How to obtain the last path segment of an uri

Question

I have in input a string that is an uri how is possible to get the last path segment? that in my case is an id?

this is my input url

String uri = "http://base_path/some_segment/id"

and i have to obtain the id i' have tried with this

String strId = "http://base_path/some_segment/id";
            strId=strId.replace(path);
    strId=strId.replaceAll("/", "");
    Integer id =  new Integer(strId);
    return id.intValue();

but it doasn't work and for sure there is a better way to do it

thx a lot

Answer 1

is that what you are looking for:

URI uri = new URI("http://example.com/foo/bar/42?param=true");
String path = uri.getPath();
String idStr = path.substring(path.lastIndexOf('/') + 1);
int id = Integer.parseInt(idStr);

alternatively

URI uri = new URI("http://example.com/foo/bar/42?param=true");
String[] segments = uri.getPath().split("/");
String idStr = segments[segments.length-1];
int id = Integer.parseInt(idStr);

Answer 2

Get URL from URI and use getFile() if you are not ready to use substring way of extracting file.

hanks, Rao

Answer 3

Nice of you to accept the answer, but the version you accepted was actually incorrect. Update: it's no longer accepted. Heres a simpler correct version:

Here's a short method to do it:

public static String getLastBitFromUrl(final String url){
    // return url.replaceFirst("[^?]*/(.*?)(?:\\?.*)","$1);" <-- incorrect
    return url.replaceFirst(".*/([^/?]+).*", "$1");
}

Test Code:

public static void main(final String[] args){
    System.out.println(getLastBitFromUrl(
        "http://example.com/foo/bar/42?param=true"));
    System.out.println(getLastBitFromUrl("http://example.com/foo"));
    System.out.println(getLastBitFromUrl("http://example.com/bar/"));
}

Output:

42
foo
bar

Explanation:

.*/      // find anything up to the last / character
([^/?]+) // find (and capture) all following characters up to the next / or ?
         // the + makes sure that at least 1 character is matched
.*       // find all following characters


$1       // this variable references the saved second group from above
         // I.e. the entire string is replaces with just the portion
         // captured by the parentheses above