The Apache Jakarta Project's POI subproject is a pure Java port of Microsoft's OLE 2 Compound Documentation format and related file formats.
The Apache Jakarta POI project contains the following subcomponents:
- HSSF (Horrible SpreadSheet Format) - reads and writes Microsoft Excel (XLS) aka BIFF 8(+) format files.
- HPSF (Horrible Property Set Format) - reads "Document Summary" information from Microsoft Office files
- HDF (Horrible Document Format) - reads Microsoft Word (DOC) format files.
More information can be found on the Jakarta POI homepage (http://jakarta.apache.org/poi).