Lucene5多条件查询

lucene是一个很强大的搜索工具，最近公司项目上用到，结合JAVA1234所讲，对多条件查询做出总结

先描述一下我的多条件需求，如果和您的类似，继续往下看。

1、我的Lucene搜索会在很多地方使用，使用时的条件各不相同

2、只建立一份索引

使用的工具包（点我下载）：

一、创建索引文件

import java.io.File;
import java.io.FileReader;
import java.nio.file.Paths;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.TextField;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
import org.wltea.analyzer.lucene.IKAnalyzer;

public class LuceneCreateIndex
{
   private IndexWriter indexWriter = null;

   public LuceneCreateIndex( String indexDir ) throws Exception
   {
      // IKAnalyzer 有独特之处，同时支持多种语言的分词
      Analyzer analyzer = new IKAnalyzer();
      Directory directory = FSDirectory.open( Paths.get( indexDir ) );
      IndexWriterConfig indexWriterConfig = new IndexWriterConfig( analyzer );
      indexWriter = new IndexWriter( directory, indexWriterConfig );
   }

   /**
    * 将测试数据文件写入索引
    * @param dataDir
    * @throws Exception
    */
   public void createIndex( String dataDir ) throws Exception
   {
      File[] files = new File( dataDir ).listFiles();
      for ( File file : files )
      {
         Document document = getDocument( file );
         indexWriter.addDocument( document );
         System.out.println( "已建立索引文件:" + file.getCanonicalPath() );
      }
      indexWriter.close();
   }

   public Document getDocument( File file ) throws Exception
   {
      Document document = new Document();
      document.add( new TextField( "contents", new FileReader( file ) ) );
      document.add( new TextField( "fileName", file.getName(), Field.Store.YES ) );
      document.add( new TextField( "fullPath", file.getCanonicalPath(), Field.Store.YES ) );
      return document;
   }

   public static void main( String[] args )
   {
      String indexDir = "D:\\luceneTest";// 索引文件生成目录
      String dataDir = "D:\\luceneTest\\data";// 测试数据目录（测试数据见下图）
      try
      {
         new LuceneCreateIndex( indexDir ).createIndex( dataDir );
      }
      catch ( Exception e )
      {
         e.printStackTrace();
      }
   }
}

运行生成索引文件；测试数据如下

2、测试搜索效果

import java.nio.file.Paths;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.queryparser.classic.QueryParser;
import org.apache.lucene.search.BooleanClause.Occur;
import org.apache.lucene.search.BooleanQuery;
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.wltea.analyzer.lucene.IKAnalyzer;

public class LuceneTestSearch
{
   /**
    * 单条件查询
    * @param indexDir
    * @param q
    * @throws Exception
    */
   public static void search( String indexDir, String q ) throws Exception
   {
      Directory directory = FSDirectory.open( Paths.get( indexDir ) );
      IndexReader indexReader = DirectoryReader.open( directory );
      IndexSearcher indexSearcher = new IndexSearcher( indexReader );
      Analyzer analyzer = new IKAnalyzer();
      // 搜索目标是 contents
      QueryParser parser = new QueryParser( "contents", analyzer );
      // 传入关键字，进行分析
      Query query = parser.parse( q );
      // 分页，这里取前十个
      TopDocs topDocs = indexSearcher.search( query, 10 );

      for ( ScoreDoc scoreDoc : topDocs.scoreDocs )
      {
         // 获取搜索结果
         Document document = indexSearcher.doc( scoreDoc.doc );
         System.out.println( document.get( "fullPath" ) );
      }

      indexReader.close();
   }

   /**
    * 多条件查询
    * @param indexDir
    * @param q
    * @throws Exception
    */
   public static void searchBooleanQuery( String indexDir, String q ) throws Exception
   {
      Directory directory = FSDirectory.open( Paths.get( indexDir ) );
      IndexReader indexReader = DirectoryReader.open( directory );
      IndexSearcher indexSearcher = new IndexSearcher( indexReader );
      Analyzer analyzer = new IKAnalyzer();
      // 多条件必备神器
      BooleanQuery.Builder builder = new BooleanQuery.Builder();
      // 实际使用中一般是多目标搜索（根据 姓名、性别、年龄、学校等等），
      //QueryParser parser = new MultiFieldQueryParser( new String[]{"contents","fullPath"}, analyzer );
      // 条件一
      QueryParser parser = new QueryParser( "contents", analyzer );
      Query query = parser.parse( q );
      // contents必须含有条件一
      builder.add( query, Occur.MUST );
      // 条件二
      QueryParser parser1 = new QueryParser( "fileName", analyzer );
      Query query1 = parser1.parse( "b c" );
      // fileName必须不能是 b 和 c
      builder.add( query1, Occur.MUST_NOT );

      TopDocs topDocs = indexSearcher.search( builder.build(), 10 );

      for ( ScoreDoc scoreDoc : topDocs.scoreDocs )
      {
         Document document = indexSearcher.doc( scoreDoc.doc );
         System.out.println( document.get( "fullPath" ) );
      }
      indexReader.close();
   }

   public static void main( String[] args )
   {
      String indexDir = "D:\\luceneTest";
      String q = "1";
      try
      {
         // 搜索contents含有1的文件信息
         System.out.println( "单条件查询：" );
         search( indexDir, q );
         // 搜索contents含有1 但是除开文件b 和  c
         System.out.println( "多条件查询：" );
         searchBooleanQuery( indexDir, q );
      }
      catch ( Exception e )
      {
         e.printStackTrace();
      }
   }
}

搜索结果如下

单条件查询：
D:\luceneTest\data\d.txt
D:\luceneTest\data\b.txt
D:\luceneTest\data\c.txt
D:\luceneTest\data\a.txt
多条件查询：
D:\luceneTest\data\d.txt
D:\luceneTest\data\a.txt

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