如何把Swing组件上的显示画面保存成一个图象image对象

Question

rt

Answer 1

用JPanel的paint(Graphics g)方法
BufferedImage im = new BufferedImage(pane.getWidth(), pane.getHeight(), BufferedImage.TYPE_INT_RGB);
Graphics g = im.getGraphics();
pane.paint(g);还有一个办法是抓屏幕

Answer 2

public static boolean saveToJPEG(Component comp) {
        boolean result = true;
        try {
            int w = comp.getWidth();
            int h = comp.getHeight();
            BufferedImage
                image = (BufferedImage) comp.createImage(w, h);
            Graphics2D g2 = image.createGraphics();
            comp.print(g2);            String filename = FileChooser.getSaveFileName(comp,"*.jpg");
            if(filename==null)return false;
            BufferedOutputStream bos =
                new BufferedOutputStream(new FileOutputStream(filename));
            com.sun.image.codec.jpeg.JPEGImageEncoder encoder = com.sun.image.codec.jpeg.JPEGCodec.createJPEGEncoder(bos);
            com.sun.image.codec.jpeg.JPEGEncodeParam jep = encoder.getDefaultJPEGEncodeParam(image);
            jep.setQuality(1.0f, false);
            encoder.setJPEGEncodeParam(jep);
            encoder.encode(image);
            bos.close();
        }
        catch (Exception e) {
            result = false;
            e.printStackTrace();
        }
        return result;
    }