lucene操作

package com.java.lucene;

import java.io.StringReader;
import java.nio.file.Paths;
import java.util.Date;
import java.util.LinkedList;
import java.util.List;

import org.apache.commons.lang.StringEscapeUtils;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.cn.smart.SmartChineseAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field.Store;
import org.apache.lucene.document.StringField;
import org.apache.lucene.document.TextField;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.index.Term;
import org.apache.lucene.queryparser.classic.QueryParser;
import org.apache.lucene.search.BooleanQuery;
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.search.highlight.Fragmenter;
import org.apache.lucene.search.highlight.Highlighter;
import org.apache.lucene.search.highlight.QueryScorer;
import org.apache.lucene.search.highlight.SimpleHTMLFormatter;
import org.apache.lucene.search.highlight.SimpleSpanFragmenter;
import org.apache.lucene.search.BooleanClause;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;

import com.java.entity.Blog;
import com.java.util.DateUtil;
import com.java.util.StringUtil;

/**
* 博客索引类
* @author Administrator
*
*/
public class BlogIndex {

private Directory dir;

/**
* 获取indexWriter实例
* @return
* @throws Exception
*/
private IndexWriter getWriter()throws Exception{
dir = FSDirectory.open(Paths.get("d://lucene")); //写索引的目录
SmartChineseAnalyzer analyzer = new SmartChineseAnalyzer(); //中文分词器
IndexWriterConfig iwc = new IndexWriterConfig(analyzer); //IndexWriter配置中文分析器
IndexWriter writer = new IndexWriter(dir,iwc);//实例化一个IndexWriter
return writer;
}

/**
* 添加博客索引
* @param blog
* @throws Exception
*/
public void addIndex(Blog blog)throws Exception{
IndexWriter writer = this.getWriter();
Document doc = new Document();
//StringField 不进行分词 TextField 进行分词，Store.Yes表示进行存储
doc.add(new StringField("id",String.valueOf(blog.getId()),Store.YES));
doc.add(new TextField("title", blog.getTitle(), Store.YES));
doc.add(new StringField("releaseDate", DateUtil.formatDate(new Date(), "yyyy-MM-dd"), Store.YES));
doc.add(new TextField("content", blog.getContentNoTag(), Store.YES));
writer.addDocument(doc);
writer.close();
}

/**
* 删除索引
* @throws Exception
*/
public void deleteIndex(String blogId)throws Exception{
IndexWriter writer = this.getWriter();
writer.deleteDocuments(new Term("id",blogId));//id唯一标示，并且生成过索引
writer.forceMergeDeletes();//强制删除索引
writer.commit();
writer.close();
}
public void updateIndex(Blog blog)throws Exception{
IndexWriter writer = this.getWriter();
Document doc = new Document();
doc.add(new StringField("id",String.valueOf(blog.getId()),Store.YES));
doc.add(new TextField("title", blog.getTitle(), Store.YES));
doc.add(new StringField("releaseDate", DateUtil.formatDate(new Date(), "yyyy-MM-dd"), Store.YES));
doc.add(new TextField("content", blog.getContentNoTag(), Store.YES));
writer.updateDocument(new Term("id",String.valueOf(blog.getId())), doc);//id标示，生成过索引
writer.close();
}
/**
* lucene查询博客信息
* @param q
* @return
* @throws Exception
*/
public List searchBlog(String q)throws Exception{
dir=FSDirectory.open(Paths.get("d://lucene"));
IndexReader reader=DirectoryReader.open(dir);//通过dir获得IndexReader
IndexSearcher is=new IndexSearcher(reader);//searcher搜索index
BooleanQuery.Builder booleanQuery=new BooleanQuery.Builder();//多个字段检索，结果与或非
SmartChineseAnalyzer analyzer=new SmartChineseAnalyzer();
QueryParser parser=new QueryParser("title", analyzer);
Query query=parser.parse(q);

QueryParser parser2=new QueryParser("content", analyzer);
Query query2=parser2.parse(q);

booleanQuery.add(query, BooleanClause.Occur.SHOULD);//must与，should或，nust_not非
booleanQuery.add(query2, BooleanClause.Occur.SHOULD);

TopDocs hits=is.search(booleanQuery.build(), 100);//最匹配的前100条

QueryScorer scorer=new QueryScorer(query);
Fragmenter fragmenter=new SimpleSpanFragmenter(scorer); //得分高的片段
SimpleHTMLFormatter simpleHTMLFormatter=new SimpleHTMLFormatter("");//highligther的格式
Highlighter highlighter=new Highlighter(simpleHTMLFormatter, scorer);
highlighter.setTextFragmenter(fragmenter);

List blogList=new LinkedList();
for(ScoreDoc scoreDoc:hits.scoreDocs){ //hits.scoreDocs search存在的有得分的前100 socreDoc
Document doc=is.doc(scoreDoc.doc);//scoreDoc.doc doc的ID is.doc(id)通过id返回 document
Blog blog=new Blog();
blog.setId(Integer.parseInt(doc.get("id")));
blog.setReleaseDateStr(doc.get("releaseDate"));
String title=doc.get("title");
String content=StringEscapeUtils.escapeHtml(doc.get("content"));//由于ueditor存入的content是带html标签对的，所以返回时除去标签对，不然页面foreach时就乱码了
if(title!=null){
TokenStream tokenStream=analyzer.tokenStream("title", new StringReader(title));
String hTitle=highlighter.getBestFragment(tokenStream, title); //取得高分片段到页面进行展示
if(StringUtil.isEmpty(hTitle)){
blog.setTitle(title);
}else{
blog.setTitle(hTitle);
}
}

if(content!=null){
TokenStream tokenStream=analyzer.tokenStream("content", new StringReader(content));
String hContent=highlighter.getBestFragment(tokenStream, content);
if(StringUtil.isEmpty(hContent)){
if(content.length()<=200){
blog.setContent(content);
}else{
blog.setContent(content.substring(0, 200));
}
}else{
blog.setContent(hContent);
}
}
blogList.add(blog);
}
return blogList;
}

}