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, , 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().GetBytes(item.ColumnName.ToString()).Length;

            }

            for (int i = ; i < dtSource.Rows.Count; i++)

            {

                for (int j = ; j < dtSource.Columns.Count; j++)

                {

                    int intTemp = Encoding.GetEncoding().GetBytes(dtSource.Rows[i][j].ToString()).Length;

                    if (intTemp > arrColWidth[j])

                    {

                        arrColWidth[j] = intTemp;

                    }

                }

            }

            int rowIndex = ;

            foreach (DataRow row in dtSource.Rows)

            {

                #region 新建表，填充表头，填充列头，样式

                if (rowIndex ==  || rowIndex == )

                {

                    if (rowIndex != )

                    {

                        sheet = workbook.CreateSheet();

                    }

                    #region 表头及样式

                    {

                        HSSFRow headerRow = sheet.CreateRow();

                        headerRow.HeightInPoints = ;

                        headerRow.CreateCell().SetCellValue(strHeaderText);

                        HSSFCellStyle headStyle = workbook.CreateCellStyle();

                        headStyle.Alignment = CellHorizontalAlignment.CENTER;

                        HSSFFont font = workbook.CreateFont();

                        font.FontHeightInPoints = ;

                        font.Boldweight = ;

                        headStyle.SetFont(font);

                        headerRow.GetCell().CellStyle = headStyle;

                        sheet.AddMergedRegion(new Region(, , , dtSource.Columns.Count - ));

                        headerRow.Dispose();

                    }

                    #endregion

                    #region 列头及样式

                    {

                        HSSFRow headerRow = sheet.CreateRow();

                        HSSFCellStyle headStyle = workbook.CreateCellStyle();

                        headStyle.Alignment = CellHorizontalAlignment.CENTER;

                        HSSFFont font = workbook.CreateFont();

                        font.FontHeightInPoints = ;

                        font.Boldweight = ;

                        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] + ) * );

                        }

                        headerRow.Dispose();

                    }

                    #endregion

                    rowIndex = ;

                }

                #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 = ;

                            int.TryParse(drValue, out intV);

                            newCell.SetCellValue(intV);

                            break;

                        case "System.Decimal"://浮点型

                        case "System.Double":

                            double doubV = ;

                            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 = ;

                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();

            System.Collections.IEnumerator rows = sheet.GetRowEnumerator();

            HSSFRow headerRow = sheet.GetRow();

            int cellCount = headerRow.LastCellNum;

            for (int j = ; j < cellCount; j++)

            {

                HSSFCell cell = headerRow.GetCell(j);

                dt.Columns.Add(cell.ToString());

            }

            for (int i = (sheet.FirstRowNum + ); 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();

            row1.CreateCell().SetCellValue("物料编码");

            row1.CreateCell().SetCellValue("物料名称");

            row1.CreateCell().SetCellValue("规格型号");

            row1.CreateCell().SetCellValue("物料用量");

            row1.CreateCell().SetCellValue("用量单位");

            row1.CreateCell().SetCellValue("备注");

            //将数据逐步写入sheet1各个行

            List<AkBom> pageResult = _akBomRepository.GetPageList(, , Request["searchString"], "");

            for (int i = ; i < pageResult.Count; i++)

            {

                NPOI.SS.UserModel.IRow rowtemp = sheet1.CreateRow(i + );

                rowtemp.CreateCell().SetCellValue(pageResult[i].ChildNumber);

                rowtemp.CreateCell().SetCellValue(pageResult[i].ChildName);

                rowtemp.CreateCell().SetCellValue(pageResult[i].Spec);

                rowtemp.CreateCell().SetCellValue(double.Parse(pageResult[i].MaterialSum.ToString()));

                rowtemp.CreateCell().SetCellValue(pageResult[i].Unit);

                rowtemp.CreateCell().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();

            row1.CreateCell().SetCellValue("订单号");

            row1.CreateCell().SetCellValue("条码");

            row1.CreateCell().SetCellValue("档位名称");

            row1.CreateCell().SetCellValue("Pmax");

            row1.CreateCell().SetCellValue("功率档");

            row1.CreateCell().SetCellValue("功率档范围");

            row1.CreateCell().SetCellValue("Ipm");

            row1.CreateCell().SetCellValue("电流档");

            row1.CreateCell().SetCellValue("电流档范围");

            row1.CreateCell().SetCellValue("规格");

            row1.CreateCell().SetCellValue("产品等级");

            row1.CreateCell().SetCellValue("电池片等级");

            row1.CreateCell().SetCellValue("FQC不良");

            row1.CreateCell().SetCellValue("判定结果");

            row1.CreateCell().SetCellValue("人员");

            row1.CreateCell().SetCellValue("线别");

            row1.CreateCell().SetCellValue("工位");

            row1.CreateCell().SetCellValue("备注");

            row1.CreateCell().SetCellValue("扫描时间");

            row1.CreateCell().SetCellValue("输入时间");

            row1.CreateCell().SetCellValue("Eff");

            row1.CreateCell().SetCellValue("Isc");

            row1.CreateCell().SetCellValue("Voc");

            row1.CreateCell().SetCellValue("Rs");

            row1.CreateCell().SetCellValue("Rsh");

            row1.CreateCell().SetCellValue("Vpm");

            row1.CreateCell().SetCellValue("FF");

            row1.CreateCell().SetCellValue("Sun");

            row1.CreateCell().SetCellValue("Temp");

            row1.CreateCell().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(, , strSql, "order by AkFqc.Id desc");

            for (int i = ; i < pageResult.Count; i++)

