工业互联网需要采集设备底层数据进行实时数据展示与状态预警，由于底层硬件设备无法采用http等重量级请求发送数据，工业上常常采用MQTT协议进行数据传输，本次基于阿里云物联网平台进行数据采集，本次主要云端收集信息与数据下发，云端采用AMQP方式接入，该方式使得云端服务同时具体发布与订阅功能；设备端采用阿里云IOT平台MQTT.fx模拟接入
环境：JDK1.8+maven+springboot
GitHub源码地址：https://github.com/hou296498161/amqp

1.添加以下依赖

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>com.aliyun</groupId>
            <artifactId>aliyun-java-sdk-core</artifactId>
            <version>3.7.1</version>
        </dependency>
        <dependency>
            <groupId>com.aliyun</groupId>
            <artifactId>aliyun-java-sdk-iot</artifactId>
            <version>6.11.0</version>
        </dependency>
        <dependency>
            <groupId>org.msgpack</groupId>
            <artifactId>msgpack</artifactId>
            <version>0.6.12</version>
        </dependency>
        <!-- util for base64-->
        <dependency>
            <groupId>commons-codec</groupId>
            <artifactId>commons-codec</artifactId>
            <version>1.10</version>
        </dependency>
        <dependency>
            <groupId>org.apache.qpid</groupId>
            <artifactId>qpid-jms-client</artifactId>
            <version>0.47.0</version>
        </dependency>

1）、阿里云创建产品，定义自定义topic，类型为发布订阅
2）、创建产品、
3）、创建服务端订阅

2、服务端订阅消息

package com.ali.amqp.subscribe;

import org.apache.commons.codec.binary.Base64;
import org.apache.qpid.jms.JmsConnection;
import org.apache.qpid.jms.JmsConnectionListener;
import org.apache.qpid.jms.message.JmsInboundMessageDispatch;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import javax.jms.*;
import javax.naming.Context;
import javax.naming.InitialContext;
import java.net.URI;
import java.util.Hashtable;
import java.util.UUID;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

/**
 * 云端订阅消息
 */
public class AmqpJavaClient {

    private final static Logger logger = LoggerFactory.getLogger(AmqpJavaClient.class);
    //业务处理异步线程池，线程池参数可以根据您的业务特点调整；或者您也可以用其他异步方式处理接收到的消息
    private final static ExecutorService executorService = new ThreadPoolExecutor(
            Runtime.getRuntime().availableProcessors(),
            Runtime.getRuntime().availableProcessors() * 2, 60, TimeUnit.SECONDS,
            new LinkedBlockingQueue<>(50000));
    public static void subscribe() throws Exception {
        //参数说明参见阿里云文档：AMQP客户端接入说明。
        String accessKey = "你的阿里云accessKey";
        String accessSecret = "你的阿里云 accessSecret";
        //消费组ID
        String consumerGroupId = "DEFAULT_GROUP";
        long timeStamp = System.currentTimeMillis();
        //签名方法：支持hmacmd5，hmacsha1和hmacsha256
        String signMethod = "hmacsha1";
        //控制台服务端订阅中消费组状态页客户端ID一栏将显示clientId参数。
        //建议使用机器UUID、MAC地址、IP等唯一标识等作为clientId。便于您区分识别不同的客户端。
        String clientId = UUID.randomUUID().toString().replaceAll("-","");

        //UserName组装方法，请参见阿里云文档：AMQP客户端接入说明。
        String userName = clientId + "|authMode=aksign"
                + ",signMethod=" + signMethod
                + ",timestamp=" + timeStamp
                + ",authId=" + accessKey
                + ",consumerGroupId=" + consumerGroupId
                + "|";
        //password组装方法，请参见上一篇文档：AMQP客户端接入说明。
        String signContent = "authId=" + accessKey + "&timestamp=" + timeStamp;
        String password = doSign(signContent,accessSecret, signMethod);
        //按照qpid-jms的规范，组装连接URL。
        String connectionUrl = "failover:(amqps://1090243284576461.iot-amqp.cn-shanghai.aliyuncs.com:5671?amqp.idleTimeout=80000)"
                + "?failover.reconnectDelay=30";
        Hashtable<String, String> hashtable = new Hashtable<>();
        hashtable.put("connectionfactory.SBCF",connectionUrl);
        hashtable.put("queue.QUEUE", "default");
        hashtable.put(Context.INITIAL_CONTEXT_FACTORY, "org.apache.qpid.jms.jndi.JmsInitialContextFactory");
        Context context = new InitialContext(hashtable);
        ConnectionFactory cf = (ConnectionFactory)context.lookup("SBCF");
        Destination queue = (Destination)context.lookup("QUEUE");
        // Create Connection
        Connection connection = cf.createConnection(userName, password);
        ((JmsConnection) connection).addConnectionListener(myJmsConnectionListener);

