JFrame添加背景图片

import java.awt.event.*;
import javax.swing.*;
import java.awt.*;
public class BackgroundImage extends JFrame
{
JScrollPane scrollPane;
ImageIcon icon;
Image image;
public BackgroundImage()
{
icon = new ImageIcon("bgpanel.jpg");
JPanel panel = new JPanel()
{
protected void paintComponent(Graphics g)
{
// Dispaly image at at full size
g.drawImage(icon.getImage(), 0, 0, null);
// Scale image to size of component
// Dimension d = getSize();
// g.drawImage(icon.getImage(), 0, 0, d.width, d.height, null);
// Fix the image position in the scroll pane
// Point p = scrollPane.getViewport().getViewPosition();
// g.drawImage(icon.getImage(), p.x, p.y, null);
super.paintComponent(g);
}
};
panel.setOpaque( false );
panel.setPreferredSize( new Dimension(400, 400) );
scrollPane = new JScrollPane( panel );
getContentPane().add( scrollPane );
JButton button = new JButton( "Hello" );
panel.add( button );
}
public static void main(String [] args)
{
BackgroundImage frame = new BackgroundImage();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(300, 300);
frame.setLocationRelativeTo( null );
frame.setVisible(true);
}
}