how to convert programatically powerpoint to xml and back

I need to convert powerpoint file to a text based file such as xml o html progr开发者_运维问答amatically and do some proccesses in it and again convert the textbased file top powerpoint. I prefer to do it with java.

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Take a look at this: POI and specifically POI-HSLF

You need to read the ppt and extract the contents and form your xml doc. Post manipulation you need to create back the ppt.