Lucene全文检索-从零开始（2）

1、lucene索引的创建

 1 /// <Contents>
 2     /// 将 list数据传入创建索引
 3     /// </Contents>
 4     /// <param name="datalist"></param>
 5     /// <returns></returns>
 6     public bool CreateIndex(List<LuceneIndexArticle> datalist)
 7     {
 8         FSDirectory directory = FSDirectory.Open(new DirectoryInfo(IndexDic), new NativeFSLockFactory());
 9         IndexWriter writer = null;
10         bool isUpdate = IndexReader.IndexExists(directory);
11         if (isUpdate)
12         {
13             if (IndexWriter.IsLocked(directory))
14             {
15                 IndexWriter.Unlock(directory);
16             }
17         }
18         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）
19 
20         foreach (LuceneIndexArticle data in datalist)
21         {
22             CreateIndex(writer, data);
23         }
24         writer.Optimize();
25         writer.Close();
26         return true;
27     }
28     public bool CreateIndex(IndexWriter writer, LuceneIndexArticle data)
29     {
30         try
31         {
32             if (data == null) return false;
33             Document doc = new Document();
34             Type type = data.GetType(); 
35             PropertyInfo[] Propertys = type.GetProperties();
36             for (int i = 0; i < Propertys.Length; i++)
37             { 
38                 PropertyInfo pi = Propertys[i];
39                 string name = pi.Name;
40                 object objval = pi.GetValue(data, null);
41                 string value = objval == null ? "" : objval.ToString(); //值
42                 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
43                 {
44                     doc.Add(new Field(name, value, Field.Store.YES, Field.Index.NOT_ANALYZED));//id不分词
45                 }
46                 else
47                 {
48                     doc.Add(new Field(name, value, Field.Store.YES, Field.Index.ANALYZED));
49                 }
50             }
51             writer.AddDocument(doc);
52         }
53         catch (System.IO.FileNotFoundException fnfe)
54         {
55             throw fnfe;
56         }
57         return true;
58     }

索引存放目录及盘古配置文件存放

 1  /// <Contents>
 2     /// 索引存放目录
 3     /// </Contents>
 4     /// <Contents>
 5     /// 盘古分词的配置文件
 6     /// </Contents>
 7     protected string PanGuXmlPath
 8     {
 9         get
10         {
11             return @"F:DCIMPanGu.xml";
12         }
13     }

1  protected string IndexDic
2     {
3         get
4         {
5             return @"F:DCIM";
6         }
7     }

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