net core 使用 iTextSharp 生成PDF
需求：按数据层级生成PDF文件，要有目录，目录里要有真实的页码，附件内容用表格显示，每页要有页码，大标题 做为封面当独显示一页，
PDF内容
大标题，
目录（里有对应的页码）
正文 里有 表格
每页还有页码
/// <summary> /// 生成 pdf 文件 /// </summary> /// <param name="model">实体对象</param> /// <param name="caseDetailsViewModels">数据LIST</param> /// <param name="TargetPath">目标文件路径</param> /// <param name="NewFileName">文件名</param> /// <returns></returns> private static string createPDF(ViewModel model, List<DetailsViewModel> DetailsViewModels, string TargetPath, string NewFileName) { string outMergeFile = TargetPath + NewFileName; if (Directory.Exists(outMergeFile)) { Directory.Delete(outMergeFile); } var pageSize = PageSize.A4; iTextSharp.text.Document document = new iTextSharp.text.Document(pageSize); PdfWriter writer = PdfWriter.GetInstance(document, new FileStream(outMergeFile, FileMode.Create)); try { document.Open(); #region 字体 Font BF_Light = FontFactory.GetFont(@"C:\Windows\Fonts\simsun.ttc,0", BaseFont.IDENTITY_H, BaseFont.EMBEDDED); Font bigTitle_Light = FontFactory.GetFont(@"C:\Windows\Fonts\simsun.ttc,0", BaseFont.IDENTITY_H, BaseFont.EMBEDDED); bigTitle_Light.Size = 20; Font title_Light = FontFactory.GetFont(@"C:\Windows\Fonts\simsun.ttc,0", BaseFont.IDENTITY_H, BaseFont.EMBEDDED); title_Light.SetColor(0, 0, 255); title_Light.Size = 16; Font body_Light = FontFactory.GetFont(@"C:\Windows\Fonts\simsun.ttc,0", BaseFont.IDENTITY_H, BaseFont.EMBEDDED); body_Light.Size = 12; //var titleFont = GetFont(); //titleFont.SetStyle(Font.BOLD); //titleFont.Color = BaseColor.BLACK; //titleFont.Size = 16; //new Font(baseFont2, 20f) #endregion //第一页 //段落 大标题 #region 大标题 var titleParagraph = new Paragraph(new Phrase(model.TitleModel.F_ContentStr, bigTitle_Light)); float x = 300; float y = document.PageSize.Height / 2; ColumnText.ShowTextAligned(writer.DirectContent, Element.ALIGN_CENTER, titleParagraph, x, y, 0); #endregion //第二页 #region 增加目录页 document.NewPage(); var catalogueP = new Paragraph(new Phrase("目录", body_Light)); //catalogueP.IndentationLeft = 160; //document.Add(catalogueP); //页头显示的位置 ColumnText.ShowTextAligned(writer.DirectContent, Element.ALIGN_CENTER, catalogueP, document.PageSize.Width / 2, document.Top, 0); foreach (var item in model.TwoTitleList) { Chunk leader = new Chunk(new DottedLineSeparator(), 400);//400 var F_ContentStrTxt = item.F_ContentStr.Trim(); Paragraph pp = new Paragraph(new Phrase(" " + F_ContentStrTxt, BF_Light)); pp.Add(leader); pp.Add(new Phrase(!string.IsNullOrEmpty(item.F_Page) ? item.F_Page : "1～1", BF_Light)); document.Add(pp); } #endregion //正文 //第三页 #region 正文 int iPageNum = 3; int beginPageNum = 3; BaseFont baseFont2 = BaseFont.CreateFont(@"C:\Windows\Fonts\simsun.ttc,0", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED); document.NewPage(); foreach (var item in model.TwoTitleList) { iPageNum = writer.PageNumber; //标题 document.Add(new Paragraph(new Phrase(item.F_ContentStr, title_Light))); foreach (var itemThree in item.ThreeContentList) { itemThree.F_ContentStr = itemThree.F_ContentStr.Replace("\r\n", string.Empty); //内容 if (itemThree.F_ContentStr.Contains("</p>")) { var contentStr = itemThree.F_ContentStr.Replace("<p>", string.Empty); var contentList = contentStr.Split("</p>"); foreach (var itemCon in contentList) { var itemConTxt = itemCon.Replace("\n", string.Empty).Trim(); var bydyPhrase = new Paragraph(new Phrase(" " + itemConTxt, body_Light)); document.Add(bydyPhrase); if (writer.PageNumber > iPageNum) { writePageNumber(document, writer, BF_Light); } } } else { var txt = itemThree.F_ContentStr.Replace("\n", string.Empty).Trim(); document.Add(new Paragraph(new Phrase(" " + txt, body_Light))); } } //if (writer.PageNumber > iPageNum) //{ item.F_Page = string.Format("{0}～{1}", iPageNum, writer.PageNumber); iPageNum = writer.PageNumber; //} } #endregion #region 附件 if (model.FileList != null && model.FileList.Count > 0) { var bydyPhrase1 = new Paragraph(new Phrase(" （一）检索结果分析列表", body_Light)); document.Add(bydyPhrase1); document.Add(new Paragraph(new Phrase(" "))); int groupNum = 1; foreach (var item in model.FileList) { var keywordTxt = item.Keyword.Replace("\n", string.Empty).Trim(); var bydyPhrase = new Paragraph(new Phrase(" " + keywordTxt, body_Light)); document.Add(bydyPhrase); document.Add(new Paragraph(new Phrase(" "))); PdfPTable table = new PdfPTable(4); int[] widths = { 40, 20, 20, 20 }; table.SetWidths(widths);//设置每列的宽度（求和百分比5,10=1,2） //为pdfpTable的构造函数传入整数3，pdfpTable被初始化为一个三列的表格 //PdfPCell cell = new PdfPCell(new Phrase("第一行 跨3列", BF_Light)); //cell.Colspan = 6;//跨3列 //0=Left, 1=Centre, 2=Right //table.AddCell(cell); PdfPCell cell = new PdfPCell(new Phrase("标题", BF_Light)); cell.HorizontalAlignment = 1; table.AddCell(cell); PdfPCell cel2 = new PdfPCell(new Phrase("案号", BF_Light)); cel2.HorizontalAlignment = 1; table.AddCell(cel2); PdfPCell cel3 = new PdfPCell(new Phrase("是否加入检索报告", BF_Light)); cel3.HorizontalAlignment = 1; table.AddCell(cel3); PdfPCell cel4 = new PdfPCell(new Phrase("未加入检索报告原因", BF_Light)); cel4.HorizontalAlignment = 1; table.AddCell(cel4); foreach (var itemKey in item.KeywordFileList) { table.AddCell(new Phrase(itemKey.F_CaseTitle, BF_Light)); table.AddCell(new Phrase(itemKey.F_CaseCode.ToString(), BF_Light)); table.AddCell(new Phrase(itemKey.F_IsAdd ? "是" : "否", BF_Light)); table.AddCell(new Phrase(itemKey.F_NoAddCause, BF_Light)); groupNum++; } document.Add(table); } } #endregion #region 生成案例 if (caseDetailsViewModels != null && caseDetailsViewModels.Count > 0) { var bydyPhrase2 = new Paragraph(new Phrase(" （二）检索案例全文", body_Light)); document.Add(bydyPhrase2); document.Add(new Paragraph(new Phrase(" "))); foreach (var item in caseDetailsViewModels) { foreach (var itemCase in item.CaseItemList) { //标题 itemCase.F_Title = itemCase.F_Title.Replace("\r\n", string.Empty); var F_TitleTxt = itemCase.F_Title.Trim(); document.Add(new Paragraph(new Phrase(" " + F_TitleTxt, body_Light))); //内容 itemCase.F_Content = itemCase.F_Content.Replace("\r\n", string.Empty); if (itemCase.F_Content.Contains("</p>")) { var contentStr = itemCase.F_Content.Replace("<p>", string.Empty); var contentList = contentStr.Split("</p>"); foreach (var itemCon in contentList) { var itemConTxt = itemCon.Replace("\n", string.Empty).Trim(); var bydyPhrase = new Paragraph(new Phrase(" " + itemConTxt, body_Light)); document.Add(bydyPhrase); if (writer.PageNumber > iPageNum) { writePageNumber(document, writer, BF_Light); } } } else { var F_ContentTxt = itemCase.F_Content.Replace("\n", string.Empty).Trim(); document.Add(new Paragraph(new Phrase(" " + F_ContentTxt, body_Light))); } } } } #endregion } catch (Exception ex) { LogFactory.GetLogger("createReportDetailsPDFCatalogue").Info("createReportDetailsPDFCatalogue 报错" + ex.Message); } finally { if (document != null) { document.Close(); } if (writer != null) { writer.Close(); } } return outMergeFile; } /// <summary> /// 写页码 /// </summary> /// <param name="document"></param> /// <param name="writer"></param> /// <param name="BF_Light"></param> private static void writePageNumber(iTextSharp.text.Document document, PdfWriter writer, Font BF_Light) { Phrase header = new Phrase("第" + (writer.PageNumber).ToString() + "页", BF_Light);// - 1 //页脚显示的位置 ColumnText.ShowTextAligned(writer.DirectContent, Element.ALIGN_CENTER, header, document.PageSize.Width / 2, document.Bottom, 0); }
调用,注意要调用两次，第一次生成时不知道目录里的内容在第几页，第一次在生成时收集页码。这时会生成一个临时文件。第二次生成的目录里的页码才是真实有效的数据。所以要生成两次。
就好比你在写WORD时也是不知道目录里的内容会写在第几次，都是一、二级标题和内容都写完后，再去生成目录的。这里的道理也是一样的。
var fileNameTempPath = createPDF(model, null, uploadPath, fileNameTemp);
var savePath = createPDF(model, caseDetailsViewModels, uploadPath, fileName);
如果有更好的方法请告诉我。
