Java PDF to Image Conversion Guide

2 years ago
Olivia Parker
2 minutes

There are several methods to convert PDF to images using Java, including utilizing third-party libraries or APIs. Here are some commonly used methods:

One way to accomplish this is by utilizing the Apache PDFBox library, which is a Java library designed to manipulate PDF files. It offers the capability to convert PDFs into images. By incorporating PDFBox into your project using Maven or Gradle, you can then utilize the PDFToImage class to convert PDFs into images.

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.rendering.PDFRenderer;

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

public class PDFToImageConverter {
    public static void main(String[] args) {
        try {
            PDDocument document = PDDocument.load(new File("input.pdf"));
            PDFRenderer renderer = new PDFRenderer(document);
            for (int pageIndex = 0; pageIndex < document.getNumberOfPages(); pageIndex++) {
                BufferedImage image = renderer.renderImageWithDPI(pageIndex, 300); // 设置DPI
                ImageIO.write(image, "PNG", new File("output_" + pageIndex + ".png"));
            }
            document.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

Using the JavaFX library: JavaFX is a graphical user interface toolkit for the Java platform that offers the SceneGraph API, allowing you to load a PDF file into a JavaFX ImageView and then save it as an image.

import javafx.application.Application;
import javafx.embed.swing.SwingFXUtils;
import javafx.scene.Scene;
import javafx.scene.image.WritableImage;
import javafx.scene.image.ImageView;
import javafx.stage.Stage;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.rendering.PDFRenderer;

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

public class PDFToImageConverter extends Application {
    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage primaryStage) {
        try {
            PDDocument document = PDDocument.load(new File("input.pdf"));
            PDFRenderer renderer = new PDFRenderer(document);
            for (int pageIndex = 0; pageIndex < document.getNumberOfPages(); pageIndex++) {
                BufferedImage bufferedImage = renderer.renderImageWithDPI(pageIndex, 300); // 设置DPI
                WritableImage image = SwingFXUtils.toFXImage(bufferedImage, null);
                ImageView imageView = new ImageView(image);
                Scene scene = new Scene(imageView);
                primaryStage.setScene(scene);
                primaryStage.setTitle("Page " + pageIndex);
                primaryStage.show();
                ImageIO.write(bufferedImage, "PNG", new File("output_" + pageIndex + ".png"));
            }
            document.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

This is just an example of two implementation methods, there are other third-party libraries and APIs that can achieve the same functionality, such as using iText, PDFjet, Aspose.PDF, etc. You can choose the method that best suits your needs.

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