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, 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();

}

}

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

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