C#中pdf生成图片文字水印类的实现实例

本文实例讲述了C#实现的pdf生成图片文字水印类。分享给大家供大家参考，具体如下：

public class PDFSetWaterMark  {      /// <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)      {        //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 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)      {        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 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();        }      }  }

以上就是C#中pdf生成图片文字水印类的实现实例的详细内容，更多内容请关注技术你好其它相关文章！