Some network utils

NetworkUtils.java

class NetworkUtils {
    public static String getLocalIp() {
        try {
            Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
            while (interfaces.hasMoreElements()) {
                NetworkInterface networkInterface = interfaces.nextElement();
                if (networkInterface.isLoopback() || !networkInterface.isUp() || networkInterface.isVirtual() || networkInterface.isPointToPoint()) {
                    continue;
                }
                Enumeration<InetAddress> addresses = networkInterface.getInetAddresses();
                while (addresses.hasMoreElements()) {
                    InetAddress address = addresses.nextElement();
                    final String ip = address.getHostAddress();
                    if (Inet4Address.class == address.getClass()) {
                        return ip;
                    }
                }
            }
        } catch (SocketException e) {
            throw new RuntimeException(e);
        }
        return null;
    }
}