NPOI简介：http://www.cnblogs.com/tonyqus/archive/2009/03/16/1409966.html
NPOI官网：http://npoi.codeplex.com/
实例下载：https://files.cnblogs.com/zhengjuzhuan/NPOIHelper.rar
Excel生成操作类：
代码
using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using NPOI;
using NPOI.HPSF;
using NPOI.HSSF;
using NPOI.HSSF.UserModel;
using System.Data;
namespace StarTech.NPOI
{
/// <summary>
/// Excel生成操作类
/// </summary>
public class NPOIHelper
{
/// <summary>
/// 导出列名
/// </summary>
public static System.Collections.SortedList ListColumnsName;
/// <summary>
/// 导出Excel
/// </summary>
/// <param name="dgv"></param>
/// <param name="filePath"></param>
public static void ExportExcel(DataTable dtSource, string filePath)
{
if (ListColumnsName == null || ListColumnsName.Count == 0)
throw (new Exception("请对ListColumnsName设置要导出的列明！"));
HSSFWorkbook excelWorkbook = CreateExcelFile();
InsertRow(dtSource, excelWorkbook);
SaveExcelFile(excelWorkbook, filePath);
}
/// <summary>
/// 导出Excel
/// </summary>
/// <param name="dgv"></param>
/// <param name="filePath"></param>
public static void ExportExcel(DataTable dtSource, Stream excelStream)
{
if (ListColumnsName == null || ListColumnsName.Count == 0)
throw (new Exception("请对ListColumnsName设置要导出的列明！"));
HSSFWorkbook excelWorkbook = CreateExcelFile();
InsertRow(dtSource, excelWorkbook);
SaveExcelFile(excelWorkbook, excelStream);
}
/// <summary>
/// 保存Excel文件
/// </summary>
/// <param name="excelWorkBook"></param>
/// <param name="filePath"></param>
protected static void SaveExcelFile(HSSFWorkbook excelWorkBook, string filePath)
{
FileStream file = null;
try
{
file = new FileStream(filePath, FileMode.Create);
excelWorkBook.Write(file);
}
finally
{
if (file != null)
{
file.Close();
}
}
}
/// <summary>
/// 保存Excel文件
/// </summary>
/// <param name="excelWorkBook"></param>
/// <param name="filePath"></param>
protected static void SaveExcelFile(HSSFWorkbook excelWorkBook, Stream excelStream)
{
try
{
excelWorkBook.Write(excelStream);
}
finally
{
}
}
/// <summary>
/// 创建Excel文件
/// </summary>
/// <param name="filePath"></param>
protected static HSSFWorkbook CreateExcelFile()
{
HSSFWorkbook hssfworkbook = new HSSFWorkbook();
return hssfworkbook;
}
/// <summary>
/// 创建excel表头
/// </summary>
/// <param name="dgv"></param>
/// <param name="excelSheet"></param>
protected static void CreateHeader(HSSFSheet excelSheet)
{
int cellIndex = 0;
//循环导出列
foreach (System.Collections.DictionaryEntry de in ListColumnsName)
{
HSSFRow newRow = excelSheet.CreateRow(0);
HSSFCell newCell = newRow.CreateCell(cellIndex);
newCell.SetCellValue(de.Value.ToString());
cellIndex++;
}
}
/// <summary>
/// 插入数据行
/// </summary>
protected static void InsertRow(DataTable dtSource, HSSFWorkbook excelWorkbook)
{
int rowCount = 0;
int sheetCount = 1;
HSSFSheet newsheet = null;
//循环数据源导出数据集
newsheet = excelWorkbook.CreateSheet("Sheet" + sheetCount);
CreateHeader(newsheet);
foreach (DataRow dr in dtSource.Rows)
{
rowCount++;
//超出10000条数据 创建新的工作簿
if (rowCount == 10000)
{
rowCount = 1;
sheetCount++;
newsheet = excelWorkbook.CreateSheet("Sheet" + sheetCount);
CreateHeader(newsheet);
}
HSSFRow newRow = newsheet.CreateRow(rowCount);
