"Lucene" Pronounce,Meaning And Examples

"Lucene" Meaning

Lucene is a high-performance, full-featured text search engine library written in Java. It is widely used in many search engines, and it provides a simple to use API for people and programs to use in their own applications.

"Lucene" Examples

Lucene


Lucene is a popular open-source text search engine library for Java, used in many search engines. Here are 5 usage examples:

1. Basic Search

java
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.TopDocs;

// Create an index and search for a specific phrase
IndexSearcher searcher new IndexSearcher(new DirIndexReader(new File("index")));
Query q new TermQuery(new Term("title", "hello"));
TopDocs results searcher.search(q, 10);

2. Detailed Search

java
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.queryParser.ParseException;
import org.apache.lucene.search.BooleanClause;
import org.apache.lucene.search.BooleanQuery;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.TopDocs;

// Search for documents containing either "hello" or "world"
IndexSearcher searcher new IndexSearcher(new DirIndexReader(new File("index")));
BooleanQuery booleanQuery new BooleanQuery();
BooleanClause clause1 new BooleanClause(new TermQuery(new Term("title", "hello")), BooleanClause.Occur.SHOULD);
BooleanClause clause2 new BooleanClause(new TermQuery(new Term("title", "world")), BooleanClause.Occur.SHOULD);
booleanQuery.add(clause1, clause2);
TopDocs results searcher.search(booleanQuery, 10);

3. Indexing Documents

java
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;

// Create a new index writer to write to the index
IndexWriter writer new IndexWriter(new File("index"), new IndexWriterConfig(new StandardAnalyzer()));
Document doc new Document();
doc.add(new Field("title", "This is a test document", Field.Store.YES, Field.Index.ANALYZED));
writer.addDocument(doc);

4. Term Frequency Inversion

java
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.TermFrequency;
import org.apache.lucene.search.TermFrequency.TermFreq;

// Search