lucene.Net学习一

建索引的代码，代码里面有注释

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;

using Lucene.Net.Index;
using Lucene.Net.Store;
using Lucene.Net.Util;
using Lucene.Net.Analysis.Standard;
using Lucene.Net.Documents;



namespace TestFileIndex
{
    class Program
    {
        static void Main(string[] args)
        {
            FileInfo index_dir = new FileInfo(@"F:\lucene_index");//索引文件存放的路径
            FileInfo doc_dir = new FileInfo(@"F:\doc");//需要创建的索引的原始文件
            //实例化索引对象
            IndexWriter IW = new IndexWriter(FSDirectory.Open(index_dir), new StandardAnalyzer(Lucene.Net.Util.Version.LUCENE_CURRENT), true, IndexWriter.MaxFieldLength.LIMITED);
            IndexDocs(IW,doc_dir); //创建索引        
            IW.Optimize();
            IW.Close();
        }

        private static void IndexDocs(IndexWriter writer, FileInfo file) 
        {
            if (System.IO.Directory.Exists(file.FullName))//判断指定的目录是否存在，注意不是文件的路径
            {
                System.String[] files = System.IO.Directory.GetFileSystemEntries(file.FullName);//返回指定目录中的所有文件和子目录
                if (files != null)
                {
                    for (int i = 0; i < files.Length; i++)
                    {
                        IndexDocs(writer, new System.IO.FileInfo(files[i]));//递归调用
                    }
                }
            }
            else
            {
                System.Console.Out.WriteLine("adding " + file.FullName);
                try
                {
                    Document d = new Document();
                    d.Add(new Field("path",file.FullName, Field.Store.YES, Field.Index.NOT_ANALYZED));
                    d.Add(new Field("contents", new System.IO.StreamReader(file.FullName, System.Text.Encoding.Default)));
                    writer.AddDocument(d);
                }               
                catch (System.IO.FileNotFoundException fnfe)
                {
                    Console.WriteLine(fnfe.Message);
                }
            }
        }


    }
}

查询索引的代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using System.IO;
using Lucene.Net.Store;
using Lucene.Net.Index;
using Lucene.Net.Search;
using Lucene.Net.Documents;

namespace TestSearchFileIndex
{
    class Program
    {
        static void Main(string[] args)
        {
            string indexdir=@"F:\lucene_index";//索引文件存放的路径
            string q = "文";
            searchindex(indexdir, q);
        }

        private static void searchindex(string f,string query) 
        {
        //打开索引文件，并将索引文件的相关信息读入
            Lucene.Net.Store.Directory dir = Lucene.Net.Store.FSDirectory.Open(new System.IO.DirectoryInfo(f));
            IndexSearcher IS = new IndexSearcher(dir);//打开索引  

            Term t = new Term("contents", query);//构建一个Term对象
            Query quer = new TermQuery(t);//构建一个Query对象
         
            TopDocs hits = IS.Search(quer, 10);//检索

            for (int i = 0; i < hits.scoreDocs.Length; i++)
            {
                Document doc = IS.Doc(hits.scoreDocs[i].doc);//检索匹配到的文档
                Console.WriteLine(doc.Get("path"));//显示文件路径
            }
        
        } 
    }
}

  注意这里面的字符编码，否则查询的时候查不到      d.Add(new Field("contents", new StreamReader(file.FullName, System.Text.Encoding.Default)));