如何取 MAC地址，求高手，急

import java.net.InetAddress;
import java.io.InputStream;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.text.ParseException;
import java.util.StringTokenizer;public class NetworkInfo {
   private static String getMacAddress() throws IOException {
       String os = System.getProperty("os.name");
       try {
           if (os.startsWith("Windows")) {
               return windowsParseMacAddress(windowsRunIpConfigCommand());
           } else {
               throw new IOException("unknown operating system: " + os);
           }
       } catch (ParseException ex) {
           ex.printStackTrace();
           throw new IOException(ex.getMessage());
       }
   }   
    public static void main(String[] args) 
{
try
{ System.out.println("UUID = " + NetworkInfo.getMacAddress());
}
catch( Exception e )
{
}
}
   private final static String windowsParseMacAddress(String ipConfigResponse) throws ParseException {
       String localHost = null;
       try {
           localHost = InetAddress.getLocalHost().getHostAddress();
       } catch (java.net.UnknownHostException ex) {
           ex.printStackTrace();
           throw new ParseException(ex.getMessage(), 0);
       }
       StringTokenizer tokenizer = new StringTokenizer(ipConfigResponse, "\n");
       String lastMacAddress = null;
       while (tokenizer.hasMoreTokens()) {
           String line = tokenizer.nextToken().trim();
           // see if line contains IP address
           if (line.endsWith(localHost) && lastMacAddress != null) {
   System.out.println( "macAddress = " + lastMacAddress );
               return lastMacAddress;
           }
           // see if line contains MAC address
           int macAddressPosition = line.indexOf(":");
           if (macAddressPosition <= 0)
               continue;
           String macAddressCandidate = line.substring(macAddressPosition + 1).trim();
           if (windowsIsMacAddress(macAddressCandidate)) {
               lastMacAddress = macAddressCandidate;
               continue;
           }
       }
       ParseException ex = new ParseException("cannot read MAC address from [" + ipConfigResponse + "]", 0);
       ex.printStackTrace();
       throw ex;
   }
   private final static boolean windowsIsMacAddress(String macAddressCandidate) {
       // TODO: use a smart regular expression
       if (macAddressCandidate.length() != 17)
           return false;
       return true;
   }
   private final static String windowsRunIpConfigCommand() throws IOException {
       Process p = Runtime.getRuntime().exec("ipconfig /all");
       InputStream stdoutStream = new BufferedInputStream(p.getInputStream());
       StringBuffer buffer= new StringBuffer();
       for (;;) {
           int c = stdoutStream.read();
           if (c == -1)
               break;
           buffer.append((char)c);
       }
       String outputText = buffer.toString();
       stdoutStream.close();
   System.out.println("outputText = " + outputText );
       return outputText;
   }
}