JAVA获取访问者的内网IP地址

 

 

  /**
     * 获取访问者内网IP
     * @return the server ip
     */
    public static String getIntranetIp() {
        // 本地IP，如果没有配置外网IP则返回它
        String localip = null;
        // 外网IP
        String netip = null;
        try {
            Enumeration netInterfaces = NetworkInterface.getNetworkInterfaces();
            InetAddress ip = null;
            // 是否找到外网IP
            boolean finded = false;
            while (netInterfaces.hasMoreElements() && !finded) {
                NetworkInterface ni = (NetworkInterface) netInterfaces.nextElement();
                Enumeration address = ni.getInetAddresses();
                while (address.hasMoreElements()) {
                    ip = (InetAddress) address.nextElement();
                    if (!ip.isSiteLocalAddress() && !ip.isLoopbackAddress() && ip.getHostAddress().indexOf(":") == -1) {
                        // 外网IP
                        netip = ip.getHostAddress();
                        finded = true;
                        break;
                    } else if (ip.isSiteLocalAddress() && !ip.isLoopbackAddress() && ip.getHostAddress().indexOf(":") == -1) {
                        // 内网IP
                        localip = ip.getHostAddress();
                    }
                }
            }
        } catch (SocketException e) {
            e.printStackTrace();
        }

        if (netip != null && !"".equals(netip)) {
            return netip;
        } else {
            return localip;
        }
    }