ASP.Net MVC利用NPOI导入导出Excel的示例代码
什么是NPOI
该项目是位于http://poi.apache.org/的POI Java项目的.NET版本。POI是一个开源项目，可以帮助您读取/写入xls，doc，ppt文件。它有着广泛的应用。本文给大家介绍ASP.Net MVC利用NPOI导入导出Excel的问题。
因近期项目遇到所以记录一下：
首先导出Excel：
首先引用NPOI包
（Action一定要用FileResult）
/// <summary> /// 批量导出本校第一批派位学生 /// </summary> /// <returns></returns> public FileResult ExportStu2() { string schoolname = "401"; //创建Excel文件的对象 NPOI.HSSF.UserModel.HSSFWorkbook book = new NPOI.HSSF.UserModel.HSSFWorkbook(); //添加一个sheet NPOI.SS.UserModel.ISheet sheet1 = book.CreateSheet("Sheet1"); //获取list数据 List<TB_STUDENTINFOModel> listRainInfo = m_BLL.GetSchoolListAATQ(schoolname); //给sheet1添加第一行的头部标题 NPOI.SS.UserModel.IRow row1 = sheet1.CreateRow(0); row1.CreateCell(0).SetCellValue("电脑号"); row1.CreateCell(1).SetCellValue("姓名"); //将数据逐步写入sheet1各个行 for (int i = 0; i < listRainInfo.Count; i++) { NPOI.SS.UserModel.IRow rowtemp = sheet1.CreateRow(i + 1); rowtemp.CreateCell(0).SetCellValue(listRainInfo[i].ST_CODE.ToString()); rowtemp.CreateCell(1).SetCellValue(listRainInfo[i].ST_NAME.ToString()); } // 写入到客户端 System.IO.MemoryStream ms = new System.IO.MemoryStream(); book.Write(ms); ms.Seek(0, SeekOrigin.Begin); return File(ms, "application/vnd.ms-excel", "第一批电脑派位生名册.xls"); }前台直接写就可实现：
@Html.ActionLink("点击导出名册", "ExportStu2")下面说一下导入：
首先说一些前台吧，mvc上传注意必须加new { enctype = "multipart/form-data" }：
<td>2、@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="批量导入第一批电脑派位名册" /> } </td>后台实现：只传路径得出DataTable：
/// <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);//第一行为标题行 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; } }补充一个类
/// <summary> /// 根据Excel列类型获取列的值 /// </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(); } } }得到DataTable后，就想怎么操作就怎么操作了
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