jlu.search.Searcher.java Source code

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Here is the source code for jlu.search.Searcher.java

Source

package jlu.search;

/**
 * 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 java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import jlu.web.ConstantFactory;
import jlu.web.Tolls;

import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.queryParser.ParseException;
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.Directory;
import org.apache.lucene.store.FSDirectory;
import org.apache.lucene.util.Version;

// From chapter 1

/**
 * This code was originally written for Erik's Lucene intro java.net article
 */
public class Searcher {

    public static void main(String[] args) {
        if (args.length != 2) {
            throw new IllegalArgumentException("Usage: java " + Searcher.class.getName() + " <index dir> <query>");
        }

        String indexDir = args[0]; // 1
        String q = args[1]; // 2
        try {
            searchRetList(indexDir, q, 10);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void search(String indexDir, String q) throws IOException, ParseException {

        Directory dir = FSDirectory.open(new File(indexDir));
        IndexSearcher is = new IndexSearcher(dir);

        QueryParser parser = new QueryParser(Version.LUCENE_30, "contents",
                new StandardAnalyzer(Version.LUCENE_30));
        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("title"));
            System.out.println(doc.get("fullpath"));
        }

        is.close();
    }

    /**
     *   qtopNum autoCompleted
     * @param indexDir
     * @param q
     * @param topNum
     * @return
     * @throws IOException
     * @throws ParseException
     */
    public static List<SearchResultBean> searchRetList(String indexDir, String q, int topNum)
            throws IOException, ParseException {
        List<SearchResultBean> ret = new ArrayList<SearchResultBean>();
        Directory dir = FSDirectory.open(new File(indexDir));
        IndexSearcher is = new IndexSearcher(dir);

        QueryParser parser = new QueryParser(Version.LUCENE_30, "contents",
                new StandardAnalyzer(Version.LUCENE_30));
        Query query = parser.parse(q);
        TopDocs hits = is.search(query, topNum);
        for (ScoreDoc scoreDoc : hits.scoreDocs) {
            Document doc = is.doc(scoreDoc.doc);
            SearchResultBean srb = new SearchResultBean();
            srb.setTitle(doc.get("title"));
            srb.setFullpath(doc.get("fullpath"));
            ret.add(srb);
            Tolls tool = new Tolls();
            srb.setHighlightedAbstract(tool.autoCompl(doc, query, ConstantFactory.AUTO_COMPL_FRAGE_LENGTH));
            ret.add(srb);
        }
        is.close();
        return ret;
    }
}

/*
 * #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
 */