com.tistory.devyongsik.demo.SearchFiles.java Source code

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Here is the source code for com.tistory.devyongsik.demo.SearchFiles.java

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package com.tistory.devyongsik.demo;

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.io.File;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
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.FSDirectory;
import org.apache.lucene.util.Version;

/** Simple command-line based search demo. */
public class SearchFiles {

    private SearchFiles() {
    }

    /** Simple command-line based search demo. */
    public static void main(String[] args) throws Exception {

        String index = "/user/need4spd/Java/lucene_index/"; //1.    
        String field = "contents"; //2.    
        String queryString = null; //3.   
        int hitsPerPage = 10; //4.       

        //5.      IndexSearcher .
        IndexSearcher searcher = new IndexSearcher(FSDirectory.open(new File(index)));

        //6.     Analyzer .
        Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_31);

        //7.      Query    QueryParser .
        QueryParser parser = new QueryParser(Version.LUCENE_31, field, analyzer);
        Query query = parser.parse(queryString);

        System.out.println("Query String : " + queryString);
        System.out.println("Query : " + query.toString());
        System.out.println("Searching for: " + query.toString(field));

        //8.  .      .   TF-IDF    .
        TopDocs results = searcher.search(query, 5 * hitsPerPage);
        ScoreDoc[] hits = results.scoreDocs;

        int numTotalHits = results.totalHits;
        System.out.println(numTotalHits + " total matching documents");

        for (int i = 0; i < numTotalHits; i++) {
            System.out.println("doc=" + hits[i].doc + " score=" + hits[i].score); //9.     ...

            Document doc = searcher.doc(hits[i].doc); //10.    .
            String path = doc.get("path");
            if (path != null) {
                System.out.println((i + 1) + ". " + path);
                String title = doc.get("title");
                if (title != null) {
                    System.out.println("   Title: " + doc.get("title"));
                }
            } else {
                System.out.println((i + 1) + ". " + "No path for this document");
            }
        }

        searcher.close();
    }
}