ITextSharp插入文本到现有的PDF

标题总结了这一切。

我想使用iTextSharp将文本添加到现有的PDF文件，但是我找不到如何在networking中的任何位置执行此操作。

PS：我不能使用PDF表单。

提前致谢

Answer 1

我find了一个方法来做到这一点（不知道这是否是最好的，但它的工作原理）

string oldFile = "oldFile.pdf"; string newFile = "newFile.pdf"; // open the reader PdfReader reader = new PdfReader(oldFile); Rectangle size = reader.GetPageSizeWithRotation(1); Document document = new Document(size); // open the writer FileStream fs = new FileStream(newFile, FileMode.Create, FileAccess.Write); PdfWriter writer = PdfWriter.GetInstance(document, fs); document.Open(); // the pdf content PdfContentByte cb = writer.DirectContent; // select the font properties BaseFont bf = BaseFont.CreateFont(BaseFont.HELVETICA, BaseFont.CP1252,BaseFont.NOT_EMBEDDED); cb.SetColorFill(BaseColor.DARK_GRAY); cb.SetFontAndSize(bf, 8); // write the text in the pdf content cb.BeginText(); string text = "Some random blablablabla..."; // put the alignment and coordinates here cb.ShowTextAligned(1, text, 520, 640, 0); cb.EndText(); cb.BeginText(); text = "Other random blabla..."; // put the alignment and coordinates here cb.ShowTextAligned(2, text, 100, 200, 0); cb.EndText(); // create the new page and add it to the pdf PdfImportedPage page = writer.GetImportedPage(reader, 1); cb.AddTemplate(page, 0, 0); // close the streams and voilá the file should be changed :) document.Close(); fs.Close(); writer.Close(); reader.Close(); 

我希望这可以是有用的=）（并在这里发布任何错误）

Answer 2

除上面的优秀答案之外，下面还介绍了如何向多页文档的每个页面添加文本：

  using (var reader = new PdfReader(@"C:\Input.pdf")) { using (var fileStream = new FileStream(@"C:\Output.pdf", FileMode.Create, FileAccess.Write)) { var document = new Document(reader.GetPageSizeWithRotation(1)); var writer = PdfWriter.GetInstance(document, fileStream); document.Open(); for (var i = 1; i <= reader.NumberOfPages; i++) { document.NewPage(); var baseFont = BaseFont.CreateFont(BaseFont.HELVETICA_BOLD, BaseFont.CP1252, BaseFont.NOT_EMBEDDED); var importedPage = writer.GetImportedPage(reader, i); var contentByte = writer.DirectContent; contentByte.BeginText(); contentByte.SetFontAndSize(baseFont, 12); var multiLineString = "Hello,\r\nWorld!".Split('\n'); foreach (var line in multiLineString) { contentByte.ShowTextAligned(PdfContentByte.ALIGN_LEFT, line, 200, 200, 0); } contentByte.EndText(); contentByte.AddTemplate(importedPage, 0, 0); } document.Close(); writer.Close(); } } 

Answer 3

这工作对我来说，包括使用OutputStream：

 PdfReader reader = new PdfReader(new RandomAccessFileOrArray(Request.MapPath("Template.pdf")), null); Rectangle size = reader.GetPageSizeWithRotation(1); using (Stream outStream = Response.OutputStream) { Document document = new Document(size); PdfWriter writer = PdfWriter.GetInstance(document, outStream); document.Open(); try { PdfContentByte cb = writer.DirectContent; cb.BeginText(); try { cb.SetFontAndSize(BaseFont.CreateFont(), 12); cb.SetTextMatrix(110, 110); cb.ShowText("aaa"); } finally { cb.EndText(); } PdfImportedPage page = writer.GetImportedPage(reader, 1); cb.AddTemplate(page, 0, 0); } finally { document.Close(); writer.Close(); reader.Close(); } } 

Answer 4

这是一个使用不同的PDF客户端（ Adobe ， FoxIt等）显示的压模和绝对坐标的方法。

 public static void AddTextToPdf(string inputPdfPath, string outputPdfPath, string textToAdd, Point point) { //variables string pathin = inputPdfPath; string pathout = outputPdfPath; //create PdfReader object to read from the existing document using (PdfReader reader = new PdfReader(pathin)) //create PdfStamper object to write to get the pages from reader using (PdfStamper stamper = new PdfStamper(reader, new FileStream(pathout, FileMode.Create))) { //select two pages from the original document reader.SelectPages("1-2"); //gettins the page size in order to substract from the iTextSharp coordinates var pageSize = reader.GetPageSize(1); // PdfContentByte from stamper to add content to the pages over the original content PdfContentByte pbover = stamper.GetOverContent(1); //add content to the page using ColumnText Font font = new Font(); font.Size = 45; //setting up the X and Y coordinates of the document int x = point.X; int y = point.Y; y = (int) (pageSize.Height - y); ColumnText.ShowTextAligned(pbover, Element.ALIGN_CENTER, new Phrase(textToAdd, font), x, y, 0); } }