.net mvc 利用NPOI导入导出excel

来源：互联网发布：linux 入门基础教程编辑：程序博客网时间：2024/04/30 00:06

因近期项目做到，所以记录一下：
1、导出Excel ：
首先引用NPOI包，从这里下载》download
（Action一定要用FileResult）

/// <summary>        /// 批量导出需要导出的列表        /// </summary>        /// <returns></returns>        public FileResult ExportStu2()        {            //获取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();            //添加一个sheet            NPOI.SS.UserModel.ISheet sheet1 = book.CreateSheet("Sheet1");            //貌似这里可以设置各种样式字体颜色背景等，但是不是很方便，这里就不设置了            //给sheet1添加第一行的头部标题            NPOI.SS.UserModel.IRow row1 = sheet1.CreateRow(0);            row1.CreateCell(0).SetCellValue("编号");            row1.CreateCell(1).SetCellValue("姓名");            //....N行            //将数据逐步写入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);        }

前台直接写就可实现：

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

这里有一篇专门介绍设置样式的文章：
http://www.cnblogs.com/puzi0315/p/3265958.html
http://blog.csdn.net/xhccom/article/details/7687264
http://blog.csdn.net/bestreally/article/details/23257851
2、导入Excel：
首先说一些前台吧，mvc上传注意必须加 new { enctype = "multipart/form-data" }

<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="批量导入第一批名册" />    }</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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