给面板添加背景图片

给JPanel添加背景图片:

代码入下:

 1 package test;

 2 

 3 import java.awt.Graphics;

 4 import java.awt.Image;

 5 

 6 import javax.swing.ImageIcon;

 7 import javax.swing.JPanel;

 8 

 9 public class BackgroundPanel extends JPanel {

10     private int width;

11     private int height;

12     private Image img;

13     

14     public BackgroundPanel(String imgPath, int width, int height) {

15         this(new ImageIcon(imgPath).getImage(), width, height);

16     }

17     

18     public BackgroundPanel(Image img, int width, int height) {

19         this.width = width;

20         this.height = height;

21         this.img = img;

22     }

23     

24     public void paint(Graphics g) {

25         g.drawImage(img, 0, 0, width, height, null);

26     }

27     

28 }

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测试代码:

 

 1 package test;

 2 

 3 import javax.swing.JFrame;

 4 import javax.swing.JPanel;

 5 

 6 public class Test {

 7     public static void main(String[] args) {

 8         final int WIDTH = 600;

 9         final int HEIGHT = 600;

10         JFrame frame = new JFrame("测试背景面板");

11         JPanel panel = new BackgroundPanel("imgPath", WIDTH, HEIGHT);

12         frame.add(panel);

13         frame.setSize(WIDTH, HEIGHT);

14         frame.setVisible(true);

15         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

16     }

17 }

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