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NPOI支持对 Word 和 Excel 文件的操作！
针对 Word 的操作一般用于打印技术！说白了就是利用 Word 文件作为模板，生成各种不同的打印！具体用到的技术是：Word 关键字替换操作，Word 图片插入操作， Word 表格填充操作，Word 图表生成操作等等，在此就不一一介绍了，有兴趣的小虎斑可以参考鄙人博客：专业 web 打印组件 及 C# web项目利用docx文档作为模板~为打印专做的解决方案
针对 Excel 文件的操作一般常用的就两种：
1、将数据库数据导入至Excel
2、将 Excel 中数据导入至数据库
当然，针对Excel文件的操作也有其他优秀的组件实现，譬如：Spire.XLS，关于这个组件的运用，大家可参考我的博客：Spire.XLS，生成Excel文件、加载Excel文件
好了，说了这么多，咱们进入正题：
其实说到正题，也没什么可说的，都是一些代码，会调用就行了。
源代码如下：
using NPOI.HSSF.UserModel; using NPOI.SS.Formula.Eval; using NPOI.SS.UserModel; using System; using System.Collections.Generic; using System.Data; using System.IO; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Web; namespace KMHC.Infrastructure.Excel { public class ExcelHelper { #region DataTable导出至Excel /// <summary> /// 导出至Excel /// </summary> /// <param name="dt">数据源</param> /// <param name="templateName">Xls文件名 仅支持Xls扩展名</param> /// <returns></returns> public static string LoadForToExcel(DataTable dt, string templateName) { string mapPath = HttpContext.Current.Server.MapPath(VirtualPathUtility.GetDirectory("~")); string path = string.Format(@"{0}Templates\{1}.xls", mapPath, templateName); GridToExcelByNPOI(dt, path); return path; } /// <summary> /// 导出至Excel具体实现 /// </summary> /// <param name="dt">数据源</param> /// <param name="strExcelFileName">文件路径</param> private static void GridToExcelByNPOI(DataTable dt, string strExcelFileName ) { HSSFWorkbook workbook = new HSSFWorkbook(); try { ISheet sheet = workbook.CreateSheet("Sheet1"); ICellStyle HeadercellStyle = workbook.CreateCellStyle(); HeadercellStyle.BorderBottom = NPOI.SS.UserModel.BorderStyle.Thin; HeadercellStyle.BorderLeft = NPOI.SS.UserModel.BorderStyle.Thin; HeadercellStyle.BorderRight = NPOI.SS.UserModel.BorderStyle.Thin; HeadercellStyle.BorderTop = NPOI.SS.UserModel.BorderStyle.Thin; HeadercellStyle.Alignment = NPOI.SS.UserModel.HorizontalAlignment.Center; //字体 NPOI.SS.UserModel.IFont headerfont = workbook.CreateFont(); headerfont.Boldweight = (short)FontBoldWeight.Bold; HeadercellStyle.SetFont(headerfont); //用column name 作为列名 int icolIndex = 0; IRow headerRow = sheet.CreateRow(0); foreach (DataColumn item in dt.Columns) { ICell cell = headerRow.CreateCell(icolIndex); cell.SetCellValue(item.ColumnName); cell.CellStyle = HeadercellStyle; icolIndex++; } ICellStyle cellStyle = workbook.CreateCellStyle(); //为避免日期格式被Excel自动替换，所以设定 format 为 『@』 表示一率当成text來看 cellStyle.DataFormat = HSSFDataFormat.GetBuiltinFormat("@"); cellStyle.BorderBottom = NPOI.SS.UserModel.BorderStyle.Thin; cellStyle.BorderLeft = NPOI.SS.UserModel.BorderStyle.Thin; cellStyle.BorderRight = NPOI.SS.UserModel.BorderStyle.Thin; cellStyle.BorderTop = NPOI.SS.UserModel.BorderStyle.Thin; NPOI.SS.UserModel.IFont cellfont = workbook.CreateFont(); cellfont.Boldweight = (short)FontBoldWeight.Normal; cellStyle.SetFont(cellfont); //建立内容行 int iRowIndex = 1; int iCellIndex = 0; foreach (DataRow Rowitem in dt.Rows) { IRow DataRow = sheet.CreateRow(iRowIndex); foreach (DataColumn Colitem in dt.Columns) { ICell cell = DataRow.CreateCell(iCellIndex); cell.SetCellValue(Rowitem[Colitem].ToString()); cell.CellStyle = cellStyle; iCellIndex++; } iCellIndex = 0; iRowIndex++; } //自适应列宽度 for (int i = 0; i < icolIndex; i++) { sheet.AutoSizeColumn(i); } //写Excel FileStream file = new FileStream(strExcelFileName, FileMode.OpenOrCreate); workbook.Write(file);//将Excel文件保存到项目中 file.Flush(); file.Close(); //Log.WriteLog("导出Excel成功！"); } catch (Exception ex) { //Log.WriteLog("导出Excel异常：", ex); } finally { workbook = null; } } #endregion #region Excel文件数据导出至DataTable /// <summary> /// Excel数据导出至DataTable /// </summary> /// <param name="templateName">文件名</param> /// <param name="strTableName"></param> /// <param name="iSheetIndex">第几个Sheet的数据</param> public static DataTable LoadForToDataTable(string templateName, string strTableName, int iSheetIndex) { string mapPath = HttpContext.Current.Server.MapPath(VirtualPathUtility.GetDirectory("~"));//获取项目根目录 string path = string.Format(@"{0}Templates\{1}.xls", mapPath, templateName);//Templates 构造根目录路径 Templates 是项目的一个文件夹 return XlSToDataTable(path, strTableName, iSheetIndex); } /// <summary> /// Excel文件导成Datatable /// </summary> /// <param name="strFilePath">Excel文件目录地址</param> /// <param name="strTableName">Datatable表名</param> /// <param name="iSheetIndex">Excel sheet index</param> /// <returns></returns> private static DataTable XlSToDataTable(string strFilePath, string strTableName, int iSheetIndex) { string strExtName = Path.GetExtension(strFilePath); DataTable dt = new DataTable(); if (!string.IsNullOrEmpty(strTableName)) { dt.TableName = strTableName; } if (strExtName.Equals(".xls") || strExtName.Equals(".xlsx")) { using (FileStream file = new FileStream(strFilePath, FileMode.Open, FileAccess.Read)) { HSSFWorkbook workbook = new HSSFWorkbook(file); ISheet sheet = workbook.GetSheetAt(iSheetIndex); //列头 foreach (ICell item in sheet.GetRow(sheet.FirstRowNum).Cells) { dt.Columns.Add(item.ToString(), typeof(string)); } //写入内容 System.Collections.IEnumerator rows = sheet.GetRowEnumerator(); while (rows.MoveNext()) { IRow row = (HSSFRow)rows.Current; if (row.RowNum == sheet.FirstRowNum) { continue; } DataRow dr = dt.NewRow(); foreach (ICell item in row.Cells) { switch (item.CellType) { case CellType.Boolean: dr[item.ColumnIndex] = item.BooleanCellValue; break; case CellType.Error: dr[item.ColumnIndex] = ErrorEval.GetText(item.ErrorCellValue); break; case CellType.Formula: switch (item.CachedFormulaResultType) { case CellType.Boolean: dr[item.ColumnIndex] = item.BooleanCellValue; break; case CellType.Error: dr[item.ColumnIndex] = ErrorEval.GetText(item.ErrorCellValue); break; case CellType.Numeric: if (DateUtil.IsCellDateFormatted(item)) { dr[item.ColumnIndex] = item.DateCellValue.ToString("yyyy-MM-dd hh:MM:ss"); } else { dr[item.ColumnIndex] = item.NumericCellValue; } break; case CellType.String: string str = item.StringCellValue; if (!string.IsNullOrEmpty(str)) { dr[item.ColumnIndex] = str.ToString(); } else { dr[item.ColumnIndex] = null; } break; case CellType.Unknown: case CellType.Blank: default: dr[item.ColumnIndex] = string.Empty; break; } break; case CellType.Numeric: if (DateUtil.IsCellDateFormatted(item)) { dr[item.ColumnIndex] = item.DateCellValue.ToString("yyyy-MM-dd hh:MM:ss"); } else { dr[item.ColumnIndex] = item.NumericCellValue; } break; case CellType.String: string strValue = item.StringCellValue; if (!string.IsNullOrEmpty(strValue)) { dr[item.ColumnIndex] = strValue.ToString(); } else { dr[item.ColumnIndex] = null; } break; case CellType.Unknown: case CellType.Blank: default: dr[item.ColumnIndex] = string.Empty; break; } } dt.Rows.Add(dr); } } } return dt; } #endregion } }
具体调用如下：
public string Export() {////自己构造泛型：AllList //打印开始 自己构造泛型：AllList DataTable dt = new DataTable(); dt.Columns.Add("所属", typeof(string)); dt.Columns.Add("消费日期", typeof(string)); dt.Columns.Add("消费项", typeof(string)); dt.Columns.Add("类别", typeof(string)); dt.Columns.Add("会员卡", typeof(string)); dt.Columns.Add("现金", typeof(string)); dt.Columns.Add("支付宝", typeof(string)); dt.Columns.Add("微信", typeof(string)); dt.Columns.Add("一卡通", typeof(string)); foreach (var item in AllList) { DataRow dr = dt.NewRow(); dr["所属"] = ""; if (item.ServiceType.HasValue) { var dicModelForService = dicListForService.FirstOrDefault(A => A.ItemCode == item.ServiceType.ToString()); if (dicModelForService != null) { dr["所属"] = dicModelForService.ItemName; } } try { dr["消费日期"] = item.FeeDate.ToString("yyyy-MM-dd"); } catch { dr["消费日期"] = ""; } dr["消费项"] = item.FeeName; dr["类别"] = ""; if (item.FeeType.HasValue) { var dicModel = dicList.FirstOrDefault(A => A.ItemCode == item.FeeType.ToString()); if (dicModel != null) { dr["类别"] = dicModel.ItemName; } } // dr["会员卡"] = item.ResidentCard.HasValue ? Convert.ToDouble(-item.ResidentCard).ToString("0.00") : ""; dr["现金"] = item.Cash.HasValue ? Convert.ToDouble(-item.Cash).ToString("0.00") : ""; dr["支付宝"] = item.Alipay.HasValue ? Convert.ToDouble(-item.Alipay).ToString("0.00") : ""; dr["微信"] = item.WeChatpay.HasValue ? Convert.ToDouble(-item.WeChatpay).ToString("0.00") : ""; dr["一卡通"] = item.AllPurposeCard.HasValue ? Convert.ToDouble(-item.AllPurposeCard).ToString("0.00") : ""; dt.Rows.Add(dr); } return ExcelHelper.LoadForToExcel(dt, "FeeDetails"); }
前端Action视图代码如下：
public ActionResult Export() { IReportManageService service = IOCContainer.Instance.Resolve<IReportManageService>(); string pth = service.Export(); System.Web.HttpContext.Current.Response.Charset = "GB2312"; System.Web.HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.UTF8; Response.AddHeader("Content-type", "application/ms-excel"); Response.AddHeader("Accept-Ranges", "bytes"); Response.AddHeader("Content-Length", new System.IO.FileInfo(pth).Length.ToString()); Response.AddHeader("Content-Disposition", "attachment;filename=" + DateTime.Now.ToString("yyyyMMddhhssmm") + ".xls"); Response.WriteFile(pth); Response.End(); return View(); }
以上便是所有源代码，希望大家喜欢！
截图如下：
@陈卧龙的博客
