本教程详细介绍如何使用Alibaba Cloud SDK for Java实现动态域名解析(DDNS)。

前提条件

在使用本教程前,请确保已完成以下操作:

  • 使用Alibaba Cloud SDK for Java,您需要一个阿里云账号和访问密钥(AccessKey)。 请在阿里云控制台中的AccessKey管理页面上创建和查看您的AccessKey。
  • 确保您已经安装了Alibaba Cloud SDK for Java,准确的SDK版本号,请参见阿里云开发工具包(SDK)
    <dependencies>      <!-- https://mvnrepository.com/artifact/com.aliyun/aliyun-java-sdk-core --&gt;      <dependency&gt;          <groupId>com.aliyun</groupId>          <artifactId>aliyun-java-sdk-core</artifactId>          <version>4.4.3</version>      </dependency>      <!-- https://mvnrepository.com/artifact/com.aliyun/aliyun-java-sdk-alidns -->      <dependency>          <groupId>com.aliyun</groupId>          <artifactId>aliyun-java-sdk-alidns</artifactId>          <version>2.0.10</version>      </dependency> </dependencies>

代码示例

本文操作示例主要以代码形式体现,具体代码如下:

import com.aliyuncs.DefaultAcsClient; import com.aliyuncs.IAcsClient; import com.aliyuncs.alidns.model.v20150109.DescribeDomainRecordsRequest; import com.aliyuncs.alidns.model.v20150109.DescribeDomainRecordsResponse; import com.aliyuncs.alidns.model.v20150109.UpdateDomainRecordRequest; import com.aliyuncs.alidns.model.v20150109.UpdateDomainRecordResponse; import com.aliyuncs.exceptions.ClientException; import com.aliyuncs.profile.DefaultProfile; import com.google.gson.Gson;  import java.io.BufferedReader; import java.io.InputStreamReader; import java.net.HttpURLConnection; import java.net.URL; import java.util.List; import java.util.regex.Matcher; import java.util.regex.Pattern;  /**  * 动态域名解析  */ public class DDNS {      /**      * 获取主域名的所有解析记录列表      */     private DescribeDomainRecordsResponse describeDomainRecords(DescribeDomainRecordsRequest request, IAcsClient client){         try {             // 调用SDK发送请求             return client.getAcsResponse(request);         } catch (ClientException e) {             e.printStackTrace();             // 发生调用错误,抛出运行时异常             throw new RuntimeException();         }     }      /**      * 获取当前主机公网IP      */     private String getCurrentHostIP(){         // 这里使用jsonip.com第三方接口获取本地IP         String jsonip = "https://jsonip.com/";         // 接口返回结果         String result = "";         BufferedReader in = null;         try {             // 使用HttpURLConnection网络请求第三方接口             URL url = new URL(jsonip);             HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();             urlConnection.setRequestMethod("GET");             urlConnection.connect();             in = new BufferedReader(new InputStreamReader(                     urlConnection.getInputStream()));             String line;             while ((line = in.readLine()) != null) {                 result += line;             }         } catch (Exception e) {             e.printStackTrace();         }         // 使用finally块来关闭输入流         finally {             try {                 if (in != null) {                     in.close();                 }             } catch (Exception e2) {                 e2.printStackTrace();             }          }         // 正则表达式,提取xxx.xxx.xxx.xxx,将IP地址从接口返回结果中提取出来         String rexp = "(\d{1,3}\.){3}\d{1,3}";         Pattern pat = Pattern.compile(rexp);         Matcher mat = pat.matcher(result);         String res="";         while (mat.find()) {             res=mat.group();             break;         }         return res;     }      /**      * 修改解析记录      */     private UpdateDomainRecordResponse updateDomainRecord(UpdateDomainRecordRequest request, IAcsClient client){         try {             // 调用SDK发送请求             return client.getAcsResponse(request);         } catch (ClientException e) {             e.printStackTrace();             // 发生调用错误,抛出运行时异常             throw new RuntimeException();         }     }      private static void log_print(String functionName, Object result) {         Gson gson = new Gson();         System.out.println("-------------------------------" + functionName + "-------------------------------");         System.out.println(gson.toJson(result));     }      public static void main(String[] args) {         // 设置鉴权参数,初始化客户端         DefaultProfile profile = DefaultProfile.getProfile(                 "cn-qingdao",// 地域ID                 "your-access-key-id",// 您的AccessKey ID                 "your-access-key-secret");// 您的AccessKey Secret         IAcsClient client = new DefaultAcsClient(profile);          DDNS ddns = new DDNS();          // 查询指定二级域名的最新解析记录         DescribeDomainRecordsRequest describeDomainRecordsRequest = new DescribeDomainRecordsRequest();         // 主域名         describeDomainRecordsRequest.setDomainName("example.com");         // 主机记录         describeDomainRecordsRequest.setRRKeyWord("ddnstest");         // 解析记录类型         describeDomainRecordsRequest.setType("A");         DescribeDomainRecordsResponse describeDomainRecordsResponse = ddns.describeDomainRecords(describeDomainRecordsRequest, client);         log_print("describeDomainRecords",describeDomainRecordsResponse);          List<DescribeDomainRecordsResponse.Record> domainRecords = describeDomainRecordsResponse.getDomainRecords();         // 最新的一条解析记录         if(domainRecords.size() != 0 ){             DescribeDomainRecordsResponse.Record record = domainRecords.get(0);             // 记录ID             String recordId = record.getRecordId();             // 记录值             String recordsValue = record.getValue();             // 当前主机公网IP             String currentHostIP = ddns.getCurrentHostIP();             System.out.println("-------------------------------当前主机公网IP为:"+currentHostIP+"-------------------------------");             if(!currentHostIP.equals(recordsValue)){                 // 修改解析记录                 UpdateDomainRecordRequest updateDomainRecordRequest = new UpdateDomainRecordRequest();                 // 主机记录                 updateDomainRecordRequest.setRR("ddnstest");                 // 记录ID                 updateDomainRecordRequest.setRecordId(recordId);                 // 将主机记录值改为当前主机IP                 updateDomainRecordRequest.setValue(currentHostIP);                 // 解析记录类型                 updateDomainRecordRequest.setType("A");                 UpdateDomainRecordResponse updateDomainRecordResponse = ddns.updateDomainRecord(updateDomainRecordRequest, client);                 log_print("updateDomainRecord",updateDomainRecordResponse);             }         }     } }

运行结果

正确运行结果类似如下:

-------------------------------describeDomainRecords------------------------------- {     "requestId": "6AE588B9-FAFA-45FE-8FBE-CACB196D3539",     "totalCount": 1,     "pageNumber": 1,     "pageSize": 20,     "domainRecords": [         {             "domainName": "example.com",             "recordId": "1846657850481xxxx",             "rR": "ddnstest",             "type": "A",             "value": "1.1.1.1",             "tTL": 600,             "line": "default",             "status": "ENABLE",             "locked": false,             "weight": 1         }     ] } -------------------------------当前主机公网IP为:123.123.123.123------------------------------- -------------------------------updateDomainRecord------------------------------- {     "requestId": "08DC052F-7DF7-4451-8214-8489EC15D96A",     "recordId": "1846657850481xxxx" }