java – Lucene按URL搜索

我正在存储一个包含URL字段的Document:

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找到一个Document,但我得到0结果:

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();

我可以做些什么,以便我可以存储HTML文档并通过其URL找到它?

解决方法:

您可以将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:

我建议你使用BooleanQuery,因为它提供了良好的性能,并在内部进行了优化.

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);

我看到你使用URL frield作为Not_Analysed索引,这是一个很好的搜索IMO,因为没有使用分析器,所以该值将被存储为单个术语.

现在,如果你的商业案例说明,我会给你一个URL找到Lucene索引中的EXACT,然后用不同的分析器(KeywordAnalyzer等)查看你的索引.

上一篇:Java,Lucene:在Java中为IndexWriter设置锁定超时.


下一篇:经常更新索引的FieldCache