java - 使用lucene进行前缀搜索

Question

我正在尝试使用 lucene 搜索功能进行自动完成。我有以下代码，它通过查询前缀进行搜索，但除此之外，它还提供了包含该单词的所有句子，而我希望它只显示以该前缀开头的句子或单词。

例如:米--holiday mansion 船屋--眼睛m肌肉--电影历代电影--机器机器

我希望它只显示最后 2 个查询。如何做到这一点也被困在这里，我也是 lucene 的新手。请任何人在这方面帮助我。提前致谢。

       addDoc(IndexWriter w, String title, String isbn) throws IOException {
    Document doc = new Document();
    doc.add(new Field("title", title, Field.Store.YES, Field.Index.ANALYZED));

    // use a string field for isbn because we don't want it tokenized
    doc.add(new Field("isbn", isbn, Field.Store.YES, Field.Index.ANALYZED));
    w.addDocument(doc);

 }

主要:

    try {
        // 0. Specify the analyzer for tokenizing text.
        //    The same analyzer should be used for indexing and searching
        StandardAnalyzer analyzer = new StandardAnalyzer();

        // 1. create the index
        Directory index = FSDirectory.open(new File(indexDir));
        IndexWriter writer = new IndexWriter(index, new StandardAnalyzer(Version.LUCENE_30), true, IndexWriter.MaxFieldLength.UNLIMITED); //3

        for (int i = 0; i < source.size(); i++) {
            addDoc(writer, source.get(i), + (i + 1) + "z");
        }

        writer.close();


        // 2. query
      Term term = new Term("title", querystr);
      //create the term query object
     PrefixQuery query = new PrefixQuery(term);



        // 3. search
        int hitsPerPage = 20;
        IndexReader reader = IndexReader.open(index);
        IndexSearcher searcher = new IndexSearcher(reader);
        TopScoreDocCollector collector =      TopScoreDocCollector.create(hitsPerPage, true);
        searcher.search(query, collector);
        ScoreDoc[] hits = collector.topDocs().scoreDocs;

        // 4. Get results
        for (int i = 0; i < hits.length; ++i) {
            int docId = hits[i].doc;
            Document d = searcher.doc(docId);

            System.out.println(d.get("title"));


        }

        reader.close();


    } catch (Exception e) {
        System.out.println("Exception (LuceneAlgo.getSimilarString()) : " + e);
    }


}


 }

Answer 1

我看到两种解决方案:

1. 按照 Yahnoosh 的建议，将标题字段保存两次，一次保存为 TextField(=已分析)，一次保存为 StringField(未分析)

2. 将其保存为 TextField，但查询时使用 SpanFirstQuery

// 2. query
Term term = new Term("title", querystr);
//create the term query object
PrefixQuery pq = new PrefixQuery(term);
SpanQuery wrapper = new SpanMultiTermQueryWrapper<PrefixQuery>(pq);
Query final = new SpanFirstQuery(wrapper, 1);