如何在Java中提取tar文件?
如何在Java中提取tar(或tar.gz或tar.bz2)文件?
你可以使用Apache Commons Compress库来做到这一点。您可以从 http://mvnrepository.com/artifact/org.apache.commons/commons-compress/1.2 下载 1.2 版本。
这里有两种方法:一种用于解压缩文件,另一种用于解压缩文件。因此,对于文件<文件名>tar.gz,您需要先解压缩它,然后再解压缩它。请注意,tar 存档也可能包含文件夹,在这种情况下,需要在本地文件系统上创建它们。
享受。
/** 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;
}
注意:此功能后来通过一个单独的项目Apache Commons Compress发布,如另一个答案所述。这个答案已经过时了。
我没有直接使用tar API,但tar和bzip2是在Ant中实现的;你可以借用他们的实现,或者可能使用Ant来做你需要的事情。
Gzip是Java SE的一部分(我猜Ant实现遵循相同的模型)。
GZIPInputStream
只是一个装饰者。例如,您可以将 a 包装在 a 中,并以与使用任何 :InputStream
FileInputStream
GZIPInputStream
InputStream
InputStream is = new GZIPInputStream(new FileInputStream(file));
(请注意,GZIPInputStream 有自己的内部缓冲区,因此将 包装在 中可能会降低性能。FileInputStream
BufferedInputStream