使用Java在桌面应用程序中打开PDF

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.IOException;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.filechooser.FileNameExtensionFilter;
import org.icepdf.ri.common.ComponentKeyBinding;
import org.icepdf.ri.common.SwingController;
import org.icepdf.ri.common.SwingViewBuilder;

public class PDFViewer {
    public static void main(String[] args) {
        JFrame frame = new JFrame("PDF Viewer");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(800, 600);

        JPanel panel = new JPanel(new BorderLayout());

        JTextArea textArea = new JTextArea();
        textArea.setEditable(false);
        JScrollPane scrollPane = new JScrollPane(textArea);
        panel.add(scrollPane, BorderLayout.CENTER);

        JButton openButton = new JButton("Open PDF");
        openButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                JFileChooser fileChooser = new JFileChooser();
                fileChooser.setFileFilter(new FileNameExtensionFilter("PDF Files", "pdf"));
                int result = fileChooser.showOpenDialog(frame);
                if (result == JFileChooser.APPROVE_OPTION) {
                    File file = fileChooser.getSelectedFile();
                    try {
                        SwingController controller = new SwingController();
                        SwingViewBuilder factory = new SwingViewBuilder(controller);
                        JPanel viewer = factory.buildViewerPanel();
                        controller.getDocumentViewController().setAnnotationCallback(new org.icepdf.ri.common.MyAnnotationCallback(controller.getDocumentViewController()));
                        controller.getDocumentViewController().setCursorToolManager(new org.icepdf.ri.common.MyCursorToolManager(controller));
                        controller.getDocumentViewController().setPageViewDecorator(new org.icepdf.ri.common.MyPageViewDecorator(controller.getDocumentViewController()));
                        controller.getDocumentViewController().setDocumentLoader(new org.icepdf.ri.common.MyDocumentLoader(controller.getDocumentViewController()));
                        controller.setComponentKeyBinding(new ComponentKeyBinding(controller));
                        controller.openDocument(file.getAbsolutePath());
                        panel.removeAll();
                        panel.add(viewer, BorderLayout.CENTER);
                        panel.revalidate();
                    } catch (Exception ex) {
                        JOptionPane.showMessageDialog(frame, "Error opening PDF: " + ex.getMessage());
                    }
                }
            }
        });
        panel.add(openButton, BorderLayout.NORTH);

        frame.setContentPane(panel);
        frame.setVisible(true);
    }
}

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.IOException;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.filechooser.FileNameExtensionFilter;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.rendering.PDFRenderer;
import org.icepdf.ri.common.ComponentKeyBinding;
import org.icepdf.ri.common.SwingController;
import org.icepdf.ri.common.SwingViewBuilder;

public class PDFViewer {
    public static void main(String[] args) {
        JFrame frame = new JFrame("PDF Viewer");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(800, 600);

        JPanel panel = new JPanel();

        JTextArea textArea = new JTextArea();
        textArea.setEditable(false);
        JScrollPane scrollPane = new JScrollPane(textArea);
        panel.add(scrollPane);

        JButton openButton = new JButton("Open PDF");
        openButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                JFileChooser fileChooser = new JFileChooser();
                fileChooser.setFileFilter(new FileNameExtensionFilter("PDF Files", "pdf"));
                int result = fileChooser.showOpenDialog(frame);
                if (result == JFileChooser.APPROVE_OPTION) {
                    File file = fileChooser.getSelectedFile();
                    try {
                        PDDocument document = PDDocument.load(file);
                        PDFRenderer renderer = new PDFRenderer(document);
                        SwingController controller = new SwingController();
                        SwingViewBuilder factory = new SwingViewBuilder(controller);
                        JPanel viewer = factory.buildViewerPanel();
                        controller.getDocumentViewController().setAnnotationCallback(new org.icepdf.ri.common.MyAnnotationCallback(controller.getDocumentViewController()));
                        controller.getDocumentViewController().setCursorToolManager(new org.icepdf.ri.common.MyCursorToolManager(controller));
                        controller.getDocumentViewController().setPageViewDecorator(new org.icepdf.ri.common.MyPageViewDecorator(controller.getDocumentViewController()));
                        controller.getDocumentViewController().setDocumentLoader(new org.icepdf.ri.common.MyDocumentLoader(controller.getDocumentViewController()));
                        controller.setComponentKeyBinding(new ComponentKeyBinding(controller));
                        controller.openDocument(file.getAbsolutePath());
                        panel.removeAll();
                        panel.add(viewer);
                        panel.revalidate();
                    } catch (IOException ex) {
                        JOptionPane.showMessageDialog(frame, "Error opening PDF: " + ex.getMessage());
                    }
                }
            }
        });
        panel.add(openButton);

        frame.setContentPane(panel);
        frame.setVisible(true);
    }
}