HSSF is the POI Project's pure Java implementation of the Excel '97(-2002) file format.
HSSF provides a way to read spreadsheets create, modify, read and write XLS spreadsheets
- low level structures for those with special needs
- an eventmodel api for efficient read-only access
- a full usermodel api for creating, reading and modifying XLS files
Truth be told there is probably a better way to generate your spreadsheet
generation (yet you'll still be using HSSF indirectly). At the time of
this writing we're in the process of moving the HSSF Serializer over to
the Apache Cocoon
Project. With Cocoon you can serialize any XML datasource (of
which might be a ESQL page outputting in SQL for instance) by simply
applying the stylesheet and designating the serializer.
If you're merely reading spreadsheet data, then use the eventmodel api
in the org.apache.poi.hssf.eventmodel package.
If you're modifying spreadsheet data then use the usermodel api. You
can also generate spreadsheets this way, but using Cocoon (which will do
it this way indirectly) is the best way...we promise.