ElasticSearch（十三）：Spring Data ElasticSearch 的使用（三）——NativeSearchQuery 高亮查询

在Elasticsearch的实际应用中，经常需要将匹配到的结果字符进行高亮显示，此处采取NativeSearchQuery原生查询的方法，实现查询结果的高亮显示。

/**
     * 高亮查询
     */
    @Test
    public void testNativeSearchQuery(){
        String fild="content";
        NativeSearchQuery nativeSearchQuery=new NativeSearchQueryBuilder()
                .withQuery(QueryBuilders.queryStringQuery("黄").defaultField(fild))
                .withHighlightFields(new HighlightBuilder.Field(fild))
                .build();
        AggregatedPage<Film> list =  elasticsearchTemplate.queryForPage(nativeSearchQuery, Film.class, new SearchResultMapper() {
           @Override
           public <T> AggregatedPage<T> mapResults(SearchResponse response, Class<T> clazz, Pageable pageable) {
               List<Film> films = new ArrayList<>();
               SearchHits hits = response.getHits();
               for (SearchHit hit:hits){
                   if(hits.getHits().length<=0){
                       return null;
                   }
                   Film film=new Film();
                   String hightLightMessage = hit.getHighlightFields().get(fild).fragments()[0].toString();
                   film.setId(Long.parseLong(hit.getId()));
                   film.setTitle(hit.getSource().get("title").toString());
                   film.setContent(hit.getSource().get("content").toString());
                   film.setDirector(hit.getSource().get("director").toString());
                   film.setPrice(hit.getSource().get("price").toString());
                   film.setDate(hit.getSource().get("date").toString());

                   try {
                       String setMethodName = parSetName(fild);
                       Class<? extends Film> filmClass = film.getClass();
                       Method setMethod = filmClass.getMethod(setMethodName,String.class);
                       setMethod.invoke(film,hightLightMessage);
                   }catch (Exception e){
                       e.printStackTrace();
                   }
                   films.add(film);

               }
               if (films.size()>0){
                   return new AggregatedPageImpl<>((List<T>) films);
               }
               return null;
           }
       });
       list.getContent().forEach(film -> System.out.println(film));
    }



    public String parSetName(String fieldName){
        if (null == fieldName || "".equals(fieldName)) {
            return null;
        }
        int startIndex = 0;
        if (fieldName.charAt(0) == '_')
            startIndex = 1;
        return "set" + fieldName.substring(startIndex, startIndex + 1).toUpperCase()
                + fieldName.substring(startIndex + 1);
    }

测试结果：