nopi导出

1、NPOI官方网站：http://npoi.codeplex.com/

   可以到此网站上去下载最新的NPOI组件版本

2、NPOI在线学习教程（中文版）：

    http://www.cnblogs.com/tonyqus/archive/2009/04/12/1434209.html

   感谢Tony Qu分享出NPOI组件的使用方法

3、.NET调用NPOI组件导入导出Excel的操作类
　　此NPOI操作类的优点如下：
   （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；

NPOI操作类 

Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->  1 using System;
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 System.Text;
using NPOI;
using NPOI.HPSF;
using NPOI.HSSF;
using NPOI.HSSF.UserModel;
using NPOI.HSSF.Util;
using NPOI.POIFS;
using NPOI.Util;  
namespace PMS.Common
{
    public class NPOIHelper
    {
        /// <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 strHeaderText, string strFileName)
        {
            using (MemoryStream ms = Export(dtSource, strHeaderText))
            {
                using (FileStream fs = new FileStream(strFileName, FileMode.Create, FileAccess.Write))
                {
                    byte[] data = ms.ToArray();
                    fs.Write(data, 0, data.Length);
                    fs.Flush();
                }
            }
        }

        /// <summary>
        /// DataTable导出到Excel的MemoryStream
        /// </summary>
        /// <param name="dtSource">源DataTable</param>
        /// <param name="strHeaderText">表头文本</param>
        public static MemoryStream Export(DataTable dtSource, string strHeaderText)
        {
            HSSFWorkbook workbook = new HSSFWorkbook();
            HSSFSheet sheet = workbook.CreateSheet();

            #region 右击文件 属性信息
            {
                DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation();
                dsi.Company = "NPOI";
                workbook.DocumentSummaryInformation = dsi;

                SummaryInformation si = PropertySetFactory.CreateSummaryInformation();
                si.Author = "文件作者信息"; //填加xls文件作者信息
                si.ApplicationName = "创建程序信息"; //填加xls文件创建程序信息
                si.LastAuthor = "最后保存者信息"; //填加xls文件最后保存者信息
                si.Comments = "作者信息"; //填加xls文件作者信息
                si.Title = "标题信息"; //填加xls文件标题信息
                si.Subject = "主题信息";//填加文件主题信息
                si.CreateDateTime = DateTime.Now;
                workbook.SummaryInformation = si;
            }
            #endregion

            HSSFCellStyle dateStyle = workbook.CreateCellStyle();
            HSSFDataFormat format = workbook.CreateDataFormat();
            dateStyle.DataFormat = format.GetFormat("yyyy-mm-dd");

            //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 i = 0; i < dtSource.Rows.Count; i++)
            {
                for (int j = 0; j < dtSource.Columns.Count; j++)
                {
                    int intTemp = Encoding.GetEncoding(936).GetBytes(dtSource.Rows[i][j].ToString()).Length;
                    if (intTemp > arrColWidth[j])
                    {
                        arrColWidth[j] = 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;
                        HSSFFont font = workbook.CreateFont();
                        font.FontHeightInPoints = 10;
                        font.Boldweight = 700;
                        headStyle.SetFont(font); 
                        foreach (DataColumn column in dtSource.Columns)
                        {
                            headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
                            headerRow.GetCell(column.Ordinal).CellStyle = headStyle;

                            //设置列宽
                            sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal] + 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);

                    string drValue = row[column].ToString();

                    switch (column.DataType.ToString())
                    {
                        case "System.String"://字符串类型
                            newCell.SetCellValue(drValue);
                            break;
                        case "System.DateTime"://日期类型
                            DateTime dateV;
                            DateTime.TryParse(drValue, out dateV);
                            newCell.SetCellValue(dateV);

                            newCell.CellStyle = dateStyle;//格式化显示
                            break;
                        case "System.Boolean"://布尔型
                            bool boolV = false;
                            bool.TryParse(drValue, out boolV);
                            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.SetCellValue(intV);
                            break;
                        case "System.Decimal"://浮点型
                        case "System.Double":
                            double doubV = 0;
                            double.TryParse(drValue, out doubV);
                            newCell.SetCellValue(doubV);
                            break;
                        case "System.DBNull"://空值处理
                            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();//一般只用写这一个就OK了，他会遍历并释放所有资源，但当前版本有问题所以只释放sheet
                return ms;
            } 
        }

