how to get the search words in result hits in Lucene. Help please!!!

For example:
search term = "java OR struts OR development OR spring OR framework"

I can use Searcher.search() to get the result hits. and I can use hits.doc() to retrieve document information.

here is my question: for each document in result hits, How I can know which words in search term just match the words in the result document? i.e. I get a document, which content contains the words: spring and framework, that's the reason this document got hit. is there possible to get these two words "spring" and "framework" in programmatic way.

any suggestions and clues will be much appreciated!!!