Lucene.net应用

  /// <summary>
       /// 对输入的搜索的条件进行分词
       /// </summary>
       /// <param name="str"></param>
       /// <returns></returns>
       public static List<string> GetPanGuWord(string str)
       {
           Analyzer analyzer = new PanGuAnalyzer();
           TokenStream tokenStream = analyzer.TokenStream("", new StringReader(str));
           Lucene.Net.Analysis.Token token = null;
           List<string> list = new List<string>();
           while ((token = tokenStream.Next()) != null)
           {
              list.Add(token.TermText());
           }
           return list;
       }

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace CZBK.ItcastOA.WebApp.Models
{
    public class ViewSarchContentModel
    {
        public string Id { get; set; }
        public string Title { get; set; }
        public string Content { get; set; }
    }
}

       /// <summary>
        /// 负责向写数据
        /// </summary>
        private void CreateSearchIndex()
        {
            string indexPath = @"C:\lucenedir";//注意和磁盘上文件夹的大小写一致，否则会报错。将创建的分词内容放在该目录下。
            FSDirectory directory = FSDirectory.Open(new DirectoryInfo(indexPath), new NativeFSLockFactory());//指定索引文件(打开索引目录) FS指的是就是FileSystem
            bool isUpdate = IndexReader.IndexExists(directory);//IndexReader:对索引进行读取的类。该语句的作用：判断索引库文件夹是否存在以及索引特征文件是否存在。
            if (isUpdate)
            {
                //同时只能有一段代码对索引库进行写操作。当使用IndexWriter打开directory时会自动对索引库文件上锁。
                //如果索引目录被锁定（比如索引过程中程序异常退出），则首先解锁（提示一下：如果我现在正在写着已经加锁了，但是还没有写完，这时候又来一个请求，那么不就解锁了吗？这个问题后面会解决）
                if (IndexWriter.IsLocked(directory))
                {
                    IndexWriter.Unlock(directory);
                }
            }
            IndexWriter writer = new IndexWriter(directory, new PanGuAnalyzer(), !isUpdate, Lucene.Net.Index.IndexWriter.MaxFieldLength.UNLIMITED);//向索引库中写索引。这时在这里加锁。
           List<Books>list= BookService.LoadEntities(c=>true).ToList();

           foreach (Books bookModel in list)
           {
               writer.DeleteDocuments(new Term("Id",bookModel.Id.ToString()));
               Document document = new Document();//表示一篇文档。
               //Field.Store.YES:表示是否存储原值。只有当Field.Store.YES在后面才能用doc.Get("number")取出值来.Field.Index. NOT_ANALYZED:不进行分词保存
               document.Add(new Field("Id",bookModel.Id.ToString(), Field.Store.YES, Field.Index.NOT_ANALYZED));

               //Field.Index. ANALYZED:进行分词保存:也就是要进行全文的字段要设置分词 保存（因为要进行模糊查询）

               //Lucene.Net.Documents.Field.TermVector.WITH_POSITIONS_OFFSETS:不仅保存分词还保存分词的距离。
               document.Add(new Field("Title", bookModel.Title, Field.Store.YES, Field.Index.ANALYZED, Lucene.Net.Documents.Field.TermVector.WITH_POSITIONS_OFFSETS));

               document.Add(new Field("Content", bookModel.ContentDescription, Field.Store.YES, Field.Index.ANALYZED, Lucene.Net.Documents.Field.TermVector.WITH_POSITIONS_OFFSETS));

               writer.AddDocument(document);
           }
            
            writer.Close();//会自动解锁。
            directory.Close();//不要忘了Close，否则索引结果搜不到

        }

       private List<ViewSarchContentModel> SearchBookContent()
        {
            string indexPath = @"C:\lucenedir";
            List<string> kw =Common.WebCommon.GetPanGuWord(Request["txtContent"]);

