//NPOIHelper 類關鍵代碼
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.IO;
using NPOI.HSSF.UserModel;
using System.Collections;
using System.Web;
namespace Yikeba_htmlConverter
{
public class NPOIHelper
{
/// <summary>
/// 列名集合
/// </summary>
public static System.Collections.SortedList ListColumnsName;
/// <summary>
/// 導出Excel通過文件路徑
/// </summary>
/// <param name="dtSource">DataTable數據源</param>
/// <param name="filePath">文件路徑</param>
public static void ExportExcel(DataTable dtSource, string filePath)
{
if (ListColumnsName == null || ListColumnsName.Count == 0)
throw (new Exception("請對ListColumnsName設置要導出的列名！"));
HSSFWorkbook excelWorkbook = CreateExcelFile();
InsertRow(dtSource, excelWorkbook);
SaveExcelFile(excelWorkbook, filePath);
}
/// <summary>
/// 導出Excel通過流
/// </summary>
/// <param name="dtSource">DataTable數據源</param>
/// <param name="excelStream">流操作</param>
public static void ExportExcel(DataTable dtSource, Stream excelStream)
{
if (ListColumnsName == null || ListColumnsName.Count == 0)
throw (new Exception("請對ListColumnsName設置要導出的列明！"));
HSSFWorkbook excelWorkbook = CreateExcelFile(); //新建一個工作區域
InsertRow(dtSource, excelWorkbook);//導入數據的方法
SaveExcelFile(excelWorkbook, excelStream);//保存excel
}
/// <summary>
/// 保存Excel文件通過路徑
/// </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>
/// 創建Excel文件
/// </summary>
/// <param name="filePath"></param>
protected static HSSFWorkbook CreateExcelFile()
{
HSSFWorkbook hssfworkbook = new HSSFWorkbook();
return hssfworkbook;
}
/// <summary>
/// 創建excel表頭
/// </summary>
/// <param name="dgv"></param>
/// <param name="excelSheet"></param>
protected static void CreateHeader(HSSFSheet excelSheet)
{
int cellIndex = 0;
//循環導出列
foreach (System.Collections.DictionaryEntry de in ListColumnsName)
{
HSSFRow newRow = excelSheet.CreateRow(0);
HSSFCell newCell = newRow.CreateCell(cellIndex);
newCell.SetCellValue(de.Value.ToString());
cellIndex++;
}
}
/// <summary>
/// 插入數據行
/// </summary>
protected static void InsertRow(DataTable dtSource, HSSFWorkbook excelWorkbook)
{
int rowCount = 0;
int sheetCount = 1;
HSSFSheet newsheet = null;
//循環數據源導出數據集
newsheet = excelWorkbook.CreateSheet("Sheet" + sheetCount); //創建第一個sheet
CreateHeader(newsheet);//加載sheet的頭信息
foreach (DataRow dr in dtSource.Rows) //循環DataTable里面的數據行
{
rowCount++;
//超出10000條數據 創建新的工作簿
if (rowCount == 10000) //超過10000行數據就新建一個sheet
{
rowCount = 1;
sheetCount++;
newsheet = excelWorkbook.CreateSheet("Sheet" + sheetCount); //新建sheet
CreateHeader(newsheet);//新建sheet的頭信息
}
HSSFRow newRow = newsheet.CreateRow(rowCount);//創建sheet的當前行
InsertCell(dtSource, dr, newRow, newsheet, excelWorkbook); //往當前行里面的每一列循環添加數據
}
}
/// <summary>
/// 導出數據行
/// </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++)
{
//列名稱
string columnsName = ListColumnsName.GetKey(cellIndex).ToString();
HSSFCell newCell = null;
System.Type rowType = drSource[cellIndex].GetType();
string drValue = drSource[cellIndex].ToString().Trim();
switch (rowType.ToString())
{
case "System.String"://字符串類型
drValue = drValue.Replace("&", "&");
drValue = drValue.Replace(">", ">");
drValue = drValue.Replace("<", "<");
