ImageIO.read() 总是旋转我上传的图片 [英] ImageIO.read( ) always rotates my uploaded picture

问题描述

我想创建一个 Web 应用程序，允许用户将他们的图像上传到服务器.当他们点击发送时，他们的图像将被上传到服务器(多部分).在保存之前，我想对图像进行一些操作，所以我决定使用..

I want to create a web application that allow users to upload their image to the server. When they click send, their image will be uploaded to the server (multipart). Before saving, I want to make some operation with the image, so I decided to use ..

ImageIO.read(InputStream)

ImageIO.read(InputStream)

获取BufferedImage对象

to get BufferedImage object

代码如下:

public static BufferedImage getBufferedImageFromMultipartFile(MultipartFile file) 
throws APIException
{
    BufferedImage bi = null;

    try
    {
        bi = ImageIO.read(file.getInputStream());
    }
    catch (IOException e)
    {
        throw new APIException(ErrorCode.SERVER_ERROR, e);
    }

    return bi;
}

问题是当我尝试上传高度大于宽度的图片时，例如3264 x 2448(高 x 宽)，结果始终是旋转后的图像 (2448 x 3264).

The problem is when I try to upload a picture that has height more than width such as 3264 x 2448 (height x width), the result always an image that has been rotated (2448 x 3264).

有没有办法解决这个问题?

Is there any solution to solve this problem ?

这是错误还是任何已定义的 API 规范?

Is this a bug or any defined API specification ?

谢谢.

附注.对不起我的英语 :D

PS. sorry for my english :D

推荐答案

ImageIO.read( ) 无法读取使用移动设备拍摄的图像的方向.

ImageIO.read( ) can't read the orientation of the image if it was taken with mobile device.

我使用元数据提取器读取元数据，我认为这是一个很好的解决方案:github.com/drewnoakes/metadata-extractor/wiki

I used metadata-extractor to read metadata, i think it's a good solution: github.com/drewnoakes/metadata-extractor/wiki

<dependency> 
  <groupId>com.drewnoakes</groupId> 
  <artifactId>metadata-extractor</artifactId> 
  <version>2.7.2</version> 
</dependency>

读取 exif 目录中归档的方向:

Read orientation filed in exif directory:

ExifIFD0Directory exifIFD0 = metadata.getDirectory(ExifIFD0Directory.class);
int orientation = exifIFD0.getInt(ExifIFD0Directory.TAG_ORIENTATION);

switch (orientation) {
  case 1: // [Exif IFD0] Orientation - Top, left side (Horizontal / normal)
    return null;
  case 6: // [Exif IFD0] Orientation - Right side, top (Rotate 90 CW)
    return Rotation.CW_90;
  case 3: // [Exif IFD0] Orientation - Bottom, right side (Rotate 180)
    return Rotation.CW_180;
  case 8: // [Exif IFD0] Orientation - Left side, bottom (Rotate 270 CW)
    return Rotation.CW_270;
}

(Rotation 是 org.imgscalr.Scalr 框架中的一个类，我使用 ti 旋转图像).

(Rotation is a class from the org.imgscalr.Scalr framework I use ti rotate image).

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