How to Compress/Decompress tar.gz files in java

Question

Can anyone show me the correct way to compress and decompress tar.gzip files in java i\'ve been searching but the most i can find is either zip or gzip(alone).

Answer 1

To extract the contents of .tar.gz format, I successfully use apache commons-compress ('org.apache.commons:commons-compress:1.12'). Take a look at this example method:

public void extractTarGZ(InputStream in) {
    GzipCompressorInputStream gzipIn = new GzipCompressorInputStream(in);
    try (TarArchiveInputStream tarIn = new TarArchiveInputStream(gzipIn)) {
        TarArchiveEntry entry;

        while ((entry = (TarArchiveEntry) tarIn.getNextEntry()) != null) {
            /** If the entry is a directory, create the directory. **/
            if (entry.isDirectory()) {
                File f = new File(entry.getName());
                boolean created = f.mkdir();
                if (!created) {
                    System.out.printf("Unable to create directory '%s', during extraction of archive contents.\n",
                            f.getAbsolutePath());
                }
            } else {
                int count;
                byte data[] = new byte[BUFFER_SIZE];
                FileOutputStream fos = new FileOutputStream(entry.getName(), false);
                try (BufferedOutputStream dest = new BufferedOutputStream(fos, BUFFER_SIZE)) {
                    while ((count = tarIn.read(data, 0, BUFFER_SIZE)) != -1) {
                        dest.write(data, 0, count);
                    }
                }
            }
        }

        System.out.println("Untar completed successfully!");
    }
}