Java add file to existing zip archive

Ok so it doesn't look like the java. To get around this I do the following: 1 create a new Zip file 2 read the contents of the old Zip file and write them out to the new Zip, appending the new entries on the end of I would like to append a file to an existing zip file using ZipOutputStream.

Please provide some sample code to do that. I used the following code. Hi All, My requirement is to append the data to a file inside a zip file.

Again, ZipOutputStream implements the AutoCloseable interface, so it is best to use with a try-with-resources statement. The only real catch is to remember to close your ZipEntry when you are done with each one to make it clear when it should no longer receive data. If you've copied a File in Java before then you are essentially already a PRO at creating a zip archive from an existing file or directory for that matter.

Again, the only real difference is that you need to take a little extra caution to be sure you are matching files up to the appropriate ZipEntry instances.

In this example I create an input file "FileToZip. Zipping a non-empty directory becomes a little more involved, especially if you want to maintain empty directories within the parent directory. To maintain the presence of an empty directory within a zip archive you need to be sure to create an entry that is suffixed with the file system directory separator when creating it's ZipEntry , and then immediately close it. Post as a guest Name. Email Required, but never shown.

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Accept all cookies Customize settings. This post and this website contains affiliate links. See my disclosure about affiliate links. There are several programs, both command line and GUI based that will allow you to view and extract the contents of an archive. But sometimes, you will need to modify an existing archive file, such as add files to archive, delete an existing file or renaming a file. Most of the GUI applications, like Ark support adding and deleting files using the drag and drop.

This is accomplished by extracting the archive in memory and performing the modification operation. The archive is then re-archived from memory and saved to the disk. A GUI interface may not always be available and you may want to modify the archive from command line without extracting it completely. You always do have the option of extracting the archive to the hard disk first.

You can then modify the contents and re-create the archive from the modified content.