Java Code Examples for com.drew.imaging.jpeg.JpegMetadataReader#readMetadata()

/**
 * 获取图片正确显示需要旋转的角度（顺时针）
 */
private static final int getRotateAngle(InputStream is) throws TSException {
    int angle = 0;
    Metadata metadata;
    try {
        metadata = JpegMetadataReader.readMetadata(is);
        Directory directory = metadata.getDirectory(ExifDirectory.class);
        if (directory.containsTag(ExifDirectory.TAG_ORIENTATION)) {
            // Exif信息中方向　　
            int orientation = directory.getInt(ExifDirectory.TAG_ORIENTATION);
            // 原图片的方向信息
            if (6 == orientation) {
                //6旋转90
                angle = 90;
            } else if (3 == orientation) {
                //3旋转180
                angle = 180;
            } else if (8 == orientation) {
                //8旋转90
                angle = 270;
            }
        }
    } catch (Exception e) {
        throw new TSException(TSEDictionary.UNDEFINED_FAIL.getCode(), "iphone图片服务器旋转异常");
    }
    return angle;
}
 

/**
 * 获取图片正确显示需要旋转的角度（顺时针）
 *
 * @return
 * @throws Exception
 */
private static final int getRotateAngle(File file) throws TSException {
    int angle = 0;
    Metadata metadata;
    try {
        metadata = JpegMetadataReader.readMetadata(file);
        Directory directory = metadata.getDirectory(ExifDirectory.class);
        if (directory.containsTag(ExifDirectory.TAG_ORIENTATION)) {
            // Exif信息中方向　　
            int orientation = directory.getInt(ExifDirectory.TAG_ORIENTATION);
            // 原图片的方向信息
            if (6 == orientation) {
                //6旋转90
                angle = 90;
            } else if (3 == orientation) {
                //3旋转180
                angle = 180;
            } else if (8 == orientation) {
                //8旋转90
                angle = 270;
            }
        }
    } catch (Exception e) {
        throw new TSException(TSEDictionary.UNDEFINED_FAIL.getCode(), "iphone图片服务器旋转异常");
    }
    return angle;
}
 

@NotNull
public static Metadata readMetadata(@NotNull InputStream inputStream) throws JpegProcessingException, IOException
{
    if (!inputStream.markSupported())
        throw new IOException("Stream must support mark/reset");

    inputStream.mark(512);

    byte[] data = new byte[512];
    int bytesRead = inputStream.read(data);

    if (bytesRead == -1)
        throw new IOException("Stream is empty");

    inputStream.reset();

    for (int i = 0; i < bytesRead - 2; i++) {
        // Look for the first three bytes of a JPEG encoded file
        if (data[i] == (byte) 0xff && data[i + 1] == (byte) 0xd8 && data[i + 2] == (byte) 0xff) {
            long bytesSkipped = inputStream.skip(i);
            if (bytesSkipped != i)
                throw new IOException("Skipping stream bytes failed");
            break;
        }
    }

    return JpegMetadataReader.readMetadata(inputStream);
}
 

/**
 * Reads metadata from an {@link InputStream} of known length and file type.
 *
 * @param inputStream a stream from which the file data may be read.  The stream must be positioned at the
 *                    beginning of the file's data.
 * @param streamLength the length of the stream, if known, otherwise -1.
 * @param fileType the file type of the data stream.
 * @return a populated {@link Metadata} object containing directories of tags with values and any processing errors.
 * @throws ImageProcessingException if the file type is unknown, or for general processing errors.
 */
@NotNull
public static Metadata readMetadata(@NotNull final InputStream inputStream, final long streamLength, final FileType fileType) throws IOException, ImageProcessingException
{
    switch (fileType) {
        case Jpeg:
            return JpegMetadataReader.readMetadata(inputStream);
        case Tiff:
        case Arw:
        case Cr2:
        case Nef:
        case Orf:
        case Rw2:
            return TiffMetadataReader.readMetadata(new RandomAccessStreamReader(inputStream, RandomAccessStreamReader.DEFAULT_CHUNK_LENGTH, streamLength));
        case Psd:
            return PsdMetadataReader.readMetadata(inputStream);
        case Png:
            return PngMetadataReader.readMetadata(inputStream);
        case Bmp:
            return BmpMetadataReader.readMetadata(inputStream);
        case Gif:
            return GifMetadataReader.readMetadata(inputStream);
        case Ico:
            return IcoMetadataReader.readMetadata(inputStream);
        case Pcx:
            return PcxMetadataReader.readMetadata(inputStream);
        case WebP:
            return WebpMetadataReader.readMetadata(inputStream);
        case Raf:
            return RafMetadataReader.readMetadata(inputStream);
        case Avi:
            return AviMetadataReader.readMetadata(inputStream);
        case Wav:
            return WavMetadataReader.readMetadata(inputStream);
        case QuickTime:
            return QuickTimeMetadataReader.readMetadata(inputStream);
        case Mp4:
            return Mp4MetadataReader.readMetadata(inputStream);
        case Mp3:
            return Mp3MetadataReader.readMetadata(inputStream);
        case Eps:
            return EpsMetadataReader.readMetadata(inputStream);
        case Heif:
            return HeifMetadataReader.readMetadata(inputStream);
        case Unknown:
            throw new ImageProcessingException("File format could not be determined");
        default:
            return new Metadata();
    }
}