Java gets the current computer card MAC address

Package com.yjm.testmac;import java.net.inetaddress;import java.net.networkinterface;import  java.net.SocketException;import java.net.UnknownHostException;import java.util.Enumeration; Public class mactest {public static void main (String[] args)  {//  Get the MAC address information of the machine test ();//  the network card information Test1 () based on the current IP address information object. Private static void test1 ()  {system.out.println ("Run start in ==========test1 method ..."); try  {inetaddress ipinfo = inetaddress.getlocalhost ();//  output IP address content System.out.println ( Ipinfo.gethostaddress ());//  obtains the NIC content byte array byte[] byaddress = networkinterface.getbyinetaddress (Ipinfo). gethardwareaddress ();//  output array length System.out.println (byaddress.length);//  address string container StringBuffer  stringbuffer = new stringbuffer ();//  a single array value to convert for  (int i = 0;  i < byaddress.length; i++)  {//  Single array value   is a groundAddress number Add delimiter if  (i != 0)  {stringbuffer.append ("-");}   bytes converted to 16 decimal int number = byaddress[i] & 0xff; string straddr = integer.tohexstring (number); System.out.println ("Converted: ======================================="  + straddr);//  when the value of the conversion is   single digit , in front of the complement 0if  (Straddr.length ()  == 1)  {stringbuffer.append ("0"  + straddr);}  else {stringbuffer.append (STRADDR);}}   Output converted MAC address System.out.println ("converted MACAddress:" + stringbuffer.tostring (). toUpperCase ());}  catch  (unknownhostexception e)  {e.printstacktrace ();}  catch  (socketexception e)  {e.printstacktrace ();} System.out.println ("Run over in ==========test1 method ..."); Private static void test ()  {system.out.println ("Run start in ==========test method ...");//  Initialize   NIC information container enumeration<networkinterface> allnetdevices = null;//  Initializes a Nic object networkinterface networkinterface = null;//  wait until the network card byte array information byte[] networkbyte = null;//    Package NIC information string stringbuffer stringbuffer=null;try {//  get NIC information container allnetdevices =  Networkinterface.getnetworkinterfaces ();while  (Allnetdevices.hasmoreelements ())  {//  get a single-card Nic object   Iterative output NIC information networkinterface = allnetdevices.nextelement ();//  get   network card information that is being   running if  (Networkinterface.isup ())  {//the network adapter address container Stringbuffer = new stringbuffer () used after converting bytes;// Nic MAC address byte container networkbyte = networkinterface.gethardwareaddress ();//NIC name System.out.println ("NIC   Name:   "+networkinterface.getname ());                     //Nic Information System.out.println ("NIC info  : " + Networkinterface.getdisplayname ());//  a single array value for conversion for  (int i = 0; i <  networkbyte.length; i++)  {//  Single array value   is an address bit number add delimiter if  (i != 0)  {stringbuffer.append ("-");}   bytes converted to 16 decimal int number = networkbyte[i] & 0xff; string straddr = integer.tohexstring (number); System.out.println ("Converted: =================================="  + straddr);//  when the value of the conversion is   single digit, In front of the complement 0if  (Straddr.length ()  == 1)  {stringbuffer.append ("0"  + straddr);}  else {stringbuffer.append (STRADDR);}}   Output converted MAC address System.out.println ("Converted MACAddress is:" + stringbuffer.tostring (). toUpperCase ());}}}  catch  (socketexception e)  {e.printstacktrace ();} System.out.println ("Run  over in ==========test method ...");}

Method can only get 127.0.0.1 under Linux, the correct IP address can only be obtained under Windows.

Output Result:

Run start in ==========test method ...

Network card name: Lo

Nic information: Software Loopback Interface 1

The converted MACAddress are:

Nic Name: Eth3

Nic Information: Realtek PCIe GBE Family Controller

After conversion: ==================================14

After conversion: ==================================da

After conversion: ==================================E9

After conversion: ==================================2B

After conversion: ==================================38

After conversion: ==================================10

The converted MACAddress is: 14-da-e9-2b-38-10

Nic Name: Net4

Nic Information: Teredo Tunneling Pseudo-Interface

After conversion: ==================================0

After conversion: ==================================0

After conversion: ==================================0

After conversion: ==================================0

After conversion: ==================================0

After conversion: ==================================0

After conversion: ==================================0

After conversion: ==================================E0

The converted MACAddress is: 00-00-00-00-00-00-00-E0

Run over in the ==========test method ...

Run start in ==========test1 method ...

192.168.101.243

6

After conversion: =======================================14

After conversion: =======================================da

After conversion: =======================================E9

After conversion: =======================================2B

After conversion: =======================================38

After conversion: =======================================10

The converted MACAddress is: 14-da-e9-2b-38-10

Run over in the ==========test1 method ...

Java gets the current computer card MAC address