如题，不废话了，直接上java代码。这个获取的IP段是最新的国内IP段。
import java.io.*;import java.net.HttpURLConnection;import java.net.URL;import java.util.HashMap;import java.util.Map;/** * Description * Date: 2019/6/12 15:32 * Created by jonhy_love */class GetAPNIC { public static void main(String []args) { Map<String,String> map = request("http://ftp.apnic.net/apnic/stats/apnic/delegated-apnic-latest"); System.out.println(parseOnline(map.get("result"))); } /** * 在线解析 * @param str1 * @return */ private static String parseOnline(String str1){ String lists[] = str1.split("n"); StringBuilder sb = new StringBuilder(); try { for (String str:lists) { if (str.startsWith("apnic") && str.contains("|CN|ipv4|")){ String a[] = str.split("\|"); Integer mask = 32-(int)(Math.log(Double.valueOf(a[4]))/Math.log(2)); sb.append(a[3]).append("/").append(mask).append('n'); } } } catch (Exception e) { e.printStackTrace(); } return sb.toString(); } private static Map<String,String> request(String url) { Map<String,String> response = new HashMap<String, String>(); try{ URL obj = new URL(url); HttpURLConnection con = (HttpURLConnection) obj.openConnection(); //设置请求方式 con.setRequestMethod("GET"); con.setDoOutput(true); int responseCode = con.getResponseCode(); response.put("code",responseCode + ""); if (responseCode == 200) { BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream())); String inputLine; StringBuffer responseBuffer = new StringBuffer(); while((inputLine = in.readLine())!=null){ responseBuffer.append(inputLine).append("n"); } in.close(); response.put("result",responseBuffer.toString()); }else{ response.put("result",""); } }catch (Exception e){ response.put("result","failed"); } return response; }}将上述代码复制到剪辑版，进入在线运行网站：http://www.dooccn.com/java/
粘贴代码，点击run即可。
效果如下：
这样就可以随时方便在线获取国内IP段用作路由规则了。
参考来源：
代码在线运行网站
https://blog.csdn.net/u014549283/article/details/81780992
Apnic IP地址段的获取与整理方法介绍
https://blog.csdn.net/nullzeng/article/details/17538009