lucene.net helper类【结合盘古分词进行搜索的小例子（分页功能）】

转自：http://blog.csdn.net/pukuimin1226/article/details/17558247

添加：2013-12-25

更新：2013-12-26 新增分页功能。

更新：2013-12-27 新增按分类查询功能，调整索引行新增记录的图片字段。

最新盘古分词dll和词典管理工具下载：http://pangusegment.codeplex.com/

词典下载：http://pangusegment.codeplex.com/releases/view/47411

Lucene.net下载：http://lucenenet.apache.org/download.cgi

//封装类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using Lucene.Net.Analysis;
using Lucene.Net.Index;
using Lucene.Net.Documents;
using System.Reflection;
using Lucene.Net.QueryParsers;
using Lucene.Net.Search;
namespace SearchTest
{
/// <summary>
/// 盘古分词在lucene.net中的使用帮助类
/// 调用PanGuLuceneHelper.instance
/// </summary>
public class PanGuLuceneHelper
{
private PanGuLuceneHelper() { }
#region 单一实例
private static PanGuLuceneHelper _instance = null;
/// <summary>
/// 单一实例
/// </summary>
public static PanGuLuceneHelper instance
{
get
{
if (_instance == null) _instance = new PanGuLuceneHelper();
return _instance;
}
}
#endregion
#region 分词测试
/// <summary>
/// 分词测试
/// </summary>
/// <param name=”keyword”></param>
/// <returns></returns>
public string Token(string keyword)
{
string ret = “”;
System.IO.StringReader reader = new System.IO.StringReader(keyword);
Lucene.Net.Analysis.TokenStream ts = analyzer.TokenStream(keyword, reader);
bool hasNext = ts.IncrementToken();
Lucene.Net.Analysis.Tokenattributes.ITermAttribute ita;
while (hasNext)
{
ita = ts.GetAttribute<Lucene.Net.Analysis.Tokenattributes.ITermAttribute>();
ret += ita.Term + “|”;
hasNext = ts.IncrementToken();
}
ts.CloneAttributes();
reader.Close();
analyzer.Close();
return ret;
}
#endregion
#region 创建索引
/// <summary>
/// 创建索引
/// </summary>
/// <param name=”datalist”></param>
/// <returns></returns>
public bool CreateIndex(List<MySearchUnit> datalist)
{
IndexWriter writer = null;
try
{
writer = new IndexWriter(directory_luce, analyzer, false, IndexWriter.MaxFieldLength.LIMITED);//false表示追加（true表示删除之前的重新写入）
}
catch
{
writer = new IndexWriter(directory_luce, analyzer, true, IndexWriter.MaxFieldLength.LIMITED);//false表示追加（true表示删除之前的重新写入）
}
foreach (MySearchUnit data in datalist)
{
CreateIndex(writer, data);
}
writer.Optimize();
writer.Dispose();
return true;
}
public bool CreateIndex(IndexWriter writer, MySearchUnit data)
{
try
{
if (data == null) return false;
Document doc = new Document();
Type type = data.GetType();//assembly.GetType(“Reflect_test.PurchaseOrderHeadManageModel”, true, true); //命名空间名称 + 类名
//创建类的实例
//object obj = Activator.CreateInstance(type, true);
//获取公共属性
PropertyInfo[] Propertys = type.GetProperties();
for (int i = 0; i < Propertys.Length; i++)
{
//Propertys[i].SetValue(Propertys[i], i, null); //设置值
PropertyInfo pi = Propertys[i];
string name=pi.Name;
object objval = pi.GetValue(data, null);
string value = objval == null ? “” : objval.ToString(); //值
if (name == “id” || name==”flag” )//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;
}
#endregion
#region 在title和content字段中查询数据
/// <summary>
/// 在title和content字段中查询数据
/// </summary>
/// <param name=”keyword”></param>
/// <returns></returns>
public List<MySearchUnit> Search(string keyword)
{
string[] fileds = { “title”, “content” };//查询字段
//Stopwatch st = new Stopwatch();
//st.Start();
QueryParser parser = null;// new QueryParser(Lucene.Net.Util.Version.LUCENE_30, field, analyzer);//一个字段查询
parser = new MultiFieldQueryParser(version, fileds, analyzer);//多个字段查询
Query query = parser.Parse(keyword);
int n = 1000;
IndexSearcher searcher = new IndexSearcher(directory_luce, true);//true-表示只读
TopDocs docs = searcher.Search(query, (Filter)null, n);
if (docs == null || docs.TotalHits == 0)
