BlogJava-Do you drink java?-随笔分类-OpenSource

import java.io.*;

import java.nio.*;

import java.nio.channels.*;

import java.util.*;

import com.drew.imaging.jpeg.*;

import com.drew.metadata.*;

import com.drew.metadata.exif.*;

public class ExifExtractor {

public ExifExtractor() {

}

public static void main(String[] args) {

try {

Metadata metadata = JpegMetadataReader.readMetadata(new File("o_P4140147.JPG.jpg"));

Iterator directories = metadata.getDirectoryIterator();

while (directories.hasNext()) {

Directory directory = (Directory) directories.next();

Iterator tags = directory.getTagIterator();

while (tags.hasNext()) {

Tag tag = (Tag) tags.next();

// modify Exif

// if (tag.getTagName().equalsIgnoreCase("User Comment")) {

// Directory exifDirectory = metadata.getDirectory(ExifDirectory.class);

// exifDirectory.setString(tag.getTagType(), "LeonChen");

// }

// read thumbnail

if (tag.getTagName().equalsIgnoreCase("Thumbnail Data")) {

Directory exifDirectory = metadata.getDirectory(ExifDirectory.class);

byte[] dataBuffer = exifDirectory.getByteArray(tag.getTagType());

FileChannel channel = new RandomAccessFile(new File("thumbnail.jpg"),

"rw").getChannel();

MappedByteBuffer fileBuffer = channel.map(FileChannel.MapMode.

READ_WRITE, 0, dataBuffer.length);

fileBuffer.put(dataBuffer);

fileBuffer.force();

channel.close();

}

// print exif

System.out.println(tag);

}

catch (FileNotFoundException ex) {

ex.printStackTrace();

}

catch (IOException ex) {

ex.printStackTrace();

}

catch (MetadataException ex) {

ex.printStackTrace();

}

catch (JpegProcessingException ex) {

ex.printStackTrace();

}