Lucene6去掉了Filter但是可以用BooleanQuery实现Filter查询

Posted 2020-09-30 JetHu

Lucene在6.0版本之后彻底废除了Filter的使用，采用BooleanQuery来实现Filter的功能，核心代码如下：

       TermQuery termQuery = new TermQuery(new Term("content","长"));
        TermQuery termQuery1 = new TermQuery(new Term("content","格"));

         BooleanQuery.Builder builder = new BooleanQuery.Builder();//构造booleanQuery
        builder.add(termQuery, BooleanClause.Occur.FILTER);   //BooleanClause.Occur.FILTER 设置为过滤，这个termQuery包含的就相当于Filter
        builder.add(termQuery1, BooleanClause.Occur.FILTER);//这个同上，也就是可以添加多个Filter

（对Lucene6之前的Filter不够熟悉的请看这个：http://www.cnblogs.com/forfuture1978/archive/2010/05/19/1738805.html）

 

下面给出具体代码，大家可以试一试：

 

package Query;

import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.TextField;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.*;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;

import java.io.IOException;
import java.nio.file.Paths;

/**
 * Created by jet on 2017/7/31.
 */
public class BooleanQueryTest {
    public static void main(String[] args) throws IOException {

        index();
        search();
    }

    public  static void search() throws IOException {
        Directory dir = FSDirectory.open(Paths.get("booleanIndex"));
        IndexSearcher searcher = new IndexSearcher(DirectoryReader.open(dir));

        TermQuery termQuery = new TermQuery(new Term("content","长"));
        TermQuery termQuery1 = new TermQuery(new Term("content","格"));

        long start = System.currentTimeMillis();
        //construct a boolean query to test filter function.
        BooleanQuery.Builder builder = new BooleanQuery.Builder();
        //booleanQuery 中使用filter查询也可以让该部分的查询结果不参与打分
        builder.add(termQuery, BooleanClause.Occur.FILTER);
        builder.add(termQuery1, BooleanClause.Occur.FILTER);
        BooleanQuery booleanQuery = builder.build();

        TopDocs hits = searcher.search(booleanQuery,10);
        long end = System.currentTimeMillis();
        System.out.println("totalhits: " + hits.totalHits);
        System.out.println("How long it takes to search: "+(end-start));
        for (ScoreDoc scoredoc:hits.scoreDocs
                ) {
            Document doc = searcher.doc(scoredoc.doc);
            System.out.println("score: "+ scoredoc.score);
            System.out.println("getFields: "+doc.get("content"));
            System.out.println(doc.get("FileName"));

        }
    }

    public static  void index() throws IOException {
        String str ="权声明：本文为博主原创文章，未经博主允许不得转载。\\n" ;
        String str1= "作为一个合格的程序员，往往是能够很好的管理自己的程序的，尤其是对于长期处于纯研发中心，甚至软件园的程序员朋友们，无论是上班还是下班，甚至课外活动，碰到的都是具有相同思维的人群，进而容易觉得好像大部分人都是相同的思维方式。因而当程序员成为管理者后，往往习惯于将程序员当做程序一样进行管理。\\n" +
                "\\n" + "然而程序员不是程序，是有血有肉的人，所以也呈现出很多与程序不同";
        String str2="首先，程序是有确定的输入和输出的，一般对于特定的输入，一定会得到特定的输出，一般规定了输入输出，也就确定了接口，对其中的具体实现不用关心，对于成熟的公共模块，也不用担心其维护，可放心的使用，达到一劳永逸的效 ";
        String str3=  " 而程序员不是，不是任何对程序员的输入，都会带来特定的输出的。";
        String str4= "无论是源代码维护，文档，持续集成，设计模式，架构等，很多都深入程序员的思想中，甚至成为日常生活中的一种思维方式。";
        Directory dir = FSDirectory.open(Paths.get("booleanIndex"));
//        Directory dir = new  RAMDirectory();
        StandardAnalyzer analyzer = new StandardAnalyzer();
        IndexWriterConfig config = new IndexWriterConfig(analyzer);
        config.setOpenMode(IndexWriterConfig.OpenMode.CREATE_OR_APPEND);
        IndexWriter writer = new IndexWriter(dir,config);
        Document document = new Document();
        Document document1 = new Document();
        Document document2 = new Document();
        Document document3 = new Document();
        Document document4 = new Document();
        document.add(new Field("content",str, TextField.TYPE_STORED));
        document1.add(new Field("content",str1, TextField.TYPE_STORED));
        document2.add(new Field("content",str2, TextField.TYPE_STORED));
        document3.add(new Field("content",str3, TextField.TYPE_STORED));
        document4.add(new Field("content",str4, TextField.TYPE_STORED));
        writer.addDocument(document);
        writer.addDocument(document1);
        writer.addDocument(document2);
        writer.addDocument(document3);
        writer.addDocument(document4);
        writer.close();
    }
}