How to convert a ip string xxx.xxx.xxx.xxx:xxxxx to xxx.xxx.xxx.xxx?

Question

I'm getting this ips from my server like:

"/177.127.101.68:53964"
"/201.80.15.100:54263"
"/177.67.38.54:51309"

and i need it to be like just "177.127.101.68", i was going to delete the last 5 string characters but sometimes it comes "/186.213.186.40:4625" so i dont know exactly how to do it... is there any way to do that?

Search for a colon and use substring? Note that this will fail for IPv6 addresses... — Jon Skeet, Jan 21 '15 at 15:29
[String#split(":");](http://stackoverflow.com/questions/3481828/how-to-split-a-string-in-java) — Narmer, Jan 21 '15 at 15:30

score 5 · Accepted Answer · answered Jan 21 '15 at 15:30

5

Use the split() and substring() methods of the String class, for one approach:

String ip = "/177.127.101.68:53964";
String whatYouWant = ip.split(":")[0].substring(1);

Please see the Javadocs for split and substring. You'll find yourself using them a lot, in my opinion.

answered Jan 21 '15 at 15:30

Kon

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If there is no ":" i ll get an error or nothing ll happen? – Thiago Sabin Jan 21 '15 at 15:36
If there is no ":", the resulting array will be of size 1 (will have exactly 1 element, containing the whole line). So it will still function. – Amr Jan 21 '15 at 15:40
@ThiagoSabin test it (it should work fine). Also all your examples contain `:` so if there is possibility that there will be no `:` you should mention about this in your question. Stack Overflow is not some contest site where answerers should focus of all possible corner cases, so it is in best interest of asker to put as many important informations as possible. – Pshemo Jan 21 '15 at 15:40

score 2 · Answer 2 · answered Jan 21 '15 at 15:33

2

You only need substring:

String ip = "/177.127.101.68:53964";
String result = ip.substring(1, ip.indexOf(':')-1);

answered Jan 21 '15 at 15:33

Jens

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score 2 · Answer 3 · answered Jan 21 '15 at 15:52

2

Other way around could be something like

String myIP = "/177.127.101.68:53964";
URL url = new URL("http:/" + myIP);// will create URL for http://177.127.101.68:53964
String host = url.getHost(); // will return only 177.127.101.68 part

answered Jan 21 '15 at 15:52

Pshemo

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How to convert a ip string xxx.xxx.xxx.xxx:xxxxx to xxx.xxx.xxx.xxx?

3 Answers3