java取mac地址

网上搜到一段取mac的代码，刚好用到，存下，改进使用正则表达式来匹配mac

public String getMACAddress(String ip) {
        String str = "";
        String macAddress = "";
        try {
            Process p = Runtime.getRuntime().exec("nbtstat -A " + ip);
            InputStream inpput = p.getInputStream();
            String content = IOUtils.toString(inpput);

            Pattern pattern = Pattern.compile("\\w{2}-\\w{2}-\\w{2}-\\w{2}-\\w{2}-\\w{2}");
            Matcher matcher = pattern.matcher(content);

            if (matcher.find()) {
                macAddress = matcher.group();
            }
        } catch (IOException e) {
            e.printStackTrace(System.out);
        }
        return macAddress;
    }