NPOI导出Excel表功能实现(多个工作簿)(备用）

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 == )
                 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 == )
                 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 = ;
             //循环导出列
             foreach (System.Collections.DictionaryEntry de in ListColumnsName)
             {
                 HSSFRow newRow = excelSheet.CreateRow();
                 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 = ;
             int sheetCount = ;
             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 == )
                 {
                     rowCount = ;
                     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 = ; 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 = ;
                         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 = ;
                         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 -;
         }
     }
 }

Excel生成类

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();

调用Helper