如何在Java中检查子域的有效性? [英] How to check validity of a subdomain in java?

问题描述

我有一个域abc.jp

例如:
我想检查是否有效，可以在此示例中添加另一个子域.怎么做?如果可能，请上传一些Java代码作为参考吗?

谢谢

I have a domain abc.jp

For example:
I want to check if this is valid to that I can add another sublevel domain to this example. How to do it? If possible, upload some java codes as reference please?

Thank you

推荐答案

您的示例ac.jp是有效域，但不是IP可解析域.因此，我建议使用Whois服务器.如果要检查所有域，则需要保留许多Whois服务器.如果您仅在日本使用，则下面的代码片段应该可以使用™.

Your example ac.jp is a valid domain, but not an IP resolvable domain. So I would suggest a whois server. You would need to keep a number of whois servers if you want to check all domains. If you only do Japan then the below snippet should work™.

import org.apache.commons.net.whois.*;

public class Main {
    public static void main(String[] args) {
        WhoisClient whois = new WhoisClient();
        String whoishost = "whois.jprs.jp";
       // String whoishost = "whois.verisign-grs.com"; // for .com domains
        String domain = "ac.jp";
        try {
            whois.connect(whoishost);
            String whoisData = whois.query(domain);
            if (whoisData.toUpperCase().contains("NO MATCH")){
                System.out.println("Domain is not registered. According to whoishost: " + whoishost);
            }
            else{
                System.out.println("Domain is registered. According to whoishost: " + whoishost);
            }
        } catch (java.io.IOException ioex) {
            System.out.println("failed");
        }
    }
}

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