java获取本机mac

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.util.Formatter;
import java.util.Locale;


public class Test {
  public static void main(String[] args) throws SocketException, UnknownHostException {
    System.out.println("hp_word");
     String os = System.getProperty("os.name");
        // System.out.println(os);
        if (os != null && os.startsWith("Windows")) {
         getWindowsMac();
        }else{
            getLinuxMac();
        }
    
    
}
  private static void getLinuxMac(){
  String address = "";
  try {
   ProcessBuilder pb = new ProcessBuilder("ifconfig", "-a");
   Process p = pb.start();
   BufferedReader br = new BufferedReader(new InputStreamReader(p.getInputStream()));
   String line;
   while ((line = br.readLine()) != null) {
       if (line.indexOf("HWaddr") != -1) {
          System.out.println(line);
       int index = line.indexOf("HWaddr");
       address = line.substring(index + 7);
       break;
      }
   }
   br.close();
   System.out.println(address.trim());;
  } catch (IOException e) {
  }
  System.out.println(address);;
 }
private static void getWindowsMac() throws UnknownHostException,
        SocketException {
    InetAddress address = InetAddress.getLocalHost();
    NetworkInterface ni = NetworkInterface.getByInetAddress(address);
    //ni.getInetAddresses().nextElement().getAddress();
    byte[] mac = ni.getHardwareAddress();
    String sIP = address.getHostAddress();
    String sMAC = "";
    Formatter formatter = new Formatter();
    for (int i = 0; i < mac.length; i++) {
        sMAC = formatter.format(Locale.getDefault(), "%02X%s", mac[i],
                (i < mac.length - 1) ? "-" : "").toString();
    }
    System.out.println("IP" + sIP);
    System.out.println("MAC" + sMAC);
}
 
 
}