Apache Commons Imaging 前身是 Apache Commons Sanselan ，這是一個用來讀寫各種圖像格式的 Java 類庫，包括快速解析圖片的基本信息（大小、色彩空間、ICC配置等）和元數據。儘管慢點但非常好的可移植性。比起 ImageIO/JAI/Toolkit 更容易使用，支持更多的格式，提供簡單訪問元數據的方法。javadoc
讀取圖像EXIF信息的示例代碼：
package org.apache.commons.imaging.examples;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
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.common.RationalNumber;
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.imaging.formats.tiff.constants.ExifTagConstants;
import org.apache.commons.imaging.formats.tiff.write.TiffOutputDirectory;
import org.apache.commons.imaging.formats.tiff.write.TiffOutputSet;
import org.apache.commons.imaging.util.IoUtils;
public class WriteExifMetadataExample {
public void removeExifMetadata(final File jpegImageFile, final File dst)
throws IOException, ImageReadException, ImageWriteException {
OutputStream os = null;
try {
os = new FileOutputStream(dst);
os = new BufferedOutputStream(os);
new ExifRewriter().removeExifMetadata(jpegImageFile, os);
} finally {
if (os != null) {
try {
os.close();
} catch (final IOException e) {
}
}
}
}
/**
* This example illustrates how to add/update EXIF metadata in a JPEG file.
*
* @param jpegImageFile
* A source image file.
* @param dst
* The output file.
* @throws IOException
* @throws ImageReadException
* @throws ImageWriteException
*/
public void changeExifMetadata(final File jpegImageFile, final File dst)
throws IOException, ImageReadException, ImageWriteException {
OutputStream os = null;
try {
TiffOutputSet outputSet = null;
// note that metadata might be null if no metadata is found.
final IImageMetadata 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.
//
// see
// org.apache.commons.sanselan.formats.tiff.constants.AllTagConstants
//
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,
RationalNumber.factoryMethod(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);
}
// printTagValue(jpegMetadata, TiffConstants.TIFF_TAG_DATE_TIME);
os = new FileOutputStream(dst);
os = new BufferedOutputStream(os);
new ExifRewriter().updateExifMetadataLossless(jpegImageFile, os,
outputSet);
os.close();
os = null;
} finally {
if (os != null) {
try {
os.close();
} catch (final IOException e) {
}
}
}
}
/**
* This example illustrates how to remove a tag (if present) from EXIF
* metadata in a JPEG file.
*
* In this case, we remove the "aperture" tag from the EXIF metadata if
* present.
*
* @param jpegImageFile
* A source image file.
* @param dst
* The output file.
* @throws IOException
* @throws ImageReadException
* @throws ImageWriteException
*/
public void removeExifTag(final File jpegImageFile, final File dst) throws IOException,
ImageReadException, ImageWriteException {
OutputStream os = null;
try {
TiffOutputSet outputSet = null;
// note that metadata might be null if no metadata is found.
final IImageMetadata 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 (null == outputSet) {
// file does not contain any exif metadata. We don't need to
// update the file; just copy it.
IoUtils.copyFileNio(jpegImageFile, dst);
return;
}
{
// Example of how to remove a single tag/field.
// There are two ways to do this.
// Option 1: brute force
// Note that this approach is crude: Exif data is organized in
// directories. The same tag/field may appear in more than one
// directory, and have different meanings in each.
outputSet.removeField(ExifTagConstants.EXIF_TAG_APERTURE_VALUE);
// Option 2: precision
// We know the exact directory the tag should appear in, in this
// case the "exif" directory.
// One complicating factor is that in some cases, manufacturers
// will place the same tag in different directories.
// To learn which directory a tag appears in, either refer to
// the constants in ExifTagConstants.java or go to Phil Harvey's
// EXIF website.
final TiffOutputDirectory exifDirectory = outputSet
.getExifDirectory();
if (null != exifDirectory) {
exifDirectory
.removeField(ExifTagConstants.EXIF_TAG_APERTURE_VALUE);
}
}
os = new FileOutputStream(dst);
os = new BufferedOutputStream(os);
new ExifRewriter().updateExifMetadataLossless(jpegImageFile, os,
outputSet);
os.close();
os = null;
} finally {
if (os != null) {
try {
os.close();
} catch (final IOException e) {
}
}
}
}
/**
* This example illustrates how to set the GPS values in JPEG EXIF metadata.
*
* @param jpegImageFile
* A source image file.
* @param dst
* The output file.
* @throws IOException
* @throws ImageReadException
* @throws ImageWriteException
*/
public void setExifGPSTag(final File jpegImageFile, final File dst) throws IOException,
ImageReadException, ImageWriteException {
OutputStream os = null;
try {
TiffOutputSet outputSet = null;
// note that metadata might be null if no metadata is found.
final IImageMetadata 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/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);
}
os = new FileOutputStream(dst);
os = new BufferedOutputStream(os);
new ExifRewriter().updateExifMetadataLossless(jpegImageFile, os,
outputSet);
os.close();
os = null;
} finally {
if (os != null) {
try {
os.close();
} catch (final IOException e) {
}
}
}
}
}