A dynamic PDF stamp usually consists of some dynamic information, such as system date, time, and company information. This article will introduce how to add a dynamic rubber stamp to PDF by using Free Spire.PDF for Java.
Import jar dependency (2 Method)
● Download the Free Spire.PDF for Java and unzip it. Then add the Spire.Pdf.jar file to your project as dependency.
● Directly add the jar dependency to maven project by adding the following configurations to the pom.xml.
<repositories> <repository> <id>com.e-iceblue</id> <name>e-iceblue</name> <url>http://repo.e-iceblue.com/nexus/content/groups/public/</url> </repository> </repositories> <dependencies> <dependency> <groupId>e-iceblue</groupId> <artifactId>spire.pdf.free</artifactId> <version>4.3.0</version> </dependency> </dependencies> Sample Code
import com.spire.pdf.PdfDocument; import com.spire.pdf.PdfPageBase; import com.spire.pdf.annotations.PdfRubberStampAnnotation; import com.spire.pdf.annotations.appearance.PdfAppearance; import com.spire.pdf.graphics.*; import java.awt.*; import java.awt.geom.Point2D; import java.awt.geom.Rectangle2D; import java.text.SimpleDateFormat; public class DynamicStamp { public static void main(String[] args) { //create a PdfDocument object PdfDocument document = new PdfDocument(); //load a PDF file document.loadFromFile("input1.pdf"); //get the first page PdfPageBase page = document.getPages().get(0); //create a pdf template PdfTemplate template = new PdfTemplate(185, 50); //create two fonts PdfTrueTypeFont font1 = new PdfTrueTypeFont(new Font("Elephant", Font.ITALIC,16), true); PdfTrueTypeFont font2 = new PdfTrueTypeFont(new Font("Arial", Font.ITALIC ,10), true); //create a solid brush and a gradient brush PdfSolidBrush solidBrush = new PdfSolidBrush(new PdfRGBColor(Color.blue)); Rectangle2D rect1 = new Rectangle2D.Float(); rect1.setFrame(new Point2D.Float(0,0),template.getSize()); PdfLinearGradientBrush linearGradientBrush = new PdfLinearGradientBrush(rect1,new PdfRGBColor(Color.white),new PdfRGBColor(Color.orange),PdfLinearGradientMode.Horizontal); //create rounded rectangle path int CornerRadius = 20; PdfPath path = new PdfPath(); path.addArc(template.getBounds().getX(), template.getBounds().getY(), CornerRadius, CornerRadius, 180, 90); path.addArc(template.getBounds().getX() + template.getWidth() - CornerRadius,template.getBounds().getY(), CornerRadius, CornerRadius, 270, 90); path.addArc(template.getBounds().getX() + template.getWidth() - CornerRadius, template.getBounds().getY()+ template.getHeight() - CornerRadius, CornerRadius, CornerRadius, 0, 90); path.addArc(template.getBounds().getX(), template.getBounds().getY() + template.getHeight() - CornerRadius, CornerRadius, CornerRadius, 90, 90); path.addLine( template.getBounds().getX(), template.getBounds().getY() + template.getHeight() - CornerRadius, template.getBounds().getX(), template.getBounds().getY() + CornerRadius / 2); //draw path on the template template.getGraphics().drawPath(linearGradientBrush, path); template.getGraphics().drawPath(PdfPens.getRed(), path); //draw dynamic text on the template String s1 = "REVISED\n"; String s2 = "By XX Company at " + dateToString(new java.util.Date(),"yyyy-MM-dd HH:mm:ss"); template.getGraphics().drawString(s1, font1, solidBrush, new Point2D.Float(5, 5)); template.getGraphics().drawString(s2, font2, solidBrush, new Point2D.Float(2, 28)); //create a rubber stamp, specifying its size and location Rectangle2D rect2= new Rectangle2D.Float(); rect2.setFrame(new Point2D.Float((float)(page.getActualSize().getWidth()-250),(float)(page.getActualSize().getHeight()-120)), template.getSize()); PdfRubberStampAnnotation stamp = new PdfRubberStampAnnotation(rect2); //create a PdfAppearance object and apply the template as its normal state PdfAppearance appearance = new PdfAppearance(stamp); appearance.setNormal(template); //apply the appearance to stamp stamp.setAppearance(appearance); //add the stamp annotation to annotation collection page.getAnnotationsWidget().add(stamp); //save the file document.saveToFile("DynamicStamp.pdf"); document.close(); } //convert date to string public static String dateToString(java.util.Date date,String dateFormat) { SimpleDateFormat format = new SimpleDateFormat(dateFormat); return format.format(date); } } 
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