InsertCell(dtSource, dr, newRow, newsheet, excelWorkbook);
}
}
/// <summary>
/// 导出数据行
/// </summary>
/// <param name="dtSource"></param>
/// <param name="drSource"></param>
/// <param name="currentExcelRow"></param>
/// <param name="excelSheet"></param>
/// <param name="excelWorkBook"></param>
protected static void InsertCell(DataTable dtSource, DataRow drSource, HSSFRow currentExcelRow, HSSFSheet excelSheet, HSSFWorkbook excelWorkBook)
{
for (int cellIndex = 0; cellIndex < ListColumnsName.Count; cellIndex++)
{
//列名称
string columnsName = ListColumnsName.GetKey(cellIndex).ToString();
HSSFCell newCell = null;
System.Type rowType = drSource[columnsName].GetType();
string drValue = drSource[columnsName].ToString().Trim();
switch (rowType.ToString())
{
case "System.String"://字符串类型
drValue = drValue.Replace("&", "&");
drValue = drValue.Replace(">", ">");
drValue = drValue.Replace("<", "<");
newCell = currentExcelRow.CreateCell(cellIndex);
newCell.SetCellValue(drValue);
break;
case "System.DateTime"://日期类型
DateTime dateV;
DateTime.TryParse(drValue, out dateV);
newCell = currentExcelRow.CreateCell(cellIndex);
newCell.SetCellValue(dateV);
//格式化显示
HSSFCellStyle cellStyle = excelWorkBook.CreateCellStyle();
HSSFDataFormat format = excelWorkBook.CreateDataFormat();
cellStyle.DataFormat = format.GetFormat("yyyy-mm-dd hh:mm:ss");
newCell.CellStyle = cellStyle;
break;
case "System.Boolean"://布尔型
bool boolV = false;
bool.TryParse(drValue, out boolV);
newCell = currentExcelRow.CreateCell(cellIndex);
newCell.SetCellValue(boolV);
break;
case "System.Int16"://整型
case "System.Int32":
case "System.Int64":
case "System.Byte":
int intV = 0;
int.TryParse(drValue, out intV);
newCell = currentExcelRow.CreateCell(cellIndex);
newCell.SetCellValue(intV.ToString());
break;
case "System.Decimal"://浮点型
case "System.Double":
double doubV = 0;
double.TryParse(drValue, out doubV);
newCell = currentExcelRow.CreateCell(cellIndex);
newCell.SetCellValue(doubV);
break;
case "System.DBNull"://空值处理
newCell = currentExcelRow.CreateCell(cellIndex);
newCell.SetCellValue("");
break;
default:
throw (new Exception(rowType.ToString() + "：类型数据无法处理!"));
}
}
}
}
//排序实现接口 不进行排序 根据添加顺序导出
public class NoSort : System.Collections.IComparer
{
public int Compare(object x, object y)
{
return -1;
}
}
}
调用方法：
代码
//导出数据列 实现根据添加顺序导出列
StarTech.NPOI.NPOIHelper.ListColumnsName = new SortedList(new StarTech.NPOI.NoSort());
StarTech.NPOI.NPOIHelper.ListColumnsName.Add("MemberName", "姓名");
StarTech.NPOI.NPOIHelper.ListColumnsName.Add("username", "账号");
StarTech.NPOI.NPOIHelper.ListColumnsName.Add("starttime", "登陆时间");
StarTech.NPOI.NPOIHelper.ListColumnsName.Add("lasttime", "在线到期时间");
StarTech.NPOI.NPOIHelper.ListColumnsName.Add("state", "状态");
Response.Clear();
Response.BufferOutput = false;
Response.ContentEncoding = System.Text.Encoding.UTF8;
string filename = HttpUtility.UrlEncode(DateTime.Now.ToString("在线用户yyyyMMdd"));
Response.AddHeader("Content-Disposition", "attachment;filename=" + filename + ".xls");
Response.ContentType = "application/ms-excel";
StarTech.NPOI.NPOIHelper.ExportExcel(dtSource, Response.OutputStream);
Response.Close();
