luncene

import java.util.ArrayList;

import java.util.List;

import org.apache.lucene.analysis.Analyzer;

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

import org.apache.lucene.index.IndexWriter;

import org.apache.lucene.index.Term;

import org.apache.lucene.index.IndexWriter.MaxFieldLength;

import org.apache.lucene.queryParser.MultiFieldQueryParser;

import org.apache.lucene.queryParser.QueryParser;

import org.apache.lucene.search.IndexSearcher;

import org.apache.lucene.search.Query;

import org.apache.lucene.search.TopDocs;

import cn.itcast.cc.lucene.helloword.Article;

import cn.itcast.cc.lucene.helloword.utils.ArticleDocUtils;

publicclass IndexDao {

// 索引目录

private String indexPath &＃61; "./index";

// 分词器

private Analyzer analyzer &＃61; new StandardAnalyzer();

/**

*保存记录

*

*&＃64;paramart

*/

publicvoid save(Article art) {

// lucene的写出索引类

IndexWriter indexWriter &＃61; null;

try {

indexWriter &＃61; new IndexWriter(this.indexPath, this.analyzer,

MaxFieldLength.LIMITED);

// 添加到索引库

indexWriter.addDocument(ArticleDocUtils.Article2Doc(art));

} catch (Exception e) {

e.printStackTrace();

}

// 释放indexWriter

if (indexWriter !&＃61; null) {

try {

// 使用后一定要关闭

indexWriter.close();

} catch (Exception e) {

e.printStackTrace();

}

}

}

/**

*更新记录

*

*&＃64;paramart

*/

publicvoid update(Article art) {

IndexWriter indexWriter &＃61; null;

try {

indexWriter &＃61; new IndexWriter(this.indexPath, this.analyzer,

MaxFieldLength.LIMITED);

Term term &＃61; new Term("id", art.getId() &＃43; "");

// 更新

indexWriter.updateDocument(term, ArticleDocUtils.Article2Doc(art));

} catch (Exception e) {

e.printStackTrace();

}

// 释放indexWriter

if (indexWriter !&＃61; null) {

try {

indexWriter.close();

} catch (Exception e) {

e.printStackTrace();

}

}

}

/**

*删除记录

*

*&＃64;paramid

*/

publicvoid delete(int id) {

IndexWriter indexWriter &＃61; null;

try {

indexWriter &＃61; new IndexWriter(this.indexPath, this.analyzer,

MaxFieldLength.LIMITED);

Term term &＃61; new Term("id", id &＃43; "");

// 删除

indexWriter.deleteDocuments(term);

} catch (Exception e1) {

e1.printStackTrace();

}

// 释放indexWriter

if (indexWriter !&＃61; null) {

try {

indexWriter.close();

} catch (Exception e) {

e.printStackTrace();

}

}

}

/**

*查询记录&＃xff08;具有分页功能&＃xff09;

*

*&＃64;paramqueryString

*&＃64;paramstartIndex

*&＃64;paramrecordCount

*&＃64;return

*/

public List search(String queryString, int startIndex, int recordCount) {

List result &＃61; new ArrayList();

IndexSearcher indexSearcher &＃61; null;

try {

indexSearcher &＃61; new IndexSearcher(this.indexPath);

String[] fields &＃61; new String[] {"title","content"};

// 分析查询条件

QueryParser queryParser &＃61; new MultiFieldQueryParser(fields,

this.analyzer);

// 生成查询对象

Query query &＃61; queryParser.parse(queryString);

int findTotalRecord &＃61; startIndex &＃43; recordCount;

// 查询

TopDocs topDocs &＃61; indexSearcher.search(query, null, findTotalRecord);

//获取分页数据

int endIndex &＃61; Math.min(startIndex&＃43;recordCount,topDocs.totalHits);

for(int i&＃61;startIndex; i

result.add(indexSearcher.doc(topDocs.scoreDocs[i].doc));

}

} catch (Exception e1) {

e1.printStackTrace();

}

// 释放indexWriter

if (indexSearcher !&＃61; null) {

try {

indexSearcher.close();

} catch (Exception e) {

e.printStackTrace();

}

}

return result;

}

}

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 cn.itcast.cc.lucene.helloword.Article;

publicclass ArticleDocUtils {

publicstatic Document Article2Doc(Article art){

// lucene索引库中的document对象

Document doc &＃61; new Document();

// 添加到document中的都是field对象&＃xff0c;注册其中的key&＃xff0c;检索时会用到。

// Store是否存储&＃xff0c;决定对象是临时性还是持久性的

// Index在库中建立什么样的索引

doc.add(new Field("id", art.getId()&＃43;"", Store.YES, Index.NOT_ANALYZED));

doc.add(new Field("title", art.getTitle(), Store.YES, Index.ANALYZED));

doc.add(new Field("content", art.getContent(), Store.YES, Index.ANALYZED));

return doc;

}

publicstatic Article Doc2Article(Document doc){

Article art &＃61; new Article();

art.setId(Integer.parseInt(doc.getField("id").stringValue()));

art.setTitle(doc.getField("title").stringValue());

art.setContent(doc.getField("content").stringValue());

return art;

}