AMQP：企业服务器通过 AMQP 接入物联网平台血泪史

今天药忘吃喽~ 2023-10-05 08:44 77阅读 0赞

##### 一、基础 #####

数据流向  
![在这里插入图片描述][20200819102034532.png_pic_center]  
需要创建设备的参考阿里云提供的官方文档

##### 二、环境搭建 #####

简单说一下搭建流程

①、创建边缘实例和网关  
参考[https://help.aliyun.com/document\_detail/102729.html?spm=a2c4g.11186623.6.561.119c71b8Mji3Oj][https_help.aliyun.com_document_detail_102729.html_spm_a2c4g.11186623.6.561.119c71b8Mji3Oj]

②、安装并启动Link IoT Edge  
参考[https://help.aliyun.com/document\_detail/102729.html?spm=a2c4g.11186623.6.561.119c71b8Mji3Oj][https_help.aliyun.com_document_detail_102729.html_spm_a2c4g.11186623.6.561.119c71b8Mji3Oj]

③、新建产品及设备并接入边缘计算  
[https://help.aliyun.com/document\_detail/73728.html?spm=a2c4g.11186623.6.577.7d74719f3ZA4Yp][https_help.aliyun.com_document_detail_73728.html_spm_a2c4g.11186623.6.577.7d74719f3ZA4Yp]

④、使用AMQP客户端接入  
[https://help.aliyun.com/document\_detail/142489.html?spm=a2c4g.11186623.6.623.6fdf31b4lpXgJC][https_help.aliyun.com_document_detail_142489.html_spm_a2c4g.11186623.6.623.6fdf31b4lpXgJC]

##### 三、核心实现 #####

下面主要说一下AMQP客户端获取服务端消息过程中遇到的错误

贴出阿里云提供的核心代码，其中accessKey 以及 accessSecret 一定要使用主账号或者授权物联网平台的RAM子账号，consumerGroupId你创建的消费组id，clientId 自定义，保证全局唯一就行

package org.example;
    
    import java.net.URI;
    import java.util.Hashtable;
    import java.util.concurrent.ExecutorService;
    import java.util.concurrent.LinkedBlockingQueue;
    import java.util.concurrent.ThreadPoolExecutor;
    import java.util.concurrent.TimeUnit;
    import javax.crypto.Mac;
    import javax.crypto.spec.SecretKeySpec;
    import javax.jms.Connection;
    import javax.jms.ConnectionFactory;
    import javax.jms.Destination;
    import javax.jms.Message;
    import javax.jms.MessageConsumer;
    import javax.jms.MessageListener;
    import javax.jms.MessageProducer;
    import javax.jms.Session;
    import javax.naming.Context;
    import javax.naming.InitialContext;
    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;
    
    public class AmqpJavaClientDemo {
        
    /*    {
            "ProductKey": "a102d8wPapF",
                "DeviceName": "temperature",
                "DeviceSecret": "2a705d209e71a1d91e2ed8a2a5f84c4c"
        }*/
    private final static Logger logger = LoggerFactory.getLogger(AmqpJavaClientDemo.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));
    
    //
    //jumdwqMHeKwL8uCePjmhKccnyVAkeR
        public static void main(String[] args) throws Exception {
        
                //参数说明，请参见AMQP客户端接入说明文档。
            String accessKey = "${YourAccessKey}";
            String accessSecret = "${YourAccessSecret}";
            String consumerGroupId = "${YourConsumerGroupId}";
            //iotInstanceId：购买的实例请填写实例ID，公共实例请填空字符串""。
            String iotInstanceId = "${YourIotInstanceId}";
            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 = "192.168.20.72";
    
            //userName组装方法，请参见AMQP客户端接入说明文档。
            String userName = clientId + "|authMode=aksign"
                    + ",signMethod=" + signMethod
                    + ",timestamp=" + timeStamp
                    + ",authId=" + accessKey
                    + ",iotInstanceId=" + iotInstanceId
                    + ",consumerGroupId=" + consumerGroupId
                    + "|";
            //计算签名，password组装方法，请参见AMQP客户端接入说明文档。
            String signContent = "authId=" + accessKey + "&timestamp=" + timeStamp;
            String password = doSign(signContent,accessSecret, signMethod);
            //接入域名，请参见AMQP客户端接入说明文档。
            String connectionUrl = "failover:(amqps://${YourHost}: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 {
        
                    //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(() -> processMessage(message));
                } catch (Exception e) {
        
                    logger.error("submit task occurs exception ", e);
                }
            }
        };
    
