Bearbeiten von jpeg-EXIF-Daten mit Java

Apache commons Imaging arbeitet für mich.

Habe ich erweitert die Probe hier

So offensichtlich mein client-code sieht wie folgt aus

public static void main(String[] args) throws ImageWriteException, ImageReadException, IOException {
    new WriteExifMetadataExample().changeExifMetadata(new File("somefilename.jpg"), new File("result_file.jpg"));
}

und der erweiterten Methode in WriteExifMetadataExample

public void changeExifMetadata(final File jpegImageFile, final File dst)
        throws IOException, ImageReadException, ImageWriteException {
    OutputStream os = null;
    boolean canThrow = false;
    try {
        TiffOutputSet outputSet = null;

        //note that metadata might be null if no metadata is found.
        final ImageMetadata metadata = Imaging.getMetadata(jpegImageFile);
        final JpegImageMetadata jpegMetadata = (JpegImageMetadata) metadata;
        if (null != jpegMetadata) {
            //note that exif might be null if no Exif metadata is found.
            final TiffImageMetadata exif = jpegMetadata.getExif();

            if (null != exif) {
                //TiffImageMetadata class is immutable (read-only).
                //TiffOutputSet class represents the Exif data to write.
                //
                //Usually, we want to update existing Exif metadata by
                //changing
                //the values of a few fields, or adding a field.
                //In these cases, it is easiest to use getOutputSet() to
                //start with a "copy" of the fields read from the image.
                outputSet = exif.getOutputSet();
            }
        }

        //if file does not contain any exif metadata, we create an empty
        //set of exif metadata. Otherwise, we keep all of the other
        //existing tags.
        if (null == outputSet) {
            outputSet = new TiffOutputSet();
        }

        {
            //Example of how to add a field/tag to the output set.
            //
            //Note that you should first remove the field/tag if it already
            //exists in this directory, or you may end up with duplicate
            //tags. See above.
            //
            //Certain fields/tags are expected in certain Exif directories;
            //Others can occur in more than one directory (and often have a
            //different meaning in different directories).
            //
            //TagInfo constants often contain a description of what
            //directories are associated with a given tag.
            //
            final TiffOutputDirectory exifDirectory = outputSet
                    .getOrCreateExifDirectory();
            //make sure to remove old value if present (this method will
            //not fail if the tag does not exist).
            exifDirectory
                    .removeField(ExifTagConstants.EXIF_TAG_APERTURE_VALUE);
            exifDirectory.add(ExifTagConstants.EXIF_TAG_APERTURE_VALUE,
                    new RationalNumber(3, 10));
        }

        {
            //Example of how to add/update GPS info to output set.

            //New York City
            final double longitude = -74.0; //74 degrees W (in Degrees East)
            final double latitude = 40 + 43 / 60.0; //40 degrees N (in Degrees
            //North)

            outputSet.setGPSInDegrees(longitude, latitude);
        }



        final TiffOutputDirectory exifDirectory = outputSet
                .getOrCreateRootDirectory();
        exifDirectory
                .removeField(ExifTagConstants.EXIF_TAG_SOFTWARE);
        exifDirectory.add(ExifTagConstants.EXIF_TAG_SOFTWARE,
                "SomeKind");

        os = new FileOutputStream(dst);
        os = new BufferedOutputStream(os);

        new ExifRewriter().updateExifMetadataLossless(jpegImageFile, os,
                outputSet);

        canThrow = true;
    } finally {
        IoUtils.closeQuietly(canThrow, os);
    }
}

Bitte achten Sie nur auf die Linie, wo ich zusätzliche tag

final TiffOutputDirectory exifDirectory = outputSet
                .getOrCreateRootDirectory();
        exifDirectory
                .removeField(ExifTagConstants.EXIF_TAG_SOFTWARE);
        exifDirectory.add(ExifTagConstants.EXIF_TAG_SOFTWARE,
                "SomeKind");

als Ergebnis EXIF-tag war richtig Hinzugefügt

Ändern Sie die Kommentare-Tags Sie können die folgenden

        final TiffOutputDirectory exifDirectory = outputSet.getOrCreateRootDirectory();
        exifDirectory.removeField(MicrosoftTagConstants.EXIF_TAG_XPCOMMENT);
        exifDirectory.add(MicrosoftTagConstants.EXIF_TAG_XPCOMMENT, "SomeKind");

die vollständige Liste der verfügbaren Konstanten ist in dem Paket:

org.apache.commons.imaging.formats.tiff.constants

Ändern Sie die Kommentare-Tags Sie können die folgenden

        final TiffOutputDirectory exifDirectory = outputSet.getOrCreateRootDirectory();
        exifDirectory.removeField(MicrosoftTagConstants.EXIF_TAG_XPCOMMENT);
        exifDirectory.add(MicrosoftTagConstants.EXIF_TAG_XPCOMMENT, "SomeKind");

die vollständige Liste der verfügbaren Konstanten ist in dem Paket:

org.apache.commons.imaging.formats.tiff.constants