/// <summary>
///
/// </summary>
/// <param name="path">文件夹，索引存放位置</param>
/// <param name="sources"></param>
static void CreateIndex(string path, List <Meta> sources)
{
var root = new DirectoryInfo(path);
var fsLockFactory = new NativeFSLockFactory();
using (FSDirectory fsRoot = FSDirectory.Open(root, fsLockFactory))
{
//创建向索引库写操作对象
//使用IndexWriter打开directory时会自动对索引库文件上锁
//Analyzer analyzer = new SimpleAnalyzer();
Analyzer analyzer = new PanGuAnalyzer();
using (IndexWriter writer = new IndexWriter(fsRoot, analyzer, !IndexReader.IndexExists(fsRoot), IndexWriter.MaxFieldLength.UNLIMITED))
{
foreach (var source in sources)
{
Document document = new Document();
document.Add(new Field("Title", source.Title, Field.Store.YES, Field.Index.ANALYZED, Field.TermVector.WITH_POSITIONS_OFFSETS));
document.Add(new Field("Url", source.Url, Field.Store.YES, Field.Index.NOT_ANALYZED));
document.Add(new Field("Content", source.Content, Field.Store.YES, Field.Index.ANALYZED, Field.TermVector.WITH_POSITIONS_OFFSETS));
writer.AddDocument(document);
}
}
}
}
static DirectoryTracker()
{
DefaultLockFactory = d =>
{
var nativeFsLockFactory = new NativeFSLockFactory(d);
nativeFsLockFactory.SetLockPrefix(null);
return(nativeFsLockFactory);
};
}
static DirectoryFactory()
{
DefaultLockFactory = d =>
{
var nativeFsLockFactory = new NativeFSLockFactory(d);
nativeFsLockFactory.LockPrefix = null;
return(nativeFsLockFactory);
};
}
static List <Meta> Search(string path, string keywords)
{
var list = new List <Meta>();
var root = new DirectoryInfo(path);
var fsLockFactory = new NativeFSLockFactory();
FSDirectory fsRoot = FSDirectory.Open(root, fsLockFactory);
IndexReader reader = IndexReader.Open(fsRoot, true);
IndexSearcher searcher = new IndexSearcher(reader);
PhraseQuery query = new PhraseQuery();
var words = SplitKeywords(keywords);
foreach (var word in words)
{
query.Add(new Term("Content", word));
}
query.Slop = 100;
TopScoreDocCollector collector = TopScoreDocCollector.Create(200, true);
searcher.Search(query, null, collector);
ScoreDoc[] docs = collector.TopDocs(0, collector.TotalHits).ScoreDocs;
foreach (var doc in docs)
{
var document = searcher.Doc(doc.Doc);
Meta meta = new Meta();
meta.Title = document.Get("Title");
meta.Url = document.Get("Url");
meta.Content = document.Get("Content");
list.Add(meta);
}
return(list);
}
