using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
#region NPOI
using NPOI.HSSF.UserModel;
using NPOI.HSSF.Util;
using NPOI.SS.UserModel;
using System.Web;
using System.IO;
using System.Data;
using System.Collections;
using System.Web.UI.WebControls;
#endregion
/*========================================================================================
*
*
* 说 明：导入、导出Excel
* 作 者：李朝强
* 日 期：2015/03/28
*
*
* =====================================================================================*/
namespace TiKu.Common.Office
{
public class Excel
{
#region ===============================================导出==================================
/// <summary>
/// 导出
/// </summary>
/// <param name="context">请求上下文</param>
/// <param name="fileName">导出文件的名</param>
/// <param name="stream">数据流</param>
public void Export(HttpContext context,
string fileName,
MemoryStream stream)
{
if (context.Request.Browser.Browser == "IE")
fileName = HttpUtility.UrlEncode(fileName);
context.Response.AddHeader("Content-Disposition", "attachment;fileName=" + fileName);
context.Response.BinaryWrite(stream.ToArray());
}
/// <summary>
/// 导出
/// </summary>
/// <param name="context">上下文</param>
/// <param name="filename">导出的文件名</param>
/// <param name="data">数据</param>
public void Export(HttpContext context,
string filename,
string sheetName,
Hashtable hashColumnInfos,
DataTable data)
{
MemoryStream ms = null;
try
{
ms = ReadToExcel(data,
sheetName,
hashColumnInfos);
//执行导出
Export(context, filename, ms);
}
catch (Exception ex) { throw ex; }
finally
{
if (null != ms)
{
ms.Close();
ms.Dispose();
}
}
}
/// <summary>
/// 从Repeat控件中，导出Excel
/// </summary>
/// <param name="RepList">控件</param>
/// <param name="filename">文件名</param>
/// <param name="sheetName">工作表</param>
public void Export(Repeater RepList,
string filename,
string sheetName,
HttpContext context)
{
object data = RepList.DataSource;
if (data is DataTable)
{
Export(context,
filename,
sheetName,
null,
(DataTable)data);
return;
}
if (data is DataView)
{
return;
}
if (data is IList)
{
return;
}
}
#endregion
#region ================================================数据流========================================
/// <summary>
/// 把DataTable对象，读取到内存流中
/// </summary>
/// <param name="data">DataTable对象</param>
/// <param name="hashColumnInfos">（可选）列</param>
/// <returns></returns>
public MemoryStream ReadToExcel(DataTable data,
string sheetName,
Hashtable hashColumnInfos)
{
sheetName = string.IsNullOrEmpty(sheetName) ? string.Format("Sheet-{0:yyy/MM/dd}", DateTime.Now) : sheetName;
//0>内存流
MemoryStream ms = new MemoryStream();
//1>创建工作薄
IWorkbook __workbook = new HSSFWorkbook();
//2>创建工作表
ISheet __sheet = __workbook.CreateSheet(sheetName);
#region 单元格样式
//单元格样式
ICellStyle cellStyle = __workbook.CreateCellStyle();
cellStyle.FillPattern = FillPattern.SolidForeground;
cellStyle.FillBackgroundColor = NPOI.HSSF.Util.HSSFColor.Green.Index;
//设置字体
IFont font = __workbook.CreateFont();
font.Color = NPOI.HSSF.Util.HSSFColor.White.Index;
cellStyle.SetFont(font);
cellStyle.FillForegroundColor = NPOI.HSSF.Util.HSSFColor.Green.Index;
#endregion
#region 3>创建表头
//创建一行
IRow __header = __sheet.CreateRow(0);
if (null == hashColumnInfos)
{
for (int i = 0; i < data.Columns.Count; i++)
{
//创建单元格
ICell __cell = __header.CreateCell(i);
__cell.SetCellValue(data.Columns[i].ColumnName);
__sheet.SetColumnWidth(i, 20 * 256);
__cell.CellStyle = cellStyle;
}
}
else
{
int j = 0;
foreach (DictionaryEntry item in hashColumnInfos)
{
//创建单元格
ICell __cell = __header.CreateCell(j);
__cell.SetCellValue(item.Value.ToString());
__sheet.SetColumnWidth(j, 20 * 256);
__cell.CellStyle = cellStyle;
++j;
}
}
#endregion
#region 4>创建数据行
int c = 0;
for (int k = 0; k < data.Rows.Count; k++)
{
IRow __dataRow = __sheet.CreateRow(k + 1);
for (c = 0; c < data.Columns.Count; c++)
{
ICell iCell = __dataRow.CreateCell(c);
iCell.SetCellValue(data.Rows[k][data.Columns[c].ColumnName].ToString());
c++;
}
c = 0;
}
#endregion
//5>最后，写入内存流
__workbook.Write(ms);
return ms;
}
/// <summary>
/// 把IDataReader对象，读取到内存流中
/// </summary>
/// <param name="dataReader">IDataReader对象</param>
/// <param name="sheetName">工作表名称</param>
/// <param name="hashColumnInfos">列</param>
/// <returns></returns>
public MemoryStream ReadToExcel(IDataReader dataReader,
string sheetName,
Hashtable hashColumnInfos)
{
//0>内存流
MemoryStream ms = new MemoryStream();
//1>创建工作薄
IWorkbook __workbook = new HSSFWorkbook();
//2>创建工作表
ISheet __sheet = __workbook.CreateSheet(sheetName);
#region 3>表头
IRow __header = __sheet.CreateRow(0);
if (null == hashColumnInfos)
{
for (int i = 0; i < dataReader.FieldCount; i++)
{
ICell iHeaderCell = __header.CreateCell(i);
iHeaderCell.SetCellValue(dataReader.GetName(i));
}
}
else
{
int j = 0;
foreach (DictionaryEntry item in hashColumnInfos)
{
//创建单元格
ICell __cell = __header.CreateCell(j);
__cell.SetCellValue(item.Value.ToString());
++j;
}
}
#endregion
#region 4>数据行
int n = 1;
while (dataReader.Read())
{
IRow __dataRow = __sheet.CreateRow(n);
for (int c = 0; c < dataReader.FieldCount; c++)
{
ICell iCell = __dataRow.CreateCell(c);
iCell.SetCellValue((dataReader.GetValue(c) ?? "").ToString());
}
}
#endregion
//5>写入内存流
__workbook.Write(ms);
return ms;
}
#endregion
}
}
来源：http://www.cnblogs.com/ibeisha/p/npoi.html