        /// <summary>
        /// 用于Web导出
        /// </summary>
        /// <param name="dtSource">源DataTable</param>
        /// <param name="strHeaderText">表头文本</param>
        /// <param name="strFileName">文件名</param>
        public static void ExportByWeb(DataTable dtSource, 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, strHeaderText).GetBuffer());
            curContext.Response.End(); 
        } 

        /// <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;
        }
    }
}

参考1

public void Export()
        {
            string filename = Request["searchString"];

            Response.Clear();
            Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
            Response.AddHeader("Content-Disposition", string.Format("attachment;filename={0}", filename+ ".xlsx"));

            NPOI.XSSF.UserModel.XSSFWorkbook workbook = new NPOI.XSSF.UserModel.XSSFWorkbook();
            NPOI.SS.UserModel.ISheet sheet1 = workbook.CreateSheet("BOM详情");

            //给sheet1添加第一行的头部标题
            NPOI.SS.UserModel.IRow row1 = sheet1.CreateRow(0);
            row1.CreateCell(0).SetCellValue("物料编码");
            row1.CreateCell(1).SetCellValue("物料名称");
            row1.CreateCell(2).SetCellValue("规格型号");
            row1.CreateCell(3).SetCellValue("物料用量");
            row1.CreateCell(4).SetCellValue("用量单位");
            row1.CreateCell(5).SetCellValue("备注");
            //将数据逐步写入sheet1各个行
            List<AkBom> pageResult = _akBomRepository.GetPageList(0, 10000, Request["searchString"], "");
            for (int i = 0; i < pageResult.Count; i++)
            {
                NPOI.SS.UserModel.IRow rowtemp = sheet1.CreateRow(i + 1);
                rowtemp.CreateCell(0).SetCellValue(pageResult[i].ChildNumber);
                rowtemp.CreateCell(1).SetCellValue(pageResult[i].ChildName);
                rowtemp.CreateCell(2).SetCellValue(pageResult[i].Spec);
                rowtemp.CreateCell(3).SetCellValue(double.Parse(pageResult[i].MaterialSum.ToString()));
                rowtemp.CreateCell(4).SetCellValue(pageResult[i].Unit);
                rowtemp.CreateCell(5).SetCellValue(pageResult[i].Remark);
            }
            //写入到客户端 
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            workbook.Write(ms);
            Response.BinaryWrite(ms.ToArray());

            Response.Flush();
            Response.End();
        }

参考3

public void Export()
        {
            string searchString = Request["searchString"];
            string line = Request["line"];
            string station = Request["station"];
            string begin = Request["begin"];
            string end = Request["end"];

            Response.Clear();
            Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
            Response.AddHeader("Content-Disposition", string.Format("attachment;filename={0}", "FQC.xlsx"));

            NPOI.XSSF.UserModel.XSSFWorkbook workbook = new NPOI.XSSF.UserModel.XSSFWorkbook();
            NPOI.SS.UserModel.ISheet sheet1 = workbook.CreateSheet("FQC");

            //excel格式化
            NPOI.SS.UserModel.ICellStyle dateStyle = workbook.CreateCellStyle();
            dateStyle.DataFormat = workbook.CreateDataFormat().GetFormat("yyyy/m/d h:mm:ss");

            NPOI.SS.UserModel.ICellStyle numberStyle = workbook.CreateCellStyle();
            numberStyle.DataFormat = workbook.CreateDataFormat().GetFormat("0.00000");

            NPOI.SS.UserModel.ICellStyle textStyle = workbook.CreateCellStyle();
            textStyle.DataFormat = workbook.CreateDataFormat().GetFormat("@");

