lucene学习之二基本搜索

最新推荐文章于 2025-12-02 19:53:50 发布

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文章标签：

#lucene #junit #query #action #exception #ant

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本文详细介绍了使用Lucene进行搜索测试的过程，包括获取目录、创建索引搜索器、构建主题和关键词查询，以及使用查询解析器进行复杂查询。测试覆盖了单个关键词和多个关键词的搜索，验证了搜索结果的一致性和准确性。

public class BasicSearchingTest extends TestCase {

  public void testTerm() throws Exception {
    Directory dir = TestUtil.getBookIndexDirectory(); //A
    IndexSearcher searcher = new IndexSearcher(dir);  //B

    Term t = new Term("subject", "ant");
    Query query = new TermQuery(t);
    TopDocs docs = searcher.search(query, 10);
    assertEquals("Ant in Action",                //C
                 1, docs.totalHits);                         //C

    t = new Term("subject", "junit");
    docs = searcher.search(new TermQuery(t), 10);
    assertEquals("Ant in Action, " +                                 //D
                 "JUnit in Action, Second Edition",                  //D
                 2, docs.totalHits);                                 //D

    searcher.close();
    dir.close();
  }

  /*
    #A Obtain directory from TestUtil
    #B Create IndexSearcher
    #C Confirm one hit for "ant"
    #D Confirm two hits for "junit"
  */

  public void testKeyword() throws Exception {
    Directory dir = TestUtil.getBookIndexDirectory();
    IndexSearcher searcher = new IndexSearcher(dir);

    Term t = new Term("isbn", "9781935182023");
    Query query = new TermQuery(t);
    TopDocs docs = searcher.search(query, 10);
    assertEquals("JUnit in Action, Second Edition",
                 1, docs.totalHits);

    searcher.close();
    dir.close();
  }

  public void testQueryParser() throws Exception {
    Directory dir = TestUtil.getBookIndexDirectory();
    IndexSearcher searcher = new IndexSearcher(dir);

    QueryParser parser = new QueryParser(Version.LUCENE_30,      //A
                                         "contents",                  //A
                                         new SimpleAnalyzer());       //A

    Query query = parser.parse("+JUNIT +ANT -MOCK");                  //B
    TopDocs docs = searcher.search(query, 10);
    assertEquals(1, docs.totalHits);
    Document d = searcher.doc(docs.scoreDocs[0].doc);
    assertEquals("Ant in Action", d.get("title"));

    query = parser.parse("mock OR junit");                            //B
    docs = searcher.search(query, 10);
    assertEquals("Ant in Action, " + 
                 "JUnit in Action, Second Edition",
                 2, docs.totalHits);

    searcher.close();
    dir.close();
  }
  /*
#A Create QueryParser
#B Parse user's text
  */
}