How to decompress .tgz files in java

I want to know, how to decompress .tgz file to .tar using apache commons. As i am able to extract the .tar file but for .tgz file first i need to bring it to .tar which I seems to be an issue for me. .tgz file is something which i need to unzip it first so that .tar will be available. However, zip extraction is not working on .tgz file for me.

My main concern is , how to decompress .tgz file to .tar.

any suggestion. thanks.

Solution

You don't need Apache Commons for .tgz to tar. That's because .tgz is .tar with GZIP compression applied. Create an InputStream for the file, wrap it in a GZIPInputStream, and read from that. You can use that directly in creating a TarArchiveInputStream if you want:

try (InputStream source = Files.newInputStream(file);
        GZIPInputStream gzip = new GZIPInputStream(source);
        TarArchiveInputStream tar = new TarArchiveInputStream(gzip)) {

    TarArchiveEntry entry;
    while ((entry = tar.getNextTarEntry()) != null) {
        // do somthing with entry
    }
}