Classes used when indexing document with Lucene:

Document(Field Field Field Field Field...)-->Analyzer-->IndexWriter-->Directory


Core Indexing classes:

IndexWriter类： central component of the indexing process.

Directory类：the location of a Lucene index.

Analyzer类：extracting those tokens out of text that should be indexed and eliminating the rest.

Document类：a collection of fields.

Field类：each document in an index contains one or more named fields.



Core Searching classes:

IndexSearcher类： open an index in a read-only mode.


Directory dir = FSDirectory.open(new File("/tmp/index"));
IndexSearcher searcher = new IndexSearcher(dir);
Query q=new TermQuery(new Term("contents","lucene"));
TopDocs hits = searcher.search(q,10);
searcher.close();

Term类：

Query类：

TermQuery类：

TopDocs类： a simple container of pointers to the top N ranked search results--documents that match a given query.