private static String[] splitString ( String str, int maxLen ) {
        int num = str.length() / maxLen;
        if ( str.length() % maxLen != 0 ) {
            num++;
        }
        String strings[] = new String[num];
        for ( int i = 0; i < num; i++ ) {
            strings[ i ] = str.substring(i * maxLen, Math.min(str.length() - 1, ( i + 1 ) * maxLen));
        }
        return strings;
    }