            FSDirectory directory = FSDirectory.Open(new DirectoryInfo(indexPath), new NoLockFactory());
            IndexReader reader = IndexReader.Open(directory, true);
            IndexSearcher searcher = new IndexSearcher(reader);
            //搜索条件
            PhraseQuery query = new PhraseQuery();
            foreach (string word in kw)//先用空格，让用户去分词，空格分隔的就是词“计算机   专业”
            {
                query.Add(new Term("Content", word));
            }
            //query.Add(new Term("body","语言"));--可以添加查询条件，两者是add关系.顺序没有关系.
            //query.Add(new Term("body", "大学生"));
            //query.Add(new Term("body", kw));//body中含有kw的文章
            query.SetSlop(100);//多个查询条件的词之间的最大距离.在文章中相隔太远 也就无意义.（例如 “大学生”这个查询条件和"简历"这个查询条件之间如果间隔的词太多也就没有意义了。）
            //TopScoreDocCollector是盛放查询结果的容器
            TopScoreDocCollector collector = TopScoreDocCollector.create(1000, true);
            searcher.Search(query, null, collector);//根据query查询条件进行查询，查询结果放入collector容器
            ScoreDoc[] docs = collector.TopDocs(0, collector.GetTotalHits()).scoreDocs;//得到所有查询结果中的文档,GetTotalHits():表示总条数   TopDocs(300, 20);//表示得到300（从300开始），到320（结束）的文档内容.
            //可以用来实现分页功能

            List<ViewSarchContentModel> list = new List<ViewSarchContentModel>();
            for (int i = 0; i < docs.Length; i++)
            {
                ViewSarchContentModel viewModel = new ViewSarchContentModel();
                //
                //搜索ScoreDoc[]只能获得文档的id,这样不会把查询结果的Document一次性加载到内存中。降低了内存压力，需要获得文档的详细内容的时候通过searcher.Doc来根据文档id来获得文档的详细内容对象Document.
                
                
                int docId = docs[i].doc;//得到查询结果文档的id（Lucene内部分配的id）
                Document doc = searcher.Doc(docId);//找到文档id对应的文档详细信息
                viewModel.Id = doc.Get("Id");
                viewModel.Title = doc.Get("Title");
                viewModel.Content =Common.WebCommon.CreateHightLight(Request["txtContent"], doc.Get("Content"));//搜索内容关键字高亮显示
                list.Add(viewModel);
                
            }
            return list;
        }

 public ActionResult SearchContent()
        {
            if (!string.IsNullOrEmpty(Request["btnSearch"]))
            {
               List<ViewSarchContentModel>list= SearchBookContent();
               ViewData["searchList"] = list;
               ViewData["searchWhere"] = Request["txtContent"];
               return View("Index");
            }
            else
            {
                CreateSearchIndex();
            }
            return Content("ok");
        }

@{
    Layout = null;
}
@using CZBK.ItcastOA.WebApp.Models
<!DOCTYPE html>
<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>文档搜索</title>
    <script src="~/Scripts/jquery-1.7.1.min.js"></script>
    <style type="text/css">
      .search-text2{ display:block; width:528px; height:26px; line-height:26px; float:left; margin:3px 5px; border:1px solid; font-family:‘Microsoft Yahei‘; font-size:14px;}
      .search-btn2{width:102px; height:32px; line-height:32px; cursor:pointer; border:0px; background-color:#d6000f;font-family:‘Microsoft Yahei‘; font-size:16px;color:#f3f3f3;}
      .search-list{width:600px; overflow:hidden; margin:10px 20px 0px 20px;}
       .search-list dt{font-family:‘Microsoft Yahei‘; font-size:16px; line-height:20px; margin-bottom:7px; font-weight:normal;}
       .search-list .search-detail{font-size:12px; color:#666666;margin-bottom:5px; font-family:Arial;line-height:16px;}
       .search-list dt a{color:#2981a9;}
    </style>
 
</head>
<body>

      <!-- JiaThis Button BEGIN -->
<script type="text/javascript" >
    var jiathis_config = {
        data_track_clickback: true,
        showClose: true,
        hideMore: false
    }
</script>
<script type="text/javascript" src="http://v3.jiathis.com/code/jiathis_r.js?uid=1986459&type=left&btn=l.gif&move=0" charset="utf-8"></script>
<!-- JiaThis Button END -->
    <div>
        <form method="get" action="/Search/SearchContent">
            <input type="text" value="@ViewData["searchWhere"]" name="txtContent" autocomplete="off" class="search-text2"/>
            <input type="submit" value="搜一搜" name="btnSearch" class="search-btn2" />
            <input type="submit" value="创建索引库" name="btnCreate" />
        </form>

        <dl class="search-list">
        @if (ViewData["searchList"] != null)
        {
            foreach (ViewSarchContentModel viewModel in (List<ViewSarchContentModel>)ViewData["searchList"])
            {
                <dt><a href="/Book/ShowDetail/?id=@viewModel.Id"> @viewModel.Title</a></dt>
             <dd class="search-detail">@MvcHtmlString.Create(viewModel.Content)</dd>
            }
        }
            </dl>

    </div>
</body>
</html>