Java tutorial
/* * 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. */ package com.icdd.lucence; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.nio.charset.StandardCharsets; import java.nio.file.Files; import java.nio.file.Paths; import java.util.ArrayList; import java.util.Date; import java.util.List; import org.apache.lucene.analysis.Analyzer; 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.FSDirectory; public class SearchFiles { public SearchFiles() { // } public void searchFiles() { // String index = "F:/download/index/"; // String field = "contents"; // String queries = null; // String queryString = null; int repeat = 0; // ???? boolean raw = false; // ?10? int hitsPerPage = 10; try { IndexReader reader = DirectoryReader.open(FSDirectory.open(Paths.get(index))); IndexSearcher searcher = new IndexSearcher(reader); Analyzer analyzer = new StandardAnalyzer(); BufferedReader in = null; if (queries != null) { in = Files.newBufferedReader(Paths.get(queries), StandardCharsets.UTF_8); } else { in = new BufferedReader(new InputStreamReader(System.in, StandardCharsets.UTF_8)); } QueryParser parser = new QueryParser(field, analyzer); while (true) { if (queryString == null && queries == null) { System.out.println("Enter query:"); } String line = queryString != null ? queryString : in.readLine(); if (line == null || line.length() == -1) { break; } line = line.trim(); if (line.length() == 0) { break; } try { Query query = parser.parse(line); System.out.println("Searching for:" + query.toString(field)); if (repeat > 0) { // repeat & time as benchmark Date start = new Date(); for (int i = 0; i < repeat; i++) { searcher.search(query, 100); } Date end = new Date(); System.out.println("Time: " + (end.getTime() - start.getTime()) + "ms"); } doPagingSearch(in, searcher, query, hitsPerPage, raw, queries == null && queryString == null); } catch (ParseException e) { e.printStackTrace(); } if (queryString != null) { break; } } reader.close(); } catch (IOException e) { e.printStackTrace(); } } public static void doPagingSearch(BufferedReader in, IndexSearcher searcher, Query query, int hitsPerPage, boolean raw, boolean interactive) throws IOException { // Collect enough docs to show 5 pages Date starttime = new Date(); TopDocs results = searcher.search(query, 5 * hitsPerPage); ScoreDoc[] hits = results.scoreDocs; int numTotalHits = results.totalHits; System.out.println(numTotalHits + "total matching documents"); Date endtime = new Date(); System.out.println("one search cost :" + (endtime.getTime() - starttime.getTime()) + "ms"); int start = 0; int end = Math.min(numTotalHits, hitsPerPage); while (true) { if (end > hits.length) { System.out.println("Only results 1 - " + hits.length + " of " + numTotalHits + " total matching documents collected."); System.out.println("Collect more (y/n) ?"); String line = in.readLine(); if (line.length() == 0 || line.charAt(0) == 'n') { break; } hits = searcher.search(query, numTotalHits).scoreDocs; } end = Math.min(hits.length, start + hitsPerPage); for (int i = start; i < end; i++) { if (raw) { System.out.println("doc=" + hits[i].doc + " score=" + hits[i].score); continue; } Document doc = searcher.doc(hits[i].doc); 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:" + title); } } else { System.out.println((i + 1) + ". " + "No path for this document"); } } if (!interactive || end == 0) { break; } if (numTotalHits >= end) { boolean quit = false; while (true) { System.out.print("Press"); if (start - hitsPerPage > 0) { System.out.print("(p)revious page,"); } if (start + hitsPerPage < numTotalHits) { System.out.print("(n)ext page,"); } System.out.println("(q)uit or enter number to jump to a page."); String line = in.readLine(); if (line.length() == 0 || line.charAt(0) == 'q') { quit = true; break; } if (line.charAt(0) == 'p') { start = Math.max(0, start - hitsPerPage); break; } else if (line.charAt(0) == 'n') { if (start + hitsPerPage < numTotalHits) { start += hitsPerPage; } break; } else { int page = Integer.parseInt(line); if ((page - 1) * hitsPerPage < numTotalHits) { start = (page - 1) * hitsPerPage; break; } else { System.out.println("No such page."); } } } if (quit) break; end = Math.min(numTotalHits, start + hitsPerPage); } } } public List<Document> searchFilesWeb(String queryString) { // String index = "F:/download/index/"; // String field = "contents"; int repeat = 0; // ???? boolean raw = false; // ?10? int hitsPerPage = 10; List<Document> docs = new ArrayList<Document>(); try { IndexReader reader = DirectoryReader.open(FSDirectory.open(Paths.get(index))); IndexSearcher searcher = new IndexSearcher(reader); Analyzer analyzer = new StandardAnalyzer(); QueryParser parser = new QueryParser(field, analyzer); if (queryString == null) { System.out.println("Enter query:"); return null; } String line = queryString; line = line.trim(); if (line.length() == 0) { return null; } try { Query query = parser.parse(line); System.out.println("Searching for:" + query.toString(field)); if (repeat > 0) { // repeat & time as benchmark Date start = new Date(); for (int i = 0; i < repeat; i++) { searcher.search(query, 100); } Date end = new Date(); System.out.println("Time: " + (end.getTime() - start.getTime()) + "ms"); } docs = doPagingSearchWeb(docs, searcher, query, hitsPerPage, raw); } catch (ParseException e) { e.printStackTrace(); } reader.close(); } catch (IOException e) { e.printStackTrace(); } return docs; } public static List<Document> doPagingSearchWeb(List<Document> docs, IndexSearcher searcher, Query query, int hitsPerPage, boolean raw) throws IOException { // Collect enough docs to show 5 pages Date starttime = new Date(); TopDocs results = searcher.search(query, 5 * hitsPerPage); ScoreDoc[] hits = results.scoreDocs; int numTotalHits = results.totalHits; System.out.println(numTotalHits + "total matching documents"); Date endtime = new Date(); System.out.println("one search cost :" + (endtime.getTime() - starttime.getTime()) + "ms"); System.out.println("?"); for (ScoreDoc scoreDoc : hits) { docs.add(searcher.doc(scoreDoc.doc)); } return docs; } }