        /**
         * 在这里处理您收到消息后的具体业务逻辑。
         */
        private static void processMessage(Message message) {
        
            try {
        
                byte[] body = message.getBody(byte[].class);
                String content = new String(body);
                String topic = message.getStringProperty("topic");
                String messageId = message.getStringProperty("messageId");
                logger.info("receive message"
                        + ", topic = " + topic
                        + ", messageId = " + messageId
                        + ", content = " + content);
            } catch (Exception e) {
        
                logger.error("processMessage occurs error ", 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) {
        }
        };
    
        /**
         * 计算签名，password组装方法，请参见AMQP客户端接入说明文档。
         */
        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);
        }
    }

##### 四、遇到的错误 #####

以下错误你们可能不会遇到，我在创建maven项目时使用的是 javaSE 原型项目，如果你选择其他原型项目可能不会遇到，对 maven 原型项目不了解的可以查看我另一篇博客

[https://blog.csdn.net/qq\_41538097/article/details/108010241][https_blog.csdn.net_qq_41538097_article_details_108010241]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNTM4MDk3_size_16_color_FFFFFF_t_70_pic_center]

###### 1、错误一 ######

Lambda expressions are not supported at language level '7'

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNTM4MDk3_size_16_color_FFFFFF_t_70_pic_center 1]  
解决办法，将 language level 换成 8 及以上支持 Lamdbas 的版本（最好是8），按照如下顺序找到切换

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNTM4MDk3_size_16_color_FFFFFF_t_70_pic_center 2]

###### 2、错误二 ######

Error:java: Compilation failed: internal java compiler error

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNTM4MDk3_size_16_color_FFFFFF_t_70_pic_center 3]  
**错误原因**

导致这个错误的原因主要是因为jdk版本问题，此处有两个原因，一个是编译版本不匹配，一个是当前项目jdk版本不支持。

**解决办法**

①、查看项目 jdk

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNTM4MDk3_size_16_color_FFFFFF_t_70_pic_center 4]  
②、查看工程 jdk

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNTM4MDk3_size_16_color_FFFFFF_t_70_pic_center 5]  
③、查看java编译器版本

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNTM4MDk3_size_16_color_FFFFFF_t_70_pic_center 6]  
必须保证上面三个信息相同，即需要修改Java编译器版本，修改为如下所示

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNTM4MDk3_size_16_color_FFFFFF_t_70_pic_center 7]

###### 3、问题三 ######

Client failed to authenticate using SASL: PLAIN

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNTM4MDk3_size_16_color_FFFFFF_t_70_pic_center 8]  
**错误原因**

根据错误提示可以看出 client 建立连接失败，即参数配置错误，重新检查了一遍错误，发现都正确，最后想可能是使用 RAM 子账户的 accessKey 以及 accessSecret 没有分配权限

**解决办法**

在阿里云控制台将子账户加入了用户组，给用户组分配权限，或者你直接使用主账户的 accessKey 以及accessSecret 就不会出现权限问题。

###### 4、问题四 ######

Failed to load class "org.slf4j.impl.StaticLoggerBinder".

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNTM4MDk3_size_16_color_FFFFFF_t_70_pic_center 9]  
**错误原因**

缺少org.slf4j.impl.StaticLoggerBinder包

**解决办法**

在 pom 文件中加入如下内容

<dependency>
          <groupId>org.slf4j</groupId>
          <artifactId>slf4j-simple</artifactId>
          <version>1.7.25</version>
          <scope>compile</scope>
        </dependency>

##### 五、测试 #####

1、启动 Link IoT Edge 服务

![在这里插入图片描述][20200819112245580.png_pic_center]  
2、运行程序，成功接收消息

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxNTM4MDk3_size_16_color_FFFFFF_t_70_pic_center 10]  
环境搭建不清楚的或对哪块不理解的，评论告诉我，看有没有必要写环境搭建部分。

[20200819102034532.png_pic_center]: https://img-blog.csdnimg.cn/20200819102034532.png#pic_center
[https_help.aliyun.com_document_detail_102729.html_spm_a2c4g.11186623.6.561.119c71b8Mji3Oj]: https://help.aliyun.com/document_detail/102729.html?spm=a2c4g.11186623.6.561.119c71b8Mji3Oj
[https_help.aliyun.com_document_detail_73728.html_spm_a2c4g.11186623.6.577.7d74719f3ZA4Yp]: https://help.aliyun.com/document_detail/73728.html?spm=a2c4g.11186623.6.577.7d74719f3ZA4Yp
[https_help.aliyun.com_document_detail_142489.html_spm_a2c4g.11186623.6.623.6fdf31b4lpXgJC]: https://help.aliyun.com/document_detail/142489.html?spm=a2c4g.11186623.6.623.6fdf31b4lpXgJC
[https_blog.csdn.net_qq_41538097_article_details_108010241]: https://blog.csdn.net/qq_41538097/article/details/108010241
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[20200819112245580.png_pic_center]: https://img-blog.csdnimg.cn/20200819112245580.png#pic_center
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