查ip

   private static String localIp(){
        String ip = null;
        Enumeration allNetInterfaces;
        try {
            allNetInterfaces = NetworkInterface.getNetworkInterfaces();           
            while (allNetInterfaces.hasMoreElements()) {
                NetworkInterface netInterface = (NetworkInterface) allNetInterfaces.nextElement();
                List<InterfaceAddress> InterfaceAddress = netInterface.getInterfaceAddresses();
                for (InterfaceAddress add : InterfaceAddress) {
                    InetAddress Ip = add.getAddress();
                    if (Ip != null && Ip instanceof Inet4Address) {
                        ip = Ip.getHostAddress();
                    }
                }
            }
        } catch (SocketException e) {
            // TODO Auto-generated catch block       
           System.out.println("获取本机Ip失败:异常信息:"+e.getMessage());
        }
        return ip;
    }