Extract information from Javadoc files

I want to extract class, method & parameter information from the javadoc files (in html format, not from source code).
Are there any existing API's / opensource projects that would help me do this.
I have tried searching google and the forums, but I end up finding results related to extracting javadoc info from the source files. However I am interested in recovering this information from the generated HTML files.
Any pointers would be helpful.
- Ajay

The situation is like this: I have a stub jar file alongwith the documentation in HTML form. The classes in the jar file do not have any debug information so eclipse can not extract any parameter name information from the jar file. It does extract some info from the documentation, but quite a lot of the variables are still not named.
It becomes a tedious job to work with the API when you can not figure out which parameter refers to what. I have to often lookup the documentation to figure it out.
My plan is to recreate the stub jar by decompiling it and merging the parameter name information derived from the html documentation to create create source files. Then I can recompile them with debugging enabled to generate class files.
Any ideas or open source projects that would let me do this quickly?

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