java - How to create a custom search box without using indexer(lucene) and google custom search -

I need to create a custom search box for my site that contains dynamic pages, when I enter the details in the search box Find out if he should search the entire website and return the results on that particular website.

But I need an approach other than Google custom search and indexers like Lucene.

I also see a third party vendors who provide free indexing.