private static String getHostIp(){
        try{
            Enumeration<NetworkInterface> allNetInterfaces = NetworkInterface.getNetworkInterfaces();
            while (allNetInterfaces.hasMoreElements()){
                NetworkInterface netInterface = (NetworkInterface) allNetInterfaces.nextElement();
                Enumeration<InetAddress> addresses = netInterface.getInetAddresses();
                while (addresses.hasMoreElements()){
                    InetAddress ip = (InetAddress) addresses.nextElement();
                    if (ip != null 
                            && ip instanceof Inet4Address
                            && !ip.isLoopbackAddress() //loopback地址即本机地址，IPv4的loopback范围是127.0.0.0 ~ 127.255.255.255
                            && ip.getHostAddress().indexOf(":")==-1){
                        System.out.println("本机的IP = " + ip.getHostAddress());
                        return ip.getHostAddress();
                    } 
                }
            }
        }catch(Exception e){
            e.printStackTrace();
        }
        return null;
    }

转载自：https://blog.csdn.net/u010295735/article/details/74645653