// 获取mac地址
  public static String getMacAddress() {
    try {
      Enumeration<NetworkInterface> allNetInterfaces = NetworkInterface.getNetworkInterfaces();
      byte[] mac = null;
      while (allNetInterfaces.hasMoreElements()) {
        NetworkInterface netInterface = (NetworkInterface) allNetInterfaces.nextElement();
        if (netInterface.isLoopback() || netInterface.isVirtual() || !netInterface.isUp()) {
          continue;
        } else {
          mac = netInterface.getHardwareAddress();
          if (mac != null) {
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < mac.length; i++) {
              sb.append(String.format("X%s", mac[i], (i < mac.length - 1) ? "-" : ""));
            }
            if (sb.length() > 0) {
              return sb.toString();
            }
          }
        }
      }
    } catch (Exception e) {
      _logger.error("MAC地址获取失败", e);
    }
    return "";
  }

  // 获取ip地址
  public static String getIpAddress() {
    try {
      Enumeration<NetworkInterface> allNetInterfaces = NetworkInterface.getNetworkInterfaces();
      InetAddress ip = null;
      while (allNetInterfaces.hasMoreElements()) {
        NetworkInterface netInterface = (NetworkInterface) allNetInterfaces.nextElement();
        if (netInterface.isLoopback() || netInterface.isVirtual() || !netInterface.isUp()) {
          continue;
        } else {
          Enumeration<InetAddress> addresses = netInterface.getInetAddresses();
          while (addresses.hasMoreElements()) {
            ip = addresses.nextElement();
            if (ip != null && ip instanceof Inet4Address) {
              return ip.getHostAddress();
            }
          }
        }
      }
    } catch (Exception e) {
      _logger.error("IP地址获取失败", e);
    }
    return "";
  }

 public final static String WIN_OS = "WINDOWS";
  public final static String MAC_OS = "MAC";
  public final static String LINUX_OS = "LINUX";
  public final static String OTHER_OS = "OTHER";

  public static String getOS() {
    if (SystemUtils.IS_OS_WINDOWS){
      return WIN_OS;
    }
    if (SystemUtils.IS_OS_MAC || SystemUtils.IS_OS_MAC_OSX){
      return MAC_OS;
    }
    if (SystemUtils.IS_OS_UNIX){
      return LINUX_OS;
    }
    return OTHER_OS;
  }

/**
   * 设置http代理
   */
  public static void setHttpProxy() {
    Properties prop = System.getProperties();
    // 设置http访问要使用的代理服务器的地址
    prop.setProperty("http.proxyHost", HTTP_PROXY_HOST);
    // 设置http访问要使用的代理服务器的端口
    prop.setProperty("http.proxyPort", HTTP_PROXY_PORT);
    // 设置不需要通过代理服务器访问的主机，可以使用*通配符，多个地址用|分隔
    prop.setProperty("http.nonProxyHosts", RemoteConfig.PROXT_FILTER_DOMAIN);
  }
  
  /**
   * 移除http代理
   */
  public static void removeHttpProxy() {
    Properties prop = System.getProperties();
    prop.remove("http.proxyHost");
    prop.remove("http.proxyPort");
    prop.remove("http.nonProxyHosts");
  }