JPanel面板中设置背景图片

自定义JPanel类：

import java.awt.Graphics;import javax.swing.ImageIcon;import javax.swing.JPanel;public class BackgroundPanel extends JPanel {public BackgroundPanel() {}public void paintComponent(Graphics g) {int x = 0, y = 0;java.net.URL imgURL = getClass().getResource("/pic/login.jpg");// /pic/login.jpg是测试图片，与BackgroundPanel.java放在同一目录下ImageIcon icon = new ImageIcon(imgURL);g.drawImage(icon.getImage(), x, y, getSize().width, getSize().height,this);while (true) {g.drawImage(icon.getImage(), x, y, this);if (x > getSize().width && y > getSize().height)break;// 这段代码是为了保证在窗口大于图片时，图片仍能覆盖整个窗口if (x > getSize().width) {x = 0;y += icon.getIconHeight();} elsex += icon.getIconWidth();}}}

 

 

最后在窗体中引用：

login_panel = new BackgroundPanel();