我只是做了一个非常简单的示例，该示例基本上试图将滚动窗格保持在所提供图像中间的中心
public class TestZooming { public static void main(String[] args) { new TestZooming(); } public TestZooming() { EventQueue.invokeLater(new Runnable() { @Override public void run() { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (ClassNotFoundException classNotFoundException) { } catch (InstantiationException instantiationException) { } catch (IllegalAccessException illegalAccessException) { } catch (UnsupportedLookAndFeelException unsupportedLookAndFeelException) { } Jframe frame = new Jframe(); frame = new Jframe(); frame.setDefaultCloseOperation(Jframe.EXIT_ON_CLOSE); frame.setSize(400, 400); frame.setLocationRelativeTo(null); frame.setLayout(new BorderLayout()); final ZoomPane pane = new ZoomPane(); frame.add(new JScrollPane(pane)); frame.setVisible(true); SwingUtilities.invokeLater(new Runnable() { @Override public void run() { pane.centerInViewport(); } }); } }); } protected class ZoomPane extends JPanel { private Image background; private Image scaled; private float zoom = 1f; private Dimension scaledSize; private JViewport con; public ZoomPane() { try { background = ImageIO.read(new File("...")); scaled = background; scaledSize = new Dimension(background.getWidth(this), background.getHeight(this)); } catch (IOException ex) { ex.printStackTrace(); } InputMap im = getInputMap(WHEN_IN_FOCUSED_WINDOW); ActionMap am = getActionMap(); im.put(KeyStroke.getKeyStroke(KeyEvent.VK_PLUS, 0), "plus"); im.put(KeyStroke.getKeyStroke(KeyEvent.VK_EQUALS, InputEvent.SHIFT_DOWN_MASK), "plus"); im.put(KeyStroke.getKeyStroke(KeyEvent.VK_MINUS, 0), "minus"); am.put("plus", new AbstractAction() { @Override public void actionPerformed(ActionEvent e) { setZoom(getZoom() + 0.1f); } }); am.put("minus", new AbstractAction() { @Override public void actionPerformed(ActionEvent e) { setZoom(getZoom() - 0.1f); } }); setFocusable(true); requestFocusInWindow(); } @Override public void addNotify() { super.addNotify(); } public float getZoom() { return zoom; } public void setZoom(float value) { if (zoom != value) { zoom = value; if (zoom < 0) { zoom = 0f; } int width = (int) Math.floor(background.getWidth(this) * zoom); int height = (int) Math.floor(background.getHeight(this) * zoom); scaled = background.getScaledInstance(width, height, Image.SCALE_SMOOTH); scaledSize = new Dimension(width, height); if (getParent() instanceof JViewport) { int centerX = width / 2; int centerY = height / 2; JViewport parent = (JViewport) getParent(); Rectangle viewRect = parent.getViewRect(); viewRect.x = centerX - (viewRect.width / 2); viewRect.y = centerY - (viewRect.height / 2); scrollRectToVisible(viewRect); } invalidate(); repaint(); } } @Override public Dimension getPreferredSize() { return scaledSize; } @Override protected void paintComponent(Graphics g) { super.paintComponent(g); if (scaled != null) { g.drawImage(scaled, 0, 0, this); } } protected void centerInViewport() { Container container = getParent(); if (container instanceof JViewport) { JViewport port = (JViewport) container; Rectangle viewRect = port.getViewRect(); int width = getWidth(); int height = getHeight(); viewRect.x = (width - viewRect.width) / 2; viewRect.y = (height - viewRect.height) / 2; scrollRectToVisible(viewRect); } } }}至于你的为什么不起作用，我不能说，我不能运行这个例子，但是也许这至少会给你一些想法…
