JButton with background Image changing on mouse hover

JButton with background Image changing on mouse hover

I'm trying to display an JButton with an image on it, but I can't figure
out how to get Mousehover work on this. The normal display of the image is
working, tough. Also it would be nice, if the text drawn on the button
could be centered.
import java.awt.*;
import java.io.IOException;
import java.net.URL;
import javax.imageio.ImageIO;
import javax.swing.JButton;
import javax.swing.JFrame;
public class ImageButtonTest {
private static JButton imageButton;
public static void main(String[] args) throws IOException {
JFrame frm = new JFrame();
frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frm.setSize(90, 27);
frm.setLocation(50, 50);
Image image = ImageIO.read(new
URL("http://i.imgur.com/bitgM6l.png"));
Image imageHover = ImageIO.read(new
URL("http://i.imgur.com/dt81BWk.png"));
imageButton = new ImageButton(image, imageHover);
imageButton.setText("Download");
frm.add(imageButton);
frm.pack();
frm.setVisible(true);
}
static class ImageButton extends JButton {
private Image image, imageHover;
private boolean hover;
ImageButton(Image image, Image imageHover) {
this.image = image;
this.hover = false;
addMouseListener(new java.awt.event.MouseAdapter() {
@Override
public void mouseEntered(java.awt.event.MouseEvent evt) {
hover = true;
repaint();
}
@Override
public void mouseExited(java.awt.event.MouseEvent evt) {
hover = false;
repaint();
}
});
};
@Override
protected void paintComponent(Graphics g) {
if(isEnabled()) {
Graphics2D g2 = (Graphics2D) g.create();
g2.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING,
RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
g2.setFont(new Font("Arial", Font.PLAIN, 12));
g2.setColor(Color.WHITE);
if(hover) {
g2.drawImage(imageHover, 0, 0, getWidth(),
getHeight(), this);
} else {
g2.drawImage(image, 0, 0, getWidth(), getHeight(), this);
}
g2.drawString(getText(), 20, getHeight() / 2 + 5);
g2.dispose();
} else {
super.paintComponent(g);
}
}
}
}