Highlight the searched word when full-text searching performed

[Jerry Stern]

Hi all,
  I wonder how to highlight the searched word when full-text searching 
performed based on Lucene.
  At the indexing stage, the contents of a original file is regarded as a FIELD 
of a Lucene document:
   private static void indexFile(File file, IndexWriter idxWriter)
 throws IOException {
  System.out.print("Indexing " + file.getCanonicalPath() + " ......");
  
  Document doc = new Document();
  doc.add(Field.Text("path", file.getAbsolutePath()));
  doc.add(Field.Text("contents", new FileReader(file)));
  
  idxWriter.addDocument(doc);
  
  System.out.println("indexed.");
 }

  At the searching stage:
    Highlighter highlighter = new Highlighter(new QueryScorer(query));
  for (int i = 0; i < hits.length(); i++)
  {
   String text = hits.doc(i).get("contents"); // the text = null.

     TokenStream tokenStream = analyzer.tokenStream("path",
     new StringReader(text));
   // Get 3 best fragments and seperate with a "..."
   String result = highlighter.getBestFragments(tokenStream,
     text, 3, "...");
   System.out.println(result);
  }

  The 'contents' field is not stored in index file, and it is not reasonable to 
store it in index file. So the red line of code can not get the 'contents' 
field from the index file.
  I think that the 'text' parameter for the Highlighter.getBestFragments(..) 
method must be the context string of the searched word. So my question is how 
can I get the context string of the searched word?
   
  Thanks in advance!
   
  Stern Yi

                
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