How to waite for a file to be written in a godd way?

Hello!

I wonder if any one got a good solution for this problem.

I got a servlet that boundles a couple of files and stores them into a zip-file.

When the zip-file is written to disk the servlet should display a link to the zip-file so the user is able to download it.

But my servlet is in a bit of a hurry, it displays the link before the zip-file exists.

So if any one could give a good solution for this it would be great.

Correct me if I'm wrong when I say that this looks bad:

//write the zip file

while(!zipFile.exits())
{
}

//Display the response

Best regards
Fredrik