Converting between file types w/ Java

Hello,

I am looking for java programs (with source) that do the following :

Convert Word to text from Java
Convert HTML to text with correct layout and spacing
Call Visual Basic or C++ from Java
~Found kind of here, still need help with calling vb [L=http://www.javaworld.com/javaworld/javatips/jw-javatip17.html]http://www.javaworld.com/javaworld/javatips/jw-javatip17.html[/L]
Convert PDF to text from Java
~Found on sourceforge.net - pdfbox
Convert PowerPoint to text from Java

I am working on a project and we are doing the feasibility analysis of certain features...so that's why I need the open source.

Word to text and PowerPoint to text will probably not be out there. Both formats are closed and to actually read them you have to try and reverse-engineer them. That's an extremely tedious process, so it's unlikely that anyone would go through it without a good reason to. The people of OpenOffice did it, for example, but their code is in C++.

Calling VB from Java...
In theory, it shouldn't be too hard. Sun offers or offered for free (but I don't think open source) a wrapper that reflects Java Beans into ActiveX - which is what VB classes are in the end. Doing the reverse ought not to be too hard. You would do it with some native modules for Java written in C++, that read a type library and inject the resulting information into the virtual machine. I can give you some hints there.

As for calling C++ from Java, you only have to write a wrapper for the C++ classes in JNI.

Converting HTML to text requires an HTML parser and a formatter. How hard this is is merely a question of how sophisticated you want it to be. Should it interpret CSS? Should it basically act as a text browser outputting into a text file?

Oh, and the tag for links is URL, not L.