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From KK <>
Subject Re: Posting unicode data to lucene not working during searching/retreival!
Date Thu, 21 May 2009 07:02:00 GMT
Thanks for your quick response. Let me explain the whole thing.
I'm downloading the pages for give urls and then extracting text and
converting that to unicode utf-8 this way,

byte [] utfEncodeByteArray = textOnly.getBytes();
String utfString = new String(utfEncodeByteArray, Charset.forName("UTF-8"));

here textonly is the text extracted from the downloaded page, and this is
the way i'm donwloading the pages,
private String downloadPage(URL pageUrl) {
        try {
            // Open connection to URL for reading.
            BufferedReader reader =
                    new BufferedReader(new InputStreamReader(

            // Read page into buffer.
            String line;
            StringBuffer pageBuffer = new StringBuffer();
            while ((line = reader.readLine()) != null) {

            return pageBuffer.toString();
        } catch (Exception e) {

        return null;

I'm I going wrong anywhere, do I've to specify the charset when opening hte
And yes for indexing I'm using ,
package solrSearch;

import org.apache.lucene.analysis.SimpleAnalyzer;
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;

public class SimpleIndexer {

  // Base Path to the index directory
  private static final String baseIndexPath = "/opt/lucene/index/";

  public void createIndex(String pageContent, String pageId, String coreId)
throws Exception {
    String trueIndexPath = baseIndexPath + "core" + coreId ;
    String contentField = "content";
    String idField    = "id";

    // Create a writer
    IndexWriter writer = new IndexWriter(trueIndexPath, new

    System.out.println("Adding page to lucene " + pageId);
    Document doc = new Document();
    doc.add(new Field(contentField, pageContent, Field.Store.YES,
    doc.add(new Field(idField, pageId, Field.Store.YES,

    // Add documents to the index

    // Lucene recommends calling optimize upon completion of indexing

    // clean up

  public static void main(String args[]) throws Exception{
       SimpleIndexer empIndex = new SimpleIndexer();
    empIndex.createIndex("this is sample test content", "test0", "core0");
    System.out.println("Data indexed by lucene");


and for searcher this is the code
package solrSearch;

import org.stringtree.json.JSONWriter;
import java.util.*;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.index.FilterIndexReader;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.queryParser.QueryParser;

/** Simple searcher  */
public class SimpleSearcher {
    private static final String baseIndexPath = "/opt/lucene/index/" ;
    private Map resultMap = new HashMap();

    public String searchIndex(String queryString, String coreId) throws
        String result = "@#";
        String trueIndexPath = baseIndexPath + "core" + coreId;
        String searchField = "content";
         IndexSearcher searcher = new IndexSearcher(trueIndexPath);
        QueryParser queryParser = null;
        try {
            queryParser = new QueryParser(searchField, new
        } catch (Exception ex) {

        Query query = queryParser.parse(queryString);

        Hits hits = null;
        try {
             hits =;
        } catch (Exception ex) {

        int hitCount = hits.length();
        System.out.println("Results found :" + hitCount);

        for (int ix=0; (ix<hitCount && ix<10); ix++) {
             Document doc = hits.doc(ix);
            result = result + doc.get("id") + "," + doc.get("content");
            resultMap.put(doc.get("id"), doc.get("content"));
        JSONWriter writer = new JSONWriter();
        return writer.write(resultMap);
        //return result;

    public static void main(String args[]) throws Exception{
         SimpleSearcher searcher = new SimpleSearcher();
        String queryString = args[0];
        System.out.println("Quering for :" + queryString);
        searcher.searchIndex(queryString, "0");

NB: Please ignore improper naming conventions. indentations etc.
Can some one point me whats going wrong. And one more thing when I tried to
see the indexed docs using the LUKE, I found that the doc content contains
one regional char and then &#2367 like this but when I clicked "show " for
that page it showed me the true regional content wihtout any of "?" or the
above &#... things. It seems the indexing is fine but I've to modify my
searcher . How to do that, any hints? Thank you very much. One more thing
when searching throuh luke I'm able to see many results but through my
SimpleSearcher class I'm not able to see all these results for the same
query. What could be the reason?


On Thu, May T21, 2009 at 12:03 PM, Uwe Schindler <> wrote:

> Indexed data is coming out in the same way as put in. Lucene works with
> Java
> Strings, so encoding is irrelevant. When you index your values, you must be
> sure, to construct your index string/char arrays correctly using the UTF-8
> encoding (e.g. by using a standard Java Reader, new String byte[], charset)
> and so on. When you then print stored fields you must do the same in the
> other direction. So the general rule: Always specify the correct charset
> when converting to/from strings to bytes.
> For searching: It roughly also depends also on the Analyzer used during
> indexing and searching. Often analyzers written for specific languages
> cannot correctly handle characters from foreign languages. But e.g.
> StandardAnalyzer or WhitespaceAnalyzer does not modify the tokens in any
> way
> (if making them lowercase is not a problem).
> -----
> Uwe Schindler
> H.-H.-Meier-Allee 63, D-28213 Bremen
> eMail:
> > -----Original Message-----
> > From: KK []
> > Sent: Thursday, May 21, 2009 3:25 PM
> > To:
> > Subject: Posting unicode data to lucene not working during
> > searching/retreival!
> >
> > How to post utf-8 unicoded data to lucene index. Do we have to specify
> > something special, any sort of flag saying that we're posting unicoded
> > data?
> > I tried to post some utf-8 encoded data, during retrieval I'm not able to
> > see those data , there are just "?" marks in all those places. Earlier I
> > was
> > using Solr and I was posting using the same method and retreival was also
> > working fine, but I dont' know what is the issue with lucene, may be I'm
> > missing something. Can someone tell me what could be the issue? Thank
> you.
> >
> > KK,
> ---------------------------------------------------------------------
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