IText&Html2canvas js截图 绘制 导出PDF

Html2canvas JS截图

HTML

 <div  id="divPDF">
 需要截图的区域
 </div>

JS

 <script src="../Js/html2canvas.js"></script>
 <script type="text/javascript">

         function getPDF() {
              html2canvas($('#divPDF'),
              {
                  onrendered: function (canvas) {
                      var imgUrl = canvas.toDataURL();//获取截图的Base64编码
                  }
              });
          }

 </script>

后台使用图片 Base64编码转换为图像

         // <summary>
         /// Base64编码转换为图像
         /// </summary>
         /// <param name="base64String">Base64字符串</param>
         /// <returns>转换成功返回图像；失败返回null</returns>
         public string Base64ToImage(string imgName, string base64String, string path)
         {
             base64String = base64String.Replace("data:image/png;base64,", "");
             MemoryStream ms = null;
             System.Drawing.Image image = null;
             string imgUrl = path + "\\" + imgName + ".png";
             byte[] imageBytes = Convert.FromBase64String(base64String);
             ms = new MemoryStream(imageBytes, , imageBytes.Length);
             ms.Write(imageBytes, , imageBytes.Length);
             image = System.Drawing.Image.FromStream(ms, true);
             image.Save(imgUrl);
             return imgUrl;
         }

给PDF文件添加水印 IText  WaterMark

         public void AddWaterMark(string fileLocation, string path, int x, int y)
         {
             string WatermarkLocation = path + "\\watermark.png";
             Document document = new Document();
             PdfReader pdfReader = new PdfReader(fileLocation);
             PdfStamper stamp = new PdfStamper(pdfReader, new FileStream(fileLocation.Replace(".pdf", "[temp][file].pdf"), FileMode.Create));

             iTextSharp.text.Image img = iTextSharp.text.Image.GetInstance(WatermarkLocation);
             img.SetAbsolutePosition(x, y); // set the position in the document where you want the watermark to appear (0,0 = bottom left corner of the page)
             PdfContentByte waterMark;
             for (int page = ; page <= pdfReader.NumberOfPages; page++)
             {
                 waterMark = stamp.GetOverContent(page);
                 waterMark.AddImage(img);
             }
             stamp.FormFlattening = true;
             stamp.Close();
             pdfReader.Close();
             // now delete the original file and rename the temp file to the original file
             File.Delete(fileLocation);
             File.Move(fileLocation.Replace(".pdf", "[temp][file].pdf"), fileLocation);

         }