{
return null;
}
else
{
List<MySearchUnit> list = new List<MySearchUnit>();
int counter = 1;
foreach (ScoreDoc sd in docs.ScoreDocs)//遍历搜索到的结果
{
try
{
Document doc = searcher.Doc(sd.Doc);
string id = doc.Get(“id”);
string title = doc.Get(“title”);
string content = doc.Get(“content”);
string flag = doc.Get(“flag”);
string imageurl = doc.Get(“imageurl”);
string updatetime = doc.Get(“updatetime”);
string createdate = doc.Get(“createdate”);
PanGu.HighLight.SimpleHTMLFormatter simpleHTMLFormatter = new PanGu.HighLight.SimpleHTMLFormatter(“”, “”);
PanGu.HighLight.Highlighter highlighter = new PanGu.HighLight.Highlighter(simpleHTMLFormatter, new PanGu.Segment());
highlighter.FragmentSize = 50;
content = highlighter.GetBestFragment(keyword, content);
string titlehighlight = highlighter.GetBestFragment(keyword, title);
if (titlehighlight != “”) title = titlehighlight;
list.Add(new MySearchUnit(id, title, content, flag,imageurl, updatetime));
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
counter++;
}
return list;
}
//st.Stop();
//Response.Write(“查询时间：” + st.ElapsedMilliseconds + ” 毫秒 ”);
}
#endregion
#region 在不同的分类下再根据title和content字段中查询数据(分页)
/// <summary>
/// 在不同的类型下再根据title和content字段中查询数据(分页)
/// </summary>
/// <param name=”_flag”>分类,传空值查询全部</param>
/// <param name=”keyword”></param>
/// <param name=”PageIndex”></param>
/// <param name=”PageSize”></param>
/// <param name=”TotalCount”></param>
/// <returns></returns>
public List<MySearchUnit> Search(string _flag,string keyword, int PageIndex, int PageSize, out int TotalCount)
{
if (PageIndex < 1) PageIndex = 1;
//Stopwatch st = new Stopwatch();
//st.Start();
BooleanQuery bq = new BooleanQuery();
if (_flag != “”)
{
QueryParser qpflag = new QueryParser(version, “flag”, analyzer);
Query qflag = qpflag.Parse(_flag);
bq.Add(qflag, Occur.MUST);//与运算
}
if (keyword != “”)
{
string[] fileds = { “title”, “content” };//查询字段
QueryParser parser = null;// new QueryParser(version, field, analyzer);//一个字段查询
parser = new MultiFieldQueryParser(version, fileds, analyzer);//多个字段查询
Query queryKeyword = parser.Parse(keyword);
bq.Add(queryKeyword, Occur.MUST);//与运算
}
TopScoreDocCollector collector = TopScoreDocCollector.Create(PageIndex * PageSize, false);
IndexSearcher searcher = new IndexSearcher(directory_luce, true);//true-表示只读
searcher.Search(bq, collector);
if (collector == null || collector.TotalHits == 0)
{
TotalCount = 0;
return null;
}
else
{
int start = PageSize * (PageIndex – 1);
//结束数
int limit = PageSize;
ScoreDoc[] hits = collector.TopDocs(start, limit).ScoreDocs;
List<MySearchUnit> list = new List<MySearchUnit>();
int counter = 1;
TotalCount = collector.TotalHits;
foreach (ScoreDoc sd in hits)//遍历搜索到的结果
{
try
{
Document doc = searcher.Doc(sd.Doc);
string id = doc.Get(“id”);
string title = doc.Get(“title”);
string content = doc.Get(“content”);
string flag = doc.Get(“flag”);
string imageurl = doc.Get(“imageurl”);
string updatetime = doc.Get(“updatetime”);
PanGu.HighLight.SimpleHTMLFormatter simpleHTMLFormatter = new PanGu.HighLight.SimpleHTMLFormatter(“”, “”);
PanGu.HighLight.Highlighter highlighter = new PanGu.HighLight.Highlighter(simpleHTMLFormatter, new PanGu.Segment());
highlighter.FragmentSize = 50;
content = highlighter.GetBestFragment(keyword, content);
string titlehighlight = highlighter.GetBestFragment(keyword, title);
if (titlehighlight != “”) title = titlehighlight;
list.Add(new MySearchUnit(id, title, content, flag,imageurl, updatetime));
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
counter++;
}
return list;
}
//st.Stop();
//Response.Write(“查询时间：” + st.ElapsedMilliseconds + ” 毫秒 ”);
