How to compress a large file before downloading it?

hiii guyz
this is my first post
i have a large excel sheet or a number of excel sheets that r generated using Jakarta poi...so b4 downloading them i hav 2 compress them into any zipped format like Zip or Gzip .....
i dont know how to Start n really confused at this stage how to do that...
please help me complete my task.....
Thanx n Regards
.......Chinnu..........

hey thanx very much man....
u had da solution in a flicker....
if there is a problem i will getback 2 u...
Thanx
Chinnu

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