Lucene学习总结-扩展查询-优快云博客

本文链接：https://blog.youkuaiyun.com/zhangshuliai/article/details/7964101

本文介绍了使用Lucene进行高级搜索的方法，包括自定义排序、HitCollector的使用、扩展QueryParser的功能、自定义过滤器及利用Payloads提高搜索相关性等。通过具体的代码示例展示了如何实现这些高级功能。

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custom sort method：

Sort sort = new Sort(new SortField("location",
new DistanceComparatorSource(10, 10)));
TopFieldDocs docs = searcher.search(query, null, 3, sort);
FieldDoc fieldDoc = (FieldDoc) docs.scoreDocs[0];
Document document = searcher.doc(fieldDoc.doc);

custom HitCollector：

public void testCollecting() throws Exception {
TermQuery query = new TermQuery(new Term("contents", "junit"));
IndexSearcher searcher = new IndexSearcher(TestUtil.getBookIndexDirectory());
BookLinkCollector collector = new BookLinkCollector(searcher);
searcher.search(query, collector);
Map linkMap = collector.getLinks();
TopDocs hits = searcher.search(query, 10);
TestUtil.dumpHits(searcher, hits);
searcher.close();

Extending QueryParser：getFieldQuery，getFuzzyQuery，getPrefixQuery，getRangeQuery，getBooleanQuery，getWildcardQuery

custom filter：

SpecialsAccessor accessor = new TestSpecialsAccessor(isbns);
Filter filter = new SpecialsFilter(accessor);
WildcardQuery educationBooks = // #2
new WildcardQuery(new Term("category", "*education*")); // #2
FilteredQuery edBooksOnSpecial = // #2
new FilteredQuery(educationBooks, filter); // #2
TermQuery logoBooks = // #3
new TermQuery(new Term("subject", "logo")); // #3
BooleanQuery logoOrEdBooks = new BooleanQuery(); // #4
logoOrEdBooks.add(logoBooks, BooleanClause.Occur.SHOULD); // #4
logoOrEdBooks.add(edBooksOnSpecial, BooleanClause.Occur.SHOULD); // #4
TopDocs hits = searcher.search(logoOrEdBooks, 10);

Payloads：相当于对文档分类，DefaultSimilarity，PayloadHelper,

http://www.cnblogs.com/ibook360/archive/2011/10/27/2217537.html

doc1.add(new Field("category", "foods|0.984 shopping|0.503", Field.Store.YES, Field.Index.ANALYZED));  
String queries = "category:foods content:egg";  
searcher.setSimilarity(new PayloadSimilarity()); 
payloadSearcher.display(payloadSearcher.search(queries), start, end);