Get the user's MAC address based on the IP address

You can use the following code to get the MAC address, depending on your actual needs.

/** *  get MAC address  *  @param  ipAddress 127.0.0.1 *  @return based on IP address  *   @throws  SocketException *  @throws  unknownhostexception */public static  string getlocalmac (string ipaddress)  throws socketexception,unknownhostexception  {// TODO Auto-generated method stubString str =  ""; string macaddress =  "";final string loopback_address =  "127.0.0.1";//  If 127.0.0.1, the local MAC address is obtained. if  (Loopback_address.equals (ipAddress))  {InetAddress inetAddress =  Inetaddress.getlocalhost ();//  It seems that this method requires JDK1.6. Byte[] mac = networkinterface.getbyinetaddress (inetaddress). Gethardwareaddress ();//  The following code is to assemble the MAC address into Stringstringbuilder sb = new stringbuilder ();for  (int i =  0; i < mac.length; i++)  {if  (i != 0)  {sb.append ("-");}  mac[i] & 0xFF  is to convert byte to a positive integer string s = integer.tohexstring (Mac[i] &NBSP;&AMP;&NBSP;0XFF); Sb.append (S.length ()  == 1 ? 0 + s : s);}   Change all lowercase letters of a string to uppercase to become a regular MAC address and return macaddress = sb.tostring (). Trim (). toUpperCase ();return  macAddress;}  else {//  get the MAC address of the non-local IP try {system.out.println (ipAddress); Process p = runtime.getruntime (). EXEC ("nbtstat -a "  + ipaddress); System.out.println ("===process==" +p); Inputstreamreader ir = new inputstreamreader ( P.getinputstream ()); Bufferedreader br = new bufferedreader (IR);while  ((Str = br.readline ())  != null)  {if (Str.indexof ("Mac") >1) {macaddress = str.substring ("Mac") + 9, str.length ()); Macaddress = macaddress.trim (); System.out.println ("macAddress:"  + macaddress); P.destroy (); Br.close (); ir.cLose ();}  catch  (Ioexception ex)  {}return macaddress;}} /** *  return IP address via httpservletrequest  *  *  @param  request *             HttpServletRequest *  @return  ip  String *  @throws  exception */public static string getipaddr ( Httpservletrequest request)  throws exception {string ip = request.getheader ("X-forwarded-for");if  (ip == null | |  ip.length ()  == 0 | |   "Unknown". Equalsignorecase (IP))  {ip = request.getheader ("Proxy-client-ip");} if  (ip == null | |  ip.length ()  == 0 | |   "Unknown". Equalsignorecase (IP))  {ip = request.getheader ("Wl-proxy-client-ip");} if  (ip == null | |  ip.length ()  == 0 | |   "Unknown". Equalsignorecase (IP))  {ip&nbsP;= request.getheader ("Http_client_ip");} if  (ip == null | |  ip.length ()  == 0 | |   "Unknown". Equalsignorecase (IP))  {ip = request.getheader ("Http_x_forwarded_for");} if  (ip == null | |  ip.length ()  == 0 | |   "Unknown". Equalsignorecase (IP))  {ip = request.getremoteaddr ();} Return ip;}

Get the MAC address of the user based on the IP address