lucene7.3.1 多个field时，用MultiFieldQueryParser实现筛选式搜索

package com.rokid.server.framework.test;

import java.io.IOException; import java.nio.file.Paths; import java.util.ArrayList; import java.util.List;

import org.apache.lucene.index.IndexReader; import org.apache.lucene.analysis.cn.smart.SmartChineseAnalyzer; 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.IndexWriterConfig.OpenMode; import org.apache.lucene.queryparser.classic.MultiFieldQueryParser; import org.apache.lucene.queryparser.classic.ParseException; import org.apache.lucene.search.BooleanClause.Occur; 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.search.similarities.BM25Similarity; import org.apache.lucene.store.FSDirectory; import org.apache.lucene.store.IOContext; import org.apache.lucene.store.RAMDirectory;

public class Example {

    public static IndexWriter writer;     public static RAMDirectory idxDir;     public static SmartChineseAnalyzer analyzer;

    public static void makeIndex() throws IOException {

        FSDirectory fsDir = FSDirectory.open(Paths.get("C:\\Users\\gt\\Desktop\\_ROKID_\\fast-sent-match\\example"));         idxDir = new RAMDirectory(fsDir, IOContext.DEFAULT);         analyzer = new SmartChineseAnalyzer();         IndexWriterConfig iwc = new IndexWriterConfig(analyzer);         iwc.setSimilarity(new BM25Similarity());

        iwc.setOpenMode(OpenMode.CREATE);         writer = new IndexWriter(idxDir, iwc);

        List listSent = new ArrayList();         listSent.add("战旗春秋是最好玩的战棋游戏");         listSent.add("金古江湖是最好玩的金庸游戏");         for (String sent : listSent) {             Document doc = new Document();             doc.add(new TextField("questionID", String.valueOf(1), Field.Store.YES));             doc.add(new TextField("question", sent.trim(), Field.Store.YES));             writer.addDocument(doc);         }

        List listSent2 = new ArrayList();         listSent2.add("战旗春秋是最好玩的手机游戏");         listSent2.add("金古江湖是最好玩的角色扮演游戏");         for (String sent : listSent2) {             Document doc = new Document();             doc.add(new TextField("questionID", String.valueOf(2), Field.Store.YES));             doc.add(new TextField("question", sent.trim(), Field.Store.YES));             writer.addDocument(doc);         }

        writer.commit();

        int nMaxDoc = writer.maxDoc();         System.out.println("nMaxDoc = " + nMaxDoc);         writer.close();     }

    public static void main(String[] args) throws IOException, ParseException {         makeIndex();

        // String[] stringQuery={"2","金古江湖"}; //通过1,2来筛选         String[] stringQuery = { "1", "金古江湖" };         String[] fields = { "questionID", "question" };         Occur[] occ = { Occur.MUST, Occur.MUST };         Query query = MultiFieldQueryParser.parse(stringQuery, fields, occ, analyzer);

        TopDocs results = null;         IndexReader reader = DirectoryReader.open(idxDir);         IndexSearcher searcher = new IndexSearcher(reader);         results = searcher.search(query, 3);         ScoreDoc[] hits = results.scoreDocs;         for (int i = 0; i < hits.length; ++i) {             Document doc = searcher.doc(hits[i].doc);             String strDocSent = doc.get("question");             System.out.println(strDocSent);         }     } }