Commons Imaging 介绍
Apache Commons Imaging 前身是 Apache Commons Sanselan ，这是一个用来读写各种图像格式的 Java
类库，包括快速解析图片的基本信息（大小、色彩空间、ICC配置等）和元数据。尽管慢点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，提供简单访问元数据的方法。javadoc
读取图像EXIF信息的示例代码：
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) { } } } } }
Commons Imaging 官网
http://commons.apache.org/proper/commons-imaging/
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