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下面是MyRssSearch类的源码，该类主要实现使用Lucene中Searcher及QueryParser实现从索引库中搜索关键词。
package com.easyjf.lucene;
import java.util.List;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.queryParser.MultiFieldQueryParser;
import org.apache.lucene.queryParser.QueryParser;
import org.apache.lucene.search.Hits;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.Searcher;
import com.easyjf.search.MyRssUtil;
import com.easyjf.search.SearchContent;
import com.easyjf.web.tools.IPageList;
import com.easyjf.web.tools.PageList;
public class MyRssSearch {
private String indexDir;
IndexReader ir;
Searcher search;
public IPageList search(String key,int pageSize,int currentPage)
{
IPageList pList=new PageList(new HitsQuery(doSearch(key)));
pList.doList(pageSize,currentPage,"","",null);
if(pList!=null)
{
List list=pList.getResult();
if(list!=null){
for(int i=0;i {
list.set(i,lucene2searchObj((Document)list.get(i),key));
}
}
}
try{
if(search!=null)search.close();
if(ir!=null)ir.close();
}
catch(Exception e)
{
e.printStackTrace();
}
return pList;
}
private SearchContent lucene2searchObj(Document doc,String key)
{
SearchContent searchObj=new SearchContent();
String title=doc.getField("title").stringValue();
searchObj.setTitle(title.replaceAll(key,"" key ""));
searchObj.setTvalue(doc.getField("cid").stringValue());
searchObj.setUrl(doc.getField("url").stringValue());
searchObj.setSource(doc.getField("source").stringValue());
searchObj.setLastUpdated(doc.getField("inputTime").stringValue());
searchObj.setIntro(MyRssUtil.content2intro(doc.getField("content").stringValue(),key));
return searchObj;
}
public Hits doSearch(String key)
{
Hits hits=null;
try{
ir=IndexReader.open(indexDir);
search=new IndexSearcher(ir);
String fields[]={"title","content"};
QueryParser parser=new MultiFieldQueryParser(fields,new StandardAnalyzer());
Query query=parser.parse(key);
hits=search.search(query);
}
catch(Exception e)
{
e.printStackTrace();
}
//System.out.println("搜索结果:" hits.length());
return hits;
}
public String getIndexDir() {
return indexDir;
}
public void setIndexDir(String indexDir) {
this.indexDir = indexDir;
}
}
在上面的代码中，search方法返回一个封装了分页查询结果的IPageList，IPageList是EasyJWeb Tools业务引擎中的分页引擎，对于IPageList的使用，请看本人写的这篇文章《EasyJWeb Tools中业务引擎分页的设计实现》：
我们针对Lucene的的查询结果Hits结构，写了一个查询器HitsQuery。代码如下所示：
package com.easyjf.lucene;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import org.apache.lucene.search.Hits;
import com.easyjf.web.tools.IQuery;
public class HitsQuery implements IQuery {
private int begin=0;
private int max=0;
private Hits hits;
public HitsQuery()
{
}
public HitsQuery(Hits hits)
{
if(hits!=null)
{
this.hits=hits;
this.max=hits.length();
}
}
public int getRows(String arg0) {
// TODO Auto-generated method stub
return (hits==null?0:hits.length());
}
public List getResult(String arg0) {
// TODO Auto-generated method stub
List list=new ArrayList();
for(int i=begin;i<(begin max)&&(i {
try{
list.add(hits.doc(i));
}
catch(Exception e)
{
e.printStackTrace();
}
}
return list;
}
public void setFirstResult(int begin) {
// TODO Auto-generated method stub
this.begin=begin;
}
public void setMaxResults(int max) {
// TODO Auto-generated method stub
this.max=max;
}
public void setParaValues(Collection arg0) {
// TODO Auto-generated method stub
}
public List getResult(String condition, int begin, int max) {
// TODO Auto-generated method stub
if((begin>=0)&&(begin if(!(max>hits.length()))this.max=max;
return getResult(condition);
}
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