files to text

- excel to text

http://www.andykhan.com/jexcelapi/index.html

 

- word to text

http://www.textmining.org/modules.php?op=modload&name=Downloads&file=index&req=viewdownloaddetails&lid=2&ttitle=TextMining.org_Word_6.0/97/2000/XP/2003_Text_Extractor_v0.4

 

- rtf, Microsoft other document(I estimate).

Majix

 

- pdf

pdfbox

 

 

- openoffice