elasticsearch 分页+高亮处理

梦里梦外; 2023-10-03 14:34 23阅读 0赞

既然你点到这里了,那你也有一定es的基础了,关于es的配置和依赖我也不多说了,直接上代码

## controller层 ##

@GetMapping("eskeyword")
    public R  mohu(@RequestParam(value = "ename",defaultValue = "")String ename
            ,@RequestParam(value = "page",defaultValue = "1")int page
            ,@RequestParam(value = "size",defaultValue = "3")int size) throws IOException {
        
        //这个pageutils是我自动生成的你们另选其他
        PageUtils mohues = stuService.mohues(ename, page, size);
        return R.ok().put("page",mohues);
    }

## serviceimp ##

@Override
        public PageUtils  mohues(String ename, int page, int size) throws IOException {
        
            SearchRequest searchRequest = new SearchRequest("week2");
            SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
            System.out.println(ename);
            //判断是否存在
            if (ename.equals("")){
        
                //不存在查全部
                searchSourceBuilder.query(QueryBuilders.matchAllQuery());
            }else {
        
                //存在查条件                                                                             //多条件用,分隔
                MultiMatchQueryBuilder queryBuilder = QueryBuilders.multiMatchQuery(ename, "ename", "sex");
                searchSourceBuilder.query(queryBuilder);
            }
            //分页
            searchSourceBuilder.from((page-1)*size);
            searchSourceBuilder.size(size);
        //高亮
            if (!ename.equals("")){
        
                HighlightBuilder highlightBuilder = new HighlightBuilder();
                highlightBuilder.field("ename").field("sex");
                highlightBuilder.preTags("<span style='color:red'>");
                highlightBuilder.postTags("</span>");
                searchSourceBuilder.highlighter(highlightBuilder);
            }
            //sex
         searchRequest.source(searchSourceBuilder);
            //执行
            SearchResponse search = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
            //处理结果
            SearchHits hits = search.getHits();
            TotalHits totalHits = hits.getTotalHits();
            //所有数量
         long aa=  totalHits.value;
            SearchHit[] hits1 = hits.getHits();
            ArrayList<StuEntity> arr = new ArrayList<>();
            for (SearchHit hit : hits1) {
        
                String index = hit.getIndex();
                String id = hit.getId();
                float score = hit.getScore();
                //拿到json字符串
                String string = hit.getSourceAsString();
                //json转对象
                StuEntity stuEntity = JSON.parseObject(string, StuEntity.class);
                    stuEntity.setEid(Integer.valueOf(id));
                    if(ename.equals("")){
        
    
                    }else {
        
                      //处理高亮====================================
                        Map<String, HighlightField> highlightFields = hit.getHighlightFields();
                        //获取ename的值
                        HighlightField highlight = highlightFields.get("ename");
                        if (highlight!=null){
        
                            //官方粘的,别问我什么意思
                            Text[] fragments = highlight.fragments();
                            String fragmentString = fragments[0].string();
                            stuEntity.setEname(fragmentString);
                        }
                        HighlightField sexhighlight = highlightFields.get("sex");
                        if (sexhighlight!=null){
        
                            //和上同理sexhighlight是上面返回的值
                            Text[] fragments = sexhighlight.fragments();
                            String fragmentString = fragments[0].string();
                            stuEntity.setSex(fragmentString);
                        }
                    }
            arr.add(stuEntity);
            }
            //分页
            PageUtils stuEntityPageUtil = new PageUtils(arr, Math.toIntExact(aa),size,page);
            return stuEntityPageUtil;
        }

外加SQL写法

GET week2/_search
       {
        
         "query": {
        
           "multi_match": {
        
             "query": "张",
             "fields": ["ename","sex"]
           }
         },
         "highlight": {
        
           "fields": {
        "ename":{
        }},
           "pre_tags": "<span style='color:red'>",
           "post_tags": "</span>"
         }
       }

另外小提示  
前台es想要 高亮必须加  
![在这里插入图片描述][8601198013544d0a8dad98af048576f4.png_pic_center]

想要详细查看官网  
[https://www.elastic.co/guide/en/elasticsearch/client/java-rest/7.x/java-rest-high-search.html][https_www.elastic.co_guide_en_elasticsearch_client_java-rest_7.x_java-rest-high-search.html]

[8601198013544d0a8dad98af048576f4.png_pic_center]: https://img-blog.csdnimg.cn/8601198013544d0a8dad98af048576f4.png#pic_center
[https_www.elastic.co_guide_en_elasticsearch_client_java-rest_7.x_java-rest-high-search.html]: https://www.elastic.co/guide/en/elasticsearch/client/java-rest/7.x/java-rest-high-search.html