你怎么拉伸图片的,你取出数据,修改,改完了再给放回去就可以了啊。
BufferedImage originalImage = 你的原图片
int width = 宽度;
int height = 高度;
BufferedImage newImage = new BufferedImage(width,height,originalImage.getType());
Graphics g = newImage.getGraphics();
g.drawImage(originalImage, 0,0,width,height,null);
g.dispose();
originalImage = newImage;