以JPanel为基础实现一个图像框

代码：

import java.awt.Graphics;

import javax.swing.ImageIcon;
import javax.swing.JPanel;

public class Picture extends JPanel {
    private static final long serialVersionUID = -4437881316229152596L;

    private ImageIcon icon;

    public Picture(java.net.URL imgURL) {
        icon = new ImageIcon(imgURL);
    }

    public void paintComponent(Graphics g) {
        int x = 0, y = 0;

        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;
            }

            if (x > getSize().width) {
                x = 0;
                y += icon.getIconHeight();
            } else{
                x += icon.getIconWidth();
            }
        }
    }
}

使用实例：

Picture picture=new Picture(getClass().getResource("/welcome.jpg"));

效果图：