XSSFWorkbook workbook = new XSSFWorkbook(); //创建工作簿

        XSSFSheet sheet = (XSSFSheet)workbook.CreateSheet("test"); //创建表单

        XSSFRow headerRow = (XSSFRow)sheet.CreateRow(); //创建row

        headerRow.CreateCell().SetCellValue();

        headerRow.CreateCell().SetCellValue();

        using (MemoryStream ms = new MemoryStream())

        {

            workbook.Write(ms);

            ms.Flush();

            //Response.Write(ms);

            Response.BinaryWrite(ms.ToArray());

            Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");

            Response.AppendHeader("content-disposition", "attachment;filename=" + HttpUtility.UrlEncode("test", System.Text.Encoding.UTF8) + ".xlsx");

            Response.End();

        }