本代码的实现前提：
1.拥有阿里云域名，且获取了Access Key 及 Access Secret
2.能获取外网IP的页面地址（注意：ip138.com的实际包含ip地址为http://2018.ip138.com/ic.asp）
Maven依赖项：
1 <dependencies> 2 <!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpclient --> 3 <dependency> 4 <groupId>org.apache.httpcomponents</groupId> 5 <artifactId>httpclient</artifactId> 6 <version>4.5.5</version> 7 </dependency> 8 9 <!-- https://mvnrepository.com/artifact/com.google.code.gson/gson --> 10 <dependency> 11 <groupId>com.google.code.gson</groupId> 12 <artifactId>gson</artifactId> 13 <version>2.8.5</version> 14 </dependency> 15 16 <!-- https://mvnrepository.com/artifact/com.aliyun/aliyun-java-sdk-core --> 17 <dependency> 18 <groupId>com.aliyun</groupId> 19 <artifactId>aliyun-java-sdk-core</artifactId> 20 <version>4.0.2</version> 21 </dependency> 22 23 <dependency> 24 <groupId>com.aliyun</groupId> 25 <artifactId>aliyun-java-sdk-alidns</artifactId> 26 <version>2.0.6</version> 27 </dependency> 28 29 </dependencies>
代码：
package com.phipsoft.aliyun.ddns; import java.io.BufferedReader; import java.io.InputStreamReader; import java.net.URL; import java.net.URLConnection; import java.util.HashMap; import java.util.Map; import java.util.regex.Matcher; import java.util.regex.Pattern; 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.DescribeDomainRecordsResponse.Record; import com.aliyuncs.alidns.model.v20150109.UpdateDomainRecordRequest; import com.aliyuncs.alidns.model.v20150109.UpdateDomainRecordResponse; import com.aliyuncs.profile.DefaultProfile; import com.aliyuncs.profile.IClientProfile; public class DDNS { static final String CHARSET_ENCONDING = "utf-8"; static final String KEY_IP_URL = "-url"; static final String KEY_IP_REGEX_PATTERN = "-reg"; static final String KEY_ACCESS_KEY = "-k"; static final String KEY_ACCESS_SECRET = "-s"; static final String KEY_DOMAIN = "-d"; static final String KEY_RR = "-rr"; public static String sendGet(String url, String param) { String result = ""; BufferedReader in = null; try { String urlNameString = url + ((param == null || param.isEmpty())? "" : ("?" + param)); URL realUrl = new URL(urlNameString); // 打开和URL之间的连接 URLConnection connection = realUrl.openConnection(); // 设置通用的请求属性 connection.setRequestProperty("accept", "*/*"); connection.setRequestProperty("connection", "Keep-Alive"); connection.setRequestProperty("contentType", CHARSET_ENCONDING); connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)"); // 建立实际的连接 connection.connect(); in = new BufferedReader(new InputStreamReader(connection.getInputStream(), CHARSET_ENCONDING)); 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(); } } return result; } private static final String getInternetIP(String url, String regexPattern) { String ret = null; String html = sendGet(url, null); Pattern pattern = Pattern.compile(regexPattern); Matcher matcher = pattern.matcher(html); if(matcher.find()) { ret = matcher.group(0); } return ret; } private static void updateIP(Map<String, String> config) throws Exception { String ip = null; if(config.containsKey(KEY_IP_URL) && config.containsKey(KEY_IP_REGEX_PATTERN)) { ip = getInternetIP(config.get(KEY_IP_URL), config.get(KEY_IP_REGEX_PATTERN)); }else { throw new RuntimeException("获取外网ip的参数不足"); } IClientProfile clientProfile = DefaultProfile.getProfile("cn-hangzhou", config.get(KEY_ACCESS_KEY), config.get(KEY_ACCESS_SECRET)); IAcsClient client = new DefaultAcsClient(clientProfile); DescribeDomainRecordsRequest request = new DescribeDomainRecordsRequest(); request.setDomainName(config.get(KEY_DOMAIN)); DescribeDomainRecordsResponse response; boolean flag = false; response = client.getAcsResponse(request); for(Record record : response.getDomainRecords()) { if(record.getRR().equalsIgnoreCase(config.get(KEY_RR))&&record.getType().equalsIgnoreCase("A")) { String old_ip = record.getValue(); String cur_ip = ip; flag = true; if(!old_ip.equals(cur_ip)){ UpdateDomainRecordRequest udr_req = new UpdateDomainRecordRequest(); udr_req.setValue(cur_ip); udr_req.setType(record.getType()); udr_req.setTTL(record.getTTL()); udr_req.setPriority(record.getPriority()); udr_req.setLine(record.getLine()); udr_req.setRecordId(record.getRecordId()); udr_req.setRR(record.getRR()); UpdateDomainRecordResponse udr_resp = client.getAcsResponse(udr_req); System.out.println(udr_resp.toString()); }else{ System.out.println("不需要修改"); } } } if(flag == false) { throw new RuntimeException("无法找到RR="+config.get(KEY_RR)); } } private static Map<String,String> parseArgs(String[] args){ Map<String,String> ret = new HashMap<String, String>(); for(int i=0;i<args.length;) { if(args[i].startsWith("-")) { ret.put(args[i], args[i+1]); i+=2; }else { i++; } } return ret; } /** * -k xxx -s xxxx -d xxx.cn -rr www -url xxxx -reg (\d+\.){3}\d+ * @param args */ public static void main(String[] args) { try{ Map<String,String> config = parseArgs(args); updateIP(config); }catch(Exception e){ System.out.println(e); } } }
以上代码为简化运行环境，参数没做更多正确性检验， 生成可执行jar包， 通过命令行参数即可实现动态域名解析。再放入计划任务，自动更新……