Apache POI - the Java API for Microsoft Documents

The Apache POI Project's mission is to create and maintain Java APIs for manipulating various file formats based upon the Office Open XML standards (OOXML) and Microsoft's OLE 2 Compound Document format (OLE2).
Homepage:	http://poi.apache.org/

Description

The Apache POI Project's mission is to create and maintain Java APIs for manipulating various file formats based upon the Office Open XML standards (OOXML) and Microsoft's OLE 2 Compound Document format (OLE2). In short,  you can read and write MS Excel files using Java. In addition,  you can read and write MS Word and MS PowerPoint files using Java.