Would either of these fit the bill. I saw your comment about lucene, but 
I think Solr can be used as a tool to do what you want.
http://lucene.apache.org/solr/


Bryan O'Neal wrote:
> Ok, so I want to, with utmost efficacy, go through a web pages and ask 
> how many of a set of key words is in that web page. Does any one know of 
> a good open source tool for this?
> I have hundreds of web pages and a near equal number of key word sets so 
> scraping each page, parsing to create a vector of strings and doing a a 
> set of nested for loop to run through each vector and compare to words 
> in the key word vector is, well, FAR from efficient. 
> I heard of Apache velocity, but that seems to be for creating pages on 
> the fly. I also heard of Apache lucene, but appears to be for 
> implementing your own query engine on your application server 
> (to index and query your pages)
> 
> Also, if you know of a local ACTIVE java forum I would love to know 
> about it. I have subscribed to a half dozen lists and there is nothing 
> but silence.
> 
> Thanks a bunch :)
> 
> 
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