EXCLE 导入 或 导出

首先要引用 NPOI.dll   （可在网上下载！）
//导入
public void OnSubmit()
        {
            string path = Server.MapPath("/upload/201410/27/201410271103461051.xls");
            FileStream fs = File.Open(path, FileMode.Open);
            System.Data.DataTable dt = ConvertToDataTable(fs);
            
            foreach (DataRow row in dt.Rows)
            {
                if (row["Mobile1"] != null)
                {
                    Response.Write(row["Mobile1"].ToString() + " " + row["Mobile2"].ToString() + "
");
                }
            }
            Response.End();
        }


//excel转DataTable
public static DataTable ConvertToDataTable(System.IO.Stream excelFileStream)
        {
            HSSFWorkbook HSSFWorkbook = new HSSFWorkbook(excelFileStream);
            DataTable dt = new DataTable();
            HSSFSheet sheet = (HSSFSheet)HSSFWorkbook.GetSheetAt(0);
            System.Collections.IEnumerator rows = sheet.GetRowEnumerator();
            int n = 0;
            while (rows.MoveNext())
            {
                HSSFRow row = (HSSFRow)rows.Current;
                if (n == 0)
                {
                    for (int i = 0; i < row.LastCellNum; i++)
                    {
                        HSSFCell cell = (HSSFCell)row.GetCell(i);
                        if (cell == null)
                            continue;
                        DataColumn column = new DataColumn(cell.StringCellValue);

                        dt.Columns.Add(column);
                    }
                }
                else
                {
                    DataRow dtRow = dt.NewRow();
                    string rValue = "";
                    for (int i = 0, j = 0; i < row.LastCellNum; i++)
                    {
                        HSSFCell cell = (HSSFCell)row.GetCell(i);
                        if (cell == null)
                        {
                            dtRow[i] = "";
                        }
                        else
                        {
                            dtRow[j] = cell.ToString();
                            rValue = cell.ToString();
                            j++;
                        }
                    }
                    if (string.IsNullOrEmpty(rValue.Trim()))
                        break;
                    dt.Rows.Add(dtRow);
                }
                n++;
            }
            return dt;

        }
 
//导出
///

        /// 将明细表导出到Excel

        ///

        ///
要导入到Excel中的中文表头的Sql,将需要的字段通过sql as成中文名
///

/// 1 成功 -1失败
protected int ExportToExcel(string sql, HttpResponse response)
{
DataTable dt = CommOtherBLL.ExportToExcel(sql); //要导出的表
if (dt != null && dt.Rows.Count > 0)
{
StringBuilder strContent = new StringBuilder();
for (int i = 0; i < dt.Columns.Count; i++)
strContent.Append(dt.Columns[i] + "\t");
strContent.Append("\n");
for (int i = 0; i < dt.Rows.Count; i++)
{
for (int y = 0; y < dt.Columns.Count; y++)
strContent.Append(dt.Rows[i][y] + "\t");
strContent.Append("\n");
}
response.AddHeader("Content-Disposition", "attachment; filename=" + System.Web.HttpUtility.UrlEncode("excel", System.Text.Encoding.UTF8) + ".xls");
response.ContentType = "application/ms-excel";
response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
response.Write(strContent.ToString());
response.End();
return 1;
}
else
return -1;
}