一、下载引用
目前官网不能直接下载到引用的dll，需要自己打包（我没有自己打包，我有现成的DLL，地址：https://files.cnblogs.com/files/dengxixi/NPOIdll.7z），即：NPOI.dll，NPOI.OOXML.dll，NPOI.OpenXml4Net.dll，ICSharpCode.SharpZipLib.dll（office2007版需要此dll）。
二、创建MVC项目，页面代码：
<html>
<head>
<meta name="viewport" content="width=device-width" />
<title>使用NPOI导入excel</title>
<script src="Scripts/jquery-1.8.2.min.js"></script>
<style>
.myFileUpload {
position: absolute;
display: block;
width: 100px;
height: 40px;
opacity: 0;
}
</style>
</head>
<body>
<div class="container">
<form class="form-horizontal" action="~/Home/Upload" role="form" method="post" enctype="multipart/form-data">
<table style="margin:5px;height:70px;">
<tr>
<td>请选择文件：</td>
<td width="5px;"></td>
<td><input type="file" id="fileUpload" name="fileUpload"></td>
<td><input id="fileText" type="text" class="myFileUpload" disabled="disabled" /></td>
<td><button type="submit">上传</button></td>
</tr>
</table>
</form>
</div>
</body>
</html>
三、EXCEL转为为datatable类，网上百度的，改了下，因为没有判断excel的版本
public class ExcelHelper
{
/// <summary>读取excel 到datatable
/// 默认第一行为表头，导入第一个工作表
/// </summary>
/// <param name="strFileName">excel文档路径</param>
/// <returns></returns>
public static DataTable ExcelToDataTable(string strFileName)
{
DataTable dt = new DataTable();
FileStream file = null;
IWorkbook Workbook = null;
try
{
using (file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))//C#文件流读取文件
{
if (strFileName.IndexOf(".xlsx") > 0)
//把xlsx文件中的数据写入Workbook中
Workbook = new XSSFWorkbook(file);
else if (strFileName.IndexOf(".xls") > 0)
//把xls文件中的数据写入Workbook中
Workbook = new HSSFWorkbook(file);
if (Workbook != null)
{
ISheet sheet = Workbook.GetSheetAt(0);//读取第一个sheet
System.Collections.IEnumerator rows = sheet.GetRowEnumerator();
//得到Excel工作表的行
IRow headerRow = sheet.GetRow(0);
//得到Excel工作表的总列数
int cellCount = headerRow.LastCellNum;
for (int j = 0; j < cellCount; j++)
{
//得到Excel工作表指定行的单元格
ICell cell = headerRow.GetCell(j);
dt.Columns.Add(cell.ToString());
}
for (int i = (sheet.FirstRowNum + 1); i <= sheet.LastRowNum; i++)
{
IRow row = sheet.GetRow(i);
DataRow dataRow = dt.NewRow();
for (int j = row.FirstCellNum; j < cellCount; j++)
{
if (row.GetCell(j) != null)
dataRow[j] = row.GetCell(j).ToString();
}
dt.Rows.Add(dataRow);
}
}
return dt;
}
}
catch (Exception)
{
if (file != null)
{
file.Close();//关闭当前流并释放资源
}
return null;
}
}
/// <summary>
/// 从Excel中获取数据到DataTable
/// </summary>
/// <param name="strFileName">Excel文件全路径(服务器路径)</param>
/// <param name="SheetName">要获取数据的工作表名称</param>
/// <param name="HeaderRowIndex">工作表标题行所在行号(从0开始)</param>
/// <returns></returns>
public static DataTable RenderDataTableFromExcel(string strFileName, string SheetName, int HeaderRowIndex)
{
IWorkbook Workbook = null;
using (FileStream file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))
{
if (strFileName.IndexOf(".xlsx") > 0)
Workbook = new XSSFWorkbook(file);
else if (strFileName.IndexOf(".xls") > 0)
