java将图片铺满panel_如何让添加的背景图片铺满整个JFrame？

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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);

}

}

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