apache lucene入門　第一章のプログラムをLucene6.5.xで動くようにしてみた

build.gradle

apply plugin: 'java'

repositories {
  jcenter()
}

dependencies {
  compile 'org.apache.lucene:lucene-analyzers-kuromoji:6.5.1'
  compile group: 'org.apache.lucene', name: 'lucene-queryparser', version: '6.5.1'
  testCompile 'junit:junit:4.12'
}

HelloLucene.java

package com.github.masahitojp;

/*
  This program based on Apache Lucene入門
*/

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.ja.JapaneseAnalyzer;
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.queryparser.classic.ParseException;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.RAMDirectory;
import org.apache.lucene.queryparser.classic.QueryParser;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class HelloLucene {
    private static final String  FIELD_CONTENT = "content";
    private static final Directory directory = new RAMDirectory();
    private static final Analyzer analyzer = new JapaneseAnalyzer();
    private static final QueryParser qp = new QueryParser(FIELD_CONTENT, analyzer);

    private static final String[] contents = {
      "カツオはサザエの弟", "サザエはワカメの姉", "ワカメはカツオの妹", "カツオは長男"
    };
    private static void makeIndex() {
        try(final IndexWriter writer = new IndexWriter(directory, new IndexWriterConfig(analyzer))) {
            for (final String content : contents) {
                final Document doc = new Document();
                doc.add(new TextField(FIELD_CONTENT, content, Field.Store.YES));
                writer.addDocument(doc);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    private static void searchIndex(final String q) {
        try (final DirectoryReader ireader = DirectoryReader.open(directory)) {
            final IndexSearcher searcher = new IndexSearcher(ireader);
            Query query = qp.parse(q);
            TopDocs hits = searcher.search(query,10);
            System.out.println(Integer.toString(hits.totalHits) + " 件ヒットしました");
            for(int i =0;i < hits.totalHits; i++) {
                int docId = hits.scoreDocs[i].doc;
                Document doc = searcher.doc(docId);
                System.out.println("\t" + doc.get(FIELD_CONTENT));
            }
        } catch (IOException | ParseException e) {
            e.printStackTrace();
        }
    }
    public static void main(String[] args) throws IOException {
        makeIndex();
        try(BufferedReader br = new BufferedReader(new InputStreamReader(System.in))){
            String q = null;
            while(q==null || !q.equals("q")) {
                System.out.println("\nInput query(if you input \"q\", this will quit) > " );
                System.out.flush();
                q=br.readLine();
              if(!q.equals("q")) {
                  searchIndex(q);
              }
            }
        }
        directory.close();
    }
}