我如何在Java中解压tar(或tar.gz或tar.bz2)文件?
/** Untar an input file into an output file.
* The output file is created in the output folder, having the same name
* as the input file, minus the '.tar' extension.
*
* @param inputFile the input .tar file
* @param outputDir the output directory file.
* @throws IOException
* @throws FileNotFoundException
*
* @return The {@link List} of {@link File}s with the untared content.
* @throws ArchiveException
*/
private static List<File> unTar(final File inputFile, final File outputDir) throws FileNotFoundException, IOException, ArchiveException {
LOG.info(String.format("Untaring %s to dir %s.", inputFile.getAbsolutePath(), outputDir.getAbsolutePath()));
final List<File> untaredFiles = new LinkedList<File>();
final InputStream is = new FileInputStream(inputFile);
final TarArchiveInputStream debInputStream = (TarArchiveInputStream) new ArchiveStreamFactory().createArchiveInputStream("tar", is);
TarArchiveEntry entry = null;
while ((entry = (TarArchiveEntry)debInputStream.getNextEntry()) != null) {
final File outputFile = new File(outputDir, entry.getName());
if (entry.isDirectory()) {
LOG.info(String.format("Attempting to write output directory %s.", outputFile.getAbsolutePath()));
if (!outputFile.exists()) {
LOG.info(String.format("Attempting to create output directory %s.", outputFile.getAbsolutePath()));
if (!outputFile.mkdirs()) {
throw new IllegalStateException(String.format("Couldn't create directory %s.", outputFile.getAbsolutePath()));
}
}
} else {
LOG.info(String.format("Creating output file %s.", outputFile.getAbsolutePath()));
final OutputStream outputFileStream = new FileOutputStream(outputFile);
IOUtils.copy(debInputStream, outputFileStream);
outputFileStream.close();
}
untaredFiles.add(outputFile);
}
debInputStream.close();
return untaredFiles;
}
/**
* Ungzip an input file into an output file.
* <p>
* The output file is created in the output folder, having the same name
* as the input file, minus the '.gz' extension.
*
* @param inputFile the input .gz file
* @param outputDir the output directory file.
* @throws IOException
* @throws FileNotFoundException
*
* @return The {@File} with the ungzipped content.
*/
private static File unGzip(final File inputFile, final File outputDir) throws FileNotFoundException, IOException {
LOG.info(String.format("Ungzipping %s to dir %s.", inputFile.getAbsolutePath(), outputDir.getAbsolutePath()));
final File outputFile = new File(outputDir, inputFile.getName().substring(0, inputFile.getName().length() - 3));
final GZIPInputStream in = new GZIPInputStream(new FileInputStream(inputFile));
final FileOutputStream out = new FileOutputStream(outputFile);
IOUtils.copy(in, out);
in.close();
out.close();
return outputFile;
}
inputFile.getName().length() - 3)
来避免硬编码扩展名长度,使用 inputFile.getName().lastIndexOf("."))
更为妥当。 - martin_wun我没有直接使用过tar API,但是Ant中实现了tar和bzip2;你可以借用他们的实现,或者可能使用Ant来完成你需要的工作。
Gzip是Java SE的一部分(我猜Ant的实现遵循相同的模型)。
GZIPInputStream
只是一个InputStream
装饰器。您可以将FileInputStream
包装在GZIPInputStream
中,然后像使用任何InputStream
一样使用它:
InputStream is = new GZIPInputStream(new FileInputStream(file));
(请注意,GZIPInputStream
有其自己的内部缓冲区,因此将FileInputStream
包装在BufferedInputStream
中可能会降低性能。)
Archiver archiver = ArchiverFactory.createArchiver("tar", "gz");
archiver.extract(archiveFile, destDir);
依赖:
<dependency>
<groupId>org.rauschig</groupId>
<artifactId>jarchivelib</artifactId>
<version>0.5.0</version>
</dependency>
Apache Commons VFS 支持 tar 作为虚拟文件系统,该文件系统支持像这样的 URL:tar:gz:http://anyhost/dir/mytar.tar.gz!/mytar.tar!/path/in/tar/README.txt
我刚刚尝试了一些建议的库(TrueZip、Apache Compress),但都没有成功。
这里有一个使用Apache Commons VFS的示例:
FileSystemManager fsManager = VFS.getManager();
FileObject archive = fsManager.resolveFile("tgz:file://" + fileName);
// List the children of the archive file
FileObject[] children = archive.getChildren();
System.out.println("Children of " + archive.getName().getURI()+" are ");
for (int i = 0; i < children.length; i++) {
FileObject fo = children[i];
System.out.println(fo.getName().getBaseName());
if (fo.isReadable() && fo.getType() == FileType.FILE
&& fo.getName().getExtension().equals("nxml")) {
FileContent fc = fo.getContent();
InputStream is = fc.getInputStream();
}
}
这是Maven的依赖项:
<dependency>
<groupId>commons-vfs</groupId>
<artifactId>commons-vfs</artifactId>
<version>1.0</version>
</dependency>
public static void unTarGz( Path pathInput, Path pathOutput ) throws IOException {
TarArchiveInputStream tararchiveinputstream =
new TarArchiveInputStream(
new GzipCompressorInputStream(
new BufferedInputStream( Files.newInputStream( pathInput ) ) ) );
ArchiveEntry archiveentry = null;
while( (archiveentry = tararchiveinputstream.getNextEntry()) != null ) {
Path pathEntryOutput = pathOutput.resolve( archiveentry.getName() );
if( archiveentry.isDirectory() ) {
if( !Files.exists( pathEntryOutput ) )
Files.createDirectory( pathEntryOutput );
}
else
Files.copy( tararchiveinputstream, pathEntryOutput );
}
tararchiveinputstream.close();
}
Files.copy
不是将整个归档复制到一个文件中吗? - Yann