应用lucene.net进行搜索测试

王朝c#·作者佚名  2008-05-30
窄屏简体版  字體: |||超大  

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

 
 
 
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