Java获取调用命令行之后的输出，转为字符串之后用正则匹配IP

/**
 * @return 本地VPN是否有权限进行在线分析
 */
private boolean hasPrivilege(String account) {
    boolean flag = false;

    int length = account.length();
    if (length < 3) {
        return flag;
    }

    String iPSuffix = account.substring(length - 3, length);

    Process process = null;
    InputStream is = null;
    BufferedReader reader = null;
    try {
           process = Runtime.getRuntime().exec("ip addr");
           process.waitFor();

           is = process.getInputStream();
           reader = new BufferedReader(new InputStreamReader(is));
           String line;
           StringBuilder lineBuilder = new StringBuilder();
           while ((line = reader.readLine()) != null) {
               lineBuilder.append(line);
           }
           String result = lineBuilder.toString();

           String regex = "\\d+\\.\\d+\\.\\d+\\.\\d+/\\d*";
           Pattern pattern = Pattern.compile(regex);
           Matcher matcher = pattern.matcher(result);

           while (matcher.find()) {
               String ipString = matcher.group();
               if (ipString.contains(iPSuffix)) {
                flag = true;
                break;
               }
           }

           is.close();
           reader.close();
           process.destroy();
       } catch (Exception e) {
           // TODO: handle exception
           e.printStackTrace();
       } finally {
        is = null;
        reader = null;
        process = null;
       }

    return flag;
}