newCell = currentExcelRow.CreateCell(cellIndex);
newCell.SetCellValue(drValue);
break;
case "System.DateTime"://日期類型
DateTime dateV;
DateTime.TryParse(drValue, out dateV);
newCell = currentExcelRow.CreateCell(cellIndex);
newCell.SetCellValue(dateV);
//格式化顯示
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"://布爾型
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"://浮點型
case "System.Double":
double doubV = 0;
double.TryParse(drValue, out doubV);
newCell = currentExcelRow.CreateCell(cellIndex);
newCell.SetCellValue(doubV);
break;
case "System.DBNull"://空值處理
newCell = currentExcelRow.CreateCell(cellIndex);
newCell.SetCellValue("");
break;
default:
throw (new Exception(rowType.ToString() + "：類型數據無法處理!"));
}
}
}
}
//排序實現接口 不進行排序 根據添加順序導出
public class NoSort : System.Collections.IComparer
{
public int Compare(object x, object y)
{
return -1;
}
}
}
//新建一個WebForm1頁面測試
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
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.Xml.Linq;
using Yikeba_htmlConverter;
using System.Xml;
using System.IO;
namespace WebApplication1
{
public partial class WebForm1 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
//導出數據列 實現根據添加順序導出列
NPOIHelper.ListColumnsName = new SortedList(new NoSort());
NPOIHelper.ListColumnsName.Add("MemberName", "姓名");
NPOIHelper.ListColumnsName.Add("username", "賬號");
NPOIHelper.ListColumnsName.Add("starttime", "登陸時間");
NPOIHelper.ListColumnsName.Add("lasttime", "在線到期時間");
NPOIHelper.ListColumnsName.Add("state", "狀態");
Response.Clear();
Response.BufferOutput = false;
Response.ContentEncoding = System.Text.Encoding.UTF8;
string filename = HttpUtility.UrlEncode(DateTime.Now.ToString("在線用戶yyyyMMdd"));
Response.AddHeader("Content-Disposition", "attachment;filename=DownExcel" + ".xls");
Response.ContentType = "application/ms-excel";
string str = "<table><tr><td>CSBT-120906-TG6</td><td>廖建軍</td><td>LIAO</td><td>JIANJUN</td><td>男</td></tr><tr><td>CSBT-120906-TG7</td><td>王漢剛</td><td>WANG</td><td>HANGANG</td><td>男</td></tr></table>";
str = "<?xml version=\"1.0\" standalone=\"yes\"?>" + str;
//清洗
XmlDocument doc = new XmlDocument();
doc.LoadXml(str);
XmlNodeList nodes = doc.SelectNodes("table/tr");
foreach (XmlElement node in nodes)
{
node.Attributes.RemoveAll(); //這里把Tr所有的屬性都去掉
for (int i = 0; i < node.ChildNodes.Count; i++) //列的循環,為每個列指定名稱
{
XmlNode n = doc.CreateNode(XmlNodeType.Element, "col" + i.ToString(), "");
n.InnerXml = node.ChildNodes[i].InnerXml;
node.ReplaceChild(n, node.ChildNodes[i]);
}
}
//導入Dataset
StringReader tr = new StringReader(doc.InnerXml);
DataSet ds = new DataSet();
ds.ReadXml(tr);
DataTable dtSource = ds.Tables[0];
// DataTable dtSource = new DataTable();
NPOIHelper.ExportExcel(dtSource, Response.OutputStream);
Response.Close();
}
}
}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//輔助
http://www.cnblogs.com/atao/archive/2009/09/24/1572980.html 生成下拉列表
http://www.cnblogs.com/tonyqus/category/182110.html 更多更詳細的execl用法
http://www.cnblogs.com/atao/archive/2009/09/13/1565644.html 處理日期函數
http://www.cnblogs.com/tonyqus/archive/2009/04/12/1434209.html NPOI使用Excel公式、 單元格操作、創建圖形等高級功能