public static String urlEncode(String strIn) {
        // Null begets null.
        if (strIn == null) {
            return null;
        }

        try {
            return URLEncoder.encode(strIn, "UTF-8");
        } catch (UnsupportedEncodingException e) {
            // This should never happen since UTF-8 always exists.
            throw new IllegalArgumentException("UTF-8");
        }
    }
public static String urlEncode ( String strIn ) { if ( strIn == null ) { return null ; } try { return URLEncoder . encode ( strIn , "UTF-8" ) ; } catch ( UnsupportedEncodingException e ) { throw new IllegalArgumentException ( "UTF-8" ) ; } }
Encode the given string by replacing characters not legal in URLs with the
appropriate escape sequences. For example "A B" becomes "A%20B". If a null string
is passed, the result is null. This method calls URLEncoder.decode("UTF-8", strIn),
which converts non-ASCII characters to UTF-8 sequences and then escapes the UTF-8
sequences. It also converts spaces into '+' signs.

@param  strIn    Input string to encode.
@return          URL-encoded version of the same string, or null if strIn is null.
@see             #urlDecode(String)