C#利用iTextSharp组件给PDF文档添加图片/文字水印
最近在做关于PDF文档添加水印的功能，折腾了好久，终于好了。以下做个记录：
首先会用到iTextSharp组件，大家可以去官网下载，同时我也会在本文中附加进来。
代码中添加引用为：
using System; using System.Collections.Generic; using System.Linq; using System.Text; using iTextSharp.text.pdf; using System.IO; using iTextSharp.text;
创建一个显示指定图片的pdf
/// <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();
}
}
}
为PDF文档添加图片水印
/// <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();
}
}
添加普通偏转角度文字水印
/// <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();
}
}
添加倾斜水印
/// <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, per【自由互联：韩国服务器 转载请保留连接】mission);
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();
}
}
调用方法的例子：
string path = "D://my.pdf";
HtmlToPDFUtil.HtmlToPdf(Request.Url.AbsoluteUri, path);
//HtmlToPDFUtil.HtmlToPdf(sbUrlList.ToString(), path);
PDFSetWaterMark.PDFWatermark(path, "D://my.pdf", Server.MapPath("/HtmlToPdf/Tools/sy.bmp"), 0, 0);
PDFSetWaterMark.setWatermark("D://my.pdf", "D://my2.pdf", "TEST");
//PDFSetWaterMark.setWatermark("D://my.pdf", "D://my2.pdf", "TEST", "", "", 1);
附件：iTextSharp
总结
到此这篇关于C#利用iTextSharp组件给PDF文档添加图片/文字水印的文章就介绍到这了,更多相关iTextSharp组件给PDF添加水印内容请搜索海外IDC网以前的文章或继续浏览下面的相关文章希望大家以后多多支持海外IDC网！