Look at ZipStreamOutput class from:
http://code.google.com/p/audao/source/browse/#svn/trunk/modules/embed/src/java/com/spoledge/audao/generator
The usage in GAE or generally in servlets is as simple as following:
private void responseAsZipStream( HttpServletResponse response )
throws IOException {
// prepare buffers:
ByteArrayOutputStream bos = new ByteArrayOutputStream();
ZipStreamOutput output = new ZipStreamOutput( bos );
byte[] buf = new byte[4096];
// now create the ZIP archive as you want:
OutputStream os1 = output.addStream( "file1.txt" );
// write to the output stream 1 , but do not close it -
ZipStreamOutput does it itself:
os1.write( whatever );
os1.flush();
....
OutputStream os2 = output.addStream( "file2.txt" );
// write to the output stream 2 , but do not close it -
ZipStreamOutput does it itself:
os2.write( whatever );
os2.flush();
....
// finish the ZIP stream:
output.finish();
// now pass it as the HTTP response:
byte[] data = bos.toByteArray();
response.setContentType( "application/zip" );
response.setContentLength( data.length );
response.setHeader( "Content-Disposition", "inline; filename="
+ "filename.zip");
response.getOutputStream().write( data );
}
This works on gae - I use it at audao.spoledge.com
Vaclav
On Sep 15, 3:19 am, Bit Liner <[email protected]> wrote:
> My app creates dinamically two files so that then the users can
> download these files in one zip file.
>
> But i have problem in implementing this operations.
>
> Some suggestion to help me?
> Library, if gae supports this operations, etc.
>
> (i have tried to use gaeVfs, but i have met problems: i cannot write
> the content of a file on the response, so i can download the file but
> its content is empty )
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