代码中GraphicsUtilities这个类不是jdk自带的.改了下:public static void main(String[] args) throws IOException {

URL resource = ImageSwing.class.getResource("./Kitty_xs013.gif");

BufferedImage sourceImage = ImageIO.read(resource);

BufferedImage dstImage = null;

AffineTransform transform = AffineTransform.getScaleInstance(0.5, 0.5);// 返回表示缩放变换的变换

AffineTransformOp op = new AffineTransformOp(transform, AffineTransformOp.TYPE_BILINEAR);

dstImage = op.filter(sourceImage, null);

/********** save到本地 *****************/

try {

ImageIO.write(dstImage, "png", new File("D:\\a.gif"));

} catch (IOException e) {

e.printStackTrace();

}

/********** save end *****************/

JTabbedPane tabbedPane = new JTabbedPane();

tabbedPane.add("Source Transform", new JLabel(new ImageIcon(sourceImage)));

tabbedPane.add("Affine Transform", new JLabel(new ImageIcon(dstImage)));

JFrame jframe = new JFrame();

jframe.setSize(800, 600);

jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

jframe.getContentPane().add(tabbedPane);

jframe.setVisible(true);

}

public static void main(String[] args) throws IOException {

URL resource = ImageSwing.class.getResource("./Kitty_xs013.gif");

BufferedImage sourceImage = ImageIO.read(resource);

BufferedImage dstImage = null;

AffineTransform transform = AffineTransform.getScaleInstance(0.5, 0.5);// 返回表示缩放变换的变换

AffineTransformOp op = new AffineTransformOp(transform, AffineTransformOp.TYPE_BILINEAR);

dstImage = op.filter(sourceImage, null);

/********** save到本地 *****************/

try {

ImageIO.write(dstImage, "png", new File("D:\\a.gif"));

} catch (IOException e) {

e.printStackTrace();

}

/********** save end *****************/

JTabbedPane tabbedPane = new JTabbedPane();

tabbedPane.add("Source Transform", new JLabel(new ImageIcon(sourceImage)));

tabbedPane.add("Affine Transform", new JLabel(new ImageIcon(dstImage)));

JFrame jframe = new JFrame();

jframe.setSize(800, 600);

jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

jframe.getContentPane().add(tabbedPane);

jframe.setVisible(true);

}

试了下, 在save代码块中, 如果用

ImageIO.write(dstImage, "gif", new File("D:\\a.gif"));的确是黑色背景的, 但是如果用

ImageIO.write(dstImage, "png", new File("D:\\a.gif"));

就是透明的了, 也就是说存的时候始终存成png的格式

2009年2月18日 13:30