I am working on an application where I need to integrate the search engine. This should do crawling also. Please suggest a good Java based search engine.
Thank you in advance.
Nutch (Lucene) is an Open Source engine which should satisfy your needs.
In the past I worked with terrier, a search engine written in Java:
Terrier is a highly flexible, efficient, effective, and robust search engine, readily deployable on large-scale collections of documents. Terrier implements state-of-the-art indexing and retrieval functionalities. Terrier provides an ideal platform for the rapid development of large-scale retrieval applications.
I've spent the last 2 years developing our own high performance search engine with C. For Java I highly suggest Apache Lucene as Ajay mentioned above. For Java, it's the best in terms of speed, relevancy and features.
来源：https://stackoverflow.com/questions/1350884/what-is-a-good-web-search-and-web-crawling-engine-for-java