java 如何在panel上显示一张png图片

Question

如题 有源码最好 求指点！！！

Answer 1

/**
 * Panel背景图片
 * @version 2012-2-25
 */
public class BackgroundImage4Panel extends javax.swing.JFrame {
    /**
     * serialVersionId
     */
    private static final long serialVersionUID = 1L;    /** Creates new form NewJFrame */
    public BackgroundImage4Panel() {
        getContentPane().add(new JPanel() {
            /**
             * serialVersionId
             */
            private static final long serialVersionUID = -1183754274585001429L;            protected void paintComponent(Graphics g) {
                super.paintComponent(g);
                try {
                    g.drawImage(ImageIO.read(new File("C:\\image.png")), 0, 0, null);
                } catch (IOException e) {
                    e.printStackTrace();
                }
                g.drawString("HelloWorld", 20, 20);
            }
        });
        setSize(800, 600);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }    /**
     * 测试入口
     * @param args 参数列表
     */
    public static void main(String[] args) {
        new BackgroundImage4Panel().setVisible(true);
    }
}

Answer 2

看这里 - > http://blog.csdn.net/jia20003/article/details/7279667
重写paintComponent()方法即可

Answer 3

Panel panel = new Panel() {
   public void paint(Graphics g) {
      g.drawImage(new ImageIcon("图片路径").getImage(), 0, 0, this);
   }
};