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应用lucene.net进行搜索测试

 2006-08-28 17:13:49 来源:WEB开发网   
核心提示:经过上篇我们已经对59部小说文本建立了索引,详情可见http://www.cnblogs.com/abob/archive/2006/08/26/487140.html 1: 搜索关键字 using System;using System.Collections.Generic;using System.Text;us

经过上篇我们已经对59部小说文本建立了索引,详情可见http://www.cnblogs.com/abob/archive/2006/08/26/487140.html
 1: 搜索关键字 using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using Lucene.Net.Analysis;
using Lucene.Net.Documents;
using Lucene.Net.Index;
using Lucene.Net.QueryParsers;
using Lucene.Net.Search;
using Lucene.Net.Analysis.Cn;

namespace SearchTest
{
   class SearchTest
   {
     PRivate IndexSearcher searcher = null;
     private Analyzer analyser = null;

   public SearchTest()
     {
       analyser = new ChineseAnalyzer();
       searcher = new IndexSearcher(IndexReader.Open("c:\\index"));
     }

   public Hits search(String queryString, string field)
     {
       if (searcher != null)
       {
         try
         {
           QueryParser parser = new QueryParser(field,analyser);
           parser.SetOperator(QueryParser.DEFAULT_OPERATOR_AND);
           Query query = parser.Parse(queryString);
           return searcher.Search(query);
         }
         catch { }
       }
       return null;
     }

   static void Main(string[] args)
     {
       SearchTest searcher = new SearchTest();
       DateTime start = DateTime.Now;
       Hits h = searcher.search("中国", "content");
       DateTime end = DateTime.Now;
       long time = end.Ticks - start.Ticks;
       Console.WriteLine("总共耗时:{0}毫秒",Convert.ToString(time));
       Console.WriteLine("总共找到{0}个文件",h.Length());
     }
   }
}

由于搜索是一种注重效率的行为,因此将其构建成一个轻量级的对象能节省不少内存和时间上的开销.在上面的代码中,内置了一个IndexSearcher对象,并调用其search方法来检索.
在代码最后的main函数中,输入了关键字"中国",搜索的结果是

 总共耗时:1406250毫秒
总共找到22个文件
请按任意键继续. . .

2:下面为了性能上的提高,我们来用多线程进行搜索
using System;
using System.Collections.Generic;
using System.Text;
using Lucene.Net.Analysis.Cn;
using Lucene.Net.Index;
using Lucene.Net.QueryParsers;
using Lucene.Net.Search;
using System.Threading;


namespace MuiltiSearch
{
   class MultiSearch
   {

   static void Main(string[] args)
     {
       for (int i = 0; i < 50; i++)
       {
         SearchThread s = new SearchThread();
         Thread thread=new Thread(s.run);
         thread.Start();
       }
     }

   }

  public  class SearchThread
  {
     public void run()
     {
       Thread.Sleep(10);
       IndexSearcher searcher = new IndexSearcher(IndexReader.Open("c:\\index"));
       QueryParser parser = new QueryParser("content", new ChineseAnalyzer());
       parser.SetOperator(QueryParser.DEFAULT_OPERATOR_AND);
       Query query = parser.Parse("中国");
       DateTime start = DateTime.Now;

     Hits h = searcher.Search(query);

     DateTime end = DateTime.Now;
       long time = start.Ticks - end.Ticks;

     Console.WriteLine("用时{0}毫秒", time);
     }
   }
}

http://www.cnblogs.com/abob/archive/2006/08/27/487558.html

Tags:应用 lucene net

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