public void ExportByWeb2(DataTable dtSource, string strHeaderText, string strFileName)
{
HttpContext curContext = HttpContext.Current;
// 设置编码和附件格式
curContext.Response.ContentType = “application/vnd.ms-excel”;
curContext.Response.ContentEncoding = Encoding.UTF8;
curContext.Response.Charset = “”;
curContext.Response.AppendHeader(“Content-Disposition”,
“attachment;filename=” + HttpUtility.UrlEncode(strFileName, Encoding.UTF8));
curContext.Response.BinaryWrite(Export2(dtSource, strHeaderText).GetBuffer());
curContext.Response.End();
}

public MemoryStream Export2(DataTable dtSource, string strHeaderText)
{
HSSFWorkbook workbook = new HSSFWorkbook();
HSSFSheet sheet = workbook.CreateSheet();
#region 右击文件 属性信息
{
DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation();
dsi.Company = “NPOI”;
workbook.DocumentSummaryInformation = dsi;
SummaryInformation si = PropertySetFactory.CreateSummaryInformation();
si.Author = “文件作者信息”; //填加xls文件作者信息
si.ApplicationName = “创建程序信息”; //填加xls文件创建程序信息
si.LastAuthor = “最后保存者信息”; //填加xls文件最后保存者信息
si.Comments = “作者信息”; //填加xls文件作者信息
si.Title = “标题信息”; //填加xls文件标题信息
si.Subject = “主题信息”;//填加文件主题信息
si.CreateDateTime = DateTime.Now;
workbook.SummaryInformation = si;
}
#endregion
HSSFCellStyle dateStyle = workbook.CreateCellStyle();
HSSFDataFormat format = workbook.CreateDataFormat();
dateStyle.DataFormat = format.GetFormat(“yyyy-mm-dd”);
//取得列宽
int[] arrColWidth = new int[dtSource.Columns.Count];
foreach (DataColumn item in dtSource.Columns)
{
arrColWidth[item.Ordinal] = Encoding.GetEncoding(936).GetBytes(item.ColumnName.ToString()).Length;
}
for (int i = 0; i < dtSource.Rows.Count; i++)
{
for (int j = 0; j < dtSource.Columns.Count; j++)
{
int intTemp = Encoding.GetEncoding(936).GetBytes(dtSource.Rows[i][j].ToString()).Length;
if (intTemp > arrColWidth[j])
{
arrColWidth[j] = intTemp;
}
}
}
int rowIndex = 0;
foreach (DataRow row in dtSource.Rows)
{
#region 新建表，填充表头，填充列头，样式
if (rowIndex == 65535 || rowIndex == 0)
{
if (rowIndex != 0)
{
sheet = workbook.CreateSheet();
}
#region 表头及样式
{
//HSSFRow headerRow = sheet.CreateRow(0);
//headerRow.HeightInPoints = 25;
//headerRow.CreateCell(0).SetCellValue(strHeaderText);
//HSSFCellStyle headStyle = workbook.CreateCellStyle();
//headStyle.Alignment = CellHorizontalAlignment.CENTER;
//HSSFFont font = workbook.CreateFont();
//font.FontHeightInPoints = 20;
//font.Boldweight = 700;
//headStyle.SetFont(font);
//headerRow.GetCell(0).CellStyle = headStyle;
//sheet.AddMergedRegion(new Region(0, 0, 0, dtSource.Columns.Count - 1));
//headerRow.Dispose();
}
#endregion
#region 列头及样式
{
HSSFRow headerRow = sheet.CreateRow(0);
HSSFCellStyle headStyle = workbook.CreateCellStyle();
headStyle.Alignment = CellHorizontalAlignment.CENTER;
HSSFFont font = workbook.CreateFont();
font.FontHeightInPoints = 10;
font.Boldweight = 700;
headStyle.SetFont(font);
foreach (DataColumn column in dtSource.Columns)
{
headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
headerRow.GetCell(column.Ordinal).CellStyle = headStyle;
//设置列宽
sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal] + 1) * 856);
}
headerRow.Dispose();
}
#endregion
rowIndex = 1;
}
#endregion
#region 填充内容
HSSFRow dataRow = sheet.CreateRow(rowIndex);
foreach (DataColumn column in dtSource.Columns)
{
HSSFCell newCell = dataRow.CreateCell(column.Ordinal);
string drValue = row[column].ToString();
switch (column.DataType.ToString())
{
case “System.String”