Lucene.NET开发——信息检索与索引记录删除
信息检索类
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Lucene.Net.Index;
using Lucene.Net.Search;
using Lucene.Net.Documents;
using Lucene.Net.Store;
using Lucene.Net.Analysis.Standard;
namespace NewBeeServer
{
static class Searcher
{
static Hits hits;
//开始检索，返回检索到的结果数
public static int SearchKeyWords(string encryptedKeyWord, string searchType)
{
//索引器建立
IndexSearcher searcher = new IndexSearcher(Application.StartupPath + "\\users\\" + UserName.userName + "\\index", false);
PhraseQuery totalQuery = new PhraseQuery();
char[] seperator = { ' ' };
string[] keywords = encryptedKeyWord.Split(seperator);
foreach (string keyword in keywords)
{
totalQuery.Add(new Term(searchType,
keyword));
}
totalQuery.SetSlop(5);
//获得搜索结果对象
hits = searcher.Search(totalQuery);
//获取查询到的结果数
return hits.Length();
}
//开始手机语句检索
public static string PGetResultByIndex(int i)
{
StringBuilder sb = new StringBuilder();
try
{
Document doc = hits.Doc(i);
//获得filename
Field field = doc.GetField("filename");
string filename = field.StringValue();
sb.Append("NAME#" + filename +
"#\n");
//获得filedate
field = doc.GetField("filedate");
string filedate = field.StringValue();
sb.Append("DATE#" + filedate +
"#\n");
/*//获得filetag
field =
doc.GetField("filesize");
string filesize =
field.StringValue();
sb.Append("SIZE#" +
filesize + "#");*/
}
catch (Exception ee)
{
MessageBox.Show(ee.Message);
}
return sb.ToString();
}
//开始语句检索(catch置空)
public static string GetResultByIndex(int i)
{
StringBuilder sb = new StringBuilder();
try
{
Document doc = hits.Doc(i);
//获得filename
Field field = doc.GetField("filename");
string filename = field.StringValue();
sb.Append("NAME#" + filename +
"#");
//获得digest
field = doc.GetField("digest");
string digest = field.StringValue();
sb.Append("DIGEST#" + digest +
"#");
//获得filedate
field = doc.GetField("filedate");
string filedate = field.StringValue();
sb.Append("DATE#" + filedate +
"#");
//获得filesize
field = doc.GetField("filesize");
string filesize = field.StringValue();
sb.Append("SIZE#" + filesize +
"#");
//获得filetag
field = doc.GetField("filetag");
string filetag = field.StringValue();
sb.Append("TAG#" + filetag +
"#");
}
catch (Exception ee)
{
//MessageBox.Show(ee.Message);
}
return sb.ToString();
}
//删除索引(catch置空)
public static bool DeleteIndexByFilename(string fileName)
{
string noExtFilename =
fileName.Substring(0, fileName.Length - 4);
try
{
string path = Application.StartupPath + "\\users\\" + UserName.userName + "\\index";
Directory directory = FSDirectory.GetDirectory(path, false);
IndexReader reader = IndexReader.Open(directory);
Term term = new Term("filename", noExtFilename);
int r = reader.DeleteDocuments(term);
reader.Close();
directory.Close();
IndexWriter indexWriter = new IndexWriter(path,
new StandardAnalyzer(),
false);
indexWriter.Optimize();
indexWriter.Close();
return true;
}
catch (Exception ee)
{
//MessageBox.Show(ee.Message);
}
return false;
}
}
}
