什么是NPOI

該項目是位于http://poi.apache.org/的POI Java項目的.NET版本。POI是一個開源項目，可以幫助您讀取/寫入xls，doc，ppt文件。它有著廣泛的應用。本文給大家介紹ASP.Net MVC利用NPOI導入導出Excel的問題。

因近期項目遇到所以記錄一下：

首先導出Excel：

首先引用NPOI包

（Action一定要用FileResult）

/// <summary>
/// 批量導出本校第一批派位學生
/// </summary>
/// <returns></returns>
public FileResult ExportStu2()
{
    string schoolname = "401";
    //創建Excel文件的對象
    NPOI.HSSF.UserModel.HSSFWorkbook book = new NPOI.HSSF.UserModel.HSSFWorkbook();
    //添加一個sheet
    NPOI.SS.UserModel.ISheet sheet1 = book.CreateSheet("Sheet1");
    //獲取list數據
    List<TB_STUDENTINFOModel> listRainInfo = m_BLL.GetSchoolListAATQ(schoolname);
    //給sheet1添加第一行的頭部標題
    NPOI.SS.UserModel.IRow row1 = sheet1.CreateRow(0);
    row1.CreateCell(0).SetCellValue("電腦號");
    row1.CreateCell(1).SetCellValue("姓名");
    //將數據逐步寫入sheet1各個行
    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());
    }
    // 寫入到客戶端 
    System.IO.MemoryStream ms = new System.IO.MemoryStream();
    book.Write(ms);
    ms.Seek(0, SeekOrigin.Begin);
    return File(ms, "application/vnd.ms-excel", "第一批電腦派位生名冊.xls");
}

前臺直接寫就可實現：

@Html.ActionLink("點擊導出名冊", "ExportStu2")

下面說一下導入：

首先說一些前臺吧，mvc上傳注意必須加new { enctype = "multipart/form-data" }：

<td>
2、@using(@Html.BeginForm("ImportStu", "ProSchool", FormMethod.Post, new { enctype = "multipart/form-data" }))
{
 <text>選擇上傳文件：（工作表名為“Sheet1”，“電腦號”在A1單元格。）</text>
<input name="file" type="file" id="file" />
<input type="submit" name="Upload" value="批量導入第一批電腦派位名冊" />
 }
 </td>

后臺實現：只傳路徑得出DataTable：

/// <summary>
/// Excel導入
/// </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);//第一行為標題行
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;
    }
    
}

補充一個類

/// <summary>
/// 根據Excel列類型獲取列的值
/// </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

到此這篇關于ASP.Net MVC利用NPOI導入導出Excel的示例代碼的文章就介紹到這了,更多相關ASP.Net MVC導入導出Excel內容請搜索以前的文章或繼續瀏覽下面的相關文章希望大家以后多多支持！