url and name spaces java convertion.

Question

I need to be able to convert:

(url) http://www.joe90.com/showroom

to

(namespace) com.joe90.showroom

I can do this using tokens etc, and a enforced rule set.

However, is there a way (a java package) that will do this for me? or do i need to write one myself?

Thanks

Answer 1

java.net.URL url = new java.net.URL("http://www.joe90.com/showroom");
String tokens[] = url.getHostname().split(".");
StringBuilder sb = new StringBuilder();
for (int i=0; i<tokens.length; i++) {
  if (i > 1) {
    sb.append('.');
  }
  sb.append(tokens[i]);
}
String namespace = sb.toString();

Alternatively you can parse the hostname out.

Pattern p = Pattern.compile("^(\\w+://)?(.*?)/");
Matcher m = p.matcher(url); // string
if (m.matches()) {
  String tokens[] = m.group(2).split(".");
  // etc
}

Of course that regex doesn't match all URLs, for example:

http://[email protected]/...

That's why I suggested using java.net.URL: it does all the URL validation and parsing for you.

Answer 2

Your best bet would be to split the string based on the . and / characters (e.g. using Sting.split(), and then concatenate the pieces in reverse order, skipping over any you don't want to include (e.g. www)