//先把图片画在BufferedImage上 再输出BufferedImage
BufferedImage bufferedImage=new BufferedImage(image.getWith(),image.getHeight(),BufferedImage.TYPE_4BYTE_ABGR);
Graphics g=bufferedImage.getGraphics();
g.drawImage(image,0,0,image.getWidth,image.getHeight,null);

ImageIO.write(bufferedImage,"jpg",new File("c:/image.jpg"));