4.Lucene3.案例介绍，创建索引，查询等操作验证



1. 案例：

Article.java

package cn.toto.lucene.quickstart;

publicclassArticle
{

privateintid;

private
Stringtitle;

private
Stringcontent;

/**

*
@return the id

*/

publicint
getId() {

returnid;

}

/**

*
@param id the id to set

*/

publicvoid
setId(int id) {

this.id
= id;

}

/**

*
@return the title

*/

public
String getTitle() {

returntitle;

}

/**

*
@param title the title to set

*/

publicvoid
setTitle(String title) {

this.title
= title;

}

/**

*
@return the content

*/

public
String getContent() {

returncontent;

}

/**

*
@param content the content to set

*/

publicvoid
setContent(String content) {

this.content
= content;

}

}

工具类Configuration.java

package cn.toto.lucene.util;

import java.io.File;

import org.apache.lucene.analysis.Analyzer;

import org.apache.lucene.analysis.standard.StandardAnalyzer;

import org.apache.lucene.store.Directory;

import org.apache.lucene.store.FSDirectory;

import org.apache.lucene.util.Version;

/**

* @brief Configuration.java配置对象，提供Lucene需要  索引目录，分词器

* @attention

* @author toto

* @date 2014-12-7

* @note begin modify by涂作权

*/

public class Configuration {

private static Directory directory;

private static Analyzer analyzer;

private static Version version;

static {

try {

//设置磁盘目录，表示的是本地index目录

directory = FSDirectory.open(new File("index"));

} catch (Exception e) {

e.printStackTrace();

}

//表示LUCENE版本

version = Version.LUCENE_36;

//表示使用版本

analyzer = new StandardAnalyzer(version);

}

//提供目录

public static Directory getDirectory()

{

return directory;

}

//提供分词器

public static Analyzer getAnalyzer()

{

return analyzer;

}

//获取版本

public static Version getVersion()

{

return version;

}

}

工具类LuceneUtils.java

package cn.toto.lucene.util;

import java.io.IOException;

import org.apache.lucene.index.CorruptIndexException;

import org.apache.lucene.index.IndexReader;

import org.apache.lucene.index.IndexWriter;

import org.apache.lucene.index.IndexWriterConfig;

import org.apache.lucene.search.IndexSearcher;

// lucene工具类

public class LuceneUtils {

private static IndexWriter indexWriter;

static {

//
索引目录位置

try {

//
写入索引

IndexWriterConfig indexWriterConfig = new IndexWriterConfig(

Configuration.getVersion(), Configuration.getAnalyzer());

indexWriter = new IndexWriter(Configuration.getDirectory(),

indexWriterConfig);

//
绑定虚拟机退出事件，关闭IndexWriter

Runtime.getRuntime().addShutdownHook(new Thread() {

@Override

public void run() {

try {

indexWriter.close();

} catch (CorruptIndexException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

}

});

} catch (IOException e) {

e.printStackTrace();

}

}

//
提供获取IndexWriter对象

public static IndexWriter getIndexWriter() {

return indexWriter;

}

//
获得查询IndexSeacher对象

public static IndexSearcher getIndexSearcher() throws Exception {

return new IndexSearcher(IndexReader.open(Configuration.getDirectory()));

}

}

LuceneTest.java

package cn.toto.lucene.api;

import java.io.File;

importjava.io.IOException;

import org.apache.lucene.analysis.Analyzer;

import org.apache.lucene.analysis.standard.StandardAnalyzer;

import org.apache.lucene.document.Document;

import org.apache.lucene.document.Field;

import org.apache.lucene.document.Field.Store;

import org.apache.lucene.index.CorruptIndexException;

import org.apache.lucene.index.IndexReader;

import org.apache.lucene.index.IndexWriter;

import org.apache.lucene.index.IndexWriterConfig;

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.store.LockObtainFailedException;

import org.apache.lucene.store.RAMDirectory;

import org.apache.lucene.util.Version;

import org.junit.Test;

import cn.toto.lucene.quickstart.Article;

import cn.toto.lucene.util.LuceneUtils;

// API详细分析

publicclass
LuceneTest {

@Test

//使用LuceneUtils解决
IndexWriter并发问题

@SuppressWarnings("unused")

publicvoid
testLock2() {

IndexWriter indexWriter2 = LuceneUtils.getIndexWriter();

IndexWriter indexWriter1 = LuceneUtils.getIndexWriter();

