@Override
protected void buildExcelDocument( Map<String, Object> model, Workbook workbook, HttpServletRequest request, HttpServletResponse response) {
createExcel(workbook, model);
response.setContentType("ms-vnd/excel");
response.setHeader("Content-Disposition", "attachment;filename=example.xlsx");
try {
ServletOutputStream out = response.getOutputStream();
workbook.write(out);
out.flush();
} catch (IOException e) {
e.printStackTrace();
}
}