How to specify the download file name??

Hi guys~~~
I have servlet which can generate a *.pdf file,I found if I didn't setContentType="application/pdf",I can download it!!But the download file name is my servlet file name.If I want to change the download file name,How do I do????
thanx a lot!!!Best regard!

Thanx for ur help...But I encounter a new charllenge now...
I use a javascript(window.open("/myservlet")) to open the download file servlet.
Everything is okay.But when I finish downloading the file which window I opened cant close itself automatically.
I am really not understand the header parameter of the HTML header,could someone give me something about this??
Thanx again!!!!

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