npoi导出excel
最近发现有很多人对excel的导入导出需求很大。根据一些网上的资料加上个人的整理把项目中的DATABLE导出到excel实现具体代码如下：
第一步首先说下功能中的优点和实现的部分：
功能说明:
(1) 支持web及winform从DataTable导出到Excel。
(2) 生成速度很快。
(3) 准确判断数据类型，不会出现身份证转数值等上面提到的一系列问题。
(4) 如果单页条数大于65535时会新建工作表。
(5) 列宽自适应
第二步怎么在程序中调用：
// 列的名称
String[] headerTitle = { "列名1", "列名", "列名3", "列名4", "列名5", "列名6", "列名7", "列名8", "列名9" };
// 标题
String titleName = "测试名称";
String fileName = "文件名称";//文件名称
DataTable _Datable = null;//数据集
NPOIHelper.ExportExcelByWeb(_Datable, headerTitle , titleName, fileName + ".xls");
第三步：具体实现代码：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.IO;
using NPOI;
using NPOI.HPSF;
using NPOI.HSSF;
using NPOI.HSSF.UserModel;
using NPOI.HSSF.Util;
using NPOI.POIFS;
using NPOI.Util;
namespace XuanRui.Common
{
/// <summary>
/// 功能说明:
/// (1) 支持web及winform从DataTable导出到Excel。
/// (2) 生成速度很快。
/// (3) 准确判断数据类型，不会出现身份证转数值等上面提到的一系列问题。
/// (4) 如果单页条数大于65535时会新建工作表。
/// (5) 列宽自适应
/// </summary>
public class NPOIHelper
{
#region DataTable导出到Excel文件
/// <summary>
/// DataTable导出到Excel文件
/// </summary>
/// <param name="dtSource">源DataTable</param>
/// <param name="strHeaderText">表头文本</param>
/// <param name="strFileName">保存位置</param>
public static void Export(DataTable dtSource, String[] headersTitle, string strHeaderText, string strFileName)
{
using (MemoryStream ms = Export(dtSource,headersTitle, strHeaderText))
{
using (FileStream fs = new FileStream(strFileName, FileMode.Create, FileAccess.Write))
{
byte[] data = ms.ToArray();
fs.Write(data, 0, data.Length);
fs.Flush();
}
}
}
#endregion
#region DataTable导出到Excel的MemoryStream
/// <summary>
/// DataTable导出到Excel的MemoryStream
/// </summary>
/// <param name="dtSource">源DataTable</param>
/// <param name="headersTitle">列头名称</param>
/// <param name="strHeaderText">表头文本</param>
public static MemoryStream Export(DataTable dtSource, String[] headersTitle, string strHeaderText)
{
HSSFWorkbook workbook = new HSSFWorkbook();
HSSFSheet sheet = workbook.CreateSheet();
#region 右击文件属性相关信息
{
DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation();
dsi.Company = "公司名称“
workbook.DocumentSummaryInformation = dsi;
SummaryInformation si = PropertySetFactory.CreateSummaryInformation();
si.Author = "zhaolf";
si.ApplicationName = "创建程序信息";
si.LastAuthor = "zhaolf";
si.Comments = "软件部";
si.Title = "报表导出";
si.Subject = "报表导出";
si.CreateDateTime = DateTime.Now;
workbook.SummaryInformation = si;
}
#endregion
HSSFCellStyle dateStyle = workbook.CreateCellStyle();
HSSFDataFormat format = workbook.CreateDataFormat();
dateStyle.DataFormat = format.GetFormat("yyyy-mm-dd");
dateStyle.Alignment = CellHorizontalAlignment.CENTER;
dateStyle.BorderBottom = CellBorderType.THIN;
dateStyle.BorderTop = CellBorderType.THIN;
dateStyle.BorderLeft = CellBorderType.THIN;
dateStyle.BorderRight = CellBorderType.THIN;
//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 index = 0; index < dtSource.Rows.Count; index++)
{
for (int icount = 0; icount < dtSource.Columns.Count; icount++)
{
int intTemp = Encoding.GetEncoding(936).GetBytes(dtSource.Rows[index][icount].ToString()).Length;
if (intTemp > arrColWidth[icount])
{
arrColWidth[icount] = 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(1);
HSSFCellStyle headStyle = workbook.CreateCellStyle();
headStyle.Alignment = CellHorizontalAlignment.CENTER;
// 填充列的背景色
headStyle.FillForegroundColor = HSSFColor.GREY_50_PERCENT.index;
headStyle.FillPattern = CellFillPattern.SOLID_FOREGROUND;
headStyle.BorderBottom = CellBorderType.THIN;
headStyle.BorderTop = CellBorderType.THIN;
