lucene学习之二搜索片段(Fragments)-优快云博客

本文介绍如何使用Lucene进行全文检索，包括创建IndexSearcher、实时更新IndexReader、执行查询及使用QueryParser等关键技术。通过具体代码示例展示了如何实现基本的搜索功能。

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public class Fragments {

  public void openSearcher() throws Exception {
    Directory dir = FSDirectory.open(new File("/path/to/index"));
    IndexReader reader = IndexReader.open(dir);
    IndexSearcher searcher = new IndexSearcher(reader);
  }

  public void nrtReader() throws Exception {
    IndexReader reader = null;
    IndexSearcher searcher;
    // START
    IndexReader newReader = reader.reopen();
    if (reader != newReader) {
      reader.close();
      reader = newReader;
      searcher = new IndexSearcher(reader);
    }
    // END
  }

  public void testSearchSigs() throws Exception {
    Query query = null;
    Filter filter = null;
    TopDocs hits;
    TopFieldDocs fieldHits;
    Sort sort = null;
    Collector collector = null;
    int n = 10;
    IndexSearcher searcher = null;

    hits = searcher.search(query, n);
    hits = searcher.search(query, filter, n);
    fieldHits = searcher.search(query, filter, n, sort);
    searcher.search(query, collector);
    searcher.search(query, filter, collector);
  }

  public void queryParserOperator() throws Exception {
    Analyzer analyzer = null;
    // START
    QueryParser parser = new QueryParser(Version.LUCENE_30,
                                         "contents", analyzer);
    parser.setDefaultOperator(QueryParser.AND_OPERATOR);
    // END
  }
}