Created
October 30, 2019 11:34
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Lucene Searcher Exercise Code
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| package com.doubleknd26.exercise.lucene.searcher; | |
| /** | |
| * Copyright Manning Publications Co. | |
| * | |
| * Licensed 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 lan | |
| */ | |
| import org.apache.lucene.analysis.standard.StandardAnalyzer; | |
| import org.apache.lucene.document.Document; | |
| import org.apache.lucene.index.DirectoryReader; | |
| import org.apache.lucene.index.IndexReader; | |
| import org.apache.lucene.queryparser.classic.ParseException; | |
| import org.apache.lucene.queryparser.classic.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.Directory; | |
| import org.apache.lucene.store.FSDirectory; | |
| import java.io.IOException; | |
| import java.nio.file.Paths; | |
| /** | |
| * Source code was provided by Lucene in Action, Second Edition. | |
| * https://www.manning.com/books/lucene-in-action-second-edition | |
| * | |
| * This code was originally written for Erik's Lucene intro java.net article. | |
| * Make sure to run this class after creating index using LuceneIndexer. | |
| * Created by doubleknd26 on 2019-01-04. | |
| */ | |
| public class LuceneSearcher { | |
| public static void search(String indexDir, String q) throws IOException, ParseException { | |
| Directory dir = FSDirectory.open(Paths.get(indexDir)); | |
| IndexReader indexReader = DirectoryReader.open(dir); | |
| IndexSearcher is = new IndexSearcher(indexReader); | |
| QueryParser parser = new QueryParser("contents", new StandardAnalyzer()); | |
| Query query = parser.parse(q); | |
| long start = System.currentTimeMillis(); | |
| TopDocs hits = is.search(query, 10); | |
| long end = System.currentTimeMillis(); | |
| System.err.println("Found " + hits.totalHits + | |
| " document(s) (in " + (end - start) + | |
| " milliseconds) that matched query '" + q + "':"); | |
| for(ScoreDoc scoreDoc : hits.scoreDocs) { | |
| Document doc = is.doc(scoreDoc.doc); | |
| System.out.println(doc.get("fullpath")); | |
| } | |
| } | |
| /** | |
| * #1 Parse provided index directory | |
| * #2 Parse provided query string | |
| * #3 Open index | |
| * #4 Parse query | |
| * #5 Search index | |
| * #6 Write search stats | |
| * #7 Retrieve matching document | |
| * #8 Display filename | |
| * #9 Close IndexSearcher | |
| * | |
| * @param args | |
| * @throws Exception | |
| */ | |
| public static void main(String[] args) throws Exception { | |
| final String dir = System.getProperty("user.dir"); | |
| final String indexDir = dir + "/lucene/index"; | |
| // write query here. | |
| String q = "patent"; | |
| search(indexDir, q); | |
| } | |
| } | |
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