String url getting extension

Question

I am trying to get the extension (dk, com, org, eu) or any other domain extension from a String.

for example:

http://www.example.com/siteone/sitetwo/currentpage

From this String i would like to get the .com

I could go the very messy way around and do subString however the problem comes when an url looks like this:

dk.webpage.otherstuff.com/page

So how will i go around this in a way that doesnt require me to check everything every step of the way

Have you try using regular expressions? http://docs.oracle.com/javase/tutorial/essential/regex/ — asela38, Nov 25 '13 at 11:59
This maybe can help you: http://stackoverflow.com/questions/3234090/how-to-determine-the-file-extension-of-a-file-from-a-uri — melli-182, Nov 25 '13 at 12:01

score 1 · Accepted Answer · answered Nov 25 '13 at 12:01

1

Use the getHost() method like this:

public static String getDomainName(String testUrl) throws URISyntaxException {
    URI fullUri = new URI(testUrl);
    String domainName = fullUri.getHost();
    return domainName.startsWith("www.") ? domainName.substring(4) : domainName;
}

After you have done that then just use subString for the .com part of your domain name.

answered Nov 25 '13 at 12:01

liquidsnake786

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if you are directly use "www." and subString(4) won't work because now a days there are some URL which starts like www3.xyz.com than your code will fail. – emphywork Nov 25 '13 at 12:05
The OP can use a regex on the domainName then, depends on how detailed you want to go, with the introduction of custom domains this whole practical would be near impossible to do anyway. – liquidsnake786 Nov 25 '13 at 12:08
@liquidsnake786 with sites like http://www.homesick.nu\ i get an error do you know why? (the error is invalid character at index 7 (meaning that \ is wrong but how come? ) – Marc Rasmussen Nov 25 '13 at 12:20

Bohemian · Answer 2 · 2013-11-25T12:24:49.643

1

Try this:

String ext = url.replaceAll(".*//[^/]*(\\.\\w+)/.*", "$1");

Some test code:

String url = "http://www.example.com/siteone/sitetwo/currentpage";
String ext = url.replaceAll(".*//[^/]*(\\.\\w+)/.*", "$1");
System.out.println(ext);

Output:

.com

edited Nov 25 '13 at 12:24

answered Nov 25 '13 at 12:05

Bohemian

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@RandomGuy $1 means "captured group 1", which is the bracketed pattern to capture the dot and word chars of the extension – Bohemian Nov 25 '13 at 12:28

score 1 · Answer 3 · answered Nov 25 '13 at 12:12

1

Use Guava's InternetDomainName class. Specifically have a look at the publicSuffix method.

answered Nov 25 '13 at 12:12

Kai Sternad

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score 0 · Answer 4 · answered Jul 03 '16 at 19:51

0

Try this :

private String getExtensionFromDomain(String domainName){ int p = domainName.lastIndexOf(".") +1; return domainName.substring(p); }

In case of example.co.ma this will output : .ma

answered Jul 03 '16 at 19:51

Mehdi

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String url getting extension

4 Answers4