How to realize download by jsp

Is there any class in jdk to handle with download some files to client?
I mean, when a request of download some file comes, how could jsp handle this request and push request file to client?(some thing like browser's work)
thank you

What are we talking about here?
You want to write a server which can hand over files to a client? Thru HTTP or FTP?
Give more info plz.
Greetz, Sjon

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