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How to add files to an existing zip file?

Posted on 2006-06-22
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Last Modified: 2012-05-05
I need to add files to an already existing zip file, here's what I have so far, this searches for files of a certain ext and zips them up.

I would like to maybe pass in a file name, and add that to an already existing zip file.

I have no idea where to start.

help.

thanks.

---------------------------------------------------------



import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FilenameFilter;
import java.io.IOException;
import java.util.zip.Deflater;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

public class ZipIt
{
    private static final String dir = "C:\\Temp\\";
    private static final String ext = ".TMP";

    public ZipIt()
    {        
    }

    public static void main(String[] args)
    {
        ZipIt z = new ZipIt();
        String[] filesToZip = z.getFilesToZip();

        byte[] buffer = new byte[18024];
        String zipFileName = dir + "example.zip";
        try
        {
            ZipOutputStream out = new ZipOutputStream(new FileOutputStream(zipFileName));
            out.setLevel(Deflater.DEFAULT_COMPRESSION);
            for (int i = 0; i < filesToZip.length; i++)
            {
                FileInputStream in = new FileInputStream(dir + filesToZip[i]);
                out.putNextEntry(new ZipEntry(dir + filesToZip[i]));
                int len;
                while ((len = in.read(buffer)) > 0)
                {
                    out.write(buffer, 0, len);
                }
                out.closeEntry();
                in.close();
            }
            out.close();
        }
        catch (IllegalArgumentException iae)
        {
            iae.printStackTrace();
        }
        catch (FileNotFoundException fnfe)
        {
            fnfe.printStackTrace();
        }
        catch (IOException ioe)
        {
            ioe.printStackTrace();
        }
    }

    private String[] getFilesToZip()
    {
        return new File(dir).list(
                new FilenameFilter()
                {
                    public boolean accept(File dir, String name)
                    {
                        return name.toUpperCase().endsWith(ext);
                    }
                });
    }
}
0
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Question by:arctanx
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8 Comments
 
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by:
CEHJ earned 75 total points
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You'll need to make a new archive, add all, then delete and rename if necessary
0
 
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Author Comment

by:arctanx
Comment Utility
You mean make a new archive, unzip the old one, THEN add all?

There's not a way I can just add one file to an archive already there?

This sounds like alot of work.
0
 
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Expert Comment

by:CEHJ
Comment Utility
>>You mean make a new archive, unzip the old one, THEN add all?

Yes.

You might find that using Ant programatically makes things a bit easier
0
 
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Author Comment

by:arctanx
Comment Utility
So then that means I'll need to delete the original archive first, then rename the new archive the old name?

Or would it be better to create a temp directory, do the work there, and then trash the whole directory?

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by:objects
objects earned 50 total points
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Expert Comment

by:CEHJ
Comment Utility
>>So then that means I'll need to delete the original archive first, then rename the new archive the old name?

Yes

>>Or would it be better to create a temp directory, do the work there, and then trash the whole directory?

If you don't mind the same file name in a different directory, then yes
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Author Comment

by:arctanx
Comment Utility
Thanks fellas.

This info will get me what I need.
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Expert Comment

by:CEHJ
Comment Utility
:-)
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