Is it possible to create a Zip-Archive in Java if I do not want to write the resulting archive to disk but send it somewhere else?
The idea is that it might be a waste to create a file on disk when you want to send the Zip-Archive to a user via HTTP (e.g. from a Database-Blob or any other Data-Store).
I would like to create a
java.util.zip.ZipOutputStream
or a
apache.commons.ZipArchiveOutputStream
where the Feeder would be a ByteArrayOutputStream coming from my Subversion Repository
Creating a zip archive for a single file is very easy, we need to create a ZipOutputStream object from the FileOutputStream object of destination file. Then we add a new ZipEntry to the ZipOutputStream and use FileInputStream to read the source file to ZipOutputStream object.
write(byte[] buf, int off, int len) method writes an array of bytes to the current ZIP entry data. This method will block until all the bytes are written.
Yes this is absolutely possible!
Create your Zip entry using the putNextEntry
method on the ZipOutputStream
then put the bytes into the file in the zip by calling write
on the ZipOutputStream
. For the parameter for that method, the byte[]
, just extract them from the ByteArrayOutputStream
with its toByteArray
method.
And the ZipOutputStream
can be sent anywhere, as its constructor just takes an OutputStream
so could be e.g. your HTTP response.
Something like that would work:
ZipOutputStream zs = new ZipOutputStream(outputStream) ;
ZipEntry e = new ZipEntry(fileName);
zs.putNextEntry(e);
zs.write(...);
zs.close();
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