遇到需要导出页面到pdf，并添加pdf水印的业务。稍微研究了下，借阅网友的前车之鉴，经过使用可行之后的代码贴出来，做个记录，也供需要的网友借阅。
public class PDFSetWaterMark { /// <summary> /// 创建一个显示指定图片的pdf /// </summary> /// <param></param> /// <param></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></param> /// <param></param> /// <param></param> /// <param></param> /// <param></param> /// <returns></returns> public static bool PDFWatermark(string inputfilepath, string outputfilepath, string ModelPicName, float top, float left) { //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.GrayFill = 20;//透明度，灰色填充 //image.Rotation//旋转 //image.RotationDegrees//旋转角度 //水印的位置 if (left < 0) { left = width/2 - image.Width + left; } //image.SetAbsolutePosition(left, (height - image.Height) - top); image.SetAbsolutePosition(left, (height/2 - image.Height) - top); //每一页加水印,也可以设置某一页加水印 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); } //strMsg = "success"; 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></param> /// <param></param> /// <param></param> /// <param></param> public static void setWatermark(string inputfilepath, string outputfilepath,string waterMarkName) { 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\SIMFANG.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></param> /// <param></param> /// <param></param> /// <param></param> /// <param></param> /// <param></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(); } } }