我正在尝试将java中的图像另存为pdf

Question

Here are my imports: 
package semestralka;

import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.print.PageFormat;
import java.awt.print.Printable;
import java.awt.print.PrinterException;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;
import java.io.File;
import java.io.IOException;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDPageContentStream;
import org.apache.pdfbox.pdmodel.graphics.image.LosslessFactory;
import org.apache.pdfbox.pdmodel.graphics.image.PDImageXObject;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JPanel;

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDPageContentStream;
import org.apache.pdfbox.pdmodel.graphics.image.LosslessFactory;
import org.apache.pdfbox.pdmodel.graphics.image.PDImageXObject;
    public void save(String format, String imageSaveName) {
//        BufferedImage finalCard = new BufferedImage(CARD_WIDTH, CARD_HEIGHT, BufferedImage.TYPE_INT_RGB);
//        Graphics2D img = (Graphics2D) finalCard.getGraphics();
//        paint(img);
        
        BufferedImage panelImage = new BufferedImage(getWidth(), getHeight(), BufferedImage.TYPE_INT_RGB);
        Graphics2D panelGraphics = panelImage.createGraphics();

        paint(panelGraphics);

        BufferedImage finalCard = new BufferedImage(CARD_WIDTH, CARD_HEIGHT, BufferedImage.TYPE_INT_RGB);
        Graphics2D img = finalCard.createGraphics();

        img.drawImage(panelImage, 0, 0, null);
        
        if (format.equals("pdf")) {
            System.out.println(format);
            try{
                PDDocument doc = new PDDocument();
                PDPage page = new PDPage();
                doc.addPage(page);

                PDPageContentStream contentStream = new PDPageContentStream(doc, page);

                PDImageXObject pdImage = LosslessFactory.createFromImage(doc, finalCard);

                contentStream.drawImage(pdImage, 300, 300, CARD_WIDTH, CARD_HEIGHT);

                contentStream.close();

                File file = new File(imageSaveName + "." + format);
                doc.save(file);
                doc.close();
                System.out.println("PDF saved successfully");
            } catch (IOException e) {
                e.printStackTrace();
            }
        } else {
            //img.drawImage(icon, CARD_WIDTH - QRSize, CARD_HEIGHT / 8, QRSize, QRSize, this);

            File file = new File(imageSaveName + "." + format);
            try {
                ImageIO.write(finalCard, format, file);
                System.out.println("Image saved successfully");
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    And here is an error that I'm getting: Exception in thread "AWT-EventQueue-0" java.lang.NoClassDefFoundError: org/apache/pdfbox/pdmodel/PDDocument
    at semestralka.DesignPanel.save(DesignPanel.java:160)
    at semestralka.Card$12.actionPerformed(Card.java:739)
    at java.desktop/javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1972)
    at java.desktop/javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2314)
    at java.desktop/javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:407)
    at java.desktop/javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:262)
    at java.desktop/javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:279)
    at java.desktop/java.awt.Component.processMouseEvent(Component.java:6620)
    at java.desktop/javax.swing.JComponent.processMouseEvent(JComponent.java:3398)
    at java.desktop/java.awt.Component.processEvent(Component.java:6385)
    at java.desktop/java.awt.Container.processEvent(Container.java:2266)
    at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:4995)
    at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2324)
    at java.desktop/java.awt.Component.dispatchEvent(Component.java:4827)
    at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4948)
    at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Container.java:4575)
    at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Container.java:4516)
    at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2310)
    at java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2780)
    at java.desktop/java.awt.Component.dispatchEvent(Component.java:4827)
    at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:775)
    at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:720)
    at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:714)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:400)
    at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)
    at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:98)
    at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:747)
    at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:745)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:400)
    at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)
    at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:744)
    at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
    at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
    at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
    at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
    at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
    at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
Caused by: java.lang.ClassNotFoundException: org.apache.pdfbox.pdmodel.PDDocument
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641)
    at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188)
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
    ... 37 more

所以我试图将图像保存为pdf，但我的导入似乎存在问题，但我找不到任何解决方案，我像往常一样导入了这些罐子，我将它们全部放在同一个文件中，所以应该有'不是找不到文件或smt，安装时我还关注了youtube视频，如果有人可以帮助我将非常感激

如果需要任何其他信息，请告诉我，如果可能的话，我会尽力提供

Answer 1

您正在使用两个版本的 pdfbox 库，这会导致 java 抛出 NoClassDefFoundError，因为类路径中有两个具有相同包和名称的类。

删除其中一个版本即可解决。

建议使用 Maven 或 Gradle 等构建系统来管理依赖关系并避免此类错误。