@Override
protected void service(HttpServletRequest req, HttpServletResponse resp)
        throws ServletException, IOException {
    resp.setCharacterEncoding("UTF-8");
    resp.setContentType("text/plain");

    Sheets service = GoogleAPITestServlet.getSheetService();

    Spreadsheet sheet = new Spreadsheet();
    sheet.setSpreadsheetId("testSheet");
    SpreadsheetProperties props = new SpreadsheetProperties();
    props.setTitle("샘플 시트");
    props.setLocale("ko_KR");
    sheet.setProperties(props);

    OutputStream os = resp.getOutputStream();