以下是一个简单的图片浏览器示例代码,它包含了图片放大缩小、拖拽、上一张/下一张查看等功能。你可以根据它进行扩展,提高用户体验。
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.BorderFactory;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JSlider;
import javax.swing.SwingConstants;
import javax.swing.UIManager;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
public class ImageViewer extends JFrame {
private static final long serialVersionUID = 1L;
private JLabel imageLabel;
private JScrollPane scrollPane;
private BufferedImage image;
private Dimension imageSize;
private JPanel controlPanel;
private JSlider zoomSlider;
private JButton previousButton;
private JButton nextButton;
private int currentImageIndex = 0;
private String[] imagePaths = {"image1.jpg", "image2.jpg", "image3.jpg"};
private int zoomLevel = 100; // Default zoom level
public ImageViewer() {
setTitle("Image Viewer");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setPreferredSize(new Dimension(800, 600));
setLayout(new BorderLayout());
// Create image label and scroll pane
imageLabel = new JLabel();
imageLabel.setHorizontalAlignment(SwingConstants.CENTER);
scrollPane = new JScrollPane(imageLabel);
add(scrollPane, BorderLayout.CENTER);
// Create control panel
controlPanel = new JPanel();
controlPanel.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
add(controlPanel, BorderLayout.SOUTH);
// Create zoom slider
zoomSlider = new JSlider(SwingConstants.HORIZONTAL, 50, 200, zoomLevel);
zoomSlider.setMajorTickSpacing(50);
zoomSlider.setMinorTickSpacing(10);
zoomSlider.setPaintTicks(true);
zoomSlider.setPaintLabels(true);
zoomSlider.addChangeListener(new ChangeListener() {
public void stateChanged(ChangeEvent e) {
zoomLevel = zoomSlider.getValue();
updateImage();
}
});
controlPanel.add(zoomSlider);
// Create previous button
previousButton = new JButton("Previous");
previousButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (currentImageIndex > 0) {
currentImageIndex--;
loadImage();
}
}
});
controlPanel.add(previousButton);
// Create next button
nextButton = new JButton("Next");
nextButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (currentImageIndex < imagePaths.length - 1) {
currentImageIndex++;
loadImage();
}
}
});
controlPanel.add(nextButton);
// Load the first image
loadImage();
// Add mouse listeners to enable dragging
imageLabel.addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent e) {
imageLabel.setCursor(new java.awt.Cursor(java.awt.Cursor.MOVE_CURSOR));
}
public void mouseReleased(MouseEvent e) {
imageLabel.setCursor(new java.awt.Cursor(java.awt.Cursor.DEFAULT_CURSOR));
}
});
imageLabel.addMouseMotionListener(new MouseMotionAdapter() {
public void mouseDragged(MouseEvent e) {
int dx = e.getX() - (imageSize.width - scrollPane.getViewport().getWidth()) / 2;
int dy = e.getY() - (imageSize.height - scrollPane.getViewport().getHeight()) / 2;
int newHValue = scrollPane.getHorizontalScrollBar().getValue() - dx;
int newVValue = scrollPane.getVerticalScrollBar().getValue() - dy;
if (newHValue < 0)
newHValue = 0;
if (newVValue < 0)
newVValue = 0;
if (newHValue + scrollPane.getViewport().getWidth() > imageSize.width)
newHValue = imageSize.width - scrollPane.getViewport().getWidth();
if (newVValue + scrollPane.getViewport().getHeight() > imageSize.height)
newVValue = imageSize.height - scrollPane.getViewport().getHeight();
scrollPane.getHorizontalScrollBar().setValue(newHValue);
scrollPane.getVerticalScrollBar().setValue(newVValue);
}
});
pack();
setLocationRelativeTo(null);
setVisible(true);
}
private void loadImage() {
try {
image = ImageIO.read(new File(imagePaths[currentImageIndex]));
imageSize = new Dimension(image.getWidth(), image.getHeight());
updateImage();
} catch (IOException e) {
JOptionPane.showMessageDialog(this, "Error loading image: " + e.getMessage(), "Error", JOptionPane.ERROR_MESSAGE);
}
}
private void updateImage() {
int newWidth = (int) (imageSize.width * zoomLevel / 100.0);
int newHeight = (int) (imageSize.height * zoomLevel / 100.0);
BufferedImage scaledImage = new BufferedImage(newWidth, newHeight, BufferedImage.TYPE_INT_RGB);
scaledImage.getGraphics().drawImage(image, 0, 0, newWidth, newHeight, null);
imageLabel.setIcon(new ImageIcon(scaledImage));
}
public static void main(String[] args) {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception e) {
// Ignore
}
new ImageViewer();
}
}
运行效果如下: