅的topic,多个用逗号分割
    private String inboundTopic;

    //心跳时间:默认60s,如果该时间内客户端没有收到消息,客户端ping一次服务端,判断服务端是否宕机
    private Integer keepAliveInterval;

    //定义了客户端等待建立到MQTT服务器的网络连接的最大时间间隔,默认超时为30秒
    private Integer connectionTimeout;


    @Bean
    //连接对象
    public MqttConnectOptions mqttConnectOptions() {
        MqttConnectOptions mqttConnectOptions = new MqttConnectOptions();
        serviceUrl = new StringBuilder()
                .append(protocol.trim())
                .append("://")
                .append(host.trim())
                .append(":")
                .append(port)
                .toString();
        mqttConnectOptions.setServerURIs(new String[]{serviceUrl});
        mqttConnectOptions.setUserName(username);
        mqttConnectOptions.setPassword(password.toCharArray());
        mqttConnectOptions.setAutomaticReconnect(true);
        mqttConnectOptions.setKeepAliveInterval(keepAliveInterval);
        mqttConnectOptions.setConnectionTimeout(connectionTimeout);
        //重连不清除session
        mqttConnectOptions.setCleanSession(false);
        return mqttConnectOptions;
    }

    @Bean
    //客户端工厂
    public MqttPahoClientFactory mqttClientFactory() {
        DefaultMqttPahoClientFactory factory = new DefaultMqttPahoClientFactory();
        //建立连接
        factory.setConnectionOptions(mqttConnectOptions());
        return factory;
    }

    //tcp://127.0.0.1:1883
    private String serviceUrl;
}



/**
 * @Description: 订阅消息的客户端
 * @Author: young
 * @Date: 2023/2/15 16:51
 */
@Slf4j
@Configuration
@IntegrationComponentScan
public class MqttInboundConfiguration {

    @Resource
    private MqttConnectConfiguration mqttConnectConfiguration;
    @Resource
    private MqttPahoClientFactory mqttClientFactory;

    @Resource(name = ChannelName.INBOUND)
    private MessageChannel inboundChannel;

    /**
     * 消费者订阅消息
     */
    @Bean(name = "adapter")
    public MessageProducerSupport mqttInbound() {
        //消息适配器
        MqttPahoMessageDrivenChannelAdapter adapter = new MqttPahoMessageDrivenChannelAdapter(
                mqttConnectConfiguration.getClientId() + "_consumer_" + System.currentTimeMillis(),
                mqttClientFactory, mqttConnectConfiguration.getInboundTopic().split(","));
        //消息转换器
        DefaultPahoMessageConverter converter = new DefaultPahoMessageConverter();
        //统一字节传输
        converter.setPayloadAsBytes(true);
        adapter.setConverter(converter);
        //只接收一次
        adapter.setQos(2);
        //入栈的消息统一交给inbound通道处理
        adapter.setOutputChannel(inboundChannel);
        return adapter;
    }

    /**
     * 非法主题数据进入
     */
    @Bean
    @ServiceActivator(inputChannel = ChannelName.DEFAULT)
    public MessageHandler defaultInboundHandler() {
        return message -> {
            log.info("默认通道接收到数据但无法处理,topic:{},payload:{}", message.getHeaders().get(MqttHeaders.RECEIVED_TOPIC), new String((byte[]) message.getPayload()));
        };
    }
}


/**
 * @Description: 发布消息的客户端
 * @Author: young
 * @Date: 2023/2/15 17:00
 */
@Configuration
public class MqttOutboundConfiguration {

    @Resource
    private MqttConnectConfiguration mqttConnectConfiguration;
    @Resource
    private MqttPahoClientFactory mqttClientFactory;

    /**
     * 生产者发布消息
     */
    @Bean
    @ServiceActivator(inputChannel = ChannelName.OUTBOUND)
    public MessageHandler mqttOutbound() {
        MqttPahoMessageHandler messageHandler = new MqttPahoMessageHandler(
                mqttConnectConfiguration.getClientId() + "_producer_" + System.currentTimeMillis(),
                mqttClientFactory);
        DefaultPahoMessageConverter converter = new DefaultPahoMessageConverter();
        converter.setPayloadAsBytes(true);
        messageHandler.setAsync(true);
        //只发送一次,不关心是客户端(订阅者)是否接收到
        messageHandler.setDefaultQos(0);
        messageHandler.setConverter(converter);
        return messageHandler;
    }
}


/**
 * @Description: 消息的通道,通过ExecutorChannel引入线程池,可以并发接收数据
 * @Author: young
 * @Date: 2023/2/15 16:35
 */
@Configuration
public class MqttMessageChannel {

//    @Bean(name = ChannelName.INBOUND)
//    public MessageChannel inboundChannel() {
//        return new DirectChannel();
//    }
    @Resource(name = "inboundThreadPool")
    private Executor inboundThreadPool;

    //通过ExecutorChannel引入线程池,可以并发接收数据
    @Bean(name = ChannelName.INBOUND)
    public MessageChannel inboundChannel() {
        return new ExecutorChannel(inboundThreadPool);
    }

