Lucene 基础教程

Lucene StandardAnalyzer类
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Lucene排序

在本章中，我们将研究的排序顺序默认情况下，在给出的Lucene搜索结果或可根据需要进行操作。

按相关性排序

这是使用Lucene的默认排序方式。 Lucene通过在顶部的最相关的命中提供的结果。


private void sortUsingRelevance(String searchQuery)
   throws IOException, ParseException{
   searcher = new Searcher(indexDir);
   long startTime = System.currentTimeMillis();
   //create a term to search file name
   Term term = new Term(LuceneConstants.FILE_NAME, searchQuery);
   //create the term query object
   Query query = new FuzzyQuery(term);
   searcher.setDefaultFieldSortScoring(true, false);
   //do the search
   TopDocs hits = searcher.search(query,Sort.RELEVANCE);
   long endTime = System.currentTimeMillis();

   System.out.println(hits.totalHits +
      " documents found. Time :" + (endTime - startTime) + "ms");
   for(ScoreDoc scoreDoc : hits.scoreDocs) {
      Document doc = searcher.getDocument(scoreDoc);
      System.out.print("Score: "+ scoreDoc.score + " ");
      System.out.println("File: "+ doc.get(LuceneConstants.FILE_PATH));
   }
   searcher.close();
}

选择IndexOrder排序方式

这被分拣使用lucene模式，其中索引第一文档示出第一搜索结果中。


private void sortUsingIndex(String searchQuery)
   throws IOException, ParseException{
   searcher = new Searcher(indexDir);
   long startTime = System.currentTimeMillis();
   //create a term to search file name
   Term term = new Term(LuceneConstants.FILE_NAME, searchQuery);
   //create the term query object
   Query query = new FuzzyQuery(term);
   searcher.setDefaultFieldSortScoring(true, false);
   //do the search
   TopDocs hits = searcher.search(query,Sort.INDEXORDER);
   long endTime = System.currentTimeMillis();

   System.out.println(hits.totalHits +
      " documents found. Time :" + (endTime - startTime) + "ms");
   for(ScoreDoc scoreDoc : hits.scoreDocs) {
      Document doc = searcher.getDocument(scoreDoc);
      System.out.print("Score: "+ scoreDoc.score + " ");
      System.out.println("File: "+ doc.get(LuceneConstants.FILE_PATH));
   }
   searcher.close();
}

应用程序示例...

让我们创建一个测试Lucene的应用程序来测试分选过程。

步骤 描述
1 创建下名称为LuceneFirstApplication的一个项目作为解释Lucene的应用在包packagecom.yiibai.lucene下，在第一个应用程序的篇章。也可以使用Lucene创建的项目理解搜索过程。
2 创建LuceneConstants.java和Searcher.java作为Lucene的解释- 第一应用程序一章。保持其它文件不变。
3 创建LuceneTester.java如下所述。
4 清理和构建应用程序，以确保业务逻辑按要求工作。

LuceneConstants.java

这个类是用来提供可应用于示例应用程序中使用的各种常量。


package com.yiibai.lucene;

public class LuceneConstants {
   public static final String CONTENTS="contents";
   public static final String FILE_NAME="filename";
   public static final String FILE_PATH="filepath";
   public static final int MAX_SEARCH = 10;
}

Searcher.java

这个类用来读取就使用Lucene库的原始数据，并搜索数据的索引。


package com.yiibai.lucene;

import java.io.File;
import java.io.IOException;

import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.index.CorruptIndexException;
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.Sort;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
import org.apache.lucene.util.Version;

public class Searcher {
	
IndexSearcher indexSearcher;
   QueryParser queryParser;
   Query query;

   public Searcher(String indexDirectoryPath) throws IOException{
      Directory indexDirectory 
         = FSDirectory.open(new File(indexDirectoryPath));
      indexSearcher = new IndexSearcher(indexDirectory);
      queryParser = new QueryParser(Version.LUCENE_36,
         LuceneConstants.CONTENTS,
         new StandardAnalyzer(Version.LUCENE_36));
   }

   public TopDocs search( String searchQuery) 
      throws IOException, ParseException{
      query = queryParser.parse(searchQuery);
      return indexSearcher.search(query, LuceneConstants.MAX_SEARCH);
   }

   public TopDocs search(Query query) 
      throws IOException, ParseException{
      return indexSearcher.search(query, LuceneConstants.MAX_SEARCH);
   }

   public TopDocs search(Query query,Sort sort) 
      throws IOException, ParseException{
      return indexSearcher.search(query, 
         LuceneConstants.MAX_SEARCH,sort);
   }

   public void setDefaultFieldSortScoring(boolean doTrackScores, 
      boolean doMaxScores){
      indexSearcher.setDefaultFieldSortScoring(
         doTrackScores,doMaxScores);
   }

   public Document getDocument(ScoreDoc scoreDoc) 
      throws CorruptIndexException, IOException{
      return indexSearcher.doc(scoreDoc.doc);	
   }

