文字水印感觉有些问题，可能是字体的原因
图片水印的透明度设置无效
但勉强可以用
iTextSharp.dll版本5.2.1.0
using System; using System.Collections.Generic; using System.Linq; using System.Text; using iTextSharp.text.pdf; using iTextSharp.text; using iTextSharp.text.pdf.parser; using System.IO; namespace ErrorCheckerForPDF { public static class PvPDF { /// <summary> /// 读取PDF文件中的内容 /// </summary> /// <param name="fn">文件名FullName</param> /// <returns></returns> public static string readPDF(this string fn) { //从一个对话框打开一个pdf文件，并创建一个读取该文件的PdfReader PdfReader reader = new PdfReader(fn); PdfReaderContentParser parser = new PdfReaderContentParser(reader); ITextExtractionStrategy strategy; strategy = parser.ProcessContent<SimpleTextExtractionStrategy>(1, new SimpleTextExtractionStrategy()); return strategy.GetResultantText(); } /// <summary> /// 创建一个显示指定图片的pdf /// </summary> /// <param name="picPdfPath"></param> /// <param name="picPath"></param> /// <returns></returns> public static bool CreatePDFByPic(string picPdfPath, string picPath) { //新建一个文档 Document doc = new Document(); try { //建立一个书写器(Writer)与document对象关联 PdfWriter.GetInstance(doc, new FileStream(picPdfPath, FileMode.Create, FileAccess.ReadWrite)); //打开一个文档 doc.Open(); //向文档中添加内容 Image img = Image.GetInstance(picPath); //img.SetAbsolutePosition(); doc.Add(img); return true; } catch (Exception ex) { return false; throw ex; } finally { if (doc != null) { doc.Close(); } } } /// <summary> /// 加图片水印 /// </summary> /// <param name="inputfilepath"></param> /// <param name="outputfilepath"></param> /// <param name="ModelPicName"></param> /// <param name="top"></param> /// <param name="left"></param> /// <returns></returns> public static bool PDFWatermark(string inputfilepath, string outputfilepath, string ModelPicName, float top, float left,bool onlyForFirstPage=true) { //throw new NotImplementedException(); PdfReader pdfReader = null; PdfStamper pdfStamper = null; try { pdfReader = new PdfReader(inputfilepath); int numberOfPages = pdfReader.NumberOfPages; iTextSharp.text.Rectangle psize = pdfReader.GetPageSize(1); float width = psize.Width; float height = psize.Height; pdfStamper = new PdfStamper(pdfReader, new FileStream(outputfilepath, FileMode.Create)); PdfContentByte waterMarkContent; iTextSharp.text.Image image = iTextSharp.text.Image.GetInstance(ModelPicName); image.ScaleToFit(20f, 20f); //此处GrayFill有问题，无法修改透明度 //image.GrayFill = 70F;//透明度，灰色填充 //image.Rotation = 45;//旋转 //水印的位置 if (left > width - 20) { left = width - 20; } else if (left < 0) { left = width / 2 - 20 + left; } if (top > height - 20) { top = height - 20; } else if (top < 0) { top = height / 2 - 20 + top; } image.SetAbsolutePosition(left, top); //每一页加水印,也可以设置某一页加水印 if (onlyForFirstPage) { numberOfPages = 1; } for (int i = 1; i <= numberOfPages; i++) { waterMarkContent = pdfStamper.GetUnderContent(i);//内容下层加水印 //waterMarkContent = pdfStamper.GetOverContent(i);//内容上层加水印 waterMarkContent.AddImage(image); } return true; } catch (Exception ex) { throw ex; } finally { if (pdfStamper != null) pdfStamper.Close(); if (pdfReader != null) pdfReader.Close(); } } /// <summary> /// 添加普通偏转角度文字水印 /// </summary> /// <param name="inputfilepath"></param> /// <param name="outputfilepath"></param> /// <param name="waterMarkName"></param> /// <param name="permission"></param> public