我有一个从png文件创建的BufferedImage.创建它时,我将类型设置为TYPE_INT_ARGB,这应该为我提供透明图像.当我在JPanel中使用paintComponent绘制图像时,得到的图像带有黑色背景.我真的需要使它透明,以便任何帮助将是有用的.这是为了清楚起见的代码：

public class ImagePanel extends JPanel {      

    private static final long serialVersionUID = 1L;
    private BufferedImage image; 

    public ImagePanel() {
        this.image = null;
    }


    public void createImage(String fileName) {
        this.image = ImageUtilities.getBufferedImage(fileName, this);
        this.repaint();

     }

    public void paint(Graphics g) {
        g.drawImage(this.image, 0, 0, this);
    }
}

这是我如何加载图像：

public class ImageUtilities {

/** Create Image from a file, then turn that into a BufferedImage.
*/

   public static BufferedImage getBufferedImage(String imageFile, Component c) {
       Image image = c.getToolkit().getImage(imageFile);
       waitForImage(image, c);
       BufferedImage bufferedImage = new BufferedImage(image.getWidth(c), image.getHeight(c),
                    BufferedImage.TYPE_INT_ARGB);
       Graphics2D g2d = bufferedImage.createGraphics();
       g2d.drawImage(image, 0, 0, c);
       return(bufferedImage);
   }

最后要添加的是,此ImagePanel在另一面板内,如果有任何意义的话.

解决方法:

不知道这是否可以解决您的问题,但是：

>覆盖paintComponent而不是paint(http://download.oracle.com/javase/tutorial/uiswing/painting/closer.html)
>考虑使用较新的javax.imageio API
>确保面板不是不透明的(opaque = false)