Java: Add Stamps to a PDF Document

When it comes to PDF documents, stamps offer an indispensable feature for adding contextual information and visual elements. These stamps can range from simple notes to complex graphics, enabling users to annotate, emphasize, or personalize their PDF content. With the ability to place stamps strategically, businesses can streamline workflows, indicate approvals, or provide concise feedback.

In this article, you will learn how to programmatically add dynamic stamps and image stamps to a PDF document using Spire.PDF for Java.

Install Spire.PDF for Java

To start, make sure to add the Spire.Pdf.jar file as a dependency in your Java program. You can download Spire.PDF for Java from our website and manually import the JAR file into your application. If you are using Maven, simply add the following code to your project's pom.xml file to include the JAR file effortlessly.

<repositories>
    <repository>
        <id>com.e-iceblue</id>
        <name>e-iceblue</name>
        <url>https://repo.e-iceblue.com/nexus/content/groups/public/</url>
    </repository>
</repositories>
<dependencies>
    <dependency>
        <groupId>e-iceblue</groupId>
        <artifactId>spire.pdf</artifactId>
        <version>10.2.6</version>
    </dependency>
</dependencies>
    

Prior Knowledge

In PDF, a stamp refers to an annotation or graphical element that can be added to a document to provide additional information. Spire.PDF for Java introduces the PdfRubberStampAnnotation class, which serves as a representation of a rubber stamp. To create the visual representation of a rubber stamp, the PdfTemplate class is employed. This class acts as a canvas allowing you to draw various types of information, including text, images, shapes, and date/time elements.

Add a Dynamic Stamp to PDF in Java

A dynamic stamp refers to a customizable annotation that can be added to a PDF document to indicate a specific status, approval, or other information. Unlike static stamps, dynamic stamps contain variables or fields that can be dynamically updated, such as the current date, time, username, or any other custom data.

The following are the steps to add a dynamic stamp to PDF using Spire.PDF for Java.

  • Create a PdfDocument object.
  • Load a PDF file using PdfDocument.loadFromFile() method.
  • Create a PdfTemplate object with desired size.
  • Draw strings (including dynamic information such as date and time) on the template using PdfTemplate.getGraphics().drawString() method.
  • Create a PdfRubberStampAnnotation object, and set the template as its appearance.
  • Add the stamp to a specific PDF page using PdfPageBase.getAnnotationsWidget().add() method.
  • Save the document to a different PDF file using PdfDocument.saveToFile() method.
  • Java
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 AddDynamicStampToPdf {

    public static void main(String[] args) {

        // Create a PdfDocument object
        PdfDocument document = new PdfDocument();

        // Load a PDF file
        document.loadFromFile("C:\\Users\\Administrator\\Desktop\\Input.pdf");

        // Get the last page
        PdfPageBase page = document.getPages().get(document.getPages().getCount() - 1);

        // Create a PdfTemplate object
        PdfTemplate template = new PdfTemplate(195, 50);

        // Create two fonts
        PdfTrueTypeFont font1 = new PdfTrueTypeFont(new Font("Elephant", Font.ITALIC, 15), 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.black));
        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 = 10;
        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 = "APPROVED\n";
        String s2 = "By Manager 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(50, (float) (page.getActualSize().getHeight() - 300)), 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("output/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);
    }
}

Java: Add Stamps to a PDF Document

Add an Image Stamp to PDF in Java

An image stamp in PDF refers to a graphical element that is added to a document as an annotation or overlay. It involves placing an image onto a specific location within a PDF page.

The steps to add an image stamp to PDF using Spire.PDF for Java are as follows.

  • Create a PdfDocument object.
  • Load a PDF file using PdfDocument.loadFromFile() method.
  • Load an image that you want to stamp on PDF using PdfImage.fromFile() method.
  • Create a PdfTemplate object based on the size of the image.
  • Draw the image on the template using PdfTemplate.getGraphics().drawImage() method.
  • Create a PdfRubberStampAnnotation object, and set the template as its appearance.
  • Add the stamp to a specific PDF page using PdfPageBase.getAnnotationsWidget().add() method.
  • Save the document to a different PDF file using PdfDocument.saveToFile() method.
  • Java
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.PdfImage;
import com.spire.pdf.graphics.PdfTemplate;

import java.awt.geom.Rectangle2D;

public class AddImageStampToPdf {

    public static void main(String[] args) {

        // Create a PdfDocument object
        PdfDocument document = new PdfDocument();

        // Load a PDF document
        document.loadFromFile("C:\\Users\\Administrator\\Desktop\\Input.pdf");

        // Get the last page
        PdfPageBase page = document.getPages().get(document.getPages().getCount() - 1);

        // Load an image file
        PdfImage image = PdfImage.fromFile("C:\\Users\\Administrator\\Desktop\\stamp-image.png");

        // Get the width and height of the image
        int width = image.getWidth();
        int height = image.getHeight();

        // Create a PdfTemplate object based on the size of the image
        PdfTemplate template = new PdfTemplate(width, height);

        // Draw image on the template
        template.getGraphics().drawImage(image, 0, 0, width, height);

        // Create a rubber stamp annotation, specifying its location and position
        Rectangle2D rect = new Rectangle2D.Float((float) (page.getActualSize().getWidth() - width - 50), (float) (page.getActualSize().getHeight() - 400), width, height);
        PdfRubberStampAnnotation stamp = new PdfRubberStampAnnotation(rect);

        // Create a PdfAppearance object
        PdfAppearance pdfAppearance = new PdfAppearance(stamp);

        // Set the template as the normal state of the appearance
        pdfAppearance.setNormal(template);

        // Apply the appearance to the stamp
        stamp.setAppearance(pdfAppearance);

        // Add the stamp annotation to PDF
        page.getAnnotationsWidget().add(stamp);

        // Save the file
        document.saveToFile("output/ImageStamp.pdf");
        document.close();
    }
}

Java: Add Stamps to a PDF Document

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