How to use Lucene IndexReader to read index in version 4.4? - lucene

Question

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.
tempFileName is the name of file which contains tokens and this file has the following words :
"odd plus odd is even ## even plus even is even ## odd plus even is odd ##"
However when I provide a query it returns nothing. I can't see what would be the problem. Any help is greatly appreciated.
Indexing part :
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);
}
Searching part :
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 < hits.length; i++) {
int docId = hits[i].doc;
Document d = searcher.doc(docId);
System.out.println((i + 1) + ". " + d.get(fieldName));
}
reader.close();
}

Answer 1

The problem is that you are using a StringField. StringField indexes the entire input as a single token. Good for atomic strings, like keywords, identifiers, stuff like that. Not good for full text searching.
Use a TextField.

Answer 2

StringField have a single token. So, I try to test with simple code.
for example #yns~ If you have a file that this is cralwer file and this contents hava a single String.
ex) file name : data03.scd , contents : parktaeha
You try to search with "parktaeha" queryString.
You get the search result!
field name : acet, queryString parktaeha
======== start search!! ========== q=acet:parktaeha Found 1 hits. result array length :1 search result=> parktaeha
======== end search!! ==========
Look under the code. This code is test code.
while((target = in.readLine()) != null){
System.out.println("target:"+target);
doc.add(new TextField("acet",target ,Field.Store.YES)); // use TextField
// TEST : doc.add(new StringField("acet", target.toString(),Field.Store.YES));
}
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