Lucene全文检索-从零开始（2）

1、lucene索引的创建

/// <Contents>
    /// 将 list数据传入创建索引
    /// </Contents>
    /// <param name="datalist"></param>
    /// <returns></returns>
    public bool CreateIndex(List<LuceneIndexArticle> datalist)
    {
        FSDirectory directory = FSDirectory.Open(new DirectoryInfo(IndexDic), new NativeFSLockFactory());
        IndexWriter writer = null;
        bool isUpdate = IndexReader.IndexExists(directory);
        if (isUpdate)
        {
            if (IndexWriter.IsLocked(directory))
            {
                IndexWriter.Unlock(directory);
            }
        }
        writer = new IndexWriter(IndexDic, PanGuAnalyzer, !isUpdate, IndexWriter.MaxFieldLength.LIMITED);//false表示追加（true表示删除之前的重新写入）

        foreach (LuceneIndexArticle data in datalist)
        {
            CreateIndex(writer, data);
        }
        writer.Optimize();
        writer.Close();
        return true;
    }
    public bool CreateIndex(IndexWriter writer, LuceneIndexArticle data)
    {
        try
        {
            if (data == null) return false;
            Document doc = new Document();
            Type type = data.GetType(); 
            PropertyInfo[] Propertys = type.GetProperties();
            for (int i = 0; i < Propertys.Length; i++)
            { 
                PropertyInfo pi = Propertys[i];
                string name = pi.Name;
                object objval = pi.GetValue(data, null);
                string value = objval == null ? "" : objval.ToString(); //值
                if (name == "ID")//id在写入索引时必是不分词，否则是模糊搜索和删除，会出现混乱
                {
                    doc.Add(new Field(name, value, Field.Store.YES, Field.Index.NOT_ANALYZED));//id不分词
                }
                else
                {
                    doc.Add(new Field(name, value, Field.Store.YES, Field.Index.ANALYZED));
                }
            }
            writer.AddDocument(doc);
        }
        catch (System.IO.FileNotFoundException fnfe)
        {
            throw fnfe;
        }
        return true;
    }

索引存放目录及盘古配置文件存放

 /// <Contents>
    /// 索引存放目录
    /// </Contents>
    /// <Contents>
    /// 盘古分词的配置文件
    /// </Contents>
    protected string PanGuXmlPath
    {
        get
        {
            return @"F:DCIMPanGu.xml";
        }
    }

 protected string IndexDic
    {
        get
        {
            return @"F:DCIM";
        }
    }

点击创建索引

索引创建完毕，这些是生成的磁盘文件。

下一节是如何从索引中检索数据