Lucenet.Net学习笔记

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using Lucene.Net.Analysis;

using Lucene.Net.Documents;

using Lucene.Net.Index;

using Lucene.Net.QueryParsers;

using Lucene.Net.Search;

using Lucene.Net.Store;

using Lucene.Net.Analysis.Cn;



namespace Lucene01

{

    class Program

    {

        static void Main(string[] args)

        {

            CreateLucenetIndex();

            ReadLucenetIndex();



        }







        /// <summary>

        /// 创建搜索

        /// </summary>

        protected static void CreateLucenetIndex()

        {

           //FSDirectory 建立基于文档索引   ，RAMDirectory 建立基于内存索引

          //   Directory dir = new FSDirectory();  //new RAMDirectory(); 

            Analyzer analyzer = new ChineseAnalyzer();

            IndexWriter writer = new IndexWriter("rhythmKIndex", analyzer, true); //new IndexWriter(dir,analyzer,true);

            //IndexReader.IndexExists("rhythmKIndex"); 可以判断是否存在索引文件 

             //故上面也可以用 new IndexWriter("rhythmkIndex",analyzer,true)

            Document doc = new Document();



            doc.Add(new Field("title", "这只是一个标题", Field.Store.YES, Field.Index.UN_TOKENIZED));

            doc.Add(new Field("content", "我是一个中国人！I am  a chinese boy~", Field.Store.YES, Field.Index.TOKENIZED));

          //  doc.Add(new Field("dd",DateField.DateToString(); ;

            writer.AddDocument(doc);

            

            doc = new Document();

            doc.Add(new Field("title", "学习Lucene.Net", Field.Store.YES, Field.Index.UN_TOKENIZED));

            doc.Add(new Field("content", "今天是我学习Lucene.Net第一天！", Field.Store.YES, Field.Index.TOKENIZED));

             doc.SetBoost(2.5f);//通过设置权重 优先级，让其排名靠前

           

            writer.AddDocument(doc);

            

            writer.Optimize();

            

            writer.Close();



        }

        /// <summary>

        /// 读取索引

        /// </summary>

        protected static void ReadLucenetIndex()

        {

            //Directory dir = FSDirectory.GetDirectory("path");//

            //dir = RAMDirectory(FSDirectory.GetDirectory("path"));//将指定文件下的索引读入内存

            IndexSearcher searcher = new IndexSearcher("rhythmKIndex");

            MultiFieldQueryParser mfq = new MultiFieldQueryParser(new string[] { "title", "content" }, new ChineseAnalyzer());

            Query query = mfq.Parse("是");



            Console.WriteLine(query.ToString());//打印索引语句

            Hits hit = searcher.Search(query);

            Console.WriteLine("总共获取到相关数据：{0}条,索引库总数：", hit.Length(), searcher.Reader.NumDocs());



            for (int i = 0; i < hit.Length(); i++)

            {

                int docId = hit.Id(i);

                string title = hit.Doc(i).Get("title");

                string content = hit.Doc(i).Get("content");

                Console.WriteLine("当前ID:{0}搜索到的标题：{1}内容:{2}", docId, title, content);



            }



            Console.ReadKey();



             

        }

    }

}

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