java图片上传出现红色背景
java图片服务器上传图片都很正常，唯独上传png图片时，png图片变成红色背景
原因是读取上传数据时用的是ImageIO.read(inputstream)方法
public static BufferedImage getImages(byte[] data) throws IOException {
ByteArrayInputStream input = new ByteArrayInputStream(data);
return ImageIO.read(input);
}
解决办法是：换成jdk中的Toolkit来读取上传的数据
Image src=Toolkit.getDefaultToolkit().getImage(file.getPath());
BufferedImage image=BufferedImageBuilder.toBufferedImage(src); //Image to BufferedImage
或：
Image imageTookit = Toolkit.getDefaultToolkit().createImage(bytes);
BufferedImage cutImage = toBufferedImage(imageTookit);
toBufferedImage()：
public static BufferedImage toBufferedImage(Image image) {
if (image instanceof BufferedImage) {
return (BufferedImage) image;
}
// This code ensures that all the pixels in the image are loaded
image = new ImageIcon(image).getImage();
BufferedImage bimage = null;
GraphicsEnvironment ge = GraphicsEnvironment
.getLocalGraphicsEnvironment();
try {
int transparency = Transparency.OPAQUE;
GraphicsDevice gs = ge.getDefaultScreenDevice();
GraphicsConfiguration gc = gs.getDefaultConfiguration();
bimage = gc.createCompatibleImage(image.getWidth(null),
image.getHeight(null), transparency);
} catch (HeadlessException e) {
// The system does not have a screen
}
if (bimage == null) {
// Create a buffered image using the default color model
int type = BufferedImage.TYPE_INT_RGB;
bimage = new BufferedImage(image.getWidth(null),
image.getHeight(null), type);
}
// Copy image to buffered image
Graphics g = bimage.createGraphics();
// Paint the image onto the buffered image
g.drawImage(image, 0, 0, null);
g.dispose();
return bimage;
}
