在Java中如何开发图像查看器

import javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.*;
import java.io.File;
import java.io.IOException;

public class ImageViewer {
    private JFrame frame;
    private JLabel label;
    private JLabel statusLabel;

    public ImageViewer() {
        frame = new JFrame("图像查看器");
        label = new JLabel();
        label.setHorizontalAlignment(JLabel.CENTER);
        statusLabel = new JLabel("就绪", SwingConstants.LEFT);

        // 设置滚动面板，支持大图浏览
        JScrollPane scrollPane = new JScrollPane(label);
        frame.add(scrollPane, BorderLayout.CENTER);
        frame.add(statusLabel, BorderLayout.SOUTH);

        createMenu();

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(800, 600);
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

    private void createMenu() {
        JMenuBar menuBar = new JMenuBar();
        JMenu fileMenu = new JMenu("文件");
        JMenuItem openItem = new JMenuItem("打开...");

        openItem.addActionListener(e -> openImage());
        fileMenu.add(openItem);
        menuBar.add(fileMenu);
        frame.setJMenuBar(menuBar);
    }

    private void openImage() {
        JFileChooser chooser = new JFileChooser();
        int result = chooser.showOpenDialog(frame);
        if (result == JFileChooser.APPROVE_OPTION) {
            File file = chooser.getSelectedFile();
            try {
                Image image = ImageIO.read(file);
                ImageIcon icon = new ImageIcon(image);
                label.setIcon(icon);
                statusLabel.setText("文件: " + file.getName() + " | 尺寸: " + image.getWidth(null) + "x" + image.getHeight(null));
                frame.pack(); // 调整窗口大小以适应图像
                if (frame.getWidth() > 800 || frame.getHeight() > 600) {
                    frame.setSize(800, 600);
                }
            } catch (IOException ex) {
                JOptionPane.showMessageDialog(frame, "无法加载图像: " + ex.getMessage(), "错误", JOptionPane.ERROR_MESSAGE);
            }
        }
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(ImageViewer::new);
    }
}

Image scaledImage = image.getScaledInstance(targetWidth, targetHeight, Image.SCALE_SMOOTH);
label.setIcon(new ImageIcon(scaledImage));