将图像添加到JPanel背景

Question

如何将图像添加到JPanel背景。图像不会被缩放或调整大小。谢谢。

Answer 1

您可以覆盖这些方法之一：

JComponent.paint(Graphics g) 
JComponent.paintComponent(Graphics g) 

Answer 2

/** 
* @author 
* 
*/ 
public class ImagePanel extends JPanel { 

    private Image image = null; 

    public ImagePanel(String filename) { 
     this.image = new ImageIcon(filename).getImage(); 
    } 

    @Override 
    protected void paintComponent(Graphics g) { 
     super.paintComponent(g); 
     g.drawImage(image, 0, 0, image.getWidth(null), image.getHeight(null), null); 
    } 

    /** 
    * @param args 
    */ 
    public static void main(String[] args) { 
     ImagePanel panel = new ImagePanel("resources/image.jpg"); 

     JFrame frame = new JFrame("Frame"); 
     frame.setSize(800, 600); 
     frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); 
     frame.getContentPane().add(panel, BorderLayout.CENTER); 
     frame.setVisible(true); 
    } 
}