1、在solrconfig.xml中增加
<queryParser name="imdismax" class="com.szhtp.search.parse.IMDisMaxQParserPlugin" /> <requestHandler name="imdismax" class="solr.SearchHandler"> <lst name="defaults"> <str name="defType">imdismax</str> <!-- 查询关键字和设置权重 --> <str name="qf">keywords^3 question^2 answer^0.4</str> <str name="pf">keywords^3 question^2 answer^0.4</str> <str name="mm">2<-1 5<-2 6<90%</str> <!-- 输出时显示那些字段 --> <str name="fl">id,answer,score</str> <!-- 设置PhraseSlop的坡度 --> <int name="ps">100</int> <str name="hl.fl">answer</str> <!-- 默认查询语句用于容错处理 --> <str name="q.alt">*:*</str> <!-- 每个snippet返回的最大字符数。默认是100.如果为0,那么该字段不会被fragmented且整个字段的值会被返回。大字段时不会这么做。 这里的answer=<str name="hl.fl">answer</str> --> <str name="f.answer.hl.fragsize">50</str> <!-- instructs Solr to return the field itself if no query terms are found --> <!-- 如果没有生成snippet(没有terms 匹配),那么使用另一个字段值作为返回 --> <str name="f.answer.hl.alternateField">answer</str> <!-- 这个是solr制定fragment算法的扩展点。gap是默认值。 regex是另一种选项,这种选项指明highlight的边界由一个正则表达式确定。 这是一种非典型的高级选项。为了知道默认设置和fragmenters (and formatters)是如何配置的, 可以看看solrconfig.xml中的highlight段 --> <str name="f.answer.hl.fragmenter">regex</str> <str name="tie">0.1</str> </lst> </requestHandler>
2、创建类IMDisMaxQParserPlugin.java
public class IMDisMaxQParserPlugin extends QParserPlugin { public static String NAME = "imdismax"; public void init(NamedList args) { } public QParser createParser(String qstr, SolrParams localParams, SolrParams params, SolrQueryRequest req) { return new IMDisMaxQParser(qstr, localParams, params, req); } }
3、创建类IMDisMaxQParser.java 可以在里面增加中文分词
public class IMDisMaxQParser extends DisMaxQParser { public IMDisMaxQParser(String qstr, SolrParams localParams, SolrParams params, SolrQueryRequest req) { super(qstr, localParams, params, req); if (null == this.qstr) { return; } Analyzer analyzer = req.getSchema().getQueryAnalyzer(); if (null == analyzer) { return; } StringBuilder norm = new StringBuilder(); try { //对question分词 TokenStream tokens = analyzer.reusableTokenStream("question", new StringReader(this.qstr)); tokens.reset(); Token token = tokens.next(); while (token != null) { norm.append( new String(token.termBuffer(), 0, token.termLength())) .append(" "); token = tokens.next(); } } catch (Exception ex) { } if (norm.length() > 0) this.qstr = norm.toString(); } }