The POI project consists of APIs for manipulating various file formats based upon Microsoft's OLE 2 Compound Document format using pure Java. In short, you can read and write MS Excel files using Java. Soon, you'll be able to read and write Word files using Java. POI is your Java Excel solution as well as your Java Word solution.
Changes
his release contains numerous bug fixes, as well as new features such as Excel formula evaluation and initial PowerPoint support.
URL: Jakarta POI - Java API To Access Microsoft Format Files