学步园

首先,在项目中先引用Lucene.Net.Dll

 然后建立一个(创建索引的页面)index.aspx

<div>

 <h3>新建索引</h3>

 <p> 使用该功能会删除原有的索引文件，对所有新闻建立新的索引,随着新闻的越来越多 耗时会越来越多

 </p>

  <p>

  <asp:button id="btnNew" runat="server" text="新建索引" onclick="btnNew_Click">

  </asp:button></p>

  </div>

 

然后,在index.aspx.cs文件中

//创建索引文件,并写入索引数据

 

protected void btnNew_Click(object sender, EventArgs e)
        {
            IList<contentsmodel> contents = Contents.GetContentsByCategory(18);//这里取得表数据的集合
            string indexDir = ConfigurationManager.AppSettings["indexDir"];//这里是在web.config中写上索引存放的路径
            Analyzer analyzer = new StandardAnalyzer(global::Lucene.Net.Util.Version.LUCENE_29);
            IndexWriter writer = new IndexWriter(indexDir, analyzer, true);
try
            {
foreach (var item in contents)
                {
if (IsContentLegal(item))
                    {
                        writer.AddDocument(GetDocument(item));
                    }
                }
                writer.SetMergeFactor(30);
                writer.SetMaxBufferedDocs(30);
                writer.Optimize();
            }
catch
            {
            }
finally
            {
                writer.Close();
            }
        }

//过滤不符合的数据

 

private bool IsContentLegal(ContentsModel contentInfo)
        {
return contentInfo.Title != null &&
                    contentInfo.ContentBody != null;
        }

将索引列写入索引文件中

 private Document GetDocument(ContentsModel contentModel)
        {
            Document doc = new Document();

//存储但不索引  主要用来构建页面
            doc.Add(new Field("cId", contentModel.Id.ToString(), Field.Store.YES, Field.Index.NO));
            doc.Add(new Field("content_thumbnail", contentModel.Thumbnail, Field.Store.YES, Field.Index.NO));
            doc.Add(new Field("issue_datetime", contentModel.Issue.ToString(), Field.Store.YES, Field.Index.NO));
            doc.Add(new Field("category_id", contentModel.CategoryId.ToString(), Field.Store.YES, Field.Index.NO));

//既存储， 又索引
            doc.Add(new Field("content_title", contentModel.Title.ToString(), Field.Store.YES, Field.Index.ANALYZED));
            doc.Add(new Field("content_body", contentModel.ContentBody.ToString(), Field.Store.YES, Field.Index.ANALYZED));
return doc;
        }

 

搜素结果显示Result.aspx页面

  

<div>
<%for (int i = 0; i < hitsOfpage.Count; i++){ %>
<ul>
<li>
<span><%=hitsOfpage[i].Get("content_title")%></span>
</li>
 </ul>
<%} %>
</div>

 

最后,在搜索结果页Result.aspx.cs

//本来有分页的.但我的分页用的pager类.木有用sql存储.所以就不把分页代码贴出来了.

 public partial class Result : System.Web.UI.Page
    {
        const int PAGE_SIZE = 7;
        protected int totalPageCount;
        protected int currentPageIndex;
        protected string searchp;
        protected static List<Document> hitsOfpage = new List<Document>();
        protected void Page_Load(object sender, EventArgs e)
        {
            searchp = Request["q"];
            string pagenum = Request.QueryString["page"];
            if (pagenum == null)
            {
                pagenum = "0";
            }
            int pageIndex = 1;

            int.TryParse(pagenum.Trim(), out pageIndex);

            if (pageIndex < 1)
            {
                pageIndex = 1;
            }

            Hits hits = SearchQuery(searchp);
            currentPageIndex = pageIndex;
            int count = hits.Length();
            //分页
            int pageCount = count / PAGE_SIZE + (count % PAGE_SIZE > 0 ? 1 : 0);
            currentPageIndex = Math.Min(currentPageIndex, pageCount);
            int startPos = Math.Max((currentPageIndex - 1) * PAGE_SIZE, 0);
            int endPos = Math.Min(currentPageIndex * PAGE_SIZE - 1, count - 1);
            hitsOfpage.Clear();
            for (int i = startPos; i <= endPos; i++)
            {
                hitsOfpage.Add(hits.Doc(i));
            }
            if (count % PAGE_SIZE != 0)
            {
                totalPageCount = count / PAGE_SIZE + 1;
            }
            else
            {
                totalPageCount = count / PAGE_SIZE;
            }
        }

 

//根据搜索条件查询索引文件返回hits集合

   private Hits SearchQuery(string word)
        {
string indexDir = ConfigurationManager.AppSettings["indexDir"];//索引文件的位置
            string[] field = new string[] { "content_title", "content_body" };//耦合的字段
            IndexReader reader = IndexReader.Open(indexDir, true);
            IndexSearcher searcher = new IndexSearcher(reader);
            MultiFieldQueryParser queryParser = new MultiFieldQueryParser(Lucene.Net.Util.Version.LUCENE_29, field,new StandardAnalyzer());
            Query query = queryParser.Parse(word);
return searcher.Search(query);
        }

 

2011-11-28补充一个东西.后来发现在搜索的时候如果输入运算符会报异常,发现原因所在改用BooleanQuery 

private Hits SearchQuery(string querystring)
{
string indexDir = ConfigurationManager.AppSettings["indexDir"];
Analyzer analyzer = new StandardAnalyzer();
//构造BooleanQuery
QueryParser parser = new QueryParser("content_title", analyzer);
BooleanQuery bquery = new BooleanQuery();
TokenStream ts = analyzer.TokenStream(null, new StringReader(querystring));
Lucene.Net.Analysis.Token token;
while ((token = ts.Next()) != null)
{
Query query = parser.Parse(token.TermText());
bquery.Add(query, BooleanClause.Occur.MUST);
}
//构造完成
IndexReader reader = IndexReader.Open(Server.MapPath(indexDir), true);
IndexSearcher searcher = new IndexSearcher(reader);

//Query query = parser.Parse(querystring);
//输出我们要查看的表达式
return searcher.Search(bquery);
}