ASP.NET中使用Lucene.net(一)

最新推荐文章于 2024-09-12 14:03:22 发布

最新推荐文章于 2024-09-12 14:03:22 发布 · 119 阅读

文章标签：

一.摘要

本篇文章作为Lucene.net的开篇文章向您展示在ASP.NET中的基本使用,更深入的话题比如:搜索的关键字高亮显示,索引从数据库中查询的数据,爬虫,索引更新等高级话题将在后续文章中描述.

二.内容

建立一个ASP.NET网站,添加Lucene.net.dll的引用,在Default.aspx页面里添加如下内容:

   1: <%@ Page Language="C#" %>

2:

   3: <%@ Import Namespace="Lucene.Net.Index" %>

   4: <%@ Import Namespace="Lucene.Net.Analysis.Standard" %>

   5: <%@ Import Namespace="Lucene.Net.Documents" %>

   6: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

7:

   8: <script runat="server">

1:

2:

   3:     protected void Page_Load(object sender, EventArgs e)

   4:     {

   5:         //索引位置

   6:         string sIndexLocation = MapPath("~/searchlucene/");

   7:         bool created;

   8:         //检测索引是否存在

   9:         IsIndexExists(out created, sIndexLocation);

10:

  11:     }

  12:     private void IsIndexExists(out bool created, string sIndexPath)

  13:     {

  14:         created = false;

  15:         if (!IndexReader.IndexExists(sIndexPath))

  16:         {

  17:             IndexWriter writer = new IndexWriter(sIndexPath, new StandardAnalyzer(), true);

  18:             created = true;

  19:             writer.Close();

  20:         }

  21:     }

  22:     //创建索引

  23:     protected void btnCreateIndex_Click(object sender, EventArgs e)

  24:     {

  25:         IndexWriter writer = new IndexWriter(MapPath("~/searchlucene/"), new StandardAnalyzer(), false);

26:

  27:         IndexDocument(writer, "中国", "China", "北京");

  28:         IndexDocument(writer, "美国", "USA", "密歇根");

  29:         IndexDocument(writer, "日本", "Jap", "小日本");

  30:         IndexDocument(writer, "中国", "China", "人均");

  31:         IndexDocument(writer, "2010", "情人节", "万维网");

32:

  33:         writer.Optimize();

  34:         writer.Close();

35:

  36:     }

  37:     //添加文件到索引

  38:     private void IndexDocument(IndexWriter writer, string sHeader, string sType, string sContent)

  39:     {

  40:         Document doc = new Document();

41:

  42:         doc.Add(new Field("header", sHeader, Field.Store.YES, Field.Index.TOKENIZED));

  43:         doc.Add(new Field("type", sType, Field.Store.YES, Field.Index.UN_TOKENIZED));

  44:         doc.Add(new Field("content", sContent, Field.Store.YES, Field.Index.TOKENIZED));

45:

  46:         writer.AddDocument(doc);

47:

  48:     }

  49:     //搜索

  50:     protected void btnSearch_Click(object sender, EventArgs e)

  51:     {

  52:         ListBox1.Items.Clear();

53:

  54:         var searcher = new Lucene.Net.Search.IndexSearcher(MapPath("~/searchlucene/"));

  55:         var oParser = new Lucene.Net.QueryParsers.QueryParser("content", new StandardAnalyzer());

  56:         string sHeader = " OR (header:" + TextBox1.Text + ")";

  57:         string sSearchQuery = "(" + TextBox1.Text + sHeader + ")";

58:

  59:         //解析搜索关键字

  60:         var oHitColl = searcher.Search(oParser.Parse(sSearchQuery));

  61:         for (int i = 0; i < oHitColl.Length(); i++)

  62:         {

  63:             Document oDoc = oHitColl.Doc(i);

  64:             ListBox1.Items.Add(new ListItem(oDoc.Get("header") + oDoc.Get("type") + oDoc.Get("content")));

  65:         }

66:

  67:         searcher.Close();

  68:     }

script>

9:

  10: <html xmlns="http://www.w3.org/1999/xhtml">

  11: <head id="Head1" runat="server">

  12:     <title>Lucene例子title>

  13: head>

  14: <body>

  15:     <form id="form1" runat="server">

  16:     <div>

  17:     div>

  18:     1-

  19:     <asp:Button ID="btnCreateIndex" runat="server" OnClick="btnCreateIndex_Click" Text="index create" />

  20:     <br />

  21:     <br />

  22:     2- <asp:TextBox ID="TextBox1" runat="server">asp:TextBox>

  23:     <asp:Button ID="btnSearch" runat="server" onclick="btnSearch_Click" Text="Search" />

  24:     <p>

  25:         p>

  26:     <p>

  27:         p>

  28:     <asp:ListBox ID="ListBox1" runat="server" Height="322px" Width="712px">asp:ListBox>

  29:     form>

  30: body>

  31: html>

在文本框中输入关键字比如:中国.将列出包含中国关键字的条目

三.源码

由于优快云上传的源码要经过审核,所以我稍后会以评论的形式提供完整版源码地址,谢谢您的访问!