NPOI导入导出Excel

.net mvc利用NPOI导入导出excel

注意：如何导出的提交方式ajax导出是失效的！

解决方案是：js处理l两个表单的提交 

代码：

 第一步. 在页面里面加入2个隐藏的iframe, 如下：
<iframe name="form_target_1" style="display:none;"></iframe>  
<iframe name="form_target_2" style="display:none;"></iframe>
第二步. 表单设置target属性：
<form name="form_1" target="form_target_1">...<form>  
<form name="form_2" target="form_target_2">...</form>
第三步. 按钮提交事件：
<button onclick="form_1.submit(); form_2.submit();">提交</button>

 

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。