Java-ImageIO.write(image, "jpg", iamgeOut)输出的图片失真

Question

ImageIO.write(image, "jpg", iamgeOut)输出的图片会失真，ImageIO.write(image, "png", iamgeOut)则不会，原因何在？
是因为jpg的格式会压缩，而png不会吗？

Answer 1

原因:图片本身的问题(ICC丢失或不全)
链接:http://blog.csdn.net/shixing_11/article/details/6897871

public static BufferedImage toBufferedImage(File img) throws IOException {
Image image = Toolkit.getDefaultToolkit().getImage(img.getPath());
BufferedImage bimage = null;
if (image instanceof BufferedImage) {
return (BufferedImage) image;
}
image = new ImageIcon(image).getImage();
int width = image.getWidth(null);
int height = image.getHeight(null);
if (width < 0 || height < 0) {
/*Map<String,Integer> map = getImageSize(img);
width = map.get(IMAGE_WIDTH);
height = map.get(IMAGE_HEIGHT);*/
return null;
}
GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
try {
int transparency = Transparency.OPAQUE;
GraphicsDevice gs = ge.getDefaultScreenDevice();
GraphicsConfiguration gc = gs.getDefaultConfiguration();
bimage = gc.createCompatibleImage(width, height, transparency);
} catch (HeadlessException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}

if (bimage == null) {
int type = BufferedImage.TYPE_INT_RGB;
bimage = new BufferedImage(image.getWidth(null), image.getHeight(null), type);
}
Graphics g = bimage.createGraphics();
g.drawImage(image, 0, 0, null);
g.dispose();
return bimage;
}

Answer 2

在dispose()之后不要return了，直接打印出来

ServletOutputStream responseOutputStream = response.getOutputStream();
// 输出图象到页面
ImageIO.write(image, "JPEG", responseOutputStream);
out.clear();
out = pageContext.pushBody();