从URL绘制图像

Question

这是一个pacman游戏,当我从我的电脑导入它时,它运行得很好.但是当我尝试从URL中获取它时,我的游戏开始滞后并且图像不显示.

URL url = new URL("https://www.dropbox.com/s/xpc49t8xpqt8dir/pacman%20down.jpg");
image = ImageIO.read(url);  

G.drawImage(image, x, y, 20,20,null);

图片

(http://i.stack.imgur.com/Cp1XL.png在IMGUR)

Answer 1

https://www.dropbox.com/s/xpc49t8xpqt8dir/pacman%20down.jpg 返回HTML文本而不是图像数据.

这是一个黑客攻击,但请尝试https://www.dropbox.com/s/xpc49t8xpqt8dir/pacman%20down.jpg?dl=1.但是请注意,drop box可能会在将来更改此查询.

public class TestURL02 {

    public static void main(String[] args) {
        new TestURL02();
    }

    public TestURL02() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                }

                JFrame frame = new JFrame();
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());
                frame.add(new PacPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class PacPane extends JPanel {

        private BufferedImage image;

        public PacPane() {
            InputStream is = null;
            try {
                URL url = new URL("https://www.dropbox.com/s/xpc49t8xpqt8dir/pacman%20down.jpg?dl=1");
//                StringBuilder sb = new StringBuilder(1024);
//                byte[] buffer = new byte[1024 * 1024];
//                is = url.openStream();
//                int in = -1;
//                while ((in = is.read(buffer)) != -1) {
//                    sb.append(new String(buffer));
//                }
//                System.out.println(sb.toString());
                image = ImageIO.read(url);
            } catch (IOException exp) {
                exp.printStackTrace();
            } finally {
                try {
                    is.close();
                } catch (Exception e) {
                }
            }
        }

        @Override
        public Dimension getPreferredSize() {
            return image == null ? super.getPreferredSize() : new Dimension(image.getWidth(), image.getHeight());
        }

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            if (image != null) {
                int x = (getWidth() - image.getWidth()) / 2;
                int y = (getHeight() - image.getHeight()) / 2;
                g.drawImage(image, x, y, this);
            }
        }

    }
}