之前几篇博客介绍了NPOI的安装、导出Excel等功能,本次介绍一下导入、读取、处理Excel文件,怎么在页面导入Excel,然后把数据存储到数据库中。
封装一个操作类,通过Excel导出DataTable:
public class ExcelHelper
{
private static IWorkbook workbook = null;
private static FileStream fs = null;
/// <summary>
/// 将excel中的数据导入到DataTable中
/// </summary>
/// <param name="fileName">excel文件路径</param>
/// <param name="sheetName">excel工作薄sheet的名称</param>
/// <param name="isFirstRowColumn">第一行是否是DataTable的列名</param>
/// <returns>返回的DataTable</returns>
public static DataTable ExcelToDataTable(string fileName,string sheetName, bool isFirstRowColumn)
{
ISheet sheet = null;
DataTable data = new DataTable();
int startRow = 0;
try
{
fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
if (fileName.IndexOf(".xlsx") > 0) // 2007版本
workbook = new XSSFWorkbook(fs);
else if (fileName.IndexOf(".xls") > 0) // 2003版本
workbook = new HSSFWorkbook(fs);
if (sheetName != null)
{
sheet = workbook.GetSheet(sheetName);
if (sheet == null) //如果没有找到指定的sheetName对应的sheet,则尝试获取第一个sheet
{
sheet = workbook.GetSheetAt(0);
}
}
else
{
sheet = workbook.GetSheetAt(0);
}
if (sheet != null)
{
IRow firstRow = sheet.GetRow(0);
int cellCount = firstRow.LastCellNum; //一行最后一个cell的编号 即总的列数
if (isFirstRowColumn)
{
for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
{
ICell cell = firstRow.GetCell(i);
if (cell != null)
{
string cellValue = cell.StringCellValue;
if (cellValue != null)
{
DataColumn column = new DataColumn(cellValue);
data.Columns.Add(column);
}
}
}
startRow = sheet.FirstRowNum + 1;
}
else
{
for (int i = firstRow.FirstCellNum; i < cellCount; i++)
{
DataColumn column = new DataColumn(i.ToString());
data.Columns.Add(column);
}
startRow = sheet.FirstRowNum;
}
//最后一列的标号
int rowCount = sheet.LastRowNum;
for (int i = startRow; i <= rowCount; ++i)
{
IRow row = sheet.GetRow(i);
if (row == null) continue; //没有数据的行默认是null
DataRow dataRow = data.NewRow();
for (int j = row.FirstCellNum; j < cellCount; ++j)
{
if (row.GetCell(j) != null) //同理,没有数据的单元格都默认是null
dataRow[j] = row.GetCell(j).ToString();
}
data.Rows.Add(dataRow);
}
}
return data;
}
catch (Exception ex)
{
Console.WriteLine("Exception: " + ex.Message);
return null;
}
}
}
前台接收一下excel,保存之后转换为datatable
DataTable dt = new DataTable();
if (Request.Files.Count > 0)
{
string path = FileHelper.UploadFiles("ExcelData", "ImportData");//帮助类,返回文件路径
dt = ExcelHelper.ExcelToDataTable(System.Web.HttpContext.Current.Server.MapPath(path),null,true);
}
这样就实现了,上传excel,得到datatable的功能,后续是怎么处理数据,存储或者其他,可以根据实际需要来处理。