Workbook = new HSSFWorkbook(file);
ISheet sheet = Workbook.GetSheet(SheetName);
return RenderDataTableFromExcel(Workbook, SheetName, HeaderRowIndex);
}
}
/// <summary>
/// 从Excel中获取数据到DataTable
/// </summary>
/// <param name="workbook">要处理的工作薄</param>
/// <param name="SheetName">要获取数据的工作表名称</param>
/// <param name="HeaderRowIndex">工作表标题行所在行号(从0开始)</param>
/// <returns></returns>
public static DataTable RenderDataTableFromExcel(IWorkbook workbook, string SheetName, int HeaderRowIndex)
{
ISheet sheet = workbook.GetSheet(SheetName);
DataTable table = new DataTable();
try
{
IRow headerRow = sheet.GetRow(HeaderRowIndex);
int cellCount = headerRow.LastCellNum;
for (int i = headerRow.FirstCellNum; i < cellCount; i++)
{
DataColumn column = new DataColumn(headerRow.GetCell(i).StringCellValue);
table.Columns.Add(column);
}
int rowCount = sheet.LastRowNum;
#region 循环各行各列,写入数据到DataTable
for (int i = (sheet.FirstRowNum + 1); i <= sheet.LastRowNum; i++)
{
IRow row = sheet.GetRow(i);
DataRow dataRow = table.NewRow();
for (int j = row.FirstCellNum; j < cellCount; j++)
{
ICell cell = row.GetCell(j);
if (cell == null)
{
dataRow[j] = null;
}
else
{
//dataRow[j] = cell.ToString();
switch (cell.CellType)
{
case CellType.Blank:
dataRow[j] = null;
break;
case CellType.Boolean:
dataRow[j] = cell.BooleanCellValue;
break;
case CellType.Numeric:
dataRow[j] = cell.ToString();
break;
case CellType.String:
dataRow[j] = cell.StringCellValue;
break;
case CellType.Error:
dataRow[j] = cell.ErrorCellValue;
break;
case CellType.Formula:
default:
dataRow[j] = "=" + cell.CellFormula;
break;
}
}
}
table.Rows.Add(dataRow);
//dataRow[j] = row.GetCell(j).ToString();
}
#endregion
}
catch (System.Exception ex)
{
table.Clear();
table.Columns.Clear();
table.Columns.Add("出错了");
DataRow dr = table.NewRow();
dr[0] = ex.Message;
table.Rows.Add(dr);
return table;
}
finally
{
//sheet.Dispose();
workbook = null;
sheet = null;
}
#region 清除最后的空行
for (int i = table.Rows.Count - 1; i > 0; i--)
{
bool isnull = true;
for (int j = 0; j < table.Columns.Count; j++)
{
if (table.Rows[i][j] != null)
{
if (table.Rows[i][j].ToString() != "")
{
isnull = false;
break;
}
}
}
if (isnull)
{
table.Rows[i].Delete();
}
}
#endregion
return table;
}
}
四、调用方法
public string Upload(HttpPostedFileBase fileUpload)
{
if (fileUpload == null)
{
return "文件为空";
}
try
{
//将硬盘路径转化为服务器路径的文件流
string fileName = Path.Combine(Request.MapPath("~/SaveFile"), Path.GetFileName(fileUpload.FileName));
//NPOI得到EXCEL的第一种方法
fileUpload.SaveAs(fileName);
DataTable dtData = ExcelHelper.ExcelToDataTable(fileName);
//得到EXCEL的第二种方法(第一个参数是文件流,第二个是excel标签名,第三个是第几行开始读0算第一行)
DataTable dtData2 = ExcelHelper.RenderDataTableFromExcel(fileName, fileUpload.FileName, 0);
return "导入成功";
}
catch
{
return "导入失败";
}
}
五、调试截图及excel 数据截图：
以上就是把excel转化为datatable的方法。转化为datatable之后就可以进行插入数据库或者显示到页面了。
原文地址：https://www.cnblogs.com/dengxixi/p/9036187.html
时间： 2024-08-09 17:55:09