如何在java中列出tar文件的所有条目？

Question

I want to list all the entries of a tar file in my Java program. How is it possible ? For zip files, I can use the below code:

ZipFile zf = new ZipFile("ReadZip.zip");
Enumeration entries = zf.entries();
while (entries.hasMoreElements()) {.....}

But I am not sure for the tar files. Can anybody help? I am using org.apache.tools.tar.*

Answer 1

Apache Commons Compress (http://commons.apache.org/compress/) is easy to use.

Here's an example of reading a tar's entries:

import java.io.FileInputStream;

import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
import org.apache.commons.compress.archivers.tar.TarArchiveInputStream;

public class Taread {
    public static void main(String[] args) {
        try {
            TarArchiveInputStream tarInput = new TarArchiveInputStream(new FileInputStream(args[0]));
            TarArchiveEntry entry;
            while (null!=(entry=tarInput.getNextTarEntry())) {
                System.out.println(entry.getName());
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

Answer 2

This API is very similar to using Java's own ZipInputStream .

To start off:

TarInputStream tis = new TarInputStream(new FileInputStream("myfile.tar"));
try
{
    TarEntry entry;
    do
    {
        entry = tis.getNextEntry();

        //Do something with the entry
    }
    while (entry != null);
}
finally
{
    tis.close();
}

More examples with different APIs are [here][2].

Answer 3

you were using the ZIP file code for listing the directories....

tar file for linux you can check out

http://www.java2s.com/Code/Java/File-Input-Output/TapeArchiveListerTarfile.htm

for further references....

Answer 4

To read a Java .jar file, you can use the "jar" tool ... or Unzip. .Jar files are in .Zip format.

To read a *nix .tar file, however, you need to use the "tar" tool.

If you're on Windows, I'd encourage you to try 7-Zip. It's a handy tool that recognizes a zillion formats ... including both .zip (hence also .jar) and tar:

http://www.7-zip.org/

If you must do it programmatically, I guess the Apache Ant API "tar" is a good way to go. It gives you a list of "TarEntry":

http://www.jajakarta.org/ant/ant-1.6.1/docs/ja/manual/api/org/apache/tools/tar/TarEntry.html