1.如果不想用花生壳这类的工具，可以利用阿里云的动态域名解析api来动态解析域名。 2.原理就是定期检查ip是否改变，如果改变就利用api重新解析域名
一、pom.xml
<dependencies> <!--retrofit--> <dependency> <groupId>com.squareup.retrofit2</groupId> <artifactId>retrofit</artifactId> <version>2.2.0</version> </dependency> <!-- https://mvnrepository.com/artifact/com.squareup.retrofit/converter-gson --> <dependency> <groupId>com.squareup.retrofit2</groupId> <artifactId>converter-gson</artifactId> <version>2.2.0</version> </dependency> <!--ok-http--> <dependency> <groupId>com.squareup.okhttp3</groupId> <artifactId>okhttp</artifactId> <version>3.7.0</version> </dependency> <dependency> <groupId>com.aliyun</groupId> <artifactId>aliyun-java-sdk-alidns</artifactId> <version>2.0.1</version> </dependency> <dependency> <groupId>com.aliyun</groupId> <artifactId>aliyun-java-sdk-core</artifactId> <version>3.5.0</version> </dependency> </dependencies>二、
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.profile.DefaultProfile; import com.aliyuncs.profile.IClientProfile; import http.RetroFitHelper; import java.util.List; public class start { private static IAcsClient client = null; static { String regionId = "cn-hangzhou"; //必填固定值，必须为“cn-hanghou” String accessKeyId = ""; // your accessKey String accessKeySecret = "";// your accessSecret //或者设置为空，然后下边有从阿里云获取的方法，只是不建议每次都去阿里云获取。 IClientProfile profile = DefaultProfile.getProfile(regionId, accessKeyId, accessKeySecret); // 若报Can not find endpoint to access异常，请添加以下此行代码 // DefaultProfile.addEndpoint("cn-hangzhou", "cn-hangzhou", "Alidns", "alidns.aliyuncs.com"); client = new DefaultAcsClient(profile); } public static void main(String[] args) throws Exception { String domain = "xxx.com"; //顶级域名 String rr = "yyy";//子域名 DescribeDomainRecordsResponse.Record record = GetRecordId(domain, rr); String recordId = record.getRecordId(); String ip = record.getValue(); if (recordId==null|| recordId == "") return; if (ip==null|| ip == "") return; String curIp = RetroFitHelper.getCurIp(); //获取对外ip地址 if (!ip.equals(curIp)){ UpdateDomainRecordRequest request = new UpdateDomainRecordRequest(); request.setRecordId(recordId); request.setRR(record.getRR()); request.setType(record.getType()); request.setValue(curIp); request.setTTL(record.getTTL()); request.setLine(record.getLine()); request.setPriority(10l); UpdateDomainRecordResponse response = client.getAcsResponse(request); System.out.println(response.getRecordId()); } } private static DescribeDomainRecordsResponse.Record GetRecordId(String domainString,String rr) { DescribeDomainRecordsRequest request = new DescribeDomainRecordsRequest(); request.setDomainName(domainString); request.setRRKeyWord(rr); DescribeDomainRecordsResponse response; // describeRegionsRequest.setProtocol(ProtocolType.HTTPS); //指定访问协议 // describeRegionsRequest.setAcceptFormat(FormatType.JSON); //指定api返回格式 // describeRegionsRequest.setMethod(MethodType.POST); //指定请求方法 // describeRegionsRequest.setRegionId("cn-hangzhou");//指定要访问的Region,仅对当前请求生效，不改变client的默认设置。 try { response = client.getAcsResponse(request); List<DescribeDomainRecordsResponse.Record> list = response.getDomainRecords(); for (DescribeDomainRecordsResponse.Record record : list) { if (domainString.equals(record.getDomainName()) && rr.equals(record.getRR())) { return record; } } } catch (Exception e) { e.printStackTrace(); } return null; } }