exporting data to excel

I am currently working on an appl using gwtext. However, i need to
export data to an excel for users to save in their local machines. I
wonder how this can do done. I will have a button or some sort and
when it is clicked, the presenter will call the server (which gets
data from DB) using GWT RPC. Do I use Poi or jExcel to create the
excel from server? then how can users save the file in their local
machines? pls help. any tutorials or samples would be great. thanks

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