使用Lucene.net来进行索引和检索

1.去 http://lucenenet.apache.org/  下载lunece.net  文件

2.在项目添加引用Lucene.Net.dll 

class Program
    {
        static void Main(string[] args)
        {

            //索引

            Directory direcotry = FSDirectory.GetDirectory("LuceneIndex");
            Analyzer analyzer = new StandardAnalyzer();
            IndexWriter writer = new IndexWriter(direcotry,analyzer);


            IndexReader red = IndexReader.Open(direcotry);
            int totDocs = red.MaxDoc();
            red.Close();

            //添加文档到索引

            string text = string.Empty;
            Console.WriteLine("输入文本你想要添加到索引:");
            Console.Write(">");

            int txts = totDocs;
            int j = 0;
            while((text=Console.ReadLine())!=string.Empty)
            {
                AddTextToIndex(txts++,text,writer);
                j++;
                Console.Write(">");

            }

            writer.Optimize();
         
            writer.Flush();
            writer.Close();

            Console.WriteLine(j + " lines added, " + txts + " documents total");

            //搜索
            IndexSearcher searcher = new IndexSearcher(direcotry);
            QueryParser parser = new QueryParser("postBody", analyzer);

            Console.WriteLine("输入搜索的文本:");
            Console.Write(">");

            while ((text = Console.ReadLine()) != String.Empty)
            {
                Search(text, searcher, parser);
                Console.Write(">");
            }

            //关闭资源
            searcher.Close();
            direcotry.Close();
        }

        //搜索
        private static void Search(string text,IndexSearcher searcher,QueryParser parser)
        {   //条件
            Query query = parser.Parse(text);
 
            //搜索
            Hits hits = searcher.Search(query);

            //显示结果
            Console.WriteLine("搜索 '" + text + "'");
            int results = hits.Length();
            Console.WriteLine("发现 {0} 结果", results);

            for (int i = 0; i < results; i++)
            {
                Document doc = hits.Doc(i);
                float score = hits.Score(i);
                Console.WriteLine("--结果 num {0}, 耗时 {1}", i + 1, score);
                Console.WriteLine("--ID: {0}", doc.Get("id"));
                Console.WriteLine("--Text found: {0}" + Environment.NewLine, doc.Get("postBody"));
            }
        }


        //添加文档到索引中
        private static void AddTextToIndex(int txts,string text,IndexWriter writer)
        {
            Document doc = new Document();
            doc.Add(new Field("id",text.ToString(),Field.Store.YES,Field.Index.UN_TOKENIZED));
            doc.Add(new Field("postBody",text,Field.Store.YES,Field.Index.TOKENIZED));
            writer.AddDocument(doc);

        }
    }