JAVA实现PDF文件与图片的相互转换

    <dependency>
      <groupId>org.apache.pdfbox</groupId>
      <artifactId>pdfbox</artifactId>
      <version>2.0.24</version>
    </dependency>

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;

    private static void pdfToImage(){
        try {
            PDDocument document = PDDocument.load(new File("D:\\Test\\test.pdf"));
            PDFRenderer renderer = new PDFRenderer(document);
            BufferedImage image = renderer.renderImage(0);
            ImageIO.write(image, "png", new File("D:\\Test\\output.png"));
            document.close();
        }catch (Exception e){
            e.printStackTrace();
        }
    }

    <dependency>
      <groupId>com.itextpdf</groupId>
      <artifactId>itextpdf</artifactId>
      <version>5.4.2</version>
    </dependency>

import com.itextpdf.text.Document;
import com.itextpdf.text.Image;
import com.itextpdf.text.pdf.PdfWriter;

    private static void imageToPdf(){
        try {
            Document document = new Document();
            PdfWriter.getInstance(document, new FileOutputStream("D:\\Test\\test2.pdf"));
            document.open();
            Image image = Image.getInstance("D:\\Test\\output.png");
            document.add(image);
            document.close();
        }catch (Exception e){
            e.printStackTrace();
        }
    }