手機上傳的圖片翻轉90度問題

網上程式碼整理了下：

public static void main(String[] args) {
    try {
        BufferedImage src = ImageIO.read(new File("XXXX.jpeg"));
        BufferedImage des = RotateImage.Rotate(src, getRotateAngleForPhoto("XXXX.jpeg"));
        ImageIO.write(des,"jpg",new File("C:\\Users\\xu.haifeng\\Desktop\\aaa.jpg"));
    } catch (IOException e) {
        e.printStackTrace();
    }
}

public class RotateImage {
    public static BufferedImage Rotate(Image src, int angel) {
        int src_width = src.getWidth(null);
        int src_height = src.getHeight(null);
        // calculate the new image size
        Rectangle rect_des = CalcRotatedSize(new Rectangle(new Dimension(
                src_width, src_height)), angel);

        BufferedImage res = null;
        res = new BufferedImage(rect_des.width, rect_des.height,
                BufferedImage.TYPE_INT_RGB);
        Graphics2D g2 = res.createGraphics();
        // transform
        g2.translate((rect_des.width - src_width) / 2,
                (rect_des.height - src_height) / 2);
        g2.rotate(Math.toRadians(angel), src_width / 2, src_height / 2);

        g2.drawImage(src, null, null);
        return res;
    }

    public static Rectangle CalcRotatedSize(Rectangle src, int angel) {
        // if angel is greater than 90 degree, we need to do some conversion
        if (angel >= 90) {
            if(angel / 90 % 2 == 1){
                int temp = src.height;
                src.height = src.width;
                src.width = temp;
            }
            angel = angel % 90;
        }

        double r = Math.sqrt(src.height * src.height + src.width * src.width) / 2;
        double len = 2 * Math.sin(Math.toRadians(angel) / 2) * r;
        double angel_alpha = (Math.PI - Math.toRadians(angel)) / 2;
        double angel_dalta_width = Math.atan((double) src.height / src.width);
        double angel_dalta_height = Math.atan((double) src.width / src.height);

        int len_dalta_width = (int) (len * Math.cos(Math.PI - angel_alpha
                - angel_dalta_width));
        int len_dalta_height = (int) (len * Math.cos(Math.PI - angel_alpha
                - angel_dalta_height));
        int des_width = src.width + len_dalta_width * 2;
        int des_height = src.height + len_dalta_height * 2;
        return new Rectangle(new Dimension(des_width, des_height));
    }

public static Rectangle CalcRotatedSize(Rectangle src, int angel) {
    if (angel >= 90) {
        if (angel / 90 % 2 == 1) {
            int temp = src.height;
            src.height = src.width;
            src.width = temp;
        }
        angel = angel % 90;
    }
    double r = Math.sqrt(src.height * src.height + src.width * src.width) / 2;
    double len = 2 * Math.sin(Math.toRadians(angel) / 2) * r;
    double angel_alpha = (Math.PI - Math.toRadians(angel)) / 2;
    double angel_dalta_width = Math.atan((double) src.height / src.width);
    double angel_dalta_height = Math.atan((double) src.width / src.height);
    int len_dalta_width = (int) (len * Math.cos(Math.PI - angel_alpha
            - angel_dalta_width));
    int len_dalta_height = (int) (len * Math.cos(Math.PI - angel_alpha
            - angel_dalta_height));
    int des_width = src.width + len_dalta_width * 2;
    int des_height = src.height + len_dalta_height * 2;
    return new Rectangle(new Dimension(des_width, des_height));
}

public static int getRotateAngleForPhoto(String filePath) {

    File file = new File(filePath);

    int angle = 0;

    Metadata metadata;
    try {
        metadata = JpegMetadataReader.readMetadata(file);
        Directory directory = metadata.getDirectory(ExifDirectory.class);
        if (directory.containsTag(ExifDirectory.TAG_ORIENTATION)) {

            // Exif資訊中方向　　
            int orientation = directory.getInt(ExifDirectory.TAG_ORIENTATION);

            // 原圖片的方向資訊
            if (6 == orientation) {
                //6旋轉90
                angle = 90;
            } else if (3 == orientation) {
                //3旋轉180
                angle = 180;
            } else if (8 == orientation) {
                //8旋轉90
                angle = 270;
            }
        }
    } catch (JpegProcessingException e) {
        e.printStackTrace();
    } catch (MetadataException e) {
        e.printStackTrace();
    }

    return angle;
}

}

需要

mediautil-1.0.jar

metadata-extractor-2.3.1.jar