}

@Test

@SuppressWarnings("all")

//使用两个IndexWrtier报错，锁使用问题

publicvoid
testLock()throws CorruptIndexException,

LockObtainFailedException,
IOException {

//索引目录位置

Directory directory = FSDirectory.open(new
File("index"));//当前工程index目录

//分词器

Analyzer analyzer =
new StandardAnalyzer(Version.LUCENE_36);

//写入索引

IndexWriterConfig indexWriterConfig =
new IndexWriterConfig(

Version.LUCENE_36,
analyzer);

IndexWriter indexWriter =
new IndexWriter(directory, indexWriterConfig);

IndexWriterConfig indexWriterConfig2 =
new IndexWriterConfig(

Version.LUCENE_36,
analyzer);

IndexWriter indexWriter2 =
new IndexWriter(directory,

indexWriterConfig2);

}

上面的运行结果如下：

@Test

//测试Store和
Index

/*

* Store.YES
存储、Store.NO不存储
Index.NO不建立索引 Index.ANALYZED分词建立索引

* Index.NOT_ANALYZED
不分词建立索引Index.ANALYZED_NO_NORMS
分词建立索引，不存放权重信息

* Index.NOT_ANALYZED_NO_NORMS
不分词建立索引，不存放权重信息

*/

publicvoid
testIndex()throws Exception {

//需要建立索引目标数据

Article article =
new Article();

article.setId(100);

article.setTitle("学习全文检索");

article.setContent("lucene是搜索引擎开发技术，lucene并不是一个现成的产品,由Apache提供");

//将索引数据转换
Document对象（lucene要求）

Document document =
new Document();

document.add(new
Field("id", article.getId() +
"", Store.YES,

Field.Index.NOT_ANALYZED));//对于id通常不分词

document.add(new
Field("title", article.getTitle(), Store.YES,

Field.Index.ANALYZED_NO_NORMS));

document.add(new
Field("content", article.getContent(), Store.YES,

Field.Index.ANALYZED));

//建立索引库

//索引目录位置

Directory directory = FSDirectory.open(new
File("index"));//当前工程index目录

//分词器

Analyzer analyzer =
new StandardAnalyzer(Version.LUCENE_36);

//写入索引

IndexWriterConfig indexWriterConfig =
new IndexWriterConfig(Version.LUCENE_36,
analyzer);

IndexWriter indexWriter =
new IndexWriter(directory, indexWriterConfig);

//将document数据写入索引库

indexWriter.addDocument(document);

indexWriter.close();

}

上面的单元测试的结果

@Test

//查询索引库
,查看norms效果

publicvoid
testQuery()throws Exception {

//建立Query对象
---- 根据标题

String queryStrng =
"检索";

Analyzer analyzer =
new StandardAnalyzer(Version.LUCENE_36);

QueryParser queryParser =
new QueryParser(Version.LUCENE_36,"title",

analyzer);

Query query = queryParser.parse(queryStrng);

//根据Query查找

Directory directory = FSDirectory.open(new
File("index"));

IndexSearcher indexSearcher =
new IndexSearcher(

IndexReader.open(directory));

//执行查询获得满足结果前多少条记录

TopDocs topDocs = indexSearcher.search(query, 100);//查询满足结果前100条数据

System.out.println("满足结果记录条数："
+ topDocs.totalHits);

//获得每个结果

ScoreDoc[] scoreDocs = topDocs.scoreDocs;

for
(int i = 0; i < scoreDocs.length;
i++) {

//打印得分

System.out.println("得分："
+ scoreDocs[i].score);

//获得Document下标

int
docID = scoreDocs[i].doc;

Document document = indexSearcher.doc(docID);

System.out.println("id:"
+ document.get("id"));

System.out.println("title:"
+ document.get("title"));

System.out.println("content:"
+ document.get("content"));

}

indexSearcher.close();

}

上面的运行单元测试之后的结果如下：

@SuppressWarnings("unused")

@Test

//测试路径写法

publicvoid
testDirectory()throwsIOException
{

//磁盘路径

FSDirectory.open(new
File("index"));//当前工程index目录，相对路径

FSDirectory.open(new
File("d:\\index"));//绝对路径

//类路径
WEB-INF/classes

FSDirectory.open(new
File(LuceneTest.class.getResource("/").getFile()));

//内存路径

Directory directory =
new RAMDirectory();

}

}