此演示向您展示如何将文本水印或图像水印添加到 PDF 文档。

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Set text watermark

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Font:	Aharoni Andalus Angsana New AngsanaUPC Aparajita Arabic Typesetting Arial Arial Black Arial Unicode MS Batang BatangChe Browallia New BrowalliaUPC Calibri Calibri Light Cambria Cambria Math Candara Comic Sans MS Consolas Constantia Corbel Cordia New CordiaUPC Courier New DaunPenh David DFKai-SB DilleniaUPC DokChampa Dotum DotumChe Ebrima Estrangelo Edessa EucrosiaUPC Euphemia FangSong Franklin Gothic Medium FrankRuehl FreesiaUPC Gabriola Gautami Georgia Gisha Gulim GulimChe Gungsuh GungsuhChe Impact IrisUPC Iskoola Pota JasmineUPC KaiTi Kalinga Kartika Khmer UI KodchiangUPC Kokila Lao UI Latha Leelawadee Levenim MT LilyUPC Lucida Console Lucida Sans Unicode Malgun Gothic Mangal Marlett Meiryo Meiryo UI Microsoft Himalaya Microsoft JhengHei Microsoft New Tai Lue Microsoft PhagsPa Microsoft Sans Serif Microsoft Tai Le Microsoft Uighur Microsoft YaHei Microsoft Yi Baiti MingLiU MingLiU-ExtB MingLiU_HKSCS MingLiU_HKSCS-ExtB Miriam Miriam Fixed Mongolian Baiti MoolBoran MS Gothic MS Mincho MS PGothic MS PMincho MS UI Gothic MV Boli Narkisim NSimSun Nyala Palatino Linotype Plantagenet Cherokee PMingLiU PMingLiU-ExtB Raavi Rod Sakkal Majalla Segoe Print Segoe Script Segoe UI Segoe UI Light Segoe UI Semibold Segoe UI Symbol Shonar Bangla Shruti SimHei Simplified Arabic Simplified Arabic Fixed SimSun SimSun-ExtB Sylfaen Symbol Tahoma Times New Roman Traditional Arabic Trebuchet MS Tunga Utsaah Vani Verdana Vijaya Vrinda Webdings Wingdings
Font Size:	The font size must be a valid number. The font size must be a valid number.
Color:	The format of color value must be rrggbb.
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Set image watermark

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import com.spire.pdf.FileFormat;import com.spire.pdf.PdfDocument;import com.spire.pdf.PdfPageBase;import com.spire.pdf.graphics.*;import java.awt.*;import java.awt.geom.Dimension2D;import java.awt.geom.Point2D;import java.awt.geom.Rectangle2D;import java.io.ByteArrayInputStream;public class PdfWatermarkDemo{public void addWatermark(String pdfFile,String watermarkType,String text,byte[] imageData){String outputFile = "output.pdf";PdfDocument pdf=new PdfDocument();pdf.loadFromFile(pdfFile);switch (watermarkType){case "Text":addTextWatermark(pdf,text);break;case "Image":addImageWatermark(pdf,imageData);break;}pdf.saveToFile(outputFile,FileFormat.PDF);pdf.close();}public void addImageWatermark(PdfDocument pdf,byte[] imgData){PdfImage image = PdfImage.fromStream(new ByteArrayInputStream(imgData));for (int i = 0;i <pdf.getPages().getCount();i++){PdfPageBase page = pdf.getPages().get(i);page.getCanvas().save();page.getCanvas().setTransparency(0.5f,0.5f,PdfBlendMode.Multiply);page.getCanvas().drawImage(image,new Point2D.Float(160,260));page.getCanvas().restore();}}public void addTextWatermark(PdfDocument pdf,String text){for (int i = 0;i <pdf.getPages().getCount();i++){PdfPageBase page = pdf.getPages().get(i);Dimension2D dimension2D = new Dimension();dimension2D.setSize(page.getCanvas().getClientSize().getWidth() / 2,page.getCanvas().getClientSize().getHeight() / 3);PdfTilingBrush brush = new PdfTilingBrush(dimension2D);brush.getGraphics().setTransparency(0.3F);brush.getGraphics().save();brush.getGraphics().translateTransform((float) brush.getSize().getWidth() / 2,(float) brush.getSize().getHeight() / 2);brush.getGraphics().rotateTransform(-45);brush.getGraphics().drawString(text,new PdfTrueTypeFont(new Font("Arial",Font.BOLD,80),true),PdfBrushes.getViolet(),0,0,new PdfStringFormat(PdfTextAlignment.Center));brush.getGraphics().restore();brush.getGraphics().setTransparency(0.5);Rectangle2D loRect = new Rectangle2D.Float();loRect.setFrame(new Point2D.Float(0,0),page.getCanvas().getClientSize());page.getCanvas().drawRectangle(brush,loRect);}}}

using Spire.Pdf;using Spire.Pdf.Graphics;using System.Drawing;using System.IO;namespace DemoOnlineCode{class WatermarkDemo{public void addWatermark(string pdfFile,string watermarkType,string text,byte[] imageData){string outputFile = "output.pdf";PdfDocument pdf = new PdfDocument();pdf.LoadFromFile(pdfFile);switch (watermarkType){case "Text":addTextWatermark(pdf,text);break;case "Image":addImageWatermark(pdf,imageData);break;}pdf.SaveToFile(outputFile,FileFormat.PDF);pdf.Close();}public void addImageWatermark(PdfDocument pdf,byte[] imgData){PdfImage image = PdfImage.FromStream(new MemoryStream(imgData));for (int i = 0;i <pdf.Pages.Count;i++){PdfPageBase page = pdf.Pages[i];page.Canvas.Save();page.Canvas.SetTransparency(0.5f,0.5f,PdfBlendMode.Multiply);page.Canvas.DrawImage(image,new System.Drawing.PointF(160,260));page.Canvas.Restore();}}public void addTextWatermark(PdfDocument pdf,string text){for (int i = 0;i <pdf.Pages.Count;i++){PdfPageBase page = pdf.Pages[i];PdfTilingBrush brush = new PdfTilingBrush(new SizeF(page.Canvas.ClientSize.Width / 2,page.Canvas.ClientSize.Height / 3));brush.Graphics.SetTransparency(0.3F);brush.Graphics.Save();brush.Graphics.TranslateTransform(brush.Size.Width / 2,brush.Size.Height / 2);brush.Graphics.RotateTransform(-45);brush.Graphics.DrawString(text,new PdfTrueTypeFont(new Font("Arial",80,FontStyle.Bold),true),PdfBrushes.Violet,0,0,new PdfStringFormat(PdfTextAlignment.Center));brush.Graphics.Restore();brush.Graphics.SetTransparency(0.5f);page.Canvas.DrawRectangle(brush,new RectangleF(new PointF(0,0),page.Canvas.ClientSize));}}}}