如何从两个日期之间的jsp页面获取数据并生成PDF或Excel报告

I am now working on java project till i had completed to get data from database and display it in table as datagrid in jsp page then that data to be converted to PDF or Excel report also done. But now my Problem is if to take history of data i have to refer date from and to date between two date i have to display data in PDF or Excel now i had strucked in that process please can anyone tell me how to do that.I am now working on java project till i had com