solrj 高亮显示

版本solr-4.10.1中，不用配置文件设置高亮，而用solrj设置高亮。注意高亮的字段field必须设置storeOffsetsWithPositions="true"，否则高亮异常：field 'dkeys' was indexed without offsets, cannot highlight。

很多老代码都是这么写，结论是：设置的css样式无效，默认成了<em></em>样式，高亮效果是字体斜体。

 params.add(HighlightParams.FIELDS, hls);
 params.set(HighlightParams.HIGHLIGHT, true);
       params.set(HighlightParams.SIMPLE_PRE, "<font color=\'red\'");或者red不用加单引号其实就可以不需要转义
       params.set(HighlightParams.SIMPLE_POST, "</font>");

查了solrj官方资料这么写的：

 hl.simple.pre/hl.simple.post

 The text which appears before and after a highlighted term when using the simple formatter. This parameter accepts per-field overrides.

 The default values are "<em>" and "</em>" This parameter makes sense for the original Highlighter only. Use hl.tag.pre and hl.tag.post for FastVectorHighlighter (see example under hl.fragmentsBuilder)

This parameter makes sense for the original Highlighter only.

后来改成这样的代码，则设置的高亮效果有效：

 params.add(HighlightParams.FIELDS, hls);
             params.set(HighlightParams.HIGHLIGHT, true);
             params.set(HighlightParams.SNIPPETS, snippets);
             params.set(HighlightParams.TAG_PRE, "<font color=\'red\'>");
             params.set(HighlightParams.TAG_POST, "</font>");

结果显示代码：

 Map<String,Map<String,List<String>>> hl = response.getHighlighting();
         //循环匹配title领域高亮集合

         SolrDocumentList list = response.getResults();
         for(SolrDocument sd : list){
             System.out.println("-------------------------------------------");
             List<String> highightSnippets = hl.get(sd.getFieldValue("id")).get("title");
             if(highightSnippets != null){
             for(int k =0 ; k < highightSnippets.size() ;k++){
                     String temp = highightSnippets.get(k);
                     System.out.println("title高亮返回为："  + temp);
                 }
             }
 }

摘自http://blog.csdn.net/qing419925094/article/details/41348745