static void setWatermark(string inputfilepath, string outputfilepath, string waterMarkName,bool onlyForFirstPage=true) { PdfReader pdfReader = null; PdfStamper pdfStamper = null; try { pdfReader = new PdfReader(inputfilepath); pdfStamper = new PdfStamper(pdfReader, new FileStream(outputfilepath, FileMode.Create)); int total = pdfReader.NumberOfPages + 1; iTextSharp.text.Rectangle psize = pdfReader.GetPageSize(1); float width = psize.Width; float height = psize.Height; PdfContentByte content; BaseFont font = BaseFont.CreateFont(@"C:\WINDOWS\Fonts\SIMYOU.TTF", BaseFont.IDENTITY_H, BaseFont.EMBEDDED); PdfGState gs = new PdfGState(); for (int i = 1; i < total; i++) { content = pdfStamper.GetOverContent(i);//在内容上方加水印 //content = pdfStamper.GetUnderContent(i);//在内容下方加水印 //透明度 gs.FillOpacity = 0.3f; content.SetGState(gs); //content.SetGrayFill(0.3f); //开始写入文本 content.BeginText(); content.SetColorFill(BaseColor.LIGHT_GRAY); content.SetFontAndSize(font, 100); content.SetTextMatrix(0, 0); content.ShowTextAligned(Element.ALIGN_CENTER, waterMarkName, width / 2 - 50, height / 2 - 50, 55); //content.SetColorFill(BaseColor.BLACK); //content.SetFontAndSize(font, 8); //content.ShowTextAligned(Element.ALIGN_CENTER, waterMarkName, 0, 0, 0); content.EndText(); } } catch (Exception ex) { throw ex; } finally { if (pdfStamper != null) pdfStamper.Close(); if (pdfReader != null) pdfReader.Close(); } } /// <summary> /// 添加倾斜水印 /// </summary> /// <param name="inputfilepath"></param> /// <param name="outputfilepath"></param> /// <param name="waterMarkName"></param> /// <param name="userPassWord"></param> /// <param name="ownerPassWord"></param> /// <param name="permission"></param> public static void setWatermark(string inputfilepath, string outputfilepath, string waterMarkName, string userPassWord, string ownerPassWord, int permission) { PdfReader pdfReader = null; PdfStamper pdfStamper = null; try { pdfReader = new PdfReader(inputfilepath); pdfStamper = new PdfStamper(pdfReader, new FileStream(outputfilepath, FileMode.Create)); // 设置密码 //pdfStamper.SetEncryption(false,userPassWord, ownerPassWord, permission); int total = pdfReader.NumberOfPages + 1; PdfContentByte content; BaseFont font = BaseFont.CreateFont(@"C:\WINDOWS\Fonts\SIMFANG.TTF", BaseFont.IDENTITY_H, BaseFont.EMBEDDED); PdfGState gs = new PdfGState(); gs.FillOpacity = 0.2f;//透明度 int j = waterMarkName.Length; char c; int rise = 0; for (int i = 1; i < total; i++) { rise = 500; content = pdfStamper.GetOverContent(i);//在内容上方加水印 //content = pdfStamper.GetUnderContent(i);//在内容下方加水印 content.BeginText(); content.SetColorFill(BaseColor.DARK_GRAY); content.SetFontAndSize(font, 50); // 设置水印文字字体倾斜 开始 if (j >= 15) { content.SetTextMatrix(200, 120); for (int k = 0; k < j; k++) { content.SetTextRise(rise); c = waterMarkName[k]; content.ShowText(c + ""); rise -= 20; } } else { content.SetTextMatrix(180, 100); for (int k = 0; k < j; k++) { content.SetTextRise(rise); c = waterMarkName[k]; content.ShowText(c + ""); rise -= 18; } } // 字体设置结束 content.EndText(); // 画一个圆 //content.Ellipse(250, 450, 350, 550); //content.SetLineWidth(1f); //content.Stroke(); } } catch (Exception ex) { throw ex; } finally { if (pdfStamper != null) pdfStamper.Close(); if (pdfReader != null) pdfReader.Close(); } } } }