处理图像而不删除其EXIF数据 [英] Manipulate an image without deleting its EXIF data

问题描述

使用的ImageIO，我通常有一个转换图像文件的问题，覆盖后，它将失去其所有的EXIF数据。有没有什么办法preserve它不首先解压缩，缓存，然后重置呢？

Using imageIO, I usually have the problem of transforming an image file, and after overwriting it, it loses all of its EXIF data. Is there any way to preserve it without first extracting it, caching it, and then resetting it?

推荐答案

下面是一个使用ImageIO的，Imgscalr和Apache的commons-成像的组合我的解决方案。可惜的是有它结合读取图像及其元数据，使之成为可能的内存使用量，而没有过多的单一磁带库;改进的欢迎。

Here is my solution using a combination of ImageIO, Imgscalr and Apache commons-imaging. It's a pity there's no single library which combines reading the image with its metadata, making this probably rather excessive on memory usage; Improvements welcome.

import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import javax.imageio.ImageIO;
import org.apache.commons.imaging.ImageReadException;
import org.apache.commons.imaging.ImageWriteException;
import org.apache.commons.imaging.Imaging;
import org.apache.commons.imaging.common.IImageMetadata;
import org.apache.commons.imaging.formats.jpeg.JpegImageMetadata;
import org.apache.commons.imaging.formats.jpeg.exif.ExifRewriter;
import org.apache.commons.imaging.formats.tiff.TiffImageMetadata;
import org.apache.commons.io.IOUtils;
import org.imgscalr.Scalr;


public class ImageData {

    private byte[] imageData;


    public ImageData(InputStream instream) throws IOException {
        imageData  = IOUtils.toByteArray(instream);
        instream.close();
    }


    public synchronized void resize(int maxDimension) throws IOException, ImageReadException, ImageWriteException {
        // Resize the image if necessary
        BufferedImage image = readImage(imageData);
        if (image.getWidth() > maxDimension || image.getHeight() > maxDimension) {

            // Save existing metadata, if any
            TiffImageMetadata metadata = readExifMetadata(imageData);
            imageData = null; // allow immediate GC

            // resize 
            image = Scalr.resize(image, maxDimension);

            // rewrite resized image as byte[]
            byte[] resizedData = writeJPEG(image);
            image = null; // allow immediate GC 

            // Re-code resizedData + metadata to imageData 
            if (metadata != null) {
                this.imageData = writeExifMetadata(metadata, resizedData);
            } else {
                this.imageData = resizedData;
            }
        }
    }

    private TiffImageMetadata readExifMetadata(byte[] jpegData) throws ImageReadException, IOException {
        IImageMetadata imageMetadata = Imaging.getMetadata(jpegData);
        if (imageMetadata == null) {
            return null;
        }
        JpegImageMetadata jpegMetadata = (JpegImageMetadata)imageMetadata;
        TiffImageMetadata exif = jpegMetadata.getExif();
        if (exif == null) {
            return null;
        }
        return exif;
    }


    private byte[] writeExifMetadata(TiffImageMetadata metadata, byte[] jpegData) 
                                throws ImageReadException, ImageWriteException, IOException {
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        new ExifRewriter().updateExifMetadataLossless(jpegData, out, metadata.getOutputSet());
        out.close();
        return out.toByteArray();
    }


    private BufferedImage readImage(byte[] data) throws IOException {
        return ImageIO.read(new ByteArrayInputStream(data));
    }

    private byte[] writeJPEG(BufferedImage image) throws IOException {
        ByteArrayOutputStream jpegOut = new ByteArrayOutputStream();
        ImageIO.write(image, "JPEG", jpegOut);
        jpegOut.close();
        return jpegOut.toByteArray();
    }

    public synchronized void writeJPEG(OutputStream outstream) throws IOException {
        IOUtils.write(imageData,  outstream);

    }

    public synchronized byte[] getJPEGData() {
        return imageData;
    }

}

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