com.test.LuceneDemo.java Source code

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Here is the source code for com.test.LuceneDemo.java

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/**
 * Copyright (c) 2005-2012 https://github.com/javahuang
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 */
package com.test;

import static org.junit.Assert.assertEquals;

import java.io.IOException;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.TextField;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.queryparser.classic.QueryParser;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.RAMDirectory;
import org.junit.Test;

/**
 * Apache Lucene is a high-performance, full-featured text search engine library
 * 
 * <p/>
 * <p>
 * User: Huang rp
 * <p>
 * Date: 2015517 ?11:52:50
 * <p>
 * Version: 1.0
 */
public class LuceneDemo {

    @Test
    public void test() throws IOException, org.apache.lucene.queryparser.classic.ParseException {
        Analyzer analyzer = new StandardAnalyzer();

        // Store the index in memory:
        Directory directory = new RAMDirectory();
        // To store an index on disk, use this instead:
        //Directory directory = FSDirectory.open("/tmp/testindex");
        IndexWriterConfig config = new IndexWriterConfig(analyzer);
        IndexWriter iwriter = new IndexWriter(directory, config);
        Document doc = new Document();
        String text = "This is the text to be indexed.";
        doc.add(new Field("fieldname", text, TextField.TYPE_STORED));
        iwriter.addDocument(doc);
        iwriter.close();

        // Now search the index:
        DirectoryReader ireader = DirectoryReader.open(directory);
        IndexSearcher isearcher = new IndexSearcher(ireader);
        // Parse a simple query that searches for "text":
        QueryParser parser = new QueryParser("fieldname", analyzer);
        Query query = parser.parse("indexed");
        ScoreDoc[] hits = isearcher.search(query, null, 1000).scoreDocs;
        assertEquals(1, hits.length);
        // Iterate through the results:
        for (int i = 0; i < hits.length; i++) {
            Document hitDoc = isearcher.doc(hits[i].doc);
            assertEquals("This is the text to be indexed.", hitDoc.get("fieldname"));
        }
        ireader.close();
        directory.close();
    }
}