.net mvc利用NPOI导入导出excel

/// <summary> /// 批量导出需要导出的列表 /// </summary> /// <returns></returns> public FileResult ExportStu2() { //获得list数据 var checkList = (from oc in db.OrganizeCustoms join o in db.Organizes.DefaultIfEmpty() on oc.custom_id equals o.id where oc.organize_id == 1 select new { customer_id = o.id,customer_name = o.name }).ToList(); //创建Excel文件的对象 NPOI.HSSF.UserModel.HSSFWorkbook book = new NPOI.HSSF.UserModel.HSSFWorkbook(); //添加1个sheet NPOI.SS.UserModel.ISheet sheet1 = book.CreateSheet("Sheet1"); //貌似这里可以设置各种样式字体色彩背景等，但是否是很方便，这里就不设置了 //给sheet1添加第1行的头部标题 NPOI.SS.UserModel.IRow row1 = sheet1.CreateRow(0); row1.CreateCell(0).SetCellValue("编号"); row1.CreateCell(1).SetCellValue("姓名"); //....N行 //将数据逐渐写入sheet1各个行 for (int i = 0; i < checkList.Count; i++) { NPOI.SS.UserModel.IRow rowtemp = sheet1.CreateRow(i + 1); rowtemp.CreateCell(0).SetCellValue(checkList[i].customer_id.ToString()); rowtemp.CreateCell(1).SetCellValue(checkList[i].customer_name.ToString()); //....N行 } // 写入到客户端 System.IO.MemoryStream ms = new System.IO.MemoryStream(); book.Write(ms); ms.Seek(0,SeekOrigin.Begin); DateTime dt = DateTime.Now; string dateTime = dt.ToString("yyMMddHHmmssfff"); string fileName = "查询结果" + dateTime + ".xls"; return File(ms,"application/vnd.ms-excel",fileName); }

@Html.ActionLink("点击导出Excel","ExportStu2")

<td> @using (@Html.BeginForm("ImportStu","ProSchool",FormMethod.Post,new { enctype = "multipart/form-data" })) { <text>选择上传文件：（工作表名为“Sheet1”，“电脑号”在A1单元格。）</text> <input name="file" type="file" id="file" /> <input type="submit" name="Upload" value="批量导入第1批名册" /> } </td>

/// <summary> /// Excel导入 /// </summary> /// <param name="filePath"></param> /// <returns></returns> public DataTable ImportExcelFile(string filePath) { HSSFWorkbook hssfworkbook; #region//初始化信息 try { using (FileStream file = new FileStream(filePath,FileMode.Open,FileAccess.Read)) { hssfworkbook = new HSSFWorkbook(file); } } catch (Exception e) { throw e; } #endregion using (NPOI.SS.UserModel.ISheet sheet = hssfworkbook.GetSheetAt(0)) { DataTable table = new DataTable(); IRow headerRow = sheet.GetRow(0);//第1行动标题行 int cellCount = headerRow.LastCellNum;//LastCellNum = PhysicalNumberOfCells int rowCount = sheet.LastRowNum;//LastRowNum = PhysicalNumberOfRows - 1 //handling header. for (int i = headerRow.FirstCellNum; i < cellCount; i++) { DataColumn column = new DataColumn(headerRow.GetCell(i).StringCellValue); table.Columns.Add(column); } for (int i = (sheet.FirstRowNum + 1); i <= rowCount; i++) { IRow row = sheet.GetRow(i); DataRow dataRow = table.NewRow(); if (row != null) { for (int j = row.FirstCellNum; j < cellCount; j++) { if (row.GetCell(j) != null) dataRow[j] = GetCellValue(row.GetCell(j)); } } table.Rows.Add(dataRow); } return table; } }

/// <summary> /// 根据Excel列类型获得列的值 /// </summary> /// <param name="cell">Excel列</param> /// <returns></returns> private static string GetCellValue(ICell cell) { if (cell == null){ return string.Empty; } switch (cell.CellType) { case CellType.BLANK: return string.Empty; case CellType.BOOLEAN: return cell.BooleanCellValue.ToString(); case CellType.ERROR: return cell.ErrorCellValue.ToString(); case CellType.NUMERIC: case CellType.Unknown: default: return cell.ToString();//This is a trick to get the correct value of the cell. NumericCellValue will return a numeric value no matter the cell value is a date or a number case CellType.STRING: return cell.StringCellValue; case CellType.FORMULA: try { HSSFFormulaEvaluator e = new HSSFFormulaEvaluator(cell.Sheet.Workbook); e.EvaluateInCell(cell); return cell.ToString(); } catch { return cell.NumericCellValue.ToString(); } } }