udhaya kp
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There are many different types of search engines and they can be implemented in a lot of different ways.
A forum is a good place to go if you're stuck on a particular problem or concept but questions such as "How can I implement a search engine?" are a bit beyond the scope of this venue.
The kind of help someone could give you here depends largely on your prior experience as well.
I would start with a Google search to see if there are any 3rd party libraries available to use as a starting point.
http://www.google.com/search?hl=en&q=Java+Search+Engine&btnG=Google+Search Anyway, this is not really a
Tomcat specific question.
I'm going to move this
thread to "General Computing".
-Ben