jpeg图片数据流怎么转png图片数据流

Question

jpeg图片数据流怎么转png图片数据流？？？？？？？？？

Answer 1

试试            ImageIcon ii = new ImageIcon("your file path");
            int w = ii.getIconWidth();
            int h = ii.getIconHeight();            Image image = ii.getImage();
            //image = image.getScaledInstance(w / 1024, h / 768,
            //      Image.SCALE_SMOOTH);            BufferedImage bi = new BufferedImage(img.getWidth(null), img
                    .getHeight(null), BufferedImage.TYPE_INT_RGB);
            Graphics2D g2 = bi.createGraphics();
            g2.drawImage(image, 0, 0, null);
            g2.dispose();
            try
            {
                ImageIO.write(bi, "your file suffix", file);
            }
            catch (IOException e1)
            {
                e1.printStackTrace();
            }

Answer 2

BufferedImage image = new BufferedImage(...);
image.read(InputStream in);
image.write(image,"png",OutputStream out);