java圖片上傳出現紅色背景

java圖片服務器上傳圖片都很正常，唯獨上傳png圖片時，png圖片變成紅色背景

原因是讀取上傳數據時用的是ImageIO.read(inputstream)方法

public static BufferedImage getImages(byte[] data) throws IOException {

ByteArrayInputStream input = new ByteArrayInputStream(data);

return ImageIO.read(input);

}

解決辦法是：換成jdk中的Toolkit來讀取上傳的數據

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;

}

總結

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