How to lock excel sheets using java

hi,
i have developed a web page using JSP which has to open an excel sheet and display the databese information in it.
but the prblem is the excel sheet has to be locked such tht the clients accessing it can only read the data but not change it.
can it be done thru programming it in java ?
kindly help.

the excel file is client side and JSP is server side
so how can you access it?
in other words, your JSP IS NOT opening an excel file, it's only facilitating the upload
POI from Apache is what we use as well, and it will allow you access to the data AFTER the excel file is transfered to the server

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