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);
}
}
}