使用Lucene.NET实现站内搜索

using System;
using Lucene.Net.Store;
using Lucene.Net.Index;
using Lucene.Net.Analysis.PanGu;
using Lucene.Net.Documents;

namespace BLL
{
 class IndexHelper
 {
 /// <summary>
 /// 日志小助手
 /// </summary>
 static Common.LogHelper logger = new Common.LogHelper(typeof(SearchBLL));
 /// <summary>
 /// 索引保存的位置，保存在配置文件中从配置文件读取
 /// </summary>
 static string indexPath = Common.ConfigurationHelper.AppSettingMapPath("IndexPath");
 
 /// <summary>
 /// 创建索引文件或更新索引文件
 /// </summary>
 /// <param name="item">索引信息</param>
 public static void CreateIndex(Model.HelperModel.IndexFileHelper item)
 {
 try
 {
 //索引存储库
 FSDirectory directory = FSDirectory.Open(new System.IO.DirectoryInfo(indexPath), new NativeFSLockFactory());
 //判断索引是否存在
 bool isUpdate = IndexReader.IndexExists(directory);
 if (isUpdate)
 {
 //如果索引目录被锁定（比如索引过程中程序异常退出），则首先解锁
 if (IndexWriter.IsLocked(directory))
 {
 //解锁索引库
 IndexWriter.Unlock(directory);
 }
 }
 //创建IndexWriter对象，添加索引
 IndexWriter writer = new IndexWriter(directory, new PanGuAnalyzer(), !isUpdate, Lucene.Net.Index.IndexWriter.MaxFieldLength.UNLIMITED);
 //获取新闻 title部分
 string title = item.FileTitle;
 //获取新闻主内容
 string body = item.FileContent;
 //为避免重复索引，所以先删除number=i的记录，再重新添加
 //尤其是更新的话，更是必须要先删除之前的索引
 writer.DeleteDocuments(new Term("id", item.FileName));
 //创建索引文件 Document
 Document document = new Document();
 //只有对需要全文检索的字段才ANALYZED
 //添加id字段
 document.Add(new Field("id", item.FileName, Field.Store.YES, Field.Index.NOT_ANALYZED));
 //添加title字段
 document.Add(new Field("title", title, Field.Store.YES, Field.Index.NOT_ANALYZED));
 //添加body字段
 document.Add(new Field("body", body, Field.Store.YES, Field.Index.ANALYZED, Lucene.Net.Documents.Field.TermVector.WITH_POSITIONS_OFFSETS));
 //添加url字段
 document.Add(new Field("url", item.FilePath, Field.Store.YES, Field.Index.NOT_ANALYZED));
 //写入索引库
 writer.AddDocument(document);
 //关闭资源
 writer.Close();
 //不要忘了Close，否则索引结果搜不到
 directory.Close();
 //记录日志
 logger.Debug(String.Format("索引{0}创建成功",item.FileName));
 }
 catch (SystemException ex)
 {
 //记录错误日志
 logger.Error(ex);
 throw;
 }
 catch (Exception ex)
 {
 //记录错误日志
 logger.Error(ex);
 throw;
 }
 }

 /// <summary>
 /// 根据id删除相应索引
 /// </summary>
 /// <param name="guid">要删除的索引id</param>
 public static void DeleteIndex(string guid)
 {
 try
 {
 ////索引存储库
 FSDirectory directory = FSDirectory.Open(new System.IO.DirectoryInfo(indexPath), new NativeFSLockFactory());
 //判断索引库是否存在索引
 bool isUpdate = IndexReader.IndexExists(directory);
 if (isUpdate)
 {
 //如果索引目录被锁定（比如索引过程中程序异常退出），则首先解锁
 if (IndexWriter.IsLocked(directory))
 {
 IndexWriter.Unlock(directory);
 }
 }
 IndexWriter writer = new IndexWriter(directory, new PanGuAnalyzer(), !isUpdate, Lucene.Net.Index.IndexWriter.MaxFieldLength.UNLIMITED);
 //删除索引文件
 writer.DeleteDocuments(new Term("id", guid));
 writer.Close();
 directory.Close();//不要忘了Close，否则索引结果搜不到
 logger.Debug(String.Format("删除索引{0}成功", guid));
 }
 catch (Exception ex)
 {
 //记录日志
 logger.Error(ex);
 //抛出异常
 throw;
 }
 }
 }
}

using Lucene.Net.Analysis;
using Lucene.Net.Analysis.PanGu;
using Lucene.Net.Documents;
using Lucene.Net.Index;
using Lucene.Net.Search;
using Lucene.Net.Store;
using Model.HelperModel;
using System;
using System.Collections.Generic;

namespace BLL
{
 public static class SearchBLL
 {
 //一个类中可能会有多处

namespace Model.HelperModel
{
 public class SearchResult
 {
 public string Number { get; set; }

 public string Title { get; set; }

 public string BodyPreview { get; set; }

 public string Url { get; set; }
 }
}