Lucence.Net学习+盘古分词

创建索引库

//读取文件，存储到索引库

public string CreateDatebase()

{

//获取索引库的路径

var indexPath = AppDomain.CurrentDomain.BaseDirectory + ConfigurationManager.AppSettings["IndexDateBase"];

FSDirectory directory = FSDirectory.Open(new DirectoryInfo(indexPath), new NoLockFactory());

IndexReader reader = IndexReader.Open(directory, true);

var searcher = new IndexSearcher(reader);

//搜索条件

var query = new PhraseQuery();

foreach (string word in GetPanGuAnalyzer(str))//先用空格，让用户去分词，空格分隔的就是词“计算机专业”

{

query.Add(new Term("body", word));

}

//组成词的字之间可以允许的距离

query.SetSlop(5);

TopScoreDocCollector collector = TopScoreDocCollector.create(1000, true);

searcher.Search(query, null, collector);//根据query查询条件进行查询，查询结果放入collector容器

ScoreDoc[] docs = collector.TopDocs(0, collector.GetTotalHits()).scoreDocs;//得到所有查询结果中的文档,GetTotalHits():表示总条数 TopDocs(300, 20);//表示得到300（从300开始），到320（结束）的文档内容.

var list = new List<string>();

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

{

int docId = docs[i].doc;//得到查询结果文档的id（Lucene内部分配的id）

Document doc = searcher.Doc(docId);//找到文档id对应的文档详细信息

var _str = doc.Get("body");

list.Add(_str);

}

ViewBag.List = list;

return View();

}

进行搜索

public ActionResult List(string str)

{

//获取索引库的路径

var indexPath = AppDomain.CurrentDomain.BaseDirectory + ConfigurationManager.AppSettings["IndexDateBase"];

FSDirectory directory = FSDirectory.Open(new DirectoryInfo(indexPath), new NoLockFactory());

IndexReader reader = IndexReader.Open(directory, true);

var searcher = new IndexSearcher(reader);

//搜索条件

var query = new PhraseQuery();

foreach (string word in GetPanGuAnalyzer(str))//先用空格，让用户去分词，空格分隔的就是词“计算机专业”

{

query.Add(new Term("body", word));

}

//组成词的字之间可以允许的距离

query.SetSlop(5);

TopScoreDocCollector collector = TopScoreDocCollector.create(1000, true);

searcher.Search(query, null, collector);//根据query查询条件进行查询，查询结果放入collector容器

var list = new List<string>();

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

{

int docId = docs[i].doc;//得到查询结果文档的id（Lucene内部分配的id）

Document doc = searcher.Doc(docId);//找到文档id对应的文档详细信息

var _str = doc.Get("body");

list.Add(_str);

}

ViewBag.List = list;

return View();

}

/// 对传递过来的字符串进行盘古分词

/// </summary>

/// <returns></returns>

public static List<string> GetPanGuAnalyzer(string txt)

{

List<string> list = new List<string>();

Analyzer analyzer = new PanGuAnalyzer();

TokenStream tokenStream = analyzer.TokenStream("", new StringReader(txt));

Lucene.Net.Analysis.Token token = null;

while ((token = tokenStream.Next()) != null)

{

list.Add(token.TermText());

}

return list;

}

IndexReader 删除数据

//获取字典

var directory = LucenceHelp.GetDirectory();

//先删除数据

IndexReader reader = IndexReader.Open(directory);

reader.DeleteDocuments(new Term("number", "0"));

reader.IsOptimized();

reader.Close();

IndexWriter 删除数据

//获取字典

var directory = LucenceHelp.GetDirectory();

var writer = new IndexWriter(directory, new PanGuAnalyzer(), false, IndexWriter.MaxFieldLength.UNLIMITED);

//删除的是与要匹配的关键字相关的文件

var term = new Term("body", name);

//删除的是文件名为13的文件

//var term = new Term("number", "13");

writer.DeleteDocuments(term);

writer.Optimize();

writer.Close();

修改索引

Analyzer analyzer = new PanGuAnalyzer();

//获取字典

var directory = LucenceHelp.GetDirectory();

//先删除数据

IndexReader reader = IndexReader.Open(directory);

reader.DeleteDocuments(new Term("number", "0"));

reader.Close();

//再添加数据

IndexWriter writer = new IndexWriter(directory, analyzer, false, IndexWriter.MaxFieldLength.LIMITED);

Document document = new Document();

document.Add(new Field("number", "0", Field.Store.YES, Field.Index.ANALYZED));

document.Add(new Field("body", "如家快捷酒店-0", Field.Store.YES, Field.Index.ANALYZED));

writer.AddDocument(document);

writer.Close();

要添加的文件

巴特西

Lucence.Net学习+盘古分词

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