Facets with Lucene Posted on August 1, 2014 by Pascal Dimassimo in Latest Articles During the development of our latest product, Norconex Content Analytics, we decided to add facets to the search interface. They allow for exploring the indexed conten…

I  found in lucene 3.5 contrib folder two plugins: one is grouping, the other is facet. In my option, both of them were used to split my documents into different categories. Why lucene has now two plugins for this? They are two different lucene featu…

1.facet的直观认识 facet:面.切面.方面.个人理解就是维度,在满足query的前提下,观察结果在各维度上的分布(一个维度下各子类的数目). 如jd上搜“手机”,得到4009个商品.其中品牌.网络.价格就是商品的维度(facet),点击某个品牌或者网络,获取更细分的结果. 点击品牌小米,获得小米手机的结果,显示27个. 点击移动4G,获得移动4G.小米手机,显示4个. 2.facet特性 facet counting:返回一个facet下某子类的结果数.如上面的品牌维度下小米子类中满足…

package com.fox.facet; /* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF lice…

package com.fox.facet; import java.io.IOException; import java.util.ArrayList; import java.util.List; import org.apache.lucene.analysis.core.WhitespaceAnalyzer; import org.apache.lucene.document.Document; import org.apache.lucene.facet.index.FacetFie…

package com.fox.facet; import java.io.File; import java.io.IOException; import java.util.ArrayList; import java.util.Arrays; import java.util.List; import org.apache.lucene.analysis.Analyzer; import org.apache.lucene.analysis.standard.StandardAnalyze…

http://stackoverflow.com/questions/185697/the-most-efficient-way-to-find-top-k-frequent-words-in-a-big-word-sequence http://www.geeksforgeeks.org/find-the-k-most-frequent-words-from-a-file/ http://cs.stackexchange.com/questions/26427/word-frequency-w…

转自:http://www.lai18.com/content/7084969.html Facet说明 我们在浏览网站的时候,经常会遇到按某一类条件查询的情况,这种情况尤以电商网站最多,以天猫商城为例,我们选择某一个品牌,系统会将该品牌对应的商品展示出来,效果图如下: 如上图,我们关注的是品牌,选购热点等方面,对于类似的功能我们用lucene的term查询当然可以,但是在数据量特别大的情况下还用普通查询来实现显然会因为FSDirectory.open等耗时的操作造成查询效率的低下,同时普通查询…

假如你像用lucene来作分组,比如按类别分组,这种功能,好了你压力大了,lucene本身是不支持分组的. 当你想要这个功能的时候,就可能会用到基于lucene的搜索引擎solr. 不过也可以通过编码通过FieldCache和单字段,对索引进行分组,比如:想构造类别树.大类里面还有小类那种. 这个功能实现起来可能会比较麻烦,主要是lucene提供的支持也不多,参考资料也不多. (以下代码都是我在做测试的时候做的,可以稍作修改满足相应需求.) //用于分组统计的对象GroupCollector i…

简单的facet实例 public class SimpleFacetsExample { private final Directory indexDir = new RAMDirectory(); private final Directory taxoDir = new RAMDirectory(); private final FacetsConfig config = new FacetsConfig(); /** Empty constructor */ public SimpleF…