sulin LuceneNet 搜索二

1.添加引用dll

using Lucene.Net.Search;
using Lucene.Net.Analysis.PanGu;
using PanGu;
using PanGu.HighLight;
using Lucene.Net.Documents;
using Lucene.Net.Store;
using Lucene.Net.Index;
using Lucene.Net.QueryParsers;

2.查询代码

 /// <summary>
        /// 从索引搜索结果
        /// </summary>
        private void SearchIndex()
        {
            Dictionary<string, string> dic = new Dictionary<string, string>();
            BooleanQuery bQuery = new BooleanQuery();
            CachingWrapperFilter filter = null;
            TermQuery query2 = null;
            string title = string.Empty;
            string content = string.Empty;
            if ((Request["title"] != null && Request["title"].ToString() != "") || !string.IsNullOrEmpty(txtTitle))
            {
                string searchkey = Request["title"]==null?"":Request["title"].ToString();
                if(!string.IsNullOrEmpty(txtTitle)){
                    searchkey=txtTitle;
                }
                foreach (string word in GetKeyWordsSplitBySpace(searchkey))
                {
                    query2 = new TermQuery(new Term("Title", word));
                    bQuery.Add(query2, BooleanClause.Occur.SHOULD);//这里设置 条件为Or关系
                    query2 = new TermQuery(new Term("SimpleDesc", word));
                    bQuery.Add(query2, BooleanClause.Occur.SHOULD);//这里设置 条件为Or关系
                    query2 = new TermQuery(new Term("Tags", word));
                    bQuery.Add(query2, BooleanClause.Occur.SHOULD);//这里设置 条件为Or关系
                    //query2 = new TermQuery(new Term("ContextDesc", word));
                    //bQuery.Add(query2, BooleanClause.Occur.SHOULD);//这里设置 条件为Or关系
                }
                dic.Add("Title", searchkey);
                dic.Add("SimpleDesc", searchkey);
                txtTitle = searchkey;
               
                if(this.hfradchecked.Value!="全部"){
                    //TermQuery query1 = new TermQuery(new Term("Types", this.hfradchecked.Value));
                    txttype = this.hfradchecked.Value;
                    query2 = new TermQuery(new Term("Types", this.hfradchecked.Value.ToString()));
                    QueryWrapperFilter oldFilter = new QueryWrapperFilter(query2);
                    filter = new CachingWrapperFilter(oldFilter);
                   
                }
                if (bQuery != null && bQuery.GetClauses().Length > 0)
                {
                    GetSearchResult(bQuery, dic, filter);
                }
            }
           
           
        }
        /// <summary>
        /// 获取
        /// </summary>
        /// <param name="bQuery"></param>
        private void GetSearchResult(BooleanQuery bQuery, Dictionary<string, string> dicKeywords, CachingWrapperFilter filter)
        {
            try
            {
                //IndexSearcher search = new IndexSearcher(IndexDic, true);
                FSDirectory directory = FSDirectory.Open(new DirectoryInfo(IndexDic), new NoLockFactory());
                IndexReader reader = IndexReader.Open(directory, true);
                //IndexSearcher是进行搜索的类
                IndexSearcher search = new IndexSearcher(reader);
                Stopwatch stopwatch = Stopwatch.StartNew();
                //SortField构造函数第三个字段true为降序,false为升序
                Sort sort = new Sort(new SortField("UploadTime", SortField.DOC, true));
                TopDocs docs = search.Search(bQuery, filter, PageSize * PageIndex, sort);
                stopwatch.Stop();
                if (docs != null && docs.totalHits > 0)
                {
                    lSearchTime = stopwatch.ElapsedMilliseconds;
                    txtPageFoot = GetPageFoot(PageIndex, PageSize, docs.totalHits, "sabrosus");
                    for (int i = 0; i < docs.totalHits; i++)
                    {
                        if (i >= (PageIndex - 1) * PageSize && i < PageIndex * PageSize)
                        {
                            Document doc = search.Doc(docs.scoreDocs[i].doc);
                            ResourcesModel model = new ResourcesModel()
                            {
                                ID = doc.Get("ID").ToString(),
                                Title = doc.Get("Title").ToString(),
                                Tags = doc.Get("Tags").ToString(),
                                CreaetBy = doc.Get("CreaetBy").ToString(),
                                UploadTime = doc.Get("UploadTime").ToString(),
                                Types = doc.Get("Types").ToString(),
                                SimpleDesc = doc.Get("SimpleDesc").ToString(),
                                ContextDesc = doc.Get("ContextDesc").ToString()
                            };
                            list.Add(SetHighlighter(dicKeywords, model));
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                LogHelper.SaveLogError("",ex.ToString());
                
            }
           
        }

        /// <summary>
        /// 处理关键字为索引格式
        /// </summary>
        /// <param name="keywords"></param>
        /// <returns></returns>
        private string[] GetKeyWordsSplitBySpace(string keywords)
        {
            PanGuTokenizer ktTokenizer = new PanGuTokenizer();
            StringBuilder result = new StringBuilder();
            List<string> listarry = new List<string>();
            ICollection<WordInfo> words = ktTokenizer.SegmentToWordInfos(keywords);

            foreach (WordInfo word in words)
            {
                if (word == null)
                {
                    continue;
                }
                listarry.Add(word.Word);
            }
            return listarry.ToArray(); 
        }

        /// <summary>
        /// 设置关键字高亮
        /// </summary>
        /// <param name="dicKeywords">关键字列表</param>
        /// <param name="model">返回的数据模型</param>
        /// <returns></returns>
        private ResourcesModel SetHighlighter(Dictionary<string, string> dicKeywords, ResourcesModel model)
        {
            SimpleHTMLFormatter simpleHTMLFormatter = new PanGu.HighLight.SimpleHTMLFormatter("<font color="red">", "</font>");
            Highlighter highlighter = new PanGu.HighLight.Highlighter(simpleHTMLFormatter, new Segment());
            highlighter.FragmentSize = 50;
            string strTitle = string.Empty;
            string strContent = string.Empty;
            string Title = model.Title;
            string SimpleDesc = model.SimpleDesc;
            dicKeywords.TryGetValue("Title", out strTitle);
            dicKeywords.TryGetValue("SimpleDesc", out strContent);
            
            if (!string.IsNullOrEmpty(strTitle))
            {
                model.Title = highlighter.GetBestFragment(strTitle, model.Title);
                if (model.Title == "" || model.Title==null)
                {
                    model.Title = Title;
                }
            }
          
            if (!string.IsNullOrEmpty(strContent))
            {
                model.SimpleDesc = highlighter.GetBestFragment(strContent, model.SimpleDesc);
                if (model.SimpleDesc == "" || model.SimpleDesc == null)
                {
                    model.SimpleDesc = SimpleDesc;
                }
                model.SimpleDesc = GetContextSubstring(model.SimpleDesc, 200);
            }
            return model;
        }