Nopi读取excel/excel 导出

 

转自 http://blog.csdn.net/coderk2014/article/details/50185163

一、下载引用

下载需要引用的dll，即：NPOI.dll，NPOI.OOXML.dll，NPOI.OpenXml4Net.dll，ICSharpCode.SharpZipLib.dll（office2007版需要此dll）。

二、excel转datatable类


  #region NOPIExcel转化为dataTable  

    using NPOI.SS.UserModel;
    using NPOI.XSSF.UserModel;
    using NPOI.HSSF.UserModel;
    using NPOI.SS.Util;
    public class ExcelUtility
    {
        /// <summary>
        /// 将excel导入到datatable
        /// </summary>
        /// <param name="filePath">excel路径</param>
        /// <param name="isColumnName">第一行是否是列名</param>
        /// <returns>返回datatable</returns>
        public System.Data.DataTable ExcelToDataTable(string filePath, bool isColumnName)
        {
            System.Data.DataTable dataTable = null;
            FileStream fs = null;
            DataColumn column = null;
            DataRow dataRow = null;
            IWorkbook workbook = null;
            ISheet sheet = null;
            IRow row = null;
            ICell cell = null;
            int startRow = 0;
            try
            {
                using (fs = File.OpenRead(filePath))
                {
                    // 2007版本
                    if (filePath.IndexOf(".xlsx") > 0)
                        workbook = new XSSFWorkbook(fs);
                    // 2003版本
                    else if (filePath.IndexOf(".xls") > 0)
                        workbook = new HSSFWorkbook(fs);

                    if (workbook != null)
                    {
                        sheet = workbook.GetSheetAt(0);//读取第一个sheet，当然也可以循环读取每个sheet
                        dataTable = new System.Data.DataTable();
                        if (sheet != null)
                        {
                            int rowCount = sheet.LastRowNum;//总行数
                            if (rowCount > 0)
                            {
                                IRow firstRow = sheet.GetRow(0);//第一行
                                int cellCount = firstRow.LastCellNum;//列数

                                //构建datatable的列
                                if (isColumnName)
                                {
                                    startRow = 1;//如果第一行是列名，则从第二行开始读取
                                    for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
                                    {
                                        cell = firstRow.GetCell(i);
                                        if (cell != null)
                                        {
                                            if (cell.StringCellValue != null)
                                            {
                                                column = new DataColumn(cell.StringCellValue);
                                                dataTable.Columns.Add(column);
                                            }
                                        }
                                    }
                                }
                                else
                                {
                                    for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
                                    {
                                        column = new DataColumn("column" + (i + 1));
                                        dataTable.Columns.Add(column);
                                    }
                                }

                                //填充行
                                for (int i = startRow; i <= rowCount; ++i)
                                {
                                    row = sheet.GetRow(i);
                                    if (row == null) continue;

                                    dataRow = dataTable.NewRow();
                                    for (int j = row.FirstCellNum; j < cellCount; ++j)
                                    {
                                        cell = row.GetCell(j);
                                        if (cell == null)
                                        {
                                            dataRow[j] = "";
                                        }
                                        else
                                        {
                                            //CellType(Unknown = -1,Numeric = 0,String = 1,Formula = 2,Blank = 3,Boolean = 4,Error = 5,)
                                            switch (cell.CellType)
                                            {
                                                case CellType.Blank:
                                                    dataRow[j] = "";
                                                    break;
                                                case CellType.Numeric:
　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　//这里判断的是日期格式数据 自己稍微做了修改
                                                    if (DateUtil.IsCellDateFormatted(cell))
                                                    {
                                                        SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");//设置日期格式
                                                        dataRow[j] = df.Format(cell.DateCellValue);
                                                    }
                                                    else
                                                    {
                                                        dataRow[j] = cell.NumericCellValue;
                                                    }
                                                    //short format = cell.CellStyle.DataFormat;
                                                    ////对时间格式（2015.12.5、2015/12/5、2015-12-5等）的处理
                                                    //if (format == 14 || format == 31 || format == 57 || format == 58)
                                                    //    dataRow[j] = cell.DateCellValue;
                                                    //else
                                                    //    dataRow[j] = cell.NumericCellValue;
                                                    break;
                                                case CellType.String:
                                                    dataRow[j] = cell.StringCellValue;
                                                    break;
                                            }
                                        }
                                    }
                                    dataTable.Rows.Add(dataRow);
                                }
                            }
                        }
                    }
                }
                return dataTable;
            }
            catch (Exception)
            {
                if (fs != null)
                {
                    fs.Close();
                }
                return null;
            }
        }
    }

    #endregion

gridview excel 导出 

  private void Export(GridView gvUser, string FileType, string FileName)
    {
        base.Response.ClearContent();
        base.Response.Charset = "GB2312";
        base.Response.ContentEncoding = Encoding.UTF8;
      //导出乱码的问题 这句可以解决
        base.Response.Write("<meta http-equiv=Content-Type content=text/html;charset=UTF-8>");

        base.Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(FileName, Encoding.UTF8).ToString());
        base.Response.ContentType = FileType;
        this.Page.EnableViewState = false;
        StringWriter writer = new StringWriter();
        HtmlTextWriter writer2 = new HtmlTextWriter(writer);
        gvUser.RenderControl(writer2);
        base.Response.Write(writer.ToString());
        base.Response.End();
    }

 private void Export(GridView gvUser, string FileType, string FileName)
    {
        base.Response.ClearContent();
        base.Response.Charset = "GB2312";
        base.Response.ContentEncoding = Encoding.UTF8;
        base.Response.Write("<meta http-equiv=Content-Type content=text/html;charset=UTF-8>");
        base.Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(FileName, Encoding.UTF8).ToString());
        base.Response.ContentType = FileType;
        this.Page.EnableViewState = false;
        StringWriter writer = new StringWriter();
        HtmlTextWriter writer2 = new HtmlTextWriter(writer);
        gvUser.AllowPaging = false;
        this.LoadData(strWhere + strOrder);
        gvUser.RenderControl(writer2);
        base.Response.Write(writer.ToString());
        base.Response.End();
        gvUser.AllowPaging = true;
        this.LoadData(strWhere + strOrder);
    }