How can I write to check a URL?

Question

A friend of mine requested to write a simple code to check whether a URL ends with asp or not. I am thinking about accepting the URL as string and checking the last tree letters if it's as or not. I just want to check is there any ways to write this code. (of course there are plenty of ways but it need to be simple)

Thanks in advance

Are you concerned with querystring variables? eg: ../index.asp?article=1455&category=32 — Ken Gregory
– Ken Gregory, Commented May 4, 2011 at 17:49

Peter Knego · Accepted Answer · 2011-05-04 17:48:15Z

4

String url = ... if(url.endsWith(".asp")){ // do your thing }

answered May 4, 2011 at 17:48

Peter Knego

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Comments

Adam Batkin · Accepted Answer · 2011-05-04 17:56:56Z

You will probably want to use the String.endsWith() method.

if (s.endsWith("asp")) { System.out.println("Yes"); } else { System.out.println("No"); }

If you really want to do this properly, you can parse the string as a real java.net.URL and extract the path using getPath().

URL url = new URL(s); String path = url.getPath(); if (path.endsWith("asp")) { System.out.println("Yes"); } else { System.out.println("No"); }

Im going to write the output yes or no into a text file. However I cannot think how to build it yet. Also what if the string ends with index.asp?article=123. As Ken mentioned.
@the magnificent: Answer updated to handle things like index.asp?article=123. As for writing to a file, use a FileWriter or just redirect the output of your program.

Ken Gregory · Accepted Answer · 2011-05-04 18:01:42Z

Use a regular expression:

.*\.asp(x){0,1}(\?){0,1}.*

This will handle these cases:

Martijn · Accepted Answer · 2011-05-04 18:07:43Z

A regex would be a solution though I find them extremely ugly in Java.

String url = .... if (Pattern.compile("\.asp[^\.]*\z").matcher(url).matches()){ //do your thing }

Yuk indeed. And i'm not sure if I got the regex right

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