Adding files to existing zip archive

[Zargham Khan]

Hullo
I want to add a file to already existing zip archive but it always replaces the files in zip with new ones. I am opening file stream as appendable but stil it is not working. I am using the following code

  
FileOutputStream fileOutStream = new FileOutputStream(archiveName, true);
ZipOutputStream zipOutStream = new ZipOutputStream(fileOutStream);
FileInputStream fis = new FileInputStream(fileName);
ZipEntry entry = new ZipEntry(fileName);
if (!entry.isDirectory()) {
zipOutStream.putNextEntry(entry);
BufferedInputStream bis = new BufferedInputStream(fis);
byte data[] = new byte[BUFFER];
int count = 0;
while ((count = bis.read(data, 0, BUFFER)) != -1) {
zipOutStream.write(data);
} //end while
bis.close();
}
zipOutStream.closeEntry();
zipOutStream.flush();
zipOutStream.finish();
zipOutStream.close();
fis.close();
fileOutStream.close();

[Idly Vada]

The built-in Java archive classes contain no support for modifying an existing archive. They only let you build one from scratch. To modify an archive, you must copy it to another archive, performing the modifications along the way.
For more info:
http://www.javaworld.com/javaworld/jw-10-2000/jw-1027-toolbox.html
I think this will solve ur problem.