By

前言

Github：https://github.com/HealerJean

博客：http://blog.healerjean.com

Java上传图片时，对某些图片进行缩放、裁剪或者生成缩略图时会蒙上一层红色， 经过检查只要经过ImageIO.read()方法读取后再保存，该图片便已经变成红图。 因此，可以推测直接原因在于ImageIO.read()方法加载图片的过程存在问题。

1、解决 :而使用JDK中提供的Image



如果是file
Image src=Toolkit.getDefaultToolkit().getImage(file.getPath());

如果是url
URL url = new URL(wechat_erweimaTmail);
java.awt.Image imageTookittitle = Toolkit.getDefaultToolkit().createImage(url);
BufferedImage titleLab = ImageUtils.toBufferedImage(imageTookittitle);



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;
}

​

ContactAuthor