public class NetworkInterfaceUtil {    private static List
    
      getInterfaces() throws SocketException {        return Collections.list(NetworkInterface.getNetworkInterfaces());    }    private static List
     
       getNonLoopBackInterfaces() throws SocketException {        return getInterfaces().stream()                              .filter(i -> Unchecked.supplier(() -> !i.isLoopback()).get())                              .collect(toList());    }    public static List
      
        getIp4Addresses() throws SocketException {        final List
       
         is = getNonLoopBackInterfaces();        return is.stream().flatMap(i -> {            final Enumeration
        
          addresses = i.getInetAddresses();            final Builder
         
           builder = Stream.builder(); while (addresses.hasMoreElements()) { final InetAddress ip = addresses.nextElement(); if (!ip.isLoopbackAddress()) { if (ip.getHostAddress().equalsIgnoreCase("127.0.0.1")) { continue; } if (ip instanceof Inet6Address) { continue; } if (ip instanceof Inet4Address) { builder.add(ip.getHostAddress()); } } } return builder.build(); }).collect(toList()); }}
         
        
       
      
     
    

write on 2017-1-4