获取本机IP

packagecom.dangdang.ddframe.job.internal.env;

importjava.net.InetAddress;

importjava.net.NetworkInterface;

importjava.net.SocketException;

importjava.net.UnknownHostException;

importjava.util.Enumeration;

importcom.dangdang.ddframe.job.exception.JobException;

/**

 * 获取真实本机网络的服务.

 *

 *@authorzhangliang

 */

publicclassLocalHostService {

   

   privatestaticvolatileStringcachedIpAddress;

   

   /**

     * 获取本机IP地址.

     *

     *<p>

     * 有限获取外网IP地址.

     * 也有可能是链接着路由器的最终IP地址.

     *</p>

     *

     *@return本机IP地址

     */

   publicString getIp() {

       if(null!=cachedIpAddress) {

           returncachedIpAddress;

        }

        Enumeration<NetworkInterface> netInterfaces;

       try{

            netInterfaces = NetworkInterface.getNetworkInterfaces();

        }catch(finalSocketException ex) {

           thrownewJobException(ex);

        }

        String localIpAddress =null;

       while(netInterfaces.hasMoreElements()) {

            NetworkInterface netInterface = netInterfaces.nextElement();

            Enumeration<InetAddress> ipAddresses = netInterface.getInetAddresses();

           while(ipAddresses.hasMoreElements()) {

                InetAddress ipAddress = ipAddresses.nextElement();

               if(isPublicIpAddress(ipAddress)) {

                    String publicIpAddress = ipAddress.getHostAddress();

                   cachedIpAddress= publicIpAddress;

                   returnpublicIpAddress;

                }

               if(isLocalIpAddress(ipAddress)) {

                    localIpAddress = ipAddress.getHostAddress();

                }

            }

        }

       cachedIpAddress= localIpAddress;

       returnlocalIpAddress;

    }

   

   privatebooleanisPublicIpAddress(finalInetAddress ipAddress) {

       return!ipAddress.isSiteLocalAddress() && !ipAddress.isLoopbackAddress() && !isV6IpAddress(ipAddress);

    }

   

   privatebooleanisLocalIpAddress(finalInetAddress ipAddress) {

       returnipAddress.isSiteLocalAddress() && !ipAddress.isLoopbackAddress() && !isV6IpAddress(ipAddress);

    }

   

   privatebooleanisV6IpAddress(finalInetAddress ipAddress) {

       returnipAddress.getHostAddress().contains(":");

    }

   

   /**

     * 获取本机Host名称.

     *

     *@return本机Host名称

     */

   publicString getHostName() {

       returngetLocalHost().getHostName();

    }

   

   privatestaticInetAddress getLocalHost() {

        InetAddress result;

       try{

            result = InetAddress.getLocalHost();

        }catch(finalUnknownHostException ex) {

           thrownewJobException(ex);

        }

       returnresult;

    }

}