Java Swing：为JMenuBar（JToolBar）设置背景图片

最近在搞Java Swing图形界面编程，想要为JMenuBar和JToolBar设置背景图片，在网上找了半天，硬是没找着。于是自己试着写了一下，居然成功了，拿出来跟需要的小伙伴们分享一下，代码如下，主要是重写了paintComponent(Graphics g)：

import java.awt.Graphics;

import java.awt.Image;
import javax.swing.ImageIcon;
import javax.swing.JMenuBar;

public class MyMenuBar extends JMenuBar{
    private ImageIcon backgroundImage;
    @override
protected void paintComponent(Graphics g){
super.paintComponent(g);
if(backgroundImage != null){
backgroundImage.setImage(background.getImage().getScaledInstance(this.getWidth(), this.getHeight(), Image.SCALE_FAST));
backgroundImage.paintIcon(this, g, 0, 0);
}
}
public void setBackgroundImage(String img){
this.backgroundImage = new ImageIcon(img);
this.repaint();
}
public void setBackgroundImage(ImageIcon icon){
this.backgroundImage = icon;
this.repaint();
}

}

调 用很简单：

public static void main(String[] args){

JFrame frame = new JFrame();

MyMenuBar menuBar = new MyMenuBar();

menuBar.setBackgroundImage("image/test.gif");

frame.setJMenuBar(menuBar);

frame.setVisible(true);

}