NetworkUtil.java

public static List<String> getIpAddressString() {
        List<String> result = new ArrayList<>();
        try {
            for (Enumeration<NetworkInterface> enNetI = NetworkInterface
                    .getNetworkInterfaces(); enNetI.hasMoreElements(); ) {
                NetworkInterface netI = enNetI.nextElement();
                if (netI.getDisplayName().matches("wlan(.*)") || netI.getDisplayName().matches("eth(.*)")) {
                    for (Enumeration<InetAddress> enumIpAddr = netI
                            .getInetAddresses(); enumIpAddr.hasMoreElements(); ) {
                        InetAddress inetAddress = enumIpAddr.nextElement();
                        if (inetAddress instanceof Inet4Address && !inetAddress.isLoopbackAddress()) {
                            result.add(inetAddress.getHostAddress());
                        }
                    }
                }
            }
        } catch (SocketException e) {
            e.printStackTrace();
        }
        return result;
    }