On 27 Nov 2005, at 00:24, Jerry Stern wrote:
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?
In your case, you'll need to get the "path" field (since that is
being stored) and then load the file into a String to pass to the
highlighter. The text to highlight must be stored somewhere, and in
your case it is on the filesystem only.
Be carefuly - you're highlighting all hits there, which will have
issues if you get a lot of hits.
Erik
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