public String getIPAddress(){  
    try {  
        URL url = new URL("http://checkip.amazonaws.com/");  
        BufferedReader br = new BufferedReader(new InputStreamReader(url.openStream()));  
        String ip = br.readLine().trim();  
        System.out.println("Public IP Address: " + ip);  
        return ip;  
    } catch (Exception e) {  
        System.out.println("Error in getting public IP address, trying to get local IP address.");  
        try {  
            String localIP = getLocalIP();  
            System.out.println("Local IP Address: " + localIP);  
        } catch (SocketException se) {  
            System.out.println("Error in getting local IP address: " + se.getMessage());  
        }  
    }  
    return null;  
}  
  
private static String getLocalIP() throws SocketException {  
    Enumeration<NetworkInterface> networkInterfaces = NetworkInterface.getNetworkInterfaces();  
    while (networkInterfaces.hasMoreElements()) {  
        NetworkInterface networkInterface = networkInterfaces.nextElement();  
        Enumeration<InetAddress> inetAddresses = networkInterface.getInetAddresses();  
        while (inetAddresses.hasMoreElements()) {  
            InetAddress inetAddress = inetAddresses.nextElement();  
            if (inetAddress instanceof Inet4Address && !inetAddress.isLoopbackAddress()) {  
                return inetAddress.getHostAddress();  
            }  
        }  
    }  
    return null;  
}