Lucene4.7.2实例之用索引搜索文件

上一篇写完了创建索引的过程，这篇写用索引搜索文件，环境window64+jdk1.6+lucene4.7.2（lucene4.8要求jdk1.7）

步骤：

1.创建Directory对象，即索引文件夹

2.创建IndexReader对象，读取索引文件夹

3.创建IndexSearch对象，建立索引查询

4.创建QueryParser对象

5.把查询的值通过QueryParser对象转Query对象

6.创建TopDocs对象

7.用TopDocs对象根据Query对象查询

8.关闭IndexReader对象

import java.io.BufferedReader;

import java.io.File;

import java.io.FileInputStream;

import java.io.IOException;

import java.io.InputStreamReader;

import java.util.Date;

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;

import org.apache.lucene.util.Version;

public class SearchFiles {

    @SuppressWarnings("unused")

    public SearchFiles() throws IOException, ParseException {

String indexPath = "D:\\lucene-test\\index";

String field = "contents";

String queries = null;

int repeat = 0;

boolean raw = false;

String queryString = null;

int hitsPerPage = 10;

IndexReader reader = DirectoryReader.open(FSDirectory.open(new File(indexPath)));

IndexSearcher searcher = new IndexSearcher(reader);

// :Post-Release-Update-Version.LUCENE_XY:

Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_47);

BufferedReader in = null;

if (queries != null) {

   in = new BufferedReader(new InputStreamReader(new FileInputStream(queries), "UTF-8"));

} else {

   in = new BufferedReader(new InputStreamReader(System.in, "UTF-8"));

}

// :Post-Release-Update-Version.LUCENE_XY:

QueryParser parser = new QueryParser(Version.LUCENE_47, field, analyzer);

while (true) {

   if (queries == null && queryString == null) { // prompt the user

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;

   }

   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, null, 100);

}

Date end = new Date();

System.out.println("Time: " + (end.getTime() - start.getTime()) + "ms");

   }

   doPagingSearch(in, searcher, query, hitsPerPage, raw, queries == null && queryString == null);

   if (queryString != null) {

break;

   }

}

reader.close();

    }

    private void doPagingSearch(BufferedReader in, IndexSearcher searcher, Query query, int hitsPerPage, boolean raw, boolean b) throws IOException {

// Collect enough docs to show 5 pages

TopDocs results = searcher.search(query, 5 * hitsPerPage);

ScoreDoc[] hits = results.scoreDocs;

int numTotalHits = results.totalHits;

System.out.println(numTotalHits + " total matching documents");

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) { // output raw format

   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: " + doc.get("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 static void main(String[] args) {

try {

   new SearchFiles();

} catch (IOException e) {

   e.printStackTrace();

} catch (ParseException e) {

   e.printStackTrace();

}

    }

}