发布于 2015-07-25 11:19:53 | 351 次阅读 | 评论: 0 | 来源: 网络整理
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。
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();
}
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();
}
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();
}
}
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。
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:LuceneDatarecord3.txt
Score: 0.790779 File: E:LuceneDatarecord1.txt
Score: 0.790779 File: E:LuceneDatarecord2.txt
Score: 0.790779 File: E:LuceneDatarecord4.txt
Score: 0.790779 File: E:LuceneDatarecord5.txt
Score: 0.790779 File: E:LuceneDatarecord6.txt
Score: 0.790779 File: E:LuceneDatarecord7.txt
Score: 0.790779 File: E:LuceneDatarecord8.txt
Score: 0.790779 File: E:LuceneDatarecord9.txt
Score: 0.2635932 File: E:LuceneDatarecord10.txt
10 documents found. Time :0ms
Score: 0.790779 File: E:LuceneDatarecord1.txt
Score: 0.2635932 File: E:LuceneDatarecord10.txt
Score: 0.790779 File: E:LuceneDatarecord2.txt
Score: 1.3179655 File: E:LuceneDatarecord3.txt
Score: 0.790779 File: E:LuceneDatarecord4.txt
Score: 0.790779 File: E:LuceneDatarecord5.txt
Score: 0.790779 File: E:LuceneDatarecord6.txt
Score: 0.790779 File: E:LuceneDatarecord7.txt
Score: 0.790779 File: E:LuceneDatarecord8.txt
Score: 0.790779 File: E:LuceneDatarecord9.txt