通过URL搜索Lucene [英] Lucene search by URL

问题描述

我存储一个包含URL字段的文档：

  Document doc = new Document（）; 
 doc.add（new Field（url，url，Field.Store.YES，Field.Index.NOT_ANALYZED））; 
 doc.add（new Field（text，text，Field.Store.YES，Field.Index.ANALYZED））; 
 doc.add（new Field（html，CompressionTools.compressString（html），Field.Store.YES））; 
  

我希望能够通过其URL找到文档，但我得到0个结果：

 分析器分析器=新的StandardAnalyzer（版本.LUCENE_30）
查询查询=新的QueryParser（LUCENE_VERSION，url，分析仪）.parse（URL）; 
 IndexSearcher搜索器=新的IndexSearcher（index，true）; 
 TopScoreDocCollector collector = TopScoreDocCollector.create（10，true）; 
 searcher.search（query，collector）; 
 ScoreDoc [] hits = collector.topDocs（）。scoreDocs; 
 //显示结果
（ScoreDoc hit：hits）{
 System.out.println（FOUND A MATCH）; 
} 
 searcher.close（）; 
  

我可以做些什么不同的事情，以便我可以存储HTML文档并通过它的URL找到它？

解决方案

您可能会将您的查询重写为这样的内容

  Query query = new QueryParser（LUCENE_VERSION，url，analyzer）.newTermQuery（new Term（url，url））。parse（url）; 
  

建议：

  TermQuery tq = new TermQuery（new）
我建议您使用BooleanQuery，因为它提供了良好的性能，并且在内部对其进行了优化。术语（url，url））; 
 // BooleanClauses枚举应该说这个运算符用于应该出现在匹配文档中的子句。 
 BooleanQuery bq = new BooleanQuery（）。add（tq，BooleanClause.Occur.SHOULD）; 
 IndexSearcher搜索器=新的IndexSearcher（index，true）; 
 TopScoreDocCollector collector = TopScoreDocCollector.create（10，true）; 
 searcher.search（query，collector）; 
  

我看到您使用URL frield作为Not_Analysed进行索引，这对于搜索来说是很好的IMO，因为没有分析器现在如果您的商业案例说，我会给你一个网址找到精确。

一个来自Lucene索引，那么你应该看看你的索引与一个不同的分析器（KeywordAnalyzer等）

I'm storing a Document which has a URL field:

Document doc = new Document();
doc.add(new Field("url", url, Field.Store.YES, Field.Index.NOT_ANALYZED));
doc.add(new Field("text", text, Field.Store.YES, Field.Index.ANALYZED));
doc.add(new Field("html", CompressionTools.compressString(html), Field.Store.YES));

I'd like to be able to find a Document by its URL, but I get 0 results:

Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_30)
Query query = new QueryParser(LUCENE_VERSION, "url", analyzer).parse(url);
IndexSearcher searcher = new IndexSearcher(index, true);
TopScoreDocCollector collector = TopScoreDocCollector.create(10, true);
searcher.search(query, collector);
ScoreDoc[] hits = collector.topDocs().scoreDocs;
// Display results
for (ScoreDoc hit : hits) {
  System.out.println("FOUND A MATCH");
}
searcher.close();

What can I do differently so that I can store an HTML document and find it by its URL?

解决方案

You may rewrite your query to something like this

Query query = new QueryParser(LUCENE_VERSION, "url", analyzer).newTermQuery(new Term("url", url)).parse(url);

Suggestion:

I suggest you use BooleanQuery since it gives good performance and internally it is optimized.

TermQuery tq= new TermQuery(new Term("url", url));
// BooleanClauses Enum SHOULD says Use this operator for clauses that should appear in the matching documents.
BooleanQuery bq = new BooleanQuery().add(tq,BooleanClause.Occur.SHOULD);
IndexSearcher searcher = new IndexSearcher(index, true);
TopScoreDocCollector collector = TopScoreDocCollector.create(10, true);
searcher.search(query, collector);

I see you are indexing using URL frield as Not_Analysed, which is good IMO for searching, As no analyzer is used the value will be stored as a single term.

Now if your business case says, i will give you a URL find the EXACT one from the Lucene Index then you shall look at your indexing with a different analyzer(KeywordAnalyzer etc)

这篇关于通过URL搜索Lucene的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！