Lucene 3.6.2入门(9) 高级搜索之自定义QueryParser

package com.jadyer.lucene;  

import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;  

import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.NumericField;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
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;  

import com.jadyer.custom.MyQueryParser;  

/**
 * 【Lucene3.6.2入门系列】第09节_高级搜索之自定义QueryParser
 * @create Aug 19, 2013 2:07:32 PM
 * @author 玄玉<http://blog.csdn.net/jadyer>
 */
public class AdvancedSearch {
    private Directory directory;
    private IndexReader reader;  

    public AdvancedSearch(){
        /**文件大小*/
        int[] sizes = {90, 10, 20, 10, 60, 50};
        /**文件名*/
        String[] names = {"Michael.java", "Scofield.ini", "Tbag.txt", "Jack", "Jade", "Jadyer"}; 

        /**文件内容*/
        String[] contents = {"my java blog is http://blog.csdn.net/jadyer",
                             "my Java Website is http://www.jadyer.cn",
                             "my name is jadyer",
                             "I am a Java Developer",
                             "I am from Haerbin",
                             "I like java of Lucene"};
        /**文件日期*/
        Date[] dates = new Date[sizes.length];
        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd HH:mm:ss");
        IndexWriter writer = null;
        Document doc = null;
        try {
            dates[0] = sdf.parse("20130407 15:25:30");
            dates[1] = sdf.parse("20130407 16:30:45");
            dates[2] = sdf.parse("20130213 11:15:25");
            dates[3] = sdf.parse("20130808 09:30:55");
            dates[4] = sdf.parse("20130526 13:54:22");
            dates[5] = sdf.parse("20130701 17:35:34");
            directory = FSDirectory.open(new File("myExample/01_index/"));
            writer = new IndexWriter(directory, new IndexWriterConfig(Version.LUCENE_36, new 

StandardAnalyzer(Version.LUCENE_36)));
            writer.deleteAll();
            for(int i=0; i<sizes.length; i++){
                doc = new Document();
                doc.add(new NumericField("size",Field.Store.YES, true).setIntValue(sizes[i]));
                doc.add(new Field("name", names[i], Field.Store.YES, 

Field.Index.ANALYZED_NO_NORMS));
                doc.add(new Field("content", contents[i], Field.Store.NO, 

Field.Index.ANALYZED));
                doc.add(new NumericField("date", Field.Store.YES, true).setLongValue(dates

[i].getTime()));
                writer.addDocument(doc);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if(null != writer){
                try {
                    writer.close();
                } catch (IOException ce) {
                    ce.printStackTrace();
                }
            }
        }
    }  

    /**
     * 获取IndexReader实例
     */
    private IndexReader getIndexReader(){
        try {
            if(reader == null){
                reader = IndexReader.open(directory);
            }else{
                //if the index was changed since the provided reader was opened, open and return a new reader; else,return null
                //如果当前reader在打开期间index发生改变,则打开并返回一个新的IndexReader,否则返回null
                // http://www.bianceng.cn
                IndexReader ir = IndexReader.openIfChanged(reader);
                if(ir != null){
                    reader.close(); //关闭原reader
                    reader = ir;    //赋予新reader
                }
            }
            return reader;
        }catch(Exception e) {
            e.printStackTrace();
        }
        return null; //发生异常则返回null
    }  

    /**
     * 自定义QueryParser的搜索
     * @param expr 搜索的表达式
     */
    public void searchByCustomQueryParser(String expr){
        IndexSearcher searcher = new IndexSearcher(this.getIndexReader());
        QueryParser parser = new MyQueryParser(Version.LUCENE_36, "content", new StandardAnalyzer(Version.LUCENE_36));
        try {
            Query query = parser.parse(expr);
            TopDocs tds = searcher.search(query, 10);
            for(ScoreDoc sd : tds.scoreDocs){
                Document doc = searcher.doc(sd.doc);
                System.out.print("文档编号=" + sd.doc + "  文档权值=" + doc.getBoost() + "  文档评分=" + sd.score + "    ");
                System.out.println("size=" + doc.get("size") + "  date=" + new SimpleDateFormat("yyyyMMdd HH:mm:ss").format(new Date(Long.parseLong(doc.get("date")))) + "  name=" + doc.get

("name"));
            }
        } catch (ParseException e) {
            System.err.println(e.getMessage());
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if(null != searcher){
                try {
                    searcher.close(); //记得关闭IndexSearcher
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }  

    /**
     * 测试一下搜索效果
     */
    public static void main(String[] args) {
        AdvancedSearch advancedSearch = new AdvancedSearch();
        advancedSearch.searchByCustomQueryParser("name:Jadk~");
        advancedSearch.searchByCustomQueryParser("name:Ja??er");
        System.out.println("------------------------------------------------------------------------");
        advancedSearch.searchByCustomQueryParser("name:Jade");
        System.out.println("------------------------------------------------------------------------");
        advancedSearch.searchByCustomQueryParser("name:[h TO n]");
        System.out.println("------------------------------------------------------------------------");
        advancedSearch.searchByCustomQueryParser("size:[20 TO 80]");
        System.out.println("-------------------------------------------------------------------

-----");
        advancedSearch.searchByCustomQueryParser("date:[20130407 TO 20130701]");
    }
}

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