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POHow to use Lucene IndexReader to read index in version 4.4?
 

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  1. POHow to use Lucene IndexReader to read index in version 4.4?
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    <p>For the just the sake of learning I've created an index from 1 file and wanted to search it. I am using Lucene Version 4.4. I know that indexing part is true. </p> <p>tempFileName is the name of file which contains tokens and this file has the following words : </p> <p>"odd plus odd is even ## even plus even is even ## odd plus even is odd ##"</p> <p>However when I provide a query it returns nothing. I can't see what would be the problem. Any help is greatly appreciated.</p> <p>Indexing part : </p> <pre><code>public void startIndexingDocument(String indexPath) throws IOException { Analyzer analyzer = new WhitespaceAnalyzer(Version.LUCENE_44); SimpleFSDirectory directory = new SimpleFSDirectory(new File(indexPath)); IndexWriterConfig config = new IndexWriterConfig(Version.LUCENE_44, analyzer); IndexWriter writer = new IndexWriter(directory, config); indexDocs(writer); writer.close(); } private void indexDocs(IndexWriter w) throws IOException { Document doc = new Document(); File file = new File(tempFileName); BufferedReader br = new BufferedReader(new FileReader(tempFileName)); Field field = new StringField(fieldName, br.readLine().toString(), Field.Store.YES); doc.add(field); w.addDocument(doc); } </code></pre> <p>Searching part :</p> <pre><code>public void readFromIndex(String indexPath) throws IOException, ParseException { Analyzer anal = new WhitespaceAnalyzer(Version.LUCENE_44); QueryParser parser = new QueryParser(Version.LUCENE_44, fieldName, anal); Query query = parser.parse("odd"); IndexReader reader = IndexReader.open(NIOFSDirectory.open(new File( indexPath))); IndexSearcher searcher = new IndexSearcher(reader); TopScoreDocCollector collector = TopScoreDocCollector.create(10, true); searcher.search(query, collector); ScoreDoc[] hits = collector.topDocs().scoreDocs; // display System.out.println("fieldName =" + fieldName); System.out.println("Found : " + hits.length + " hits."); for (int i = 0; i &lt; hits.length; i++) { int docId = hits[i].doc; Document d = searcher.doc(docId); System.out.println((i + 1) + ". " + d.get(fieldName)); } reader.close(); } </code></pre>
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