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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>                <dependency>            <groupId>com.squareup.retrofit2groupId>            <artifactId>retrofitartifactId>            <version>2.2.0version>        dependency>                <dependency>            <groupId>com.squareup.retrofit2groupId>            <artifactId>converter-gsonartifactId>            <version>2.2.0version>        dependency>                <dependency>            <groupId>com.squareup.okhttp3groupId>            <artifactId>okhttpartifactId>            <version>3.7.0version>        dependency>        <dependency>            <groupId>com.aliyungroupId>            <artifactId>aliyun-java-sdk-alidnsartifactId>            <version>2.0.1version>        dependency>        <dependency>            <groupId>com.aliyungroupId>            <artifactId>aliyun-java-sdk-coreartifactId>            <version>3.5.0version>        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.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;    

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