Lucene:如何获得文档的分数

Question

我想输出文件的分数.我为此写的代码是:

IndexReader reader = IndexReader.open(FSDirectory.open(indexDir));
IndexSearcher searcher = new IndexSearcher(reader);
Analyzer analyzer = new IKAnalyzer();
QueryParser parser = new QueryParser(Version.LUCENE_31, "title",
            analyzer);
Query q = null;
q = parser.parse("MacOS");
TopDocs docs = searcher.search(q, 10);
ScoreDoc[] hits = docs.scoreDocs;
for(int i=0;i<hits.length;++i){
  System.out.println(hits[i].score);
}

但输出是NaN.我想知道如何获得文档的分数.

Answer 1

除了daulets之外,你必须在indexSearcher中启用评分:

...
searcher.setDefaultFieldSortScoring(true, true);
...

我认为这就是你的意思,但是那样它应该更清楚:)

Answer 2

        IndexReader reader = IndexReader.open(FSDirectory.open(indexDir));
        IndexSearcher searcher = new IndexSearcher(reader);
        Analyzer analyzer = new IKAnalyzer();
        QueryParser parser = new QueryParser(Version.LUCENE_31, "title", analyzer);
        Query q = null;
        q = parser.parse("MacOS");
        TopDocs docs = searcher.search(q, 10);
        ScoreDoc[] filterScoreDosArray = docs.topDocs().scoreDocs;
        for (int i = 0; i < filterScoreDosArray.length; ++i) {
            int docId = filterScoreDosArray[i].doc;
            Document d = is.doc(docId);
            System.out.println((i + 1) + ". " + d.get("docno")+" Score: "+ filterScoreDosArray[i].score);
        }

尝试这个。