前景说明：

你有一个阿里云的域名，想让它解析到你家用宽带动态ip上。

解决思路：

1、定时查看宽带的ip；

2、发现变化时，通过阿里云提供的sdk修改域名解析。

一、阿里云控制台创建AccessKey

官方文档：创建阿里云AccessKey_访问控制(RAM)-阿里云帮助中心 (aliyun.com)

二、阿里云 云解析

官方文档：云解析_SDK中心-阿里云OpenAPI开发者门户 (aliyun.com)

官方接口：UpdateDomainRecord_云解析_API调试-阿里云OpenAPI开发者门户 (aliyun.com)

DescribeDomainRecordInfo_云解析_API调试-阿里云OpenAPI开发者门户

三、上代码

1、pom.xml引包

   <dependencies><dependency><groupId>com.aliyun</groupId><artifactId>alidns20150109</artifactId><version>3.1.0</version></dependency><dependency><groupId>com.aliyun</groupId><artifactId>credentials-java</artifactId><version>0.3.0</version></dependency></dependencies>

2、获取外网ip的方法

package com.chhuang;import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.*;
import java.util.regex.Pattern;public class ExternalIPUtil {/*** IP 地址校验的正则表达式*/private static final Pattern IPV4_PATTERN = Pattern.compile("^(([01]?\\d\\d?|2[0-4]\\d|25[0-5])\\.){3}([01]?\\d\\d?|2[0-4]\\d|25[0-5])$");/*** 获取 IP 地址的服务列表*/private static final String[] IPV4_SERVICES = {"http://checkip.amazonaws.com/","https://ipv4.icanhazip.com/","http://bot.whatismyipaddress.com/"// and so on ...};//    线程池的 ExecutorService.invokeAny(callables) 方法用于并发执行多个线程，并拿到最快的执行成功的线程的返回值，
//    只要有一个执行成功，其他失败的任务都会忽略。但是如果全部失败，
//    例如本机根本就没有连外网，那么就会抛出 ExecutionException 异常。public static String get() throws ExecutionException, InterruptedException {List<Callable<String>> callables = new ArrayList<>();for (String ipService : IPV4_SERVICES) {callables.add(() -> get(ipService));}ExecutorService executorService = Executors.newCachedThreadPool();try {// 返回第一个成功获取的 IPreturn executorService.invokeAny(callables);} finally {executorService.shutdown();}}private static String get(String url) throws IOException {try (BufferedReader in = new BufferedReader(new InputStreamReader(new URL(url).openStream()))) {String ip = in.readLine();if (IPV4_PATTERN.matcher(ip).matches()) {return ip;} else {throw new IOException("invalid IPv4 address: " + ip);}}}
}

3、使用云解析

package com.chhuang;import com.aliyun.alidns20150109.Client;
import com.aliyun.alidns20150109.models.DescribeDomainRecordInfoRequest;
import com.aliyun.alidns20150109.models.DescribeDomainRecordInfoResponse;
import com.aliyun.alidns20150109.models.UpdateDomainRecordRequest;
import com.aliyun.tea.TeaException;
import com.aliyun.teaopenapi.models.Config;
import com.aliyun.teautil.Common;
import com.aliyun.teautil.models.RuntimeOptions;import java.util.Random;/*** Hello world!**/
public class App {private static final String APP_ALIBABA_ID = "你自己的ALIBABA_CLOUD_ACCESS_KEY_ID";private static final String SECURITY_ALIBABA_KEY = "你自己的ALIBABA_CLOUD_ACCESS_KEY_SECRET";/*** 使用AK&SK初始化账号Client* @return Client* @throws Exception*/public static Client createClient() throws Exception {// 工程代码泄露可能会导致 AccessKey 泄露，并威胁账号下所有资源的安全性。以下代码示例仅供参考。// 建议使用更安全的 STS 方式，更多鉴权访问方式请参见：https://help.aliyun.com/document_detail/378657.html。Config config = new Config().setAccessKeyId(APP_ALIBABA_ID).setAccessKeySecret(SECURITY_ALIBABA_KEY);// Endpoint 请参考 https://api.aliyun.com/product/Alidnsconfig.endpoint = "alidns.cn-hangzhou.aliyuncs.com";return new Client(config);}public static void main( String[] args ) throws Exception {while (true) {Random random = new Random();Thread.sleep((random.nextInt(600) + 600) * 1000);// 获取外网ipString ip = ExternalIPUtil.get();System.out.println("ip=" + ip);// 更新域名解析updateDomain(ip);}}private static void updateDomain(String ip) throws Exception {Client client = App.createClient();// 获取解析记录的详细信息DescribeDomainRecordInfoRequest describeDomainRecordInfoRequest = new DescribeDomainRecordInfoRequest().setRecordId("你自己域名解析记录的recordId");RuntimeOptions runtime = new RuntimeOptions();try {// 复制代码运行请自行打印 API 的返回值DescribeDomainRecordInfoResponse response = client.describeDomainRecordInfoWithOptions(describeDomainRecordInfoRequest, runtime);String value = response.getBody().getValue();// 判断 ip 是否需要修改if (!ip.equals(value)) {UpdateDomainRecordRequest updateDomainRecordRequest = new UpdateDomainRecordRequest().setRecordId("你自己域名解析记录的recordId") // 通过阿里云后台，DescribeDomainRecords 获取解析记录.setRR("www").setType("A").setValue(ip).setTTL(600L);// 复制代码运行请自行打印 API 的返回值client.updateDomainRecordWithOptions(updateDomainRecordRequest, runtime);}} catch (TeaException error) {// 此处仅做打印展示，请谨慎对待异常处理，在工程项目中切勿直接忽略异常。// 错误 messageerror.printStackTrace();// 诊断地址System.out.println(error.getData().get("Recommend"));Common.assertAsString(error.message);} catch (Exception _error) {_error.printStackTrace();TeaException error = new TeaException(_error.getMessage(), _error);// 此处仅做打印展示，请谨慎对待异常处理，在工程项目中切勿直接忽略异常。// 诊断地址System.out.println(error.getData().get("Recommend"));Common.assertAsString(error.message);}}
}