Lucene BooleanQuery类

发布于 2015-07-25 11:32:58 | 177 次阅读 | 评论: 0 | 来源: 网络整理

BooleanQuery 用于搜索的是使用 AND，OR或NOT运算符多个查询结果的文件。

类声明

以下是org.apache.lucene.search.BooleanQuery类的声明：

public class BooleanQuery
   extends Query
      implements Iterable<BooleanClause>

字段

• protected int minNrShouldMatch

类的构造函数

类方法

继承的方法

这个类继承了以下类方法：

• org.apache.lucene.search.Query

• java.lang.Object

使用

private void searchUsingBooleanQuery(String searchQuery1,
   String searchQuery2)throws IOException, ParseException{
   searcher = new Searcher(indexDir);
   long startTime = System.currentTimeMillis();
   //create a term to search file name
   Term term1 = new Term(LuceneConstants.FILE_NAME, searchQuery1);
   //create the term query object
   Query query1 = new TermQuery(term1);

   Term term2 = new Term(LuceneConstants.FILE_NAME, searchQuery2);
   //create the term query object
   Query query2 = new PrefixQuery(term2);

   BooleanQuery query = new BooleanQuery();
   query.add(query1,BooleanClause.Occur.MUST_NOT);
   query.add(query2,BooleanClause.Occur.MUST);

   //do the search
   TopDocs hits = searcher.search(query);
   long endTime = System.currentTimeMillis();

   System.out.println(hits.totalHits +
      " documents found. Time :" + (endTime - startTime) + "ms");
   for(ScoreDoc scoreDoc : hits.scoreDocs) {
      Document doc = searcher.getDocument(scoreDoc);
      System.out.println("File: "+ doc.get(LuceneConstants.FILE_PATH));
   }
   searcher.close();
}

应用程序示例

让我们创建一个测试Lucene的应用程序中使用BooleanQuery测试搜索。

LuceneConstants.java

这个类是用来提供可应用于示例应用程序中使用的各种常量。

package com.yiibai.lucene;

public class LuceneConstants {
   public static final String CONTENTS="contents";
   public static final String FILE_NAME="filename";
   public static final String FILE_PATH="filepath";
   public static final int MAX_SEARCH = 10;
}

Searcher.java

这个类用来读取就使用Lucene库的原始数据，并搜索数据的索引。

package com.yiibai.lucene;

import java.io.File;
import java.io.IOException;

import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.index.CorruptIndexException;
import org.apache.lucene.queryParser.ParseException;
import org.apache.lucene.queryParser.QueryParser;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
import org.apache.lucene.util.Version;

public class Searcher {
	
   IndexSearcher indexSearcher;
   QueryParser queryParser;
   Query query;

   public Searcher(String indexDirectoryPath) throws IOException{
      Directory indexDirectory = 
         FSDirectory.open(new File(indexDirectoryPath));
      indexSearcher = new IndexSearcher(indexDirectory);
      queryParser = new QueryParser(Version.LUCENE_36,
         LuceneConstants.CONTENTS,
         new StandardAnalyzer(Version.LUCENE_36));
   }

   public TopDocs search( String searchQuery) 
      throws IOException, ParseException{
      query = queryParser.parse(searchQuery);
      return indexSearcher.search(query, LuceneConstants.MAX_SEARCH);
   }
   
   public TopDocs search(Query query) throws IOException, ParseException{
      return indexSearcher.search(query, LuceneConstants.MAX_SEARCH);
   }

   public Document getDocument(ScoreDoc scoreDoc) 
      throws CorruptIndexException, IOException{
     return indexSearcher.doc(scoreDoc.doc);	
   }

   public void close() throws IOException{
      indexSearcher.close();
   }
}

LuceneTester.java

这个类是用来测试 Lucene 库的搜索能力。

package com.yiibai.lucene;

import java.io.IOException;

import org.apache.lucene.document.Document;
import org.apache.lucene.index.Term;
import org.apache.lucene.queryParser.ParseException;
import org.apache.lucene.search.BooleanClause;
import org.apache.lucene.search.PrefixQuery;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.TermQuery;
import org.apache.lucene.search.BooleanQuery;
import org.apache.lucene.search.TopDocs;

public class LuceneTester {
	
   String indexDir = "E:LuceneIndex";
   String dataDir = "E:LuceneData";
   Searcher searcher;

   public static void main(String[] args) {
      LuceneTester tester;
      try {
         tester = new LuceneTester();
         tester.searchUsingBooleanQuery("record1.txt","record1");
      } catch (IOException e) {
         e.printStackTrace();
      } catch (ParseException e) {
         e.printStackTrace();
      }
   }

   private void searchUsingBooleanQuery(String searchQuery1,
      String searchQuery2)throws IOException, ParseException{
      searcher = new Searcher(indexDir);
      long startTime = System.currentTimeMillis();
      //create a term to search file name
      Term term1 = new Term(LuceneConstants.FILE_NAME, searchQuery1);
      //create the term query object
      Query query1 = new TermQuery(term1);

      Term term2 = new Term(LuceneConstants.FILE_NAME, searchQuery2);
      //create the term query object
      Query query2 = new PrefixQuery(term2);

      BooleanQuery query = new BooleanQuery();
      query.add(query1,BooleanClause.Occur.MUST_NOT);
      query.add(query2,BooleanClause.Occur.MUST);

      //do the search
      TopDocs hits = searcher.search(query);
      long endTime = System.currentTimeMillis();

      System.out.println(hits.totalHits +
            " documents found. Time :" + (endTime - startTime) + "ms");
      for(ScoreDoc scoreDoc : hits.scoreDocs) {
         Document doc = searcher.getDocument(scoreDoc);
         System.out.println("File: "+ doc.get(LuceneConstants.FILE_PATH));
      }
      searcher.close();
   }
}

数据和索引目录的创建

从 record1.txt到record10.txt的文件中包含简单的名称以及学生的其他细节，并把它们放在目录E:LuceneData。这是测试数 据。索引目录路径应创建为E:LuceneIndex。期间，运行 Lucene索引程序后- 索引过程中，可以看到该文件夹中创建的索引文件的列表。测试数据请下载：data.zip

运行程序：

一 旦创建源，创造了原始数据，数据目录，索引目录和索引完成后，已经准备好这一步是编译和运行程序。要做到这一点，请LuceneTester.Java文 件选项卡中使用Eclipse IDE可使用Run选项，或使用Ctrl+ F11来编译和运行应用程序LuceneTester。如果您的应用程序一切正常，这将在Eclipse IDE的控制台打印以下消息：

1 documents found. Time :26ms
File: E:LuceneDatarecord10.txt