在JFrame例如，下面的代码被添加

//自己的JPanel

DrawPanel drawPanel = new DrawPanel(list, width, height, start, end);

// 必需要有大小

drawPanel.setSize(width, height);



BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

Graphics2D g2 = image.createGraphics();

drawPanel.paint(g2);

try {

ImageIO.write(image, "jpeg", new File("jpanel.jpg"));

} catch (IOException e) {

e.printStackTrace();

}