            //给sheet1添加第一行的头部标题
            NPOI.SS.UserModel.IRow row1 = sheet1.CreateRow(0);
            row1.CreateCell(0).SetCellValue("订单号");
            row1.CreateCell(1).SetCellValue("条码");
            row1.CreateCell(2).SetCellValue("档位名称");
            row1.CreateCell(3).SetCellValue("Pmax");
            row1.CreateCell(4).SetCellValue("功率档");
            row1.CreateCell(5).SetCellValue("功率档范围");
            row1.CreateCell(6).SetCellValue("Ipm");
            row1.CreateCell(7).SetCellValue("电流档");
            row1.CreateCell(8).SetCellValue("电流档范围");
            row1.CreateCell(9).SetCellValue("规格");
            row1.CreateCell(10).SetCellValue("产品等级");
            row1.CreateCell(11).SetCellValue("电池片等级");
            row1.CreateCell(12).SetCellValue("FQC不良");
            row1.CreateCell(13).SetCellValue("判定结果");
            row1.CreateCell(14).SetCellValue("人员");
            row1.CreateCell(15).SetCellValue("线别");
            row1.CreateCell(16).SetCellValue("工位");
            row1.CreateCell(17).SetCellValue("备注");
            row1.CreateCell(18).SetCellValue("扫描时间");
            row1.CreateCell(19).SetCellValue("输入时间");
            row1.CreateCell(20).SetCellValue("Eff");
            row1.CreateCell(21).SetCellValue("Isc");
            row1.CreateCell(22).SetCellValue("Voc");
            row1.CreateCell(23).SetCellValue("Rs");
            row1.CreateCell(24).SetCellValue("Rsh");
            row1.CreateCell(25).SetCellValue("Vpm");
            row1.CreateCell(26).SetCellValue("FF");
            row1.CreateCell(27).SetCellValue("Sun");
            row1.CreateCell(28).SetCellValue("Temp");
            row1.CreateCell(29).SetCellValue("Class");
            //将数据逐步写入sheet1各个行
            string strSql = "where AkFqc.BarCode like '%@param%' and (AkFqc.DateTime between '@begin' and '@end') and AkFqc.LineTitle like '%@line%' and AkFqc.StationTitle like '%@station%'";
            strSql = strSql.Replace("@param", searchString);
            strSql = strSql.Replace("@begin", begin);
            strSql = strSql.Replace("@end", end);
            strSql = strSql.Replace("@line", line);
            strSql = strSql.Replace("@station", station);

            List<AkFqc> pageResult = _akFqcRepository.GetPageList(0, 100000, strSql, "order by AkFqc.Id desc");
            for (int i = 0; i < pageResult.Count; i++)
            {
                NPOI.SS.UserModel.IRow rowtemp = sheet1.CreateRow(i + 1);