   public void close() throws IOException{
      indexSearcher.close();
   }
}

LuceneTester.java

这个类是用来测试Lucene库的搜索能力。


package com.yiibai.lucene;

import java.io.IOException;

import org.apache.lucene.document.Document;
import org.apache.lucene.index.Term;
import org.apache.lucene.queryParser.ParseException;
import org.apache.lucene.search.FuzzyQuery;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.Sort;
import org.apache.lucene.search.TopDocs;

public class LuceneTester {
	
   String indexDir = "E:\Lucene\Index";
   String dataDir = "E:\Lucene\Data";
   Indexer indexer;
   Searcher searcher;

   public static void main(String[] args) {
      LuceneTester tester;
      try {
          tester = new LuceneTester();
          tester.sortUsingRelevance("cord3.txt");
          tester.sortUsingIndex("cord3.txt");
      } catch (IOException e) {
          e.printStackTrace();
      } catch (ParseException e) {
          e.printStackTrace();
      }		
   }

   private void sortUsingRelevance(String searchQuery)
      throws IOException, ParseException{
      searcher = new Searcher(indexDir);
      long startTime = System.currentTimeMillis();
      //create a term to search file name
      Term term = new Term(LuceneConstants.FILE_NAME, searchQuery);
      //create the term query object
      Query query = new FuzzyQuery(term);
      searcher.setDefaultFieldSortScoring(true, false);
      //do the search
      TopDocs hits = searcher.search(query,Sort.RELEVANCE);
      long endTime = System.currentTimeMillis();

      System.out.println(hits.totalHits +
         " documents found. Time :" + (endTime - startTime) + "ms");
      for(ScoreDoc scoreDoc : hits.scoreDocs) {
         Document doc = searcher.getDocument(scoreDoc);
         System.out.print("Score: "+ scoreDoc.score + " ");
         System.out.println("File: "+ doc.get(LuceneConstants.FILE_PATH));
      }
      searcher.close();
   }

   private void sortUsingIndex(String searchQuery)
      throws IOException, ParseException{
      searcher = new Searcher(indexDir);
      long startTime = System.currentTimeMillis();
      //create a term to search file name
      Term term = new Term(LuceneConstants.FILE_NAME, searchQuery);
      //create the term query object
      Query query = new FuzzyQuery(term);
      searcher.setDefaultFieldSortScoring(true, false);
      //do the search
      TopDocs hits = searcher.search(query,Sort.INDEXORDER);
      long endTime = System.currentTimeMillis();

      System.out.println(hits.totalHits +
      " documents found. Time :" + (endTime - startTime) + "ms");
      for(ScoreDoc scoreDoc : hits.scoreDocs) {
         Document doc = searcher.getDocument(scoreDoc);
         System.out.print("Score: "+ scoreDoc.score + " ");
         System.out.println("File: "+ doc.get(LuceneConstants.FILE_PATH));
      }
      searcher.close();
   }
}

数据和索引目录的创建

从record1.txt到record10.txt的文件中包含简单的名称以及学生的其他细节，并把它们放在目录E:LuceneData。这是测试数据。索引目录路径应创建为E:LuceneIndex。期间，运行 Lucene索引程序后- 索引过程中，可以看到该文件夹中创建的索引文件的列表。

运行程序：

一旦创建源，创造了原始数据，数据目录，索引目录和索引完成后，已经准备好这一步是编译和运行程序。要做到这一点，请LuceneTester.Java文件选项卡中使用Eclipse IDE可使用Run选项，或使用Ctrl+ F11来编译和运行应用程序LuceneTester。如果您的应用程序一切正常，这将在Eclipse IDE的控制台打印以下消息：

10 documents found. Time :31ms
Score: 1.3179655 File: E:LuceneData
ecord3.txt
Score: 0.790779 File: E:LuceneData
ecord1.txt
Score: 0.790779 File: E:LuceneData
ecord2.txt
Score: 0.790779 File: E:LuceneData
ecord4.txt
Score: 0.790779 File: E:LuceneData
ecord5.txt
Score: 0.790779 File: E:LuceneData
ecord6.txt
Score: 0.790779 File: E:LuceneData
ecord7.txt
Score: 0.790779 File: E:LuceneData
ecord8.txt
Score: 0.790779 File: E:LuceneData
ecord9.txt
Score: 0.2635932 File: E:LuceneData
ecord10.txt
10 documents found. Time :0ms
Score: 0.790779 File: E:LuceneData
ecord1.txt
Score: 0.2635932 File: E:LuceneData
ecord10.txt
Score: 0.790779 File: E:LuceneData
ecord2.txt
Score: 1.3179655 File: E:LuceneData
ecord3.txt
Score: 0.790779 File: E:LuceneData
ecord4.txt
Score: 0.790779 File: E:LuceneData
ecord5.txt
Score: 0.790779 File: E:LuceneData
ecord6.txt
Score: 0.790779 File: E:LuceneData
ecord7.txt
Score: 0.790779 File: E:LuceneData
ecord8.txt
Score: 0.790779 File: E:LuceneData
ecord9.txt

Lucene StandardAnalyzer类