NPOI之C#下载Excel

public ActionResult Index()
        {

            List<string> headList = new List<string>();
            headList.Add("语文");
            headList.Add("数学");
            headList.Add("英语");
            headList.Add("政治");

            List<string> nameList = new List<string>();
            nameList.Add("张三");
            nameList.Add("李四");
            nameList.Add("王五");
            nameList.Add("赵六");
            nameList.Add("胜七");
            nameList.Add("朱重八");
            nameList.Add("九喇嘛");

            MemoryStream memoryStream = new MemoryStream();
            HSSFWorkbook workbook = new HSSFWorkbook();

            HSSFSheet sheet = workbook.CreateSheet();
            //创建单元格设置对象
            HSSFCellStyle cellStyle = workbook.CreateCellStyle();
            //设置水平、垂直居中
            cellStyle.Alignment = HSSFCellStyle.ALIGN_CENTER;
            cellStyle.VerticalAlignment = HSSFCellStyle.VERTICAL_CENTER;
            //单元格填充颜色
            cellStyle.FillForegroundColor = HSSFColor.PALE_BLUE.index;
            cellStyle.FillPattern = HSSFCellStyle.SOLID_FOREGROUND;
            //设置边框
            cellStyle.BorderBottom = HSSFCellStyle.BORDER_THIN;
            cellStyle.BorderLeft = HSSFCellStyle.BORDER_THIN;
            cellStyle.BorderRight = HSSFCellStyle.BORDER_THIN;
            cellStyle.BorderTop = HSSFCellStyle.BORDER_THIN;

            //创建设置字体对象
            HSSFFont font = workbook.CreateFont();
            font.FontHeightInPoints = 16;//设置字体大小
            font.Boldweight = short.MaxValue; //加粗
            font.FontName = "宋体";
            cellStyle.SetFont(font);


            //创建Excel行和单元格
            for (int i = 0; i < nameList.Count + 2; i++)
            {
                HSSFRow newRow = sheet.CreateRow(i);
                for (int j = 0; j <headList.Count+1; j++)
                {
                    newRow.CreateCell(j);
                }
            }

            //设置Excel表头
            sheet.AddMergedRegion(new CellRangeAddress(0, 1, 0, 0)); //起始行  结束行 起始列 结束列
            sheet.GetRow(0).GetCell(0).CellStyle = cellStyle;
            sheet.GetRow(1).GetCell(0).CellStyle = cellStyle;
            sheet.GetRow(0).GetCell(0).SetCellValue("姓名");//姓名

            sheet.AddMergedRegion(new CellRangeAddress(0, 0, 1, 4)); //起始行  结束行 起始列 结束列
            sheet.GetRow(0).GetCell(1).CellStyle = cellStyle;
            sheet.GetRow(0).GetCell(4).CellStyle = cellStyle;
            sheet.GetRow(0).GetCell(1).SetCellValue("课程");//课程

            for (int i = 0; i < headList.Count; i++)
            {
                sheet.GetRow(1).GetCell(i + 1).CellStyle = cellStyle;
                sheet.GetRow(1).GetCell(i + 1).SetCellValue(headList[i]);//具体课程
            }

            //导入数据
            for (int i = 0; i < nameList.Count; i++)
            {
                sheet.GetRow(i + 2).GetCell(0).SetCellValue(nameList[i]);
                for (int j = 0; j < 4; j++)
                {
                     sheet.GetRow(i + 2).GetCell(j+1).SetCellValue(i*j);
                }
            }

            workbook.Write(memoryStream);
            memoryStream.Seek(0,SeekOrigin.Begin);
          
            Response.Clear();
            Response.AddHeader("content-disposition", "attachment;filename=" + Server.UrlEncode("test.xls"));
            Response.ContentType = "application/octet-stream";
            Response.Charset = "gb2312";
            Response.ContentEncoding = Encoding.UTF8;
            Response.BinaryWrite(memoryStream.GetBuffer());
            Response.Flush();
            Response.End();
            return new EmptyResult();
        }