Asp.net操作Excel----NPOI

先去官网：http://npoi.codeplex.com/下载需要引入dll（可以选择.net2.0或者.net4.0的dll），然后在网站中添加引用。

导出代码：

NPOI.HSSF.UserModel.HSSFWorkbook book = new NPOI.HSSF.UserModel.HSSFWorkbook();
NPOI.SS.UserModel.ISheet sheet = book.CreateSheet("test_01");

// 第一列
NPOI.SS.UserModel.IRow row = sheet.CreateRow(0);
row.CreateCell(0).SetCellValue("第一列第一行");

// 第二列
NPOI.SS.UserModel.IRow row2 = sheet.CreateRow(1);
row2.CreateCell(0).SetCellValue("第二列第一行");

// ...

// 写入到客户端  
System.IO.MemoryStream ms = new System.IO.MemoryStream();
book.Write(ms);
Response.AddHeader("Content-Disposition", string.Format("attachment; filename={0}.xls", DateTime.Now.ToString("yyyyMMddHHmmssfff")));
Response.BinaryWrite(ms.ToArray());
book = null;
ms.Close();
ms.Dispose();

导入代码：

HSSFWorkbook hssfworkbook;  
#region  
public DataTable ImportExcelFile(string filePath)  
{  
    #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  
  
    NPOI.SS.UserModel.Sheet sheet = hssfworkbook.GetSheetAt(0);  
    System.Collections.IEnumerator rows = sheet.GetRowEnumerator();  
    DataTable dt = new DataTable();  
    for (int j = 0; j < (sheet.GetRow(0).LastCellNum); j++)  
    {  
        dt.Columns.Add(Convert.ToChar(((int)'A') + j).ToString());  
    }  
    while (rows.MoveNext())  
    {  
        HSSFRow row = (HSSFRow)rows.Current;  
        DataRow dr = dt.NewRow();  
        for (int i = 0; i < row.LastCellNum; i++)  
        {  
            NPOI.SS.UserModel.Cell cell = row.GetCell(i);  
            if (cell == null)  
            {  
                dr[i] = null;  
            }  
            else  
            {  
                dr[i] = cell.ToString();  
            }  
        }  
        dt.Rows.Add(dr);  
    }  
    return dt;  
}  
#endregion