WHAT IS POI? The POI project consists of APIs for manipulating various file formats based upon Microsoft's OLE 2 Compound Document format using pure Java. Support for reading and writing Microsoft Excel files and property information is mature and work continues on reading and writing the MS Word format. SO you can only manipulate WORD and EXCEL using POI.
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Microsoft applications like "Word", "Excel" or "Powerpoint" let the user describe his document by properties like "title", "category" and so on. The application itself adds further information: last author, creation date etc. These document properties are stored in so-called property set streams. A property set stream is a separate document within a POI filesystem. We'll call property set streams mostly just "property sets". HPSF is POI's pure-Java implementation to read and write property sets.The HPSF HOWTO describes what a Java application should do to read a property set using HPSF, how to retrieve the information it needs, and how to write properties into the document.HPSF of POI
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HPSF is our port of the OLE 2 property set format to pure Java. Property sets are mostly use to store a document's properties (title, author, date of last modification etc.), Currently HPSF supports read functionality only. That shows you can only set attributes like as title, author, date of last modification etc.)