        // Create Session
        // Session.CLIENT_ACKNOWLEDGE: 收到消息后，需要手动调用message.acknowledge()
        // Session.AUTO_ACKNOWLEDGE: SDK自动ACK（推荐）
        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        connection.start();
        // Create Receiver Link
        MessageConsumer consumer = session.createConsumer(queue);
        consumer.setMessageListener(messageListener);
    }

    private static MessageListener messageListener = new MessageListener() {
        @Override
        public void onMessage(Message message) {
            try {
                if (message.getBody(byte[].class)==null){
                    logger.error("收到一条空的消息，topic->{}",message.getStringProperty("topic"));
                }else {
                    logger.info("收到消息：topic->{}:{}",message.getStringProperty("topic"),new String(message.getBody(byte[].class)));
                }
                //1.收到消息之后一定要ACK
                // 推荐做法：创建Session选择Session.AUTO_ACKNOWLEDGE，这里会自动ACK。
                // 其他做法：创建Session选择Session.CLIENT_ACKNOWLEDGE，这里一定要调message.acknowledge()来ACK。
                // message.acknowledge();
                //2.建议异步处理收到的消息，确保onMessage函数里没有耗时逻辑。
                // 如果业务处理耗时过程过长阻塞住线程，可能会影响SDK收到消息后的正常回调。

                executorService.submit(() ->System.out.println(""));
            } catch (Exception e) {
                logger.error("submit task occurs exception ", e);
            }
        }
    };


    private static JmsConnectionListener myJmsConnectionListener = new JmsConnectionListener() {
        /**
         * 连接成功建立
         */
        @Override
        public void onConnectionEstablished(URI remoteURI) {
            logger.info("onConnectionEstablished, remoteUri:{}", remoteURI);
        }

        /**
         * 尝试过最大重试次数之后，最终连接失败。
         */
        @Override
        public void onConnectionFailure(Throwable error) {
            logger.error("onConnectionFailure, {}", error.getMessage());
        }

        /**
         * 连接中断。
         */
        @Override
        public void onConnectionInterrupted(URI remoteURI) {
            logger.info("onConnectionInterrupted, remoteUri:{}", remoteURI);
        }

        /**
         * 连接中断后又自动重连上。
         */
        @Override
        public void onConnectionRestored(URI remoteURI) {
            logger.info("onConnectionRestored, remoteUri:{}", remoteURI);
        }

        @Override
        public void onInboundMessage(JmsInboundMessageDispatch envelope) {}

        @Override
        public void onSessionClosed(Session session, Throwable cause) {}

        @Override
        public void onConsumerClosed(MessageConsumer consumer, Throwable cause) {}

        @Override
        public void onProducerClosed(MessageProducer producer, Throwable cause) {}
    };

    /**
     * password签名计算方法，请参见阿里云文档：AMQP客户端接入说明。
     */
    private static String doSign(String toSignString, String secret, String signMethod) throws Exception {
        SecretKeySpec signingKey = new SecretKeySpec(secret.getBytes(), signMethod);
        Mac mac = Mac.getInstance(signMethod);
        mac.init(signingKey);
        byte[] rawHmac = mac.doFinal(toSignString.getBytes());
        return Base64.encodeBase64String(rawHmac);
    }
}

3服务端发布

package com.ali.amqp.publish;

import com.ali.amqp.subscribe.AmqpJavaClient;
import com.aliyuncs.DefaultAcsClient;
import com.aliyuncs.IAcsClient;
import com.aliyuncs.iot.model.v20180120.PubRequest;
import com.aliyuncs.iot.model.v20180120.PubResponse;
import com.aliyuncs.profile.DefaultProfile;
import org.apache.commons.codec.binary.Base64;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.*;
import java.net.Socket;
import java.nio.charset.StandardCharsets;
import java.text.SimpleDateFormat;

/**
 * 云端下发消息
 */
public class PopPubServer {
    private final static Logger logger = LoggerFactory.getLogger(PopPubServer.class);


    public static boolean sendToTopic(String topic) throws UnsupportedEncodingException {
        String regionId = "cn-shanghai";
        String accessKey = "你的accessKey";
        String accessSecret = "你的accessSecret";
        final String productKey = "设备productKey";
        //设置client的参数
        DefaultProfile profile = DefaultProfile.getProfile(regionId, accessKey, accessSecret);
        IAcsClient autoClient = new DefaultAcsClient(profile);
        PubRequest request = new PubRequest();
        request.setQos(0);
        //设置发布消息的topic
        request.setTopicFullName("/a14UPaWxJCF/test_device/user/test");
        request.setProductKey(productKey);
        //设置消息的内容，一定要用base64编码，否则乱码
        Base64 base64 = new Base64();
        request.setMessageContent(base64.encodeToString("hello".getBytes("UTF-8")));
        try {
            PubResponse response = autoClient.getAcsResponse(request);
            Boolean success = response.getSuccess();
            return success;
        } catch (Exception e) {
           logger.warn("阿里云消息发送异常，topic:{},异常信息：{}",topic,e.getMessage());
           return false;
        }
    }
}