class NetUtils {

  public static String toURL(String protocol, String host, int port, String path) {
    StringBuilder sb = new StringBuilder();
    sb.append(protocol).append("://");
    sb.append(host).append(':').append(port);
    if (path.charAt(0) != '/')
      sb.append('/');
    sb.append(path);
    return sb.toString();
  }

}