headStyle.BorderLeft = CellBorderType.THIN;
headStyle.BorderRight= CellBorderType.THIN;
HSSFFont font = workbook.CreateFont();
font.FontHeightInPoints = 10;
font.Boldweight = 700;
headStyle.SetFont(font);
for (int index = 0; index < headersTitle.Count(); index++)
{
headerRow.CreateCell(index).SetCellValue(headersTitle[index]);
headerRow.GetCell(index).CellStyle = headStyle;
sheet.SetColumnWidth(index, (arrColWidth[index] + 1) * 256);
}
headerRow.Dispose();
}
#endregion
rowIndex = 2;
}
#endregion
#region 填充内容
HSSFRow dataRow = sheet.CreateRow(rowIndex);
foreach (DataColumn column in dtSource.Columns)
{
HSSFCell newCell = dataRow.CreateCell(column.Ordinal);
HSSFCellStyle headStyle = workbook.CreateCellStyle();
headStyle.Alignment = CellHorizontalAlignment.CENTER;
headStyle.BorderBottom = CellBorderType.THIN;
headStyle.BorderTop = CellBorderType.THIN;
headStyle.BorderLeft = CellBorderType.THIN;
headStyle.BorderRight = CellBorderType.THIN;
// dataRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
dataRow.GetCell(column.Ordinal).CellStyle = headStyle;
string drValue = row[column].ToString();
switch (column.DataType.ToString())
{
case "System.String":
newCell.SetCellValue(drValue);
break;
case "System.DateTime":
DateTime dateV;
DateTime.TryParse(drValue, out dateV);
newCell.SetCellValue(dateV);
newCell.CellStyle = dateStyle;
break;
case "System.Boolean":
bool boolV = false;
bool.TryParse(drValue, out boolV);
newCell.SetCellValue(boolV);
break;
case "System.Int16":
case "System.Int32":
case "System.Int64":
case "System.Byte":
int intV = 0;
int.TryParse(drValue, out intV);
newCell.SetCellValue(intV);
break;
case "System.Decimal":
case "System.Double":
double doubV = 0;
double.TryParse(drValue, out doubV);
newCell.SetCellValue(doubV);
break;
case "System.DBNull":
newCell.SetCellValue("");
break;
default:
newCell.SetCellValue("");
break;
}
}
#endregion
rowIndex++;
}
using (MemoryStream ms = new MemoryStream())
{
workbook.Write(ms);
ms.Flush();
ms.Position = 0;
sheet.Dispose();
//workbook.Dispose();
return ms;
}
}
#region 用于Web导出到EXCEL
/// <summary>
/// 用于Web导出
/// </summary>
/// <param name="dtSource">源DataTable</param>
/// <param name="headersTitle">列标题信息集合</param>
/// <param name="strHeaderText">表头文本</param>
/// <param name="strFileName">文件名</param>
public static void ExportExcelByWeb(DataTable dtSource, String[] headersTitle, 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(Export(dtSource, headersTitle, strHeaderText).GetBuffer());
curContext.Response.End();
}
#endregion
#region 读取excel默认第一行为标头
/// <summary>
/// 读取excel默认第一行为标头
/// </summary>
/// <param name="strFileName">excel文档路径</param>
/// <returns></returns>
public static DataTable Import(string strFileName)
{
DataTable dt = new DataTable();
HSSFWorkbook hssfworkbook;
using (FileStream file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))
{
hssfworkbook = new HSSFWorkbook(file);
}
HSSFSheet sheet = hssfworkbook.GetSheetAt(0);
System.Collections.IEnumerator rows = sheet.GetRowEnumerator();
HSSFRow headerRow = sheet.GetRow(0);
int cellCount = headerRow.LastCellNum;
for (int j = 0; j < cellCount; j++)
{
HSSFCell cell = headerRow.GetCell(j);
dt.Columns.Add(cell.ToString());
}
for (int i = (sheet.FirstRowNum + 1); i <= sheet.LastRowNum; i++)
{
HSSFRow row = sheet.GetRow(i);
DataRow dataRow = dt.NewRow();
for (int j = row.FirstCellNum; j < cellCount; j++)
{
if (row.GetCell(j) != null)
dataRow[j] = row.GetCell(j).ToString();
}
dt.Rows.Add(dataRow);
}
return dt;
}
#endregion
}
}
以上经过本人测试无误希望对有所要求的人给与帮助，谢谢光临及转载。
