public static boolean nameExisted(User user, String path) throws FileNotFoundException, IOException {
        String name = user.getName();
        String pass = user.getPass();
        BufferedReader in = new BufferedReader(new FileReader(path));
        String line = in.readLine();
        while (line != null) {
            String[] te = line.split(" ");
            if (te[0].equals(name) && te[1].equals(pass)) {
                return true;
            }
            line = in.readLine();
        }
        return false;
    }