excel导入 导出 兼容各个版本服务器不装EXCEL也可以

给出 demo源码： http://pan.baidu.com/s/1hqGMudY
            提取码：pw4n
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;

        }
 

/// <summary>
/// Excel导出数据
/// </summary>
/// <param name="sbHtml">html标签</param>
/// <param name="fileName">文件名</param>
public static void ExportExcel(StringBuilder sbHtml, string fileName)
{
try
{
if (sbHtml.Length > 0)
{
HttpContext.Current.Response.ContentType = "application/vnd.ms-excel";
HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.UTF8;
HttpContext.Current.Response.Charset = "Utf-8";
//HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(fileName + ".xls", System.Text.Encoding.UTF8));
HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + fileName + ".xls" );
HttpContext.Current.Response.Write(sbHtml.ToString());
HttpContext.Current.Response.End();
}
}
catch (Exception ex)
{
Logger.WriteLog("-----------Excel导出数据异常----------- " + ex.ToString() + " ");
}
}