searchaction.java

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package luceneAction;

import java.io.*;
import javax.servlet.http.*;
import javax.servlet.ServletContext;
import org.apache.lucene.analysis.*;
import org.apache.lucene.analysis.standard.*;
import org.apache.lucene.index.*;
import org.apache.lucene.queryParser.*;
import org.apache.lucene.search.*;
import org.apache.struts.action.*;
import org.bit.demo.*;
import luceneActionForm.*;

public class searchAction extends Action 
{
	
	public ActionForward execute(ActionMapping actionMapping, ActionForm actionForm, HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) 
	{
		searchActionForm sForm = (searchActionForm) actionForm;
		String queryString = null;
		try 
		{
			queryString = new String(sForm.getQuery().getBytes("ISO8859_1"), "GB2312");
		} 
		catch(UnsupportedEncodingException ex) 
		{
			ex.printStackTrace();
		}
		String max = sForm.getMaxresults();
		int maxresults = Integer.parseInt(max);
		int startindex = 0;
		int thispage = maxresults;
		IndexSearcher searcher = null;
		Query query = null;
		Hits hits = null;
		try 
		{
			searcher = new IndexSearcher(IndexReader.open(Configuration.INDEX_STORE_PATH));
		} 
		catch(Exception e) 
		{
			e.printStackTrace();
		}
		Analyzer analyzer = new StandardAnalyzer();
		try 
		{
			query = QueryParser.parse(queryString, "contents", analyzer);
		} 
		catch(Exception e) 
		{
			System.out.println(e.getMessage());
		}
		try 
		{
			hits = searcher.search(query);
		} 
		catch(Exception e) 
		{
			e.printStackTrace();
		}
		ServletContext application = httpServletRequest.getSession().getServletContext();
		application.setAttribute("hits", hits);
		int length = hits.length();
		int page = 0;
		if(length != 0)
		{			
			if(length / maxresults != 0 && length % maxresults != 0)
			{				
				page = length / maxresults + 1;
			}
			else if(length / maxresults == 0 && length % maxresults != 0)
			{				
				page = 1;
			}
			else if(length / maxresults != 0 && length % maxresults == 0)
			{				
				page = length / maxresults;
			}
		}
		if(startindex + maxresults >= length)
		{			
			thispage = thispage - (1 + maxresults + startindex - length);
		}
		SearchPara searchpara = new SearchPara(startindex, maxresults, thispage, page);
		application.setAttribute("searchpara", searchpara);
		return actionMapping.findForward("showresults");
	}
}