Commons Imaging-白红宇

Commons Imaging
阅读量：6223 次
发布时间：2019-06-21
本文共 8863 字，大约阅读时间需要 29 分钟。
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。
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 p_w_picpath 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 p_w_picpath.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 Cityfinal 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 p_w_picpath 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 p_w_picpath.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 p_w_picpath 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 p_w_picpath.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 Cityfinal 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) {}}}}}
转载于:https://blog.51cto.com/yangxianhong/1246318
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