JDK6新特性,JAVA获得机器MAC地址的方法

import java.io.BufferedReader;   
import java.io.InputStreamReader;   
import java.net.NetworkInterface;   
import java.util.Enumeration;   
 
/**  
* JDK6新特性,JAVA获得机器MAC地址的方法  
*  
* @author 老紫竹(Java世纪网,java2000.net)  
*/   
public class Test {   
  // 返回一个字节的十六进制字符串   
  static String hexByte(byte b) {   
    String s = "000000" + Integer.toHexString(b);   
    return s.substring(s.length() - 2);   
  }   
 
  public static void main(String[] args) throws Exception {   
    System.out.println("本机器的所有的网卡MAC发下:");   
    getMacOnWindow();   
    getMac();   
  }   
 
  /**  
   * JDK1.6新特性获取网卡MAC地址  
   */   
  public static void getMac() {   
    try {   
      Enumeration<NetworkInterface> el = NetworkInterface.getNetworkInterfaces();   
      while (el.hasMoreElements()) {   
        byte[] mac = el.nextElement().getHardwareAddress();   
        if (mac == null)   
          continue;   
 
        StringBuilder builder = new StringBuilder();   
        for (byte b : mac) {   
          builder.append(hexByte(b));   
          builder.append("-");   
        }   
        builder.deleteCharAt(builder.length() - 1);   
        System.out.println(builder);   
 
      }   
    } catch (Exception exception) {   
      exception.printStackTrace();   
    }   
  }   
 
  /**  
   * 原始的获取网卡MAC地址  
   */   
  public static void getMacOnWindow() {   
    try {   
      String mac = null;   
      Process process = Runtime.getRuntime().exec("ipconfig /all");   
      BufferedReader buffer = new BufferedReader(new InputStreamReader(process.getInputStream()));   
      for (String line = buffer.readLine(); line != null; line = buffer.readLine()) {   
        int index = line.indexOf("Physical Address");   
        if (index <= 0) {   
          continue;   
        }   
        mac = line.substring(index + 36);   
        break;   
      }   
      buffer.close();   
      process.waitFor();   
      System.out.println(mac);   
    } catch (Exception exception) {   
      exception.printStackTrace();   
    }   
  }   
}