    @Bean(name = ChannelName.DEFAULT)
    public MessageChannel defaultChannel() {
        return new DirectChannel();
    }

    @Bean(name = ChannelName.OUTBOUND)
    public MessageChannel outboundChannel() {
        return new DirectChannel();
    }

    //每一个指定的通道(或者topic)都可以指定一个线程池来并发处理接收的消息,这里只在inbound中做并发处理
    @Bean(name = ChannelName.TEST)
    public MessageChannel testChannel() {
        return new DirectChannel();
    }

    @Bean(name = ChannelName.TEST_REPLY)
    public MessageChannel testReplyChannel() {
        return new DirectChannel();
    }

    @Bean(name = ChannelName.YOUNG)
    public MessageChannel youngChannel() {
        return new DirectChannel();
    }

}

/**
 * @Description: 统一入栈的线程池
 * @Author: young
 * @Date: 2023/2/17 16:30
 */
@Component
public class ThreadPoolOfInbound {
    @Value("${thread.pool.core-pool-size: 20}")
    private int corePoolSize;

    @Value("${thread.pool.maximum-pool-size: 40}")
    private int maximumPoolSize;

    @Value("${thread.pool.keep-alive-time: 120}")
    private long keepAliveTime;

    @Value("${thread.pool.queue.capacity: 2000}")
    private int capacity;

    @Bean("inboundThreadPool")
    public Executor inboundThreadPool() {
        return new ThreadPoolExecutor(
                corePoolSize,
                maximumPoolSize,
                keepAliveTime,
                TimeUnit.SECONDS,
                new LinkedBlockingQueue<>(capacity),
                //线程名前缀
                new CustomizableThreadFactory("inboundThreadPool-"),
                new ThreadPoolExecutor.DiscardOldestPolicy()
        );
    }
}

5.3.2 topic声明

TopicConstant :topic常量类,可自定义正则
TopicEnum:topic枚举,关键的一个类,根据topic正则匹配到对应的channel中

/**
 * @Description: topic 常量
 * @Author: young
 * @Date: 2023/2/16 11:02
 */
public class TopicConstant {

    public static final String EMQX = "emqx/";
    public static final String YOUNG = "young/";
    public static final String TEST = "/test";
    public static final String REPLY = "_reply";
    public static final String REGEX = "[A-Za-z0-9]+";

}

/**
 * @Description: 主题枚举
 * @Author: young
 * @Date: 2023/2/15 17:13
 */
@Getter
public enum TopicEnum {
    //^限制开始位,$限制结束位
    TEST(Pattern.compile("^" + TopicConstant.EMQX + TopicConstant.REGEX + TopicConstant.TEST + "$"), ChannelName.TEST),
    TEST_REPLY(Pattern.compile("^" + TopicConstant.EMQX + TopicConstant.REGEX + TopicConstant.TEST + TopicConstant.REPLY + "$"), ChannelName.TEST_REPLY),
    YOUNG(Pattern.compile("^" + TopicConstant.EMQX + TopicConstant.YOUNG + TopicConstant.REGEX + "$"), ChannelName.YOUNG),
    //默认通道
    UNKNOWN(Pattern.compile("^.*$"), ChannelName.DEFAULT);


    //主题匹配规则
    Pattern pattern;
    //通道名称
    String channelName;

    TopicEnum(Pattern pattern, String channelName) {
        this.pattern = pattern;
        this.channelName = channelName;
    }

    public static TopicEnum find(String topic) {
        //如果无法匹配topic,则分发到默认通道
        return Arrays.stream(TopicEnum.values()).filter(topicEnum -> topicEnum.pattern.matcher(topic).matches()).findAny().orElse(UNKNOWN);
    }
}

5.3.3 channel与router声明

ChannelName:通道名称
InboundMessageRouter:从INBOUND中获取topic,路由到指定的channel

/**
 * @Description: 消息通道
 * @Author: young
 * @Date: 2023/2/15 16:32
 */
public class ChannelName {

    public static final String INBOUND = "inbound";

    public static final String DEFAULT = "default";

    public static final String OUTBOUND = "outbound";


    public static final String TEST = "test";
    public static final String TEST_REPLY = "testReply";
    public static final String YOUNG = "young";

/**
 * @Description: 入站消息路由
 * @Author: young
 * @Date: 2023/2/15 17:09
 */
@Component
@Slf4j
public class InboundMessageRouter extends AbstractMessageRouter {

    @Resource
    private ApplicationContext applicationContext;

    private static final ConcurrentHashMap<String, MessageChannel> channels = new ConcurrentHashMap<>(16);

    /**
     * 入站数据路由到指定通道
     */
    @Override
    @Router(inputChannel = ChannelName.INBOUND)
    protected Collection<MessageChannel> determineTargetChannels(Message<?> message) {
        MessageHeaders headers = message.getHeaders();
        String topic = headers.get(MqttHeaders.RECEIVED_TOPIC).toString();
        byte[] payload = (byte[]) message.getPayload();

        log.info("接收到消息,topic:{},payload:{}", topic, new String(payload));