                rowtemp.CreateCell(0).SetCellValue(pageResult[i].OrderNumber);
                rowtemp.CreateCell(1).SetCellValue(pageResult[i].BarCode);
                rowtemp.CreateCell(2).SetCellValue(pageResult[i].Title);
                rowtemp.CreateCell(3).SetCellValue(Convert.ToDouble(string.Format("{0:0.00000}", pageResult[i].Pmax)));
                rowtemp.CreateCell(4).SetCellValue(pageResult[i].PTitle);
                rowtemp.CreateCell(5).SetCellValue(pageResult[i].PScope);
                rowtemp.CreateCell(6).SetCellValue(Convert.ToDouble(string.Format("{0:0.00000}", pageResult[i].Ipm)));
                rowtemp.CreateCell(7).SetCellValue(pageResult[i].ITitle);
                rowtemp.CreateCell(8).SetCellValue(pageResult[i].IScope);
                rowtemp.CreateCell(9).SetCellValue(pageResult[i].Spec);
                rowtemp.CreateCell(10).SetCellValue(pageResult[i].ProductLevel);
                rowtemp.CreateCell(11).SetCellValue(pageResult[i].BatteryLevel);
                rowtemp.CreateCell(12).SetCellValue(pageResult[i].BadReason);
                rowtemp.CreateCell(13).SetCellValue(pageResult[i].JudgeResult);
                rowtemp.CreateCell(14).SetCellValue(pageResult[i].Employee);
                rowtemp.CreateCell(15).SetCellValue(pageResult[i].LineTitle);
                rowtemp.CreateCell(16).SetCellValue(pageResult[i].StationTitle);
                rowtemp.CreateCell(17).SetCellValue(pageResult[i].Remark);
                rowtemp.CreateCell(18).SetCellValue(pageResult[i].DateTime);
                rowtemp.CreateCell(19).SetCellValue(pageResult[i].ScanDate);
                rowtemp.CreateCell(20).SetCellValue(Convert.ToDouble(string.Format("{0:0.00000}", pageResult[i].Eff)));
                rowtemp.CreateCell(21).SetCellValue(Convert.ToDouble(string.Format("{0:0.00000}", pageResult[i].Isc)));
                rowtemp.CreateCell(22).SetCellValue(Convert.ToDouble(string.Format("{0:0.00000}", pageResult[i].Voc)));
                rowtemp.CreateCell(23).SetCellValue(Convert.ToDouble(string.Format("{0:0.00000}", pageResult[i].Rs)));
                rowtemp.CreateCell(24).SetCellValue(Convert.ToDouble(string.Format("{0:0.00000}", pageResult[i].Rsh)));
                rowtemp.CreateCell(25).SetCellValue(Convert.ToDouble(string.Format("{0:0.00000}", pageResult[i].Vpm)));
                rowtemp.CreateCell(26).SetCellValue(Convert.ToDouble(string.Format("{0:0.00000}", pageResult[i].FF)));
                rowtemp.CreateCell(27).SetCellValue(Convert.ToDouble(string.Format("{0:0.00000}", pageResult[i].Sun)));
                rowtemp.CreateCell(28).SetCellValue(Convert.ToDouble(string.Format("{0:0.00000}", pageResult[i].Temp)));
                rowtemp.CreateCell(29).SetCellValue(pageResult[i].Class);

                rowtemp.GetCell(0).CellStyle = textStyle;
                rowtemp.GetCell(1).CellStyle = textStyle;
                rowtemp.GetCell(2).CellStyle = textStyle;
                rowtemp.GetCell(3).CellStyle = numberStyle;
                rowtemp.GetCell(4).CellStyle = textStyle;
                rowtemp.GetCell(5).CellStyle = textStyle;
                rowtemp.GetCell(6).CellStyle = numberStyle;
                rowtemp.GetCell(7).CellStyle = textStyle;
                rowtemp.GetCell(8).CellStyle = textStyle;
                rowtemp.GetCell(9).CellStyle = textStyle;
                rowtemp.GetCell(10).CellStyle = textStyle;
                rowtemp.GetCell(11).CellStyle = textStyle;
                rowtemp.GetCell(12).CellStyle = textStyle;
                rowtemp.GetCell(13).CellStyle = textStyle;
                rowtemp.GetCell(14).CellStyle = textStyle;
                rowtemp.GetCell(15).CellStyle = textStyle;
                rowtemp.GetCell(16).CellStyle = textStyle;
                rowtemp.GetCell(17).CellStyle = textStyle;
                rowtemp.GetCell(18).CellStyle = dateStyle;
                rowtemp.GetCell(19).CellStyle = dateStyle;
                rowtemp.GetCell(20).CellStyle = numberStyle;
                rowtemp.GetCell(21).CellStyle = numberStyle;
                rowtemp.GetCell(22).CellStyle = numberStyle;
                rowtemp.GetCell(23).CellStyle = numberStyle;
                rowtemp.GetCell(24).CellStyle = numberStyle;
                rowtemp.GetCell(25).CellStyle = numberStyle;
                rowtemp.GetCell(26).CellStyle = numberStyle;
                rowtemp.GetCell(27).CellStyle = numberStyle;
                rowtemp.GetCell(28).CellStyle = numberStyle;
                rowtemp.GetCell(29).CellStyle = textStyle;
            }
            //写入到客户端 
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            workbook.Write(ms);
            Response.BinaryWrite(ms.ToArray());

