我使用java API根据给定的URL提取第二个域名。
https://github.com/whois-server-list/public-suffix-list
它基于Mozilla的PUBLIC SUFFIX LIST
。
考虑以下代码:
PublicSuffixListFactory factory = new PublicSuffixListFactory();
PublicSuffixList suffixList = factory.build();
String[] domainArray = new String[10];
domainArray[0] = "swcdn.apple.com";
domainArray[1] = "production-pdt.siriusxm.com";
domainArray[2] = "audio2.spotify.com";
domainArray[3] = "a1935.phobos.apple.com";
domainArray[4] = "r13---sn-ab5l6n7r.c.pack.google.com";
domainArray[5] = "a132.phobos.apple.com";
domainArray[6] = "a1736.phobos.apple.com";
domainArray[7] = "r17---sn-vgqs7n7l.c.android.clients.google.com";
domainArray[8] = "s4.amazonaws.com";
domainArray[9] = "s3.amazonaws.com";
for(String string : domainArray){
String domain = suffixList.getRegistrableDomain(string);
System.out.println(domain);
}
我得到了以下输出:
apple.com
siriusxm.com
spotify.com
apple.com
google.com
apple.com
apple.com
google.com
amazonaws.com
null
适用于大多数域,但对于s3.amazonaws.com
,它返回null。但是对于类似的:s4.amazonaws.com
,它会给出正确的结果。问题是什么?
答案 0 :(得分:2)
s3.amazonaws.com 包含在public suffix list中,因此被视为无法注册。在这种情况下,PublicSuffixList.getRegistrableDomain()
会返回null
:
返回: 可注册域名,如果域名不可注册,则为null