我在 Eclipse 上使用 Java 和 SolrJ。如何按某个字段上的值对 SolrQuery 的结果进行排序？例如，当我搜索特定作者的前 n 篇文章 ( docType=0 ) 时，我想按journal_facet字段（字符串类型）中值的频率对查询结果进行排序。
如果某个作者 X 写过：
- 2 篇文章 (a0, a1) 在名为 J0 的期刊中
- 在名为 J1 的期刊中发表了 3 篇文章（a2、a3、a4）
- 1 篇文章 (a5) 在名为 J2 的期刊中
订单必须是 a2、a3、a4、a0、a1、a5，我想通过以下方式显示结果
<doc>
<arr name="author">
<str>X</str>
</arr>
<str name="title">a2</str>
<str name="journal">J1</str>
</doc>
<doc>
<arr name="author">
<str>X</str>
</arr>
<str name="title">a3</str>
<str name="journal">J1</str>
</doc>
<doc>
<arr name="author">
<str>X</str>
</arr>
<str name="title">a4</str>
<str name="journal">J1</str>
</doc>
<doc>
<arr name="author">
<str>X</str>
</arr>
<str name="title">a0</str>
<str name="journal">J0</str>
</doc>
<doc>
<arr name="author">
<str>X</str>
</arr>
<str name="title">a1</str>
<str name="journal">J0</str>
</doc>
<doc>
<arr name="author">
<str>X</str>
</arr>
<str name="title">a5</str>
<str name="journal">J2</str>
</doc>
我的查询是
SolrServer solrServer = new HttpSolrServer(urlString);
SolrQuery query = new SolrQuery();
query.set("q", "docType:0);
query.set("fq", "author:X");
query.set("fl", "author, title, journal");
query.setRows(n);
...
QueryResponse response = solrServer.query(query);
SolrDocumentList results = response.getResults();
在我的 Solr schema.xml 中有以下字段和类型
<types>
...
<fieldType name="text_title" class="solr.TextField"
positionIncrementGap="100">
<analyzer type="index">
<tokenizer class="solr.WhitespaceTokenizerFactory" />
<charFilter class="solr.HTMLStripCharFilterFactory" />
<filter class="solr.ASCIIFoldingFilterFactory" />
<filter class="solr.WordDelimiterFilterFactory"
generateWordParts="1" generateNumberParts="1" catenateWords="1"
catenateNumbers="1" catenateAll="1" splitOnCaseChange="1"
stemEnglishPossessive="1" preserveOriginal="1" />
<filter class="solr.LowerCaseFilterFactory" />
<filter class="solr.EdgeNGramFilterFactory" minGramSize="2" maxGramSize="15" side="front"/>
<filter class="solr.KStemFilterFactory" />
<filter class="solr.RemoveDuplicatesTokenFilterFactory" />
</analyzer>
<analyzer type="query">
<tokenizer class="solr.WhitespaceTokenizerFactory" />
<filter class="solr.ASCIIFoldingFilterFactory" />
<filter class="solr.WordDelimiterFilterFactory"
generateWordParts="1" generateNumberParts="1" catenateWords="0"
catenateNumbers="0" catenateAll="0" splitOnCaseChange="1"
stemEnglishPossessive="1" preserveOriginal="1" />
<filter class="solr.LowerCaseFilterFactory" />
<filter class="solr.KStemFilterFactory" />
<filter class="solr.RemoveDuplicatesTokenFilterFactory" />
</analyzer>
</fieldType>
<fieldType name="text_name" class="solr.TextField"
positionIncrementGap="100">
<analyzer type="index">
<tokenizer class="solr.WhitespaceTokenizerFactory" />
<charFilter class="solr.HTMLStripCharFilterFactory" />
<filter class="solr.ASCIIFoldingFilterFactory" />
<filter class="solr.WordDelimiterFilterFactory"
generateWordParts="1" generateNumberParts="1" catenateWords="1"
catenateNumbers="1" catenateAll="1" splitOnCaseChange="1" />
<filter class="solr.LowerCaseFilterFactory" />
<!-- n-grams utile per la ricerca per prefisso" -->
<filter class="solr.EdgeNGramFilterFactory" minGramSize="2" maxGramSize="15" side="front"/>
<!-- <filter class="solr.RemoveDuplicatesTokenFilterFactory"/> -->
</analyzer>
<analyzer type="query">
<tokenizer class="solr.WhitespaceTokenizerFactory" />
<filter class="solr.ASCIIFoldingFilterFactory" />
<filter class="solr.WordDelimiterFilterFactory"
generateWordParts="1" generateNumberParts="1" catenateWords="0"
catenateNumbers="0" catenateAll="0" splitOnCaseChange="1" />
<filter class="solr.LowerCaseFilterFactory" />
<!-- <filter class="solr.RemoveDuplicatesTokenFilterFactory"/> -->
</analyzer>
</fieldType>
</types>
<fields>
<field name="docType" type="tint" indexed="true" stored="true"
multiValued="false" required="true" />
<field name="key" type="string" indexed="true" stored="true"
multiValued="false" required="true" />
<field name="mdate" type="date" indexed="true" stored="true"
multiValued="false" required="true" />
...
<field name="author" type="text_name" indexed="true" stored="true"
multiValued="true" />
...
<field name="journal" type="text_title" indexed="true" stored="true"
multiValued="false" />
<field name="title" type="text_title" indexed="true" stored="true"
multiValued="false" />
...
<field name="journal_facet" type="string" indexed="true" stored="true"
multiValued="false" />
...
<copyField dest="journal_facet" source="journal" />
...
</fields>
非常感谢你的帮助。