Lucene.Net学习

    
          很早就知道Lucene.Net但一直都没时间认真实践一下.最近项目需要.所以考虑学习一下Lucene.Net引擎.终于做出了第一个Demo感觉挺实用的.还不错.代码贴上.各位博友可参考学习一下.

        protected void btnAddIndex_Click(object sender, EventArgs e)
        {
            writer = new IndexWriter(Server.MapPath("index"), new Lucene.Net.Analysis.SimpleAnalyzer(), false);
            IndexDirectory(writer, new FileInfo(Server.MapPath("doc")));
            writer.Close();
        }
        public void IndexDirectory(IndexWriter writer, FileInfo file)
        {
            if (System.IO.Directory.Exists(file.FullName))
            {
                String[] files = System.IO.Directory.GetFileSystemEntries(file.FullName);
                if (files != null)
                {
                    for (int i = 0; i < files.Length; i++)
                    {
                        IndexDirectory(writer, new FileInfo(files[i])); 
                    }
                }
            }
            else if (file.Extension == ".txt" || file.Extension == ".htm" || file.Extension == ".html")
            {
                IndexFile(file, writer);
            }
        }

        private void IndexFile(FileInfo file, IndexWriter writer)
        {
            try
            {
                Document doc = new Document();
                txtListIndex.Text = txtListIndex.Text + "\n文件路径:" + file.FullName;
                doc.Add(Field.Keyword("filename", Path.GetFileName(file.FullName).Replace(file.Extension,"")));
                //doc.Add(Field.Text("contents", new StreamReader(file.FullName, System.Text.Encoding.Default)));
                doc.Add(Field.Text("contents", file.FullName));
                writer.AddDocument(doc);
            }
            catch (FileNotFoundException fnfe)
            {
                Response.Write(fnfe.Message);
            }
        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            IndexSearcher searcher = new IndexSearcher(Server.MapPath("index"));

            Query query = QueryParser.Parse("Linux", "filename", new Lucene.Net.Analysis.WhitespaceAnalyzer());

            Hits hits = searcher.Search(query);

            if (hits.Length() > 0)
            {
                for (int num = 0; num <= hits.Length() - 1; num++)
                {
                    Document docNew = hits.Doc(num);
                    txtListIndex.Text = txtListIndex.Text + "\n" + docNew.Get("contents");
                }
            }
        }