Here you go:
Analyzer a=new StandardAnalyzer();
//open an index
String textFieldName="contents";
IndexReader reader=IndexReader.open("E:/indexes/uksites");
IndexSearcher searcher=new IndexSearcher(reader);
QueryParser qp=new QueryParser(textFieldName,a);
//create a query (note one word is rarer than the other)
Query q=qp.parse("football club");
//Create a query scorer (passing a reader so that it can weight
terms based on doc frequency)
QueryScorer fragScorer = new QueryScorer(q,reader,"contents");
//callibrate the scoring range based on best (ie rarest) search term
float topScore=fragScorer.getMaxTermWeight();
//Create a gradient formatter with appropriate color ranges
GradientFormatter formatter=new
GradientFormatter(topScore,"#888888","#ff8888","#ffffff",
"#ffffff");
//create the highlighter
Highlighter highlighter=new Highlighter(formatter,fragScorer);
//run the query and highlight the results - graded by color to
reflect value of match
Hits hits = searcher.search(q);
int numToShow=Math.min(10,hits.length());
for (int i = 0; i < numToShow; i++)
{
String text=hits.doc(i).get(textFieldName);
TokenStream tokenStream = a.tokenStream(textFieldName, new
StringReader(text));
String highlightText =
highlighter.getBestFragments(tokenStream, text, 2, "...");
System.out.println("["+i+"="+hits.score(i)+"]"+highlightText);
}
Cheers,
Mark
Mohammad Hasan wrote:
Dear all,
I need a working example of Gradient Formatter. I want to highlight a
searched word after it is found in the database. I am using NHibernate
Search & Lucene. But I am an entrly level programmer, so I do not know how
to use Gradient Formatter. There are plenty of examples of HTML Formatter
but no example for Gradient Formatter. Gradient Formatter asks for 5
arguments, that is where I run into troubles. I do not understand these 5
arguments. Instead of giving explanation, please post a working example of
Gradient Formatter of Highlighter which will highlight a searched word after
it is found in a database. Thanks.
Hasan
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