java - How to untar a TAR file using Apache Commons

Question

I'm using the Apache Commons 1.4.1 library to compress and uncompress ".tar.gz" files.

I'm having trouble with the last bit -- converting a TarArchiveInputStream into a FileOutputStream.

Oddly enough, it's breaking on this line:

FileOutputStream fout = new FileOutputStream(destPath);

---

destPath is a File with a Canonical path of: C:Documents and SettingsAdministratorMy DocumentsJavaWorkspaceBackupUtilityuntarredTestsubdirestinsub.txt

Error produced:

Exception in thread "main" java.io.IOException: The system cannot find the path specified

Any idea what it could be? And why is it not able to find the path?

I'm attaching the whole method below (most of which is lifted from here).

private void untar(File dest) throws IOException {
    dest.mkdir();
    TarArchiveEntry tarEntry = tarIn.getNextTarEntry();
    // tarIn is a TarArchiveInputStream
    while (tarEntry != null) {// create a file with the same name as the tarEntry
        File destPath = new File(dest.toString() + System.getProperty("file.separator") + tarEntry.getName());
        System.out.println("working: " + destPath.getCanonicalPath());
        if (tarEntry.isDirectory()) {
            destPath.mkdirs();
        } else {
            destPath.createNewFile();
            FileOutputStream fout = new FileOutputStream(destPath);
            tarIn.read(new byte[(int) tarEntry.getSize()]);
            fout.close();
        }
        tarEntry = tarIn.getNextTarEntry();
    }
    tarIn.close();
}

Answer 1

Your program has the java heap space error. so I think a little change needed. here is code...

public static void uncompressTarGZ(File tarFile, File dest) throws IOException {
    dest.mkdir();
    TarArchiveInputStream tarIn = null;

    tarIn = new TarArchiveInputStream(
                new GzipCompressorInputStream(
                    new BufferedInputStream(
                        new FileInputStream(
                            tarFile
                        )
                    )
                )
            );

    TarArchiveEntry tarEntry = tarIn.getNextTarEntry();
    // tarIn is a TarArchiveInputStream
    while (tarEntry != null) {// create a file with the same name as the tarEntry
        File destPath = new File(dest, tarEntry.getName());
        System.out.println("working: " + destPath.getCanonicalPath());
        if (tarEntry.isDirectory()) {
            destPath.mkdirs();
        } else {
            destPath.createNewFile();
            //byte [] btoRead = new byte[(int)tarEntry.getSize()];
            byte [] btoRead = new byte[1024];
            //FileInputStream fin 
            //  = new FileInputStream(destPath.getCanonicalPath());
            BufferedOutputStream bout = 
                new BufferedOutputStream(new FileOutputStream(destPath));
            int len = 0;

            while((len = tarIn.read(btoRead)) != -1)
            {
                bout.write(btoRead,0,len);
            }

            bout.close();
            btoRead = null;

        }
        tarEntry = tarIn.getNextTarEntry();
    }
    tarIn.close();
} 

good luck