What is the best way to write an excel file from Java? [closed]

Question

What library would you guys recommend to write an excel file from Java? It has to be pure Java solution, so it will work on any platform.

Thanks, Grae

EDIT: It can't be CSV file format. It has to have column headers, data format type, etc.

Answer 1

The best solution I've found for generating Microsoft document formats is the Apache POI library: http://poi.apache.org/