            Response.Flush();
            Response.End();
        }

NPOI操作类

Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->  1 using System;
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 System.Text;
using NPOI;
using NPOI.HPSF;
using NPOI.HSSF;
using NPOI.HSSF.UserModel;
using NPOI.HSSF.Util;
using NPOI.POIFS;
using NPOI.Util;  
namespace PMS.Common
{
    public class NPOIHelper
    {
        /// <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 strHeaderText, string strFileName)
        {
            using (MemoryStream ms = Export(dtSource, strHeaderText))
            {
                using (FileStream fs = new FileStream(strFileName, FileMode.Create, FileAccess.Write))
                {
                    byte[] data = ms.ToArray();
                    fs.Write(data, 0, data.Length);
                    fs.Flush();
                }
            }
        }

        /// <summary>
        /// DataTable导出到Excel的MemoryStream
        /// </summary>
        /// <param name="dtSource">源DataTable</param>
        /// <param name="strHeaderText">表头文本</param>
        public static MemoryStream Export(DataTable dtSource, string strHeaderText)
        {
            HSSFWorkbook workbook = new HSSFWorkbook();
            HSSFSheet sheet = workbook.CreateSheet();

            #region 右击文件 属性信息
            {
                DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation();
                dsi.Company = "NPOI";
                workbook.DocumentSummaryInformation = dsi;

                SummaryInformation si = PropertySetFactory.CreateSummaryInformation();
                si.Author = "文件作者信息"; //填加xls文件作者信息
                si.ApplicationName = "创建程序信息"; //填加xls文件创建程序信息
                si.LastAuthor = "最后保存者信息"; //填加xls文件最后保存者信息
                si.Comments = "作者信息"; //填加xls文件作者信息
                si.Title = "标题信息"; //填加xls文件标题信息
                si.Subject = "主题信息";//填加文件主题信息
                si.CreateDateTime = DateTime.Now;
                workbook.SummaryInformation = si;
            }
            #endregion

            HSSFCellStyle dateStyle = workbook.CreateCellStyle();
            HSSFDataFormat format = workbook.CreateDataFormat();
            dateStyle.DataFormat = format.GetFormat("yyyy-mm-dd");

            //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 i = 0; i < dtSource.Rows.Count; i++)
            {
                for (int j = 0; j < dtSource.Columns.Count; j++)
                {
                    int intTemp = Encoding.GetEncoding(936).GetBytes(dtSource.Rows[i][j].ToString()).Length;
                    if (intTemp > arrColWidth[j])
                    {
                        arrColWidth[j] = 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;
                        HSSFFont font = workbook.CreateFont();
                        font.FontHeightInPoints = 10;
                        font.Boldweight = 700;
                        headStyle.SetFont(font);
                        foreach (DataColumn column in dtSource.Columns)
                        {
                            headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
                            headerRow.GetCell(column.Ordinal).CellStyle = headStyle;

                            //设置列宽
                            sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal] + 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);

                    string drValue = row[column].ToString();

                    switch (column.DataType.ToString())
                    {
                        case "System.String"://字符串类型
                            newCell.SetCellValue(drValue);
                            break;
                        case "System.DateTime"://日期类型
                            DateTime dateV;
                            DateTime.TryParse(drValue, out dateV);
                            newCell.SetCellValue(dateV);

                            newCell.CellStyle = dateStyle;//格式化显示
                            break;
                        case "System.Boolean"://布尔型
                            bool boolV = false;
                            bool.TryParse(drValue, out boolV);
                            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.SetCellValue(intV);
                            break;
                        case "System.Decimal"://浮点型
                        case "System.Double":
                            double doubV = 0;
                            double.TryParse(drValue, out doubV);
                            newCell.SetCellValue(doubV);
                            break;
                        case "System.DBNull"://空值处理
                            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();//一般只用写这一个就OK了，他会遍历并释放所有资源，但当前版本有问题所以只释放sheet
                return ms;
            }
        }

        /// <summary>
        /// 用于Web导出
        /// </summary>
        /// <param name="dtSource">源DataTable</param>
        /// <param name="strHeaderText">表头文本</param>
        /// <param name="strFileName">文件名</param>
        public static void ExportByWeb(DataTable dtSource, 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, strHeaderText).GetBuffer());
            curContext.Response.End();
        }

        /// <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;
        }
    }
}