Lucene3.6.2包介绍,第一个Lucene案例介绍,查看索引信息的工具lukeall介绍,Luke查看的索引库内容,索引查找过程
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2.Lucene3.6.2包介绍,第一个Lucene案例介绍,查看索引信息的工具lukeall介绍,Luke查看的索引库内容,索引查找过程
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<span class="link_postdate">2014-12-07 23:39</span>
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1 Lucen目录介绍
2 lucene-core-3.6.2.jar是lucene开发核心jar包
contrib 目录存放,包含一些扩展jar包
3 案例
建立第一个Lucene项目:lucene3_day1
(1)需要先将数据转换成为Document对象,每一个数据信息转换成为Field(String name, String value, Field.Store store, Field.Indexindex)
(2)指定索引库位置Directorydirectory = FSDirectory.open(new File("index"));// 当前Index目录
(3)分词器Analyzeranalyzer = new StandardAnalyzer(Version.LUCENE_36);
(4)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); //关闭索引 indexWriter.close(); |
案例编写:
案例目录: |
Article.java |
package cn.toto.lucene.quickstart;
public class Article { private int id; private String title; private String content; /** * @return the id */ public int getId() { return id; } /** * @param id the id to set */ public void setId(int id) { this.id = id; } /** * @return the title */ public String getTitle() { return title; } /** * @param title the title to set */ public void setTitle(String title) { this.title = title; } /** * @return the content */ public String getContent() { return content; } /** * @param content the content to set */ public void setContent(String content) { this.content = content; } } |
package cn.toto.lucene.quickstart;
import java.io.File;
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.Index; import org.apache.lucene.document.Field.Store; import org.apache.lucene.index.IndexWriter; import org.apache.lucene.index.IndexWriterConfig; import org.apache.lucene.store.Directory; import org.apache.lucene.store.FSDirectory; import org.apache.lucene.util.Version; import org.junit.Test;
/** * @brief LuceneTest.java 测试Lucene的案例 * @attention * @author toto-pc * @date 2014-12-7 * @note begin modify by 涂作权 2014/12/07 null */ public class LuceneTest { @Test public void buildIndex() throws Exception { Article article = new Article(); article.setId(100); article.setTitle("Lucene快速入门"); article.setContent("Lucene是提供了一个简单却强大的应用程式接口," + "能够做全文检索索引和搜寻,在Java开发环境里Lucene是" + "一个成熟的免费的开放源代码工具。");
// 将索引数据转换成为Document对象(Lucene要求) Document document = new Document(); document.add(new Field("id", // 字段 article.getId() + "", Store.YES, // 是否建立索引 Index.ANALYZED // 表示使用分词索引 )); document.add(new Field("title", article.getTitle(), Store.YES,Index.ANALYZED)); document.add(new Field("content", article.getContent(), Store.YES, Index.ANALYZED));
// 建立索引库 // 索引目录位置 Directory directory = FSDirectory.open(new File("index"));// 当前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); // 关闭索引 indexWriter.close(); } } |
运行单元测试后的结果: 运行后index目录下的结果: |
4 可以通过luke工具查看索引库中内容(它是一个jar包)
下载网址:http://code.google.com/p/luke/
打开方式:
如果用这种方式打不可以,可以用命令的方式打开文件,进入这个目录,选中Shift+鼠标右键—>此处打开命令窗口—>输入命令:java -jar lukeall-3.5.0.jar
工具的截图如下:
点击OK后的结果:
通过overview可以查看到索引信息,通过Document可以查看文档对象信息
5 查找
和上面的并集的query代码如下: |
@Test public void searchIndex() throws Exception { //建立Query对象--根据标题 String queryString = "Lucene"; //第一个参数,版本号 //第二个参数,字段 //第三个参数,分词器 Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_36); QueryParser queryParser = new QueryParser(Version.LUCENE_36,"title",analyzer); Query query = queryParser.parse(queryString);
//根据Query查找 // 索引目录位置 Directory directory = FSDirectory.open(new File("index")); IndexSearcher indexSearcher = new IndexSearcher(IndexReader.open(directory)); //查询满足结果的前100条数据 TopDocs topDocs = indexSearcher.search(query, 100); System.out.println("满足结果记录条数:" + topDocs.totalHits);
//获取结果 ScoreDoc[] scoreDocs = topDocs.scoreDocs; for (int i = 0; i < scoreDocs.length; i++) { //先获得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(); } |
运行结果: |
-
Luke查看的索引库内容:
索引库中信息,包括两大部分:
A 索引词条信息
B 文档对象信息
-
每个Field中都存在一个Store和一个Index
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索引内容和Document内容有什么关系
查找时,通过索引内容 查找 文档对象信息
-
索引的查找过程
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