        //查询topic是否定义了
        TopicEnum topicEnum = TopicEnum.find(topic);
        if (channels.containsKey(topicEnum.getChannelName())) {
            return Collections.singleton(channels.get(topicEnum.getChannelName()));
        }
        MessageChannel bean = (MessageChannel) applicationContext.getBean(topicEnum.getChannelName());
        channels.put(topicEnum.getChannelName(), bean);
        return Collections.singleton(bean);
    }
}

5.3.4 消息订阅与发布

MessageListenService :消息监听类
重点是@ServiceActivator(inputChannel = ChannelName.TEST)指定要监听的通道
SubscribeTopicJob :定时器,每分钟获取订阅的topic

/**
 * @Description: 消息监听(订阅)
 * @Author: young
 * @Date: 2023/2/17 10:12
 */
@Service
@Slf4j
public class MessageListenService {
    @Resource
    private MqttMessageSenderService messageSenderService;

    @ServiceActivator(inputChannel = ChannelName.TEST)
    public void listenTest(Message<?> message) {
        byte[] payload = (byte[]) message.getPayload();
        log.info("listenTest receive message : {}", new String(payload));
        //消息回复,回复的topic在连接客户端的时候我这边已经订阅了,第二个方法就能及时接收到回复的消息
        String topic = (String) message.getHeaders().get(MqttHeaders.RECEIVED_TOPIC);
        messageSenderService.publish(topic + TopicConstant.REPLY, "test reply...");
    }

    @ServiceActivator(inputChannel = ChannelName.TEST_REPLY)
    public void listenTestReply(Message<?> message) {
        byte[] payload = (byte[]) message.getPayload();
        log.info("listenTestReply receive message : {}", new String(payload));
    }

    @ServiceActivator(inputChannel = ChannelName.YOUNG)
    public void listenYoung(Message<?> message) {
        byte[] payload = (byte[]) message.getPayload();
        log.info("listenYoung receive message : {}", new String(payload));
    }

}


/**
 * @Description: 消息发布
 * @Author: young
 * @Date: 2023/2/16 9:20
 */
@Service
@Slf4j
public class MqttMessageSenderServiceImpl implements MqttMessageSenderService {
    @Resource
    private MqttMessageGateway messageGateway;
    @Resource
    private ObjectMapper objectMapper;

    @Override
    public void publish(String topic, Object message) {
        try {
            messageGateway.publish(topic, objectMapper.writeValueAsBytes(message));
        } catch (JsonProcessingException e) {
            e.printStackTrace();
            log.info("发布消息失败:{}", e.getMessage());
        }
    }

    @Override
    public void publish(String topic, Object message, int qos) {
        try {
            messageGateway.publish(topic, objectMapper.writeValueAsBytes(message), qos);
        } catch (JsonProcessingException e) {
            e.printStackTrace();
            log.info("发布消息失败:{}", e.getMessage());
        }
    }
}

//topic订阅与取消订阅的接口实现
@Service
public class MqttTopicServiceImpl implements MqttTopicService {
    @Resource
    private MqttPahoMessageDrivenChannelAdapter adapter;

    @Override
    public void subscribe(String topic) {
        adapter.addTopic(topic);
    }

    @Override
    public void unsubscribe(String topic) {
        adapter.removeTopic(topic);
    }

    @Override
    public String[] getSubscribedTopic() {
        return adapter.getTopic();
    }
}

//消息发送网关,最终由MessagingGateway发送消息,这个注解不能少
@Component
@MessagingGateway(defaultRequestChannel = ChannelName.OUTBOUND)
public interface MqttMessageGateway {

    void publish(@Header(MqttHeaders.TOPIC) String topic, byte[] payload);

    void publish(@Header(MqttHeaders.TOPIC) String topic, byte[] payload, @Header(MqttHeaders.QOS) int qos);
}


//消息发送接口
public interface MqttMessageSenderService {

    void publish(String topic, Object message);

    void publish(String topic, Object message, int qos);
}

//topic订阅与取消订阅的接口
public interface MqttTopicService {

    void subscribe(@Header(MqttHeaders.TOPIC) String topic);

    void unsubscribe(@Header(MqttHeaders.TOPIC) String topic);

    String[] getSubscribedTopic();
}


//定时器:每分钟监听一次订阅
@Component
@Slf4j
public class SubscribeTopicJob {
    @Resource
    private MqttTopicService mqttTopicService;

    //每分钟打印一下订阅情况
    @Scheduled(cron = "0 0/1 * * * ?")
    @Async
    public void subscribeTopicListen() {
        log.info("订阅了:{}", JSONObject.toJSONString(mqttTopicService.getSubscribedTopic()));
    }
}

代码已提供,大家可以结合工具进行测试,除了可以测试消息发布和订阅,还可以测试客户端自动重连(docker 删除容器:docker rm -f emqx后观察日志)
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