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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