Trying to access(Read, Write, Modify, FileOutput to some file types like text,CSV format) MS Excel Format becomes easy using Apache PIO [HSSF and XSSF for Excel Documents]
Thanks Harada san for introducing it
Download the [poi-bin-3.5-beta3-20080926.zip] and include PIO jars in your JAVA project and make some reference to its API and thats it, you can start experimenting and making fun!
Things I like about it:
1. Can Formulate the formula inside the Excel file using [org.apache.poi.hssf.usermodel.HSSFFormulaEvaluator;]
2. Fast in processing
3. Not that very complicated, I think.
Reference: