How to create a tar.gz file from a list of files

One option

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();
        }
    }
}

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Using Zipinputstream

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();
}

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Sorry, I want to tar/compress a list of files, and then gzip it, not the other way around.

Also I am using jdk 1.7.

Here you go..use this bit of code.. You will be able to create tar.gz

protected void makeCompress(String srcFile) throws IOException {  
    File outFile = new File(srcFile + ".tar");  
    List<File> list = new ArrayList<>(1);  
    File file = new File(srcFile);  
    list.add(file);  
    compressFiles(list, outFile);         
}  
   
private void compressFiles(List<File> list, File outFile) throws IOException {  
    try (TarArchiveOutputStream taos = new TarArchiveOutputStream(
            new GZIPOutputStream(new BufferedOutputStream(new FileOutputStream(outFile))))) {
 
        taos.setBigNumberMode(TarArchiveOutputStream.BIGNUMBER_STAR);  
        taos.setLongFileMode(TarArchiveOutputStream.LONGFILE_GNU);  
           
        for (File f : list) {
            System.out.println("send to cmpress: " + f.getName());  
            addFileToCompression(taos, f, ".");  
        }  
    } // all streams are automatically closed here, whether an exception occurs or not
}  
   
private void addFileToCompression(TarArchiveOutputStream taos, File f, String dir) throws IOException {  
    System.out.println(f.getName() + " dir : " + dir);  
    TarArchiveEntry tae = new TarArchiveEntry(f, dir + "/");          
    taos.putArchiveEntry(tae);  
    if (f.isDirectory()) {  
        /*TarArchiveEntry tae = new TarArchiveEntry(f, dir + "/");       
        taos.putArchiveEntry(tae);*/ 
        System.out.println("is a directory");  
        taos.closeArchiveEntry();  
        for (File childFile : f.listFiles()) {  
            System.out.println("child: " + childFile.getName());  
            addFileToCompression(taos, childFile, dir + "/" + f.getName() + "/" + childFile.getName());  
        }  
    } else {  
        System.out.println("is a file " + f.getName());  
        try (FileInputStream fis = new FileInputStream(f)) {
            IOUtils.copy(fis, taos);  
        }  
        System.out.println("file added");  
        taos.flush();  
        taos.closeArchiveEntry();  
    }
}

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Line no.2..update with this below code.

File outFile = new File(srcFile + ".tar.gz");

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the way the TarArchiveEntry is created - without the "/" added to the entry name. With the "/" I get a .tar.gz file with only folders, not files.

makeCompress() is not being used at all.  I am trying this:

 public static void main( String[] args ) throws IOException, InterruptedException
    {
    		List<File> fileList = new ArrayList<File>();
    		fileList.add(new File("/Users/212353126/Documents/Renewables/pub/appdata/data/temp/ba_11600002_1446535324358.csv"));
    		fileList.add(new File("/Users/212353126/Documents/Renewables/pub/appdata/data/temp/mk_11600025_1446535324358.csv"));

    		TarGZDemo demo = new TarGZDemo();
    		demo.compressFiles(fileList, new File("/Users/212353126/Documents/Renewables/pub/appdata/data/temp/test.tar.gz"));
    }

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I do get a .tar.gz file, but when I do tar -zxvf test.tar.gz I get an empty error.