/// <summary>
/// 获取
/// </summary>
/// <param name="bQuery"></param>
/// <param name="maxNum">查询条数</param>
private List <LiteNewsModel> GetSearchResult(BooleanQuery bQuery, Dictionary <string, string> dicKeywords, int maxNum = 100)
{
var list = new List <LiteNewsModel>();
IndexSearcher search = new IndexSearcher(Direcotry, true);
// Stopwatch stopwatch = Stopwatch.StartNew();
//SortField构造函数第三个字段true为降序,false为升序
Sort sort = new Sort(new SortField[] {
SortField.FIELD_SCORE, new SortField("title", SortField.SCORE, true),
SortField.FIELD_SCORE, new SortField("abstract", SortField.SCORE, true),
SortField.FIELD_DOC, new SortField("content", SortField.DOC, true),
});
TopDocs docs = search.Search(bQuery, (Filter)null, maxNum, sort);
if (docs != null)
{
var count = docs.TotalHits > maxNum ? maxNum : docs.TotalHits;
for (int i = 0; i < count; i++)
{
Document doc = search.Doc(docs.ScoreDocs[i].Doc);
LiteNewsModel model = new LiteNewsModel()
{
Title = doc.Get("title").ToString(),
Abstract = doc.Get("abstract").ToString(),
BillCode = doc.Get("billCode").ToString(),
Url = doc.Get("url").ToString(),
Content = doc.Get("content").ToString(),
Time = Convert.ToDateTime(doc.Get("addtime")),
};
list.Add(SetHighlighter(dicKeywords, model));
}
}
return(list);
}
public void AddSingleIndex(LiteNewsModel model)
{
IndexWriter writer = new IndexWriter(Direcotry, PanGuAnalyzer, false, IndexWriter.MaxFieldLength.LIMITED);
AddIndex(writer, model);
//释放资源
writer.Optimize();
writer.Dispose();
}
public LiteNewsModel GetModel(string billCode)
{
var model = new LiteNewsModel()
{
BillCode = "T20181102221",
Abstract = "描述测试测试",
Content = "测试测试测试测试信息111内容",
Time = DateTime.Now,
Title = "测试数据第一条20122228",
Url = "https://www.test.com/test.html"
};
return(model);
}
/// <summary>
/// 创建索引
/// </summary>
/// <param name="analyzer"></param>
/// <param name="title"></param>
/// <param name="content"></param>
internal static void AddIndex(IndexWriter writer, LiteNewsModel model)
{
try
{
Document doc = new Document();
//只有对需要全文检索的字段才ANALYZED
doc.Add(new Field("billCode", model.BillCode, Field.Store.YES, Field.Index.NOT_ANALYZED));
doc.Add(new Field("title", model.Title, Field.Store.YES, Field.Index.ANALYZED, Field.TermVector.WITH_POSITIONS_OFFSETS));
doc.Add(new Field("abstract", model.Abstract, Field.Store.YES, Field.Index.ANALYZED, Field.TermVector.WITH_POSITIONS_OFFSETS));
doc.Add(new Field("content", model.Content, Field.Store.YES, Field.Index.ANALYZED, Field.TermVector.WITH_POSITIONS_OFFSETS));
doc.Add(new Field("url", model.Url, Field.Store.YES, Field.Index.NOT_ANALYZED));
doc.Add(new Field("time", model.Time.ToString(), Field.Store.YES, Field.Index.NOT_ANALYZED));
writer.AddDocument(doc);
}
catch (FileNotFoundException fnfe)
{
throw fnfe;
}
catch (Exception ex)
{
throw ex;
}
}
/// <summary>
/// 设置关键字高亮
/// </summary>
/// <param name="dicKeywords">关键字列表</param>
/// <param name="model">返回的数据模型</param>
/// <returns></returns>
private LiteNewsModel SetHighlighter(Dictionary <string, string> dicKeywords, LiteNewsModel model)
{
//return model;
SimpleHTMLFormatter simpleHTMLFormatter = new PanGu.HighLight.SimpleHTMLFormatter("<font color=\"red\">", "</font>");
Highlighter highlighter = new PanGu.HighLight.Highlighter(simpleHTMLFormatter, new Segment())
{
FragmentSize = 50
};
string strTitle = string.Empty;
string strAbstract = string.Empty;
dicKeywords.TryGetValue("title", out strTitle);
dicKeywords.TryGetValue("abstract", out strAbstract);
try
{
if (!string.IsNullOrEmpty(strTitle))
{
var transStr = highlighter.GetBestFragment(strTitle, model.Title);
model.Title = string.IsNullOrEmpty(transStr) ? model.Title : transStr;
}
if (!string.IsNullOrEmpty(strAbstract))
{
var transStr = highlighter.GetBestFragment(strAbstract, model.Abstract);
model.Abstract = string.IsNullOrEmpty(transStr) ? model.Abstract : transStr;
}
}
catch
{
return(model);
}
return(model);
}