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? docs.oracle.com/javase/tutorial/essential/regex — asela38
– asela38, Commented Nov 25, 2013 at 11:59
This maybe can help you: stackoverflow.com/questions/3234090/… — melli-182
– melli-182, Commented Nov 25, 2013 at 12:01

liquidsnake786 · Accepted Answer · 2013-11-25 12:01:43Z

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, 2013 at 12:01

liquidsnake786

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3 Comments

emphywork Over a year ago

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.

liquidsnake786 Over a year ago

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.

Marc Rasmussen Over a year ago

@liquidsnake786 with sites like 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? )

Kai Sternad · Accepted Answer · 2013-11-25 12:12:03Z

1

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

answered Nov 25, 2013 at 12:12

Kai Sternad

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Comments

Bohemian · Accepted Answer · 2013-11-25 12:24:49Z

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, 2013 at 12:24

answered Nov 25, 2013 at 12:05

Bohemian♦

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1 Comment

Bohemian Over a year ago

@RandomGuy $1 means "captured group 1", which is the bracketed pattern to capture the dot and word chars of the extension

Mehdi · Accepted Answer · 2016-07-03 19:51:38Z

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 3, 2016 at 19:51

Mehdi

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