首页 > 代码库 > Lucene实践之SearchFile

Lucene实践之SearchFile

上一篇学习了构建索引,这一篇来检索索引,同样是基础的用法。

准备工作

参考文档

      1) http://lucene.apache.org/core/4_9_0/demo/src-html/org/apache/lucene/demo/SearchFiles.html

依赖jar包

  上篇Lucene实践之SearchFile中的jar包即可。

主要的类

  1) IndexReader , 读取索引文件

  2) IndexSearcher , 核心类执行检索

  3) QueryParser , 用于解析用户查询词

  4) Analyzer , 分词器,最好是与构建索引用一样的

牛刀小试

searchFile

 1 package lucene; 2  3 import java.io.File; 4 import java.io.IOException; 5  6 import org.apache.lucene.analysis.Analyzer; 7 import org.apache.lucene.analysis.standard.StandardAnalyzer; 8 import org.apache.lucene.document.Document; 9 import org.apache.lucene.index.DirectoryReader;10 import org.apache.lucene.index.IndexReader;11 import org.apache.lucene.queryparser.classic.ParseException;12 import org.apache.lucene.queryparser.classic.QueryParser;13 import org.apache.lucene.search.IndexSearcher;14 import org.apache.lucene.search.Query;15 import org.apache.lucene.search.ScoreDoc;16 import org.apache.lucene.search.TopDocs;17 import org.apache.lucene.store.FSDirectory;18 import org.apache.lucene.util.Version;19 20 public class Searcher {21     public static IndexSearcher indexSearcher;22     public static void search(String index,String queryStr) throws IOException, ParseException {23         long start = System.currentTimeMillis();24         IndexReader indexReader = DirectoryReader.open(FSDirectory.open(new File(index)));//读取索引25         indexSearcher = new IndexSearcher(indexReader);26         Analyzer anlyzer = new StandardAnalyzer(Version.LUCENE_46);//分词器27         QueryParser parser = new QueryParser(Version.LUCENE_46, "content", anlyzer);//解析查询,"content"指定了查找的域(Field)28         Query query = parser.parse(queryStr);29         TopDocs results = indexSearcher.search(query, 10);//返回10条结果30         ScoreDoc[] hits = results.scoreDocs;31         int totalHits = results.totalHits;32         for(int i = 0; i < totalHits; i++) {33             Document doc = indexSearcher.doc(hits[i].doc);34             System.out.println("["+doc.get("name")+"] " + doc.get("path"));35             System.out.println();36         }37         long end = System.currentTimeMillis();38         System.out.println("共找到"+totalHits+"条结果,耗时:"+(end-start)+"ms");39     }40     public static void main(String[] args) throws IOException, ParseException {41         search("E:/data/index", "never");42     }43 }

结果显示

[nevergrowold.txt] E:\data\data2\nevergrowold.txt共找到1条结果,耗时:143ms