NPOI操作EXCEL 添加报文头（AddHeader）出现下载框

NPOI官网下载：http://npoi.codeplex.com/releases

优点：不需要安装EXCEL

引用dll，使用方法：

            NPOI.HSSF.UserModel.HSSFWorkbook book = new NPOI.HSSF.UserModel.HSSFWorkbook();
            NPOI.SS.UserModel.ISheet sheet = book.CreateSheet("mySheet");
            NPOI.SS.UserModel.IRow row = sheet.CreateRow(0);
            row.CreateCell(0).SetCellValue("1");
            NPOI.SS.UserModel.IRow row2 = sheet.CreateRow(1);
            row2.CreateCell(0).SetCellValue("2");
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            book.Write(ms);
            Response.AddHeader("Content-Disposition", string.Format("attachment; filename=abc.xls"));
            Response.BinaryWrite(ms.ToArray());
            book = null;
            ms.Close();
            ms.Dispose();

本地保存：

string tempPath = @"C:\Users\Administrator\Desktop\1.xls";
FileStream file = new FileStream(tempPath, FileMode.OpenOrCreate);
book.Write(file);
file.Flush();
file.Close();

Response.AddHeader("Content-Disposition", string.Format("attachment; filename=abc.xls"));一开始我以为只能在aspx中使用这段代码，结果发现在html+ashx中也可以，只是不能用ajax的方式请求，要在前台： href="../dzxswebservice/exportTest.ashx" 使用a标签的方式请求后台。

这里:

            NPOI.HSSF.UserModel.HSSFWorkbook book = new NPOI.HSSF.UserModel.HSSFWorkbook();
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            book.Write(ms);
            context.Response.AddHeader("Content-Disposition", string.Format("attachment; filename={0}.xls", DateTime.Now.ToString("yyyyMMddHHmmssfff")));
            context.Response.BinaryWrite(ms.ToArray());

这段代码就是提供了下载的弹出框

导入：这里的HSSFWorkbook是操作的2003版本的EXCEL，如果要操作更高级的版本需要引用NPOI.OOXML。

然后把这里所有有关HSSFWorkbook类的改成XSSFWorkbook，HSSFRow改成XSSFRow

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.ISheet 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());     //标题
    }  
    while (rows.MoveNext())  
    {  
        HSSFRow row = (HSSFRow)rows.Current;  
        DataRow dr = dt.NewRow();  
        for (int i = 0; i < row.LastCellNum; i++)  
        {  
            NPOI.SS.UserModel.ICell cell = row.GetCell(i);  
            if (cell == null)  
            {  
                dr[i] = null;  
            }  
            else  
            {  
                dr[i] = cell.ToString();  
            }  
        }  
        dt.Rows.Add(dr);  
    }  
    return dt;  
}  
#endregion

LastCellNum根据最后一列有值列判断的。如果第九列有值则LastCellNum的值为9。

上面代码是把EXCEL内容转成datatable类型，下面是怎么从客户端读取EXCEL。

思路：本地上传EXCEL到服务器，再从服务器读取：

            HttpFileCollection files = context.Request.Files;
            if (files.Count > 0)
            {
                TimeSpan ts = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0);
                string name = Convert.ToInt64(ts.TotalSeconds).ToString() + ".xlsx";
                string path = context.Request.MapPath("../../../excel/" + name);
                files[0].SaveAs(path);
                DataTable dt = ImportExcelFile(path);
                new SFInfoManageBLL().InserSF(dt);
            }

设置单元格的宽：sheet.DefaultColumnWidth = 15;

设置字体：

NPOI.SS.UserModel.IFont font = book.CreateFont();
NPOI.SS.UserModel.ICellStyle style1 = book.CreateCellStyle();
font.FontName = "宋体";
font.FontHeightInPoints = 12;
font.Boldweight = (short)NPOI.SS.UserModel.FontBoldWeight.Bold;
style1.SetFont(font);
NPOI.SS.UserModel.IRow r = sheet.CreateRow(0);
NPOI.SS.UserModel.ICell c0 = r.CreateCell(0);
c0.CellStyle = style1;

普通导出：需要安装EXCEL

Microsoft.Office.Interop.Excel.Application excel = new Microsoft.Office.Interop.Excel.ApplicationClass();
            try
            {
                Microsoft.Office.Interop.Excel.Workbook book = excel.Workbooks.Add(Missing.Value); // 添加一个工作簿
                Microsoft.Office.Interop.Excel.Worksheet sheet = (Microsoft.Office.Interop.Excel.Worksheet)excel.ActiveSheet;// 获取当前工作表
                sheet.Name = "mysheet";
                for (int i = 0; i < dt.Rows.Count; i++)
                {
                    for (int j = 0; j < dt.Columns.Count; j++)
                    {
                        sheet.Cells[i + 1, j + 1] = dt.Rows[i][j];
                    }
                }

                excel.Visible = false;
                excel.DisplayAlerts = true;
                sheet.SaveAs("D:\\1.xls", Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value);

            }
            catch (Exception ex)
            {

            }
            finally
            {
                excel.Quit();
                excel = null;
            }

NPOI操作EXCEL 添加报文头（AddHeader）出现下载框

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