Proper backgrounds can make different content elements of PDF documents better matched and improve the visual impression and reading experience of PDF documents. Besides, it's important to add different backgrounds to PDF documents for different usage scenarios to enhance the professionalism of the documents. This article will show how to use Spire.PDF for Java to set the background color and background image for PDF documents.

• Add Background Color to PDF Documents in Java
• Add Background Picture to PDF Documents in Java

Install Spire.PDF for Java

First, you're required to add the Spire.Pdf.jar file as a dependency in your Java program. The JAR file can be downloaded from this link. If you use Maven, you can easily import the JAR file in your application by adding the following code to your project's pom.xml file.

<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>11.11.11</version>
    </dependency>
</dependencies>

Add Background Color to PDF Documents in Java

As setting the background of a PDF document needs to be done page by page, we can loop through all the pages in the document and use the PdfPageBase.setBackgroundColor() method to set the background color for each page. The following are the detailed steps:

• Create an object of PdfDocument.
• Load a PDF document using PdfDocument.loadFromFile() method.
• Loop through the pages in the PDF document and add a background color to each page using PdfPageBase.setBackgroundColor() method. You can also use the PdfPageBase.setBackgroudOpacity() method to set the opacity of the background.
• Save the document using PdfDocument.saveToFile() method.

import com.spire.pdf.PdfDocument;
import com.spire.pdf.PdfPageBase;

import java.awt.*;

public class SetPDFBackgroundColor {
    public static void main(String[] args) {

        //Create an object of PdfDocument
        PdfDocument pdf = new PdfDocument();

        //Load a PDF file
        pdf.loadFromFile("Sample.pdf");

        //Loop through the pages in the PDF file
        for (PdfPageBase page : (Iterable) pdf.getPages()
             ) {
            //Set the background color for each page
            page.setBackgroundColor(Color.PINK);
            //Set the opacity of the background
            page.setBackgroudOpacity(0.2f);
        }

        //Save the PDF file
        pdf.saveToFile("BackgroundColor.pdf");
    }
}

Add Background Picture to PDF Documents in Java

Spire.PDF for Java provides the PdfPageBase.setBackgroundImage() to set a picture as the PDF page background. The detailed steps for adding an image background to a PDF document are as follows:

• Create an object of PdfDocument.
• Load a PDF document using PdfDocument.loadFromFile() method.
• Loop through the pages in the PDF document and add a background picture to each page using PdfPageBase.setBackgroundImage() method. You can also use the PdfPageBase.setBackgroudOpacity() method to set the opacity of the background.
• Save the document using PdfDocument.saveToFile() method.

import com.spire.pdf.PdfDocument;
import com.spire.pdf.PdfPageBase;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

public class SetPDFBackgroundImage {
    public static void main(String[] args) throws IOException {

        //Create an object of PdfDocument
        PdfDocument pdf = new PdfDocument();

        //Load a PDF file
        pdf.loadFromFile("Sample.pdf");

        //Load an image
        BufferedImage background = ImageIO.read(new File("background.jpg"));

        //Loop through the pages in the PDF file
        for (PdfPageBase page : (Iterable) pdf.getPages()
             ) {
            //Set the loaded image as the background image of a page
            page.setBackgroundImage(background);
            //Set the opacity of the background
            page.setBackgroudOpacity(0.2f);
        }

        //Save the PDF file
        pdf.saveToFile("BackgroundImage.pdf");
    }
}

Apply for a Temporary License

If you'd like to remove the evaluation message from the generated documents, or to get rid of the function limitations, please request a 30-day trial license for yourself.

Knowing the number of pages in a PDF helps you understand the length of the document, which is especially useful in scenarios where a large number of PDF documents need to be processed, such as office work, academic research, or legal document management. By getting the PDF page count, you can estimate the time required to process the document, thus rationalizing tasks and increasing efficiency. In this article, you will learn how to get the number of pages in a PDF file in Java using Spire.PDF for Java.

Install Spire.PDF for Java

First of all, you're required to add the Spire.Pdf.jar file as a dependency in your Java program. The JAR file can be downloaded from this link. If you use Maven, you can easily import the JAR file in your application by adding the following code to your project's pom.xml file.

<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>11.11.11</version>
    </dependency>
</dependencies>

Count the Number of Pages in a PDF File in Java

The PdfDocument.getPages().getCount() method provided by Spire.PDF for Java allows to quickly count the number of pages in a PDF file without opening it. The following are the detailed steps.

• Create a PdfDocument object.
• Load a sample PDF file using PdfDocument.loadFromFile() method.
• Count the number of pages in the PDF file using PdfDocument.getPages().getCount() method.
• Print out the result.

import com.spire.pdf.PdfDocument;

public class CountPdfPages {

    public static void main(String[] args) {

        //Create a PdfDocument instance
        PdfDocument pdf = new PdfDocument();

        //Load a PDF file
       pdf.loadFromFile("contract.pdf");

        //Count the number of pages in the PDF file
        int pageCount = pdf.getPages().getCount();

        //Output the result
        System.out.print("The number of pages in the PDF is: " + pageCount);
    }
}

Apply for a Temporary License

If you'd like to remove the evaluation message from the generated documents, or to get rid of the function limitations, please request a 30-day trial license for yourself.