java获取计算机MAC地址

/**  
 * 获取计算机MAC地址  
 * @return mac  
 */
 public static String getLocalMac(){
	// 这里可以放一个随机数或者唯一id做一个兜底
    String mac = "";  
    try {  
        // 获取本机主机名  
        String hostName = InetAddress.getLocalHost().getHostName();  
        // 获取本机所有的IP地址  
        InetAddress[] inetAddresses = InetAddress.getAllByName(hostName);  
        // 遍历IP地址  
        for (InetAddress inetAddress : inetAddresses) {  
            NetworkInterface net = NetworkInterface.getByInetAddress(inetAddress);  
            byte[] macBytes = net.getHardwareAddress();  
            if (macBytes != null){  
                return transBytesToStr(macBytes);  
            }  
        }    
    } catch (UnknownHostException | SocketException e) {  
        e.printStackTrace();  
    }  
    return mac;  
}