solrj 高亮顯示

版本solr-4.10.1中，不用配置文件設置高亮，而用solrj設置高亮。注意高亮的字段field必須設置storeOffsetsWithPositions="true"，否則高亮異常：field 'dkeys' was indexed without offsets, cannot highlight。

很多老代碼都是這麼寫，結論是：設置的css樣式無效，默認成了<em></em>樣式，高亮效果是字體斜體。

params.add(HighlightParams.FIELDS, hls);
params.set(HighlightParams.HIGHLIGHT, true);
      params.set(HighlightParams.SIMPLE_PRE, "<font color=\'red\'");或者red不用加單引號其實就可以不需要轉義
      params.set(HighlightParams.SIMPLE_POST, "</font>");

查了solrj官方資料這麼寫的：

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.

後來改成這樣的代碼，則設置的高亮效果有效：

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>");

結果顯示代碼：

Map<String,Map<String,List<String>>> hl = response.getHighlighting();
        //循環匹配title領域高亮集合

        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高亮返回爲："  + temp);
                }
            }
}