            {

                NPOI.SS.UserModel.IRow rowtemp = sheet1.CreateRow(i + );

                rowtemp.CreateCell().SetCellValue(pageResult[i].OrderNumber);

                rowtemp.CreateCell().SetCellValue(pageResult[i].BarCode);

                rowtemp.CreateCell().SetCellValue(pageResult[i].Title);

                rowtemp.CreateCell().SetCellValue(Convert.ToDouble(string.Format("{0:0.00000}", pageResult[i].Pmax)));

                rowtemp.CreateCell().SetCellValue(pageResult[i].PTitle);

                rowtemp.CreateCell().SetCellValue(pageResult[i].PScope);

                rowtemp.CreateCell().SetCellValue(Convert.ToDouble(string.Format("{0:0.00000}", pageResult[i].Ipm)));

                rowtemp.CreateCell().SetCellValue(pageResult[i].ITitle);

                rowtemp.CreateCell().SetCellValue(pageResult[i].IScope);

                rowtemp.CreateCell().SetCellValue(pageResult[i].Spec);

                rowtemp.CreateCell().SetCellValue(pageResult[i].ProductLevel);

                rowtemp.CreateCell().SetCellValue(pageResult[i].BatteryLevel);

                rowtemp.CreateCell().SetCellValue(pageResult[i].BadReason);

                rowtemp.CreateCell().SetCellValue(pageResult[i].JudgeResult);

                rowtemp.CreateCell().SetCellValue(pageResult[i].Employee);

                rowtemp.CreateCell().SetCellValue(pageResult[i].LineTitle);

                rowtemp.CreateCell().SetCellValue(pageResult[i].StationTitle);

                rowtemp.CreateCell().SetCellValue(pageResult[i].Remark);

                rowtemp.CreateCell().SetCellValue(pageResult[i].DateTime);

                rowtemp.CreateCell().SetCellValue(pageResult[i].ScanDate);

                rowtemp.CreateCell().SetCellValue(Convert.ToDouble(string.Format("{0:0.00000}", pageResult[i].Eff)));

                rowtemp.CreateCell().SetCellValue(Convert.ToDouble(string.Format("{0:0.00000}", pageResult[i].Isc)));

                rowtemp.CreateCell().SetCellValue(Convert.ToDouble(string.Format("{0:0.00000}", pageResult[i].Voc)));

                rowtemp.CreateCell().SetCellValue(Convert.ToDouble(string.Format("{0:0.00000}", pageResult[i].Rs)));

                rowtemp.CreateCell().SetCellValue(Convert.ToDouble(string.Format("{0:0.00000}", pageResult[i].Rsh)));

                rowtemp.CreateCell().SetCellValue(Convert.ToDouble(string.Format("{0:0.00000}", pageResult[i].Vpm)));

                rowtemp.CreateCell().SetCellValue(Convert.ToDouble(string.Format("{0:0.00000}", pageResult[i].FF)));

                rowtemp.CreateCell().SetCellValue(Convert.ToDouble(string.Format("{0:0.00000}", pageResult[i].Sun)));

                rowtemp.CreateCell().SetCellValue(Convert.ToDouble(string.Format("{0:0.00000}", pageResult[i].Temp)));

                rowtemp.CreateCell().SetCellValue(pageResult[i].Class);

                rowtemp.GetCell().CellStyle = textStyle;

                rowtemp.GetCell().CellStyle = textStyle;

                rowtemp.GetCell().CellStyle = textStyle;

                rowtemp.GetCell().CellStyle = numberStyle;

                rowtemp.GetCell().CellStyle = textStyle;

                rowtemp.GetCell().CellStyle = textStyle;

                rowtemp.GetCell().CellStyle = numberStyle;

                rowtemp.GetCell().CellStyle = textStyle;

                rowtemp.GetCell().CellStyle = textStyle;

                rowtemp.GetCell().CellStyle = textStyle;

                rowtemp.GetCell().CellStyle = textStyle;

                rowtemp.GetCell().CellStyle = textStyle;

                rowtemp.GetCell().CellStyle = textStyle;

                rowtemp.GetCell().CellStyle = textStyle;

                rowtemp.GetCell().CellStyle = textStyle;

                rowtemp.GetCell().CellStyle = textStyle;

                rowtemp.GetCell().CellStyle = textStyle;

                rowtemp.GetCell().CellStyle = textStyle;

                rowtemp.GetCell().CellStyle = dateStyle;

                rowtemp.GetCell().CellStyle = dateStyle;

                rowtemp.GetCell().CellStyle = numberStyle;

                rowtemp.GetCell().CellStyle = numberStyle;

                rowtemp.GetCell().CellStyle = numberStyle;

                rowtemp.GetCell().CellStyle = numberStyle;

                rowtemp.GetCell().CellStyle = numberStyle;

                rowtemp.GetCell().CellStyle = numberStyle;

                rowtemp.GetCell().CellStyle = numberStyle;

                rowtemp.GetCell().CellStyle = numberStyle;

                rowtemp.GetCell().CellStyle = numberStyle;

                rowtemp.GetCell().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;
        }
    }
}

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