将背景图像添加到面板 [英] Add an Background image to a Panel

问题描述

我有一个 JPanel，我想添加一个图像作为它的背景.我该怎么做?

I have a JPanel, and i want to add an image as its background. How can i do that ?

frame = new JFrame("Some frame");
panel1 = new JPanel();
panel1.setBorder(new EmptyBorder(5, 5, 5, 5));
// NEED TO ADD AN IMAGE TO THIS PANEL

panel1.setLayout(cardlayout);
frame.getContentPane().add(panel1);

frame.setLocationByPlatform(true);
frame.setVisible(true);

我需要向 panel 添加图像，我该怎么做?

I need to add an image to the panel and how can i do it ?

更新 1

    panel1 = new JPanel()
    {
    private static final long serialVersionUID = 1L;

    @Override
    public void paintComponent(Graphics g)
    {

        g.drawImage(Toolkit.getDefaultToolkit().createImage("1.jpg"), 0, 0, null);
    }
};

推荐答案

您需要重写方法 paintComponent(Graphics g) of JPanel 并使用 drawImage() 在 Graphics 对象 g 如这个例子.

You need to override the method paintComponent(Graphics g) of JPanel and use drawImage() on the Graphics object g as in this example.

另外，通过@trashgod检查这两个示例:

Also, check these two examples by @trashgod:

1. 示例.
2. 示例.

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