如何在Java中检查域是否存在？ [英] How can you check whether domain exists or not in Java?

问题描述

假设我的电子邮件地址是 [e-mail] ，我想检查 yahoo.com 是否是是否有效域。

Suppose my email address is [e-mail] and I want to check if yahoo.com is a valid domain or not.

有谁能告诉我我可以使用哪种Java API？

Can anyone tell me which Java API I can use for this?

推荐答案

InetAddress 有 getByName（） 方法确定主机的IP地址，鉴于主持人的名字。

InetAddress has getByName() method to determine the IP address of a host, given the host's name.

如果找不到主机的IP地址（如果给定的主机名无效）， 将抛出UnknownHostException 。

If no IP address for the host could be found ( in case the given host name is not valid) , UnknownHostException will be thrown.

因此，您只需在调用 InetAddress.getByName（）时尝试捕获 UnknownHostException 。如果捕获到 UnknownHostException ，则表示您的输入主机名无效。

So , you just try to catch an UnknownHostException when calling InetAddress.getByName() . If UnknownHostException is caught , that means your input host name is invalid.

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