Newbie for plot/draw graph in Java

Hi everybody:
I really need help from anyone of you who know the problem that i am facing now. I have all the data in an excel file (.xls). I would like to retireve all the data(all float integers in two coloumn and 300 rows) from this excel file and draw/plot out a graph based on the data in that excel file using java. Can i know how to do that? Is there any available package that i can use? I will be appreciate if there is some sample codes for me. Thank you.
Serene

http://jakarta.apache.org/poi/index.html
http://www.jfree.org/jfreechart/

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