@BeforeClass
  public static void beforeClass() {

    Enumeration<NetworkInterface> netInterfaces = null;
    try {
      netInterfaces = NetworkInterface.getNetworkInterfaces();
      while (netInterfaces.hasMoreElements()) {
        NetworkInterface ni = (NetworkInterface) netInterfaces.nextElement();
        byte[] mac = ni.getHardwareAddress();
        StringBuilder sb = new StringBuilder();
        if (!DataTools.isEmpty(mac)) {
          for (byte b : mac) {
            sb.append(toHexByte(b));
            sb.append("-");
          }

          if (sb.length() > 1) sb.deleteCharAt(sb.length() - 1);

          if (sb.length() > 1) list.add(sb.toString());
        }
      }
    } catch (Exception e) {
      //			list = null;
    } finally {
      netInterfaces = null;
    }

    // getMacAddress();

  }
  /**
   * <br>
   * Created on: 2013-8-21 上午10:59:29
   */
  private static void getMacAddress() {
    BufferedReader br = null;
    Process process = null;
    Pattern macPattern = null;
    Matcher macMatcher = null;

    try {

      if (Env.getPlatform() == Env.getOsWindows())
        process = Runtime.getRuntime().exec("cmd /c ipconfig /all");
      else if (Env.getPlatform() == Env.getOsUnix())
        process = Runtime.getRuntime().exec("ifconfig");

      br = new BufferedReader(new InputStreamReader(process.getInputStream()));

      String line = null;

      macPattern = Pattern.compile("([0-9A-Fa-f]{2})(-[0-9A-Fa-f]{2}){5}");
      boolean result = false;

      while ((line = br.readLine()) != null) {
        if (DataTools.isEmpty(line)) continue;
        macMatcher = macPattern.matcher(line);
        result = macMatcher.find();
        if (result) list.add(macMatcher.group(0));
      }
      br.close();
      br = null;
      macMatcher = null;
      macPattern = null;
    } catch (IOException e) {
    } finally {
      try {
        if (!DataTools.isEmpty(br)) {
          br.close();
          br = null;
        }
        macMatcher = null;
        macPattern = null;
      } catch (IOException e) {
      } finally {
        br = null;
        macMatcher = null;
        macPattern = null;
      }
    }
  }