[英]Editing jpeg EXIF data with Java
我想編輯 jpg 文件的屬性,如:評論、標題、拍攝日期、相機制造商等。
我找到了可以讀取這些數據的圖書館。 但是我需要一個帶有示例的免費庫來編輯它們。
我知道 apache 的成像 (sanselan)。 但我無法用它編輯數據。 如果您以前自己使用過它,只有在您提供示例代碼而不是他們網站上的代碼時,我才會接受它作為答案。 因為即使我使用他們的示例,我也無法編輯 GPS 數據以外的任何屬性。 在我運行代碼后,文件屬性詳細信息仍然具有相同的值。
謝謝 !
注意:我還嘗試了 JHeader ( https://sourceforge.net/projects/jheader/ ),但將它用作帶有 -cl 選項的進程仍然沒有更改屬性列表。
Apache commons Imaging 對我有用。
我已經擴展了此處提供的示例
很明顯我的客戶端代碼看起來像這樣
public static void main(String[] args) throws ImageWriteException, ImageReadException, IOException {
new WriteExifMetadataExample().changeExifMetadata(new File("somefilename.jpg"), new File("result_file.jpg"));
}
以及 WriteExifMetadataExample 中的擴展方法
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);
}
}
請只注意我添加附加標簽的行
final TiffOutputDirectory exifDirectory = outputSet
.getOrCreateRootDirectory();
exifDirectory
.removeField(ExifTagConstants.EXIF_TAG_SOFTWARE);
exifDirectory.add(ExifTagConstants.EXIF_TAG_SOFTWARE,
"SomeKind");
結果是正確添加了 EXIF 標簽
要更改評論標簽,您可以執行以下操作
final TiffOutputDirectory exifDirectory = outputSet.getOrCreateRootDirectory();
exifDirectory.removeField(MicrosoftTagConstants.EXIF_TAG_XPCOMMENT);
exifDirectory.add(MicrosoftTagConstants.EXIF_TAG_XPCOMMENT, "SomeKind");
可用常量的完整列表在包中:
org.apache.commons.imaging.formats.tiff.constants
要更改評論標簽,您可以執行以下操作
final TiffOutputDirectory exifDirectory = outputSet.getOrCreateRootDirectory();
exifDirectory.removeField(MicrosoftTagConstants.EXIF_TAG_XPCOMMENT);
exifDirectory.add(MicrosoftTagConstants.EXIF_TAG_XPCOMMENT, "SomeKind");
可用常量的完整列表在包中:
org.apache.commons.imaging.formats.tiff.constants
您需要使用 Microsoft 標簽約束來編輯標簽
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