ASP.NET基于Ajax+Lucene构建搜索引擎的设计和实现

using System;
using System.Collections.Generic;
using System.Linq;
using Lucene.Net.Analysis;
using Lucene.Net.Documents;
using Lucene.Net.Index;
using Lucene.Net.QueryParsers;
using Lucene.Net.Search;
using Lucene.Net.Store;

public class LuceneSearchEngine
{
    private Directory directory;
    private IndexSearcher searcher;

    public LuceneSearchEngine(string indexPath)
    {
        directory = FSDirectory.Open(indexPath);
        searcher = new IndexSearcher(IndexReader.Open(directory));
    }

    public void CreateIndex(IEnumerable<string> documents, string fieldName)
    {
        Analyzer analyzer = new StandardAnalyzer();
        IndexWriter writer = new IndexWriter(directory, analyzer);

        foreach (var document in documents)
        {
            Document doc = new Document();
            doc.Add(new Field(fieldName, document, Field.Store.YES, Field.Index.ANALYZED));
            writer.AddDocument(doc);
        }

        writer.Optimize();
        writer.Close();
    }

    public List<string> Search(string queryString)
    {
        QueryParser parser = new QueryParser(Version.LUCENE_30, "content", new StandardAnalyzer());
        Query query = parser.Parse(queryString);

        TopDocs topDocs = searcher.Search(query, 10);
        ScoreDoc[] scoreDocs = topDocs.ScoreDocs;

        List<string> results = new List<string>();
        foreach (ScoreDoc scoreDoc in scoreDocs)
        {
            Document doc = searcher.Doc(scoreDoc.Doc);
            results.Add(doc.GetField("content").StringValue);
        }

        return results;
    }
}