}
#endregion
#region 删除索引数据（根据id）
/// <summary>
/// 删除索引数据（根据id）
/// </summary>
/// <param name=”id”></param>
/// <returns></returns>
public bool Delete(string id)
{
bool IsSuccess = false;
Term term = new Term(“id”, id);
//Analyzer analyzer = new StandardAnalyzer(Lucene.Net.Util.Version.LUCENE_30);
//Version version = new Version();
//MultiFieldQueryParser parser = new MultiFieldQueryParser(version, new string[] { “name”, “job” }, analyzer);//多个字段查询
//Query query = parser.Parse(“小王”);
//IndexReader reader = IndexReader.Open(directory_luce, false);
//reader.DeleteDocuments(term);
//Response.Write(“删除记录结果： ” + reader.HasDeletions + “ ”);
//reader.Dispose();
IndexWriter writer = new IndexWriter(directory_luce, analyzer, false, IndexWriter.MaxFieldLength.LIMITED);
writer.DeleteDocuments(term); // writer.DeleteDocuments(term)或者writer.DeleteDocuments(query);
////writer.DeleteAll();
writer.Commit();
//writer.Optimize();//
IsSuccess = writer.HasDeletions();
writer.Dispose();
return IsSuccess;
}
#endregion
#region 删除全部索引数据
/// <summary>
/// 删除全部索引数据
/// </summary>
/// <returns></returns>
public bool DeleteAll()
{
bool IsSuccess = true;
try
{
IndexWriter writer = new IndexWriter(directory_luce, analyzer, false, IndexWriter.MaxFieldLength.LIMITED);
writer.DeleteAll();
writer.Commit();
//writer.Optimize();//
IsSuccess = writer.HasDeletions();
writer.Dispose();
}
catch
{
IsSuccess = false;
}
return IsSuccess;
}
#endregion
#region directory_luce
private Lucene.Net.Store.Directory _directory_luce = null;
/// <summary>
/// Lucene.Net的目录-参数
/// </summary>
public Lucene.Net.Store.Directory directory_luce
{
get
{
if (_directory_luce == null) _directory_luce = Lucene.Net.Store.FSDirectory.Open(directory);
return _directory_luce;
}
}
#endregion
#region directory
private System.IO.DirectoryInfo _directory = null;
/// <summary>
/// 索引在硬盘上的目录
/// </summary>
public System.IO.DirectoryInfo directory
{
get
{
if (_directory == null)
{
string dirPath = AppDomain.CurrentDomain.BaseDirectory + “SearchIndex”;
if (System.IO.Directory.Exists(dirPath) == false) _directory = System.IO.Directory.CreateDirectory(dirPath);
else _directory = new System.IO.DirectoryInfo(dirPath);
}
return _directory;
}
}
#endregion
#region analyzer
private Analyzer _analyzer = null;
/// <summary>
/// 分析器
/// </summary>
public Analyzer analyzer
{
get
{
//if (_analyzer == null)
{
_analyzer = new Lucene.Net.Analysis.PanGu.PanGuAnalyzer();//盘古分词分析器
//_analyzer = new StandardAnalyzer(Lucene.Net.Util.Version.LUCENE_30);//标准分析器
}
return _analyzer;
}
}
#endregion
#region version
private static Lucene.Net.Util.Version _version = Lucene.Net.Util.Version.LUCENE_30;
/// <summary>
/// 版本号枚举类
/// </summary>
public Lucene.Net.Util.Version version
{
get
{
return _version;
}
}
#endregion
}
#region 索引的一个行单元，相当于数据库中的一行数据
/// <summary>
/// 索引的一个行单元，相当于数据库中的一行数据
/// </summary>
public class MySearchUnit
{
public MySearchUnit(string _id, string _title, string _content, string _flag, string _imageurl, string _updatetime)
{
this.id = _id;
this.title = _title;
this.content = _content;
this.flag = _flag;
this.imageurl = _imageurl;
this.updatetime = _updatetime;
}
/// <summary>
/// 唯一的id号
/// </summary>
public string id { get; set; }
/// <summary>
/// 标题
/// </summary>
public string title { get; set; }
/// <summary>
/// 内容
/// </summary>
public string content { get; set; }
/// <summary>
/// 其他信息
/// </summary>
public string flag { get; set; }
/// <summary>
/// 图片路径
/// </summary>
public string imageurl { get; set; }
/// <summary>
/// 时间
/// </summary>
public string updatetime { get; set; }
}
#endregion
}

