這篇文章主要介紹了C#實現的pdf生成圖片文字水印類,結合完整實例形式分析了C#針對pdf文件的創建、添加文字、水印等相關操作技巧,需要的朋友可以參考下
本文實例講述了C#實現的pdf生成圖片文字水印類。分享給大家供大家參考，具體如下：
public class PDFSetWaterMark
{
///
/// 創建一個顯示指定圖片的pdf
///
///
///
///
public static bool CreatePDFByPic(string picPdfPath, string picPath)
{
//新建一個文檔
Document doc = new Document();
try
{
//建立一個書寫器(Writer)與document對象關聯
PdfWriter.GetInstance(doc, new FileStream(picPdfPath, FileMode.Create, FileAccess.ReadWrite));
//打開一個文檔
doc.Open();
//向文檔中添加內容
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();
}
}
}
///
/// 加圖片水印
///
///
///
///
///
///
///
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//旋轉
//image.RotationDegrees//旋轉角度
//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);
//每一頁加水印,也可以設置某一頁加水印
for (int i = 1; i <= numberOfPages; i++)
{
//waterMarkContent = pdfStamper.GetUnderContent(i);//內容下層加水印
waterMarkContent = pdfStamper.GetOverContent(i);//內容上層加水印
waterMarkContent.AddImage(image);
}
//strMsg = "success";
return true;
}
catch (Exception ex)
{
throw ex;
}
finally
{
if (pdfStamper != null)
pdfStamper.Close();
if (pdfReader != null)
pdfReader.Close();
}
}
///
/// 添加普通偏轉角度文字水印
///
///
///
///
///
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);//在內容上方加水印
//content = pdfStamper.GetUnderContent(i);//在內容下方加水印
//透明度
gs.FillOpacity = 0.3f;
content.SetGState(gs);
//content.SetGrayFill(0.3f);
//開始寫入文本
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();
}
}
///
/// 添加傾斜水印
///
///
///
///
///
///
///
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));
// 設置密碼
//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);//在內容上方加水印
//content = pdfStamper.GetUnderContent(i);//在內容下方加水印
content.BeginText();
content.SetColorFill(BaseColor.DARK_GRAY);
content.SetFontAndSize(font, 50);
// 設置水印文字字體傾斜 開始
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;
}
}
// 字體設置結束
content.EndText();
// 畫一個圓
//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();
}
}
}
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