参考官网：https://lucene.apache.org/solr/guide/6_6/result-clustering.html
最近用到solr自聚类的，先简单介绍如下：
1、配置文件
主要配置文件必须配置如下内容：
<lib dir="${solr.install.dir:../../..}/contrib/clustering/lib/" regex=".*\.jar" />
<lib dir="${solr.install.dir:../../..}/dist/" regex="solr-clustering-\d.*\.jar" />
<searchComponent name="clustering" enable="${solr.clustering.enabled:true}" class="solr.clustering.ClusteringComponent">
<!-- Lingo clustering algorithm -->
<lst name="engine">
<str name="name">lingo</str>
<!--<bool name="optional">true</bool>-->
<str name="carrot.algorithm">org.carrot2.clustering.lingo.LingoClusteringAlgorithm</str>
<str name="carrot.resourcesDir">clustering/carrot2</str>
</lst>
<!-- An example definition for the STC clustering algorithm. -->
<lst name="engine">
<str name="name">stc</str>
<bool name="optional">true</bool>
<str name="carrot.algorithm">org.carrot2.clustering.stc.STCClusteringAlgorithm</str>
<str name="carrot.resourcesDir">clustering/carrot2</str>
</lst>
<lst name="engine">
<str name="name">kmeans</str>
<!--<bool name="optional">true</bool>-->
<str name="carrot.algorithm">org.carrot2.clustering.kmeans.BisectingKMeansClusteringAlgorithm</str>
<str name="carrot.resourcesDir">clustering/carrot2</str>
</lst>
</searchComponent>
下面的配置文件根据自己的实际情况进行修改：
<requestHandler name="/clustering"
startup="lazy"
class="solr.SearchHandler">
<lst name="defaults">
<bool name="clustering">true</bool>
<bool name="clustering.results">true</bool> <!-- Field name with the logical "title" of a each document (optional) -->
<str name="carrot.title">keyword</str>
<!-- Logical field to physical field mapping. -->
<str name="carrot.url">id</str>
<!-- Field name with the logical "content" of a each document (optional) -->
<str name="carrot.snippet">summary</str>
<!-- Apply highlighter to the title/ content and use this for clustering. -->
<bool name="carrot.produceSummary">true</bool>
<!-- the maximum number of labels per cluster -->
<!--<int name="carrot.numDescriptions">5</int>-->
<!-- produce sub clusters -->
<bool name="carrot.outputSubClusters">false</bool> <!-- Configure any other request handler parameters. We will cluster the
top 100 search results so bump up the 'rows' parameter. -->
<!--<str name="defType">edismax</str>
<str name="qf">
text^0.5 features^1.0 name^1.2 sku^1.5 id^10.0 manu^1.1 cat^1.4
</str>
<str name="q.alt">*:*</str>-->
<str name="defType">edismax</str>
<!--<str name="qf">
summary^0.5 category^1.2 id^10.0
</str>-->
<str name="qf">keyword^0.5 title^1.2 id^10.0</str>
<str name="rows">100</str>
<str name="fl">*,score</str>
</lst> <!-- Append clustering at the end of the list of search components. -->
<arr name="last-components">
<str>clustering</str>
</arr>
</requestHandler>
managed-schema配置文件包含以下内：
<fieldType name="text_ik" class="solr.TextField">
<analyzer type="index" class="org.wltea.analyzer.lucene.IKAnalyzer"/>
<analyzer type="query" class="org.wltea.analyzer.lucene.IKAnalyzer"/>
</fieldType>
<field name="id" type="string" multiValued="false" indexed="true" required="true" stored="true"/>
<field name="text" type="text_ik" multiValued="false" indexed="true" stored="true" termVectors ="true"/>
<field name="title" type="text_ik" multiValued="false" indexed="true" stored="true" />
<field name="snippet" type="text_ik" multiValued="false" indexed="true" stored="true" />
<field name="keyword" type="text_ik" multiValued="false" indexed="true" stored="true" />
<field name="category" type="text_ik" multiValued="false" indexed="true" stored="true" />
<field name="summary" type="text_ik" multiValued="false" indexed="true" stored="true"/>
<field name="path" type="string" multiValued="false" indexed="true" stored="true"/>
注意：text_ik对应的分词组件，要引用对应的jar包，具体参见：http://www.cnblogs.com/shaosks/p/8204615.html
2、测试索引的文件
启动solr服务，在浏览器输入：http://localhost:8983/solr/mycore/clustering?q=*:*&rows=10
结果如下：
3、java查询代码
import org.apache.solr.client.solrj.SolrClient;
import org.apache.solr.client.solrj.SolrQuery;
import org.apache.solr.client.solrj.SolrServerException;
import org.apache.solr.client.solrj.impl.HttpSolrClient;
import org.apache.solr.client.solrj.response.Cluster;
import org.apache.solr.client.solrj.response.QueryResponse;
import org.apache.solr.client.solrj.response.ClusteringResponse;
import org.apache.solr.common.SolrDocument; import java.io.IOException;
import java.util.List; /**
* @Author：sks
* @Description：
* @Date：Created in 9:41 2018/1/18
* @Modified by：
**/
public class AutoCluster { private static SolrClient solr; /**
* @Author：sks
* @Description：初始化solr客户端
* @Date：
*/
public static void Init(String urlString){ solr = new HttpSolrClient.Builder(urlString).build();
}
public static void main(String[] args) throws SolrServerException,IOException { String urlString = "http://localhost:8983/solr/mycore";
String path = "D:/work/Solr/ImportData"; Init(urlString);
getAutoClusterInfo();
System.exit(0);
} /**
* @Author：sks
* @Description：获取聚类数据
* @Date：
*/
private static void getAutoClusterInfo() throws SolrServerException,IOException {
//使用这个对象做查询
SolrQuery params = new SolrQuery();
//查询所有数据
params.set("qt", "/clustering");
params.setQuery("*:*");
params.setStart(0);
params.setRows(30); QueryResponse queryResponse = solr.query(params);
ClusteringResponse clr = queryResponse.getClusteringResponse();
List<Cluster> list = clr.getClusters();
//拿到聚类数据集合,返回查询结果 String txt = "";
for(Cluster c :list){
//类别标签
List<String> lblist = c.getLabels();
for(String lb:lblist){
System.out.println(lb);
}
//聚类文档ID
List<String> doclist = c.getDocs();
for(String doc:doclist){
System.out.println(" " + doc);
}
} } }
查询结果如下：