//调用测试

protected void Page_Load(object sender, EventArgs e)
{
//PanGuLuceneHelper.instance.DeleteAll();//删除全部
//PanGuLuceneHelper.instance.Delete(“1d”);//根据id删除
bool exec = false;
if (exec)
{
List<MySearchUnit> list = new List<MySearchUnit>();
list.Add(new MySearchUnit(“1a”, “标题小王”, “今天是小王的生日，大家都很高兴去他家喝酒，玩了一整天。”, new Random().Next(1, 10).ToString(), “”, “”));
list.Add(new MySearchUnit(“1b”, “标题小张”, “今天是小张的生日，大家都很高兴去他家喝酒，玩了几天。”, new Random().Next(1, 10).ToString(), “”, “”));
list.Add(new MySearchUnit(“1c”, “标题小王”, “今天是小王的生日，大家都很高兴去他家喝酒，玩了一整天。”, new Random().Next(1, 10).ToString(), “”, “”));
list.Add(new MySearchUnit(“1d”, “标题小张”, “今天是小张的生日，大家都很高兴去他家喝酒，玩了几天。”, new Random().Next(1, 10).ToString(), “”, “”));
PanGuLuceneHelper.instance.CreateIndex(list);//添加索引
}
int count = 0;
int PageIndex=2;
int PageSize=4;
string html_content = “”;
List<MySearchUnit> searchlist = PanGuLuceneHelper.instance.Search(“3″,”小王生日”,PageIndex,PageSize,out count);
html_content+=(“查询结果：” + count + “条数据 ”);
if (searchlist == null || searchlist.Count==0)
{
html_content += (“未查询到数据。 ”);
}
else
{
foreach (MySearchUnit data in searchlist)
{
html_content += (string.Format(“id：{0},title：{1},content：{2},flag：{3},updatetime：{4} ”, data.id, data.title, data.content, data.flag, data.updatetime));
}
}
html_content += (PanGuLuceneHelper.instance.version);
div_content.InnerHtml = html_content;
}