关键字高亮查询

朱雀 2021-12-05 05:21 380阅读 0赞

# 1.1.1 需求分析 #

所谓高亮，就是使用特别的样式修饰某字段中包含的搜索关键字。

需求：实现搜索高亮，商品名称使用红色显示搜索关键字。

# 1.1.2实现思路 #

使用默认高亮显示来获取每个搜索命中title字段的高亮显示，在指定title字段的查询请求中包含高亮显示对象。

# 1.1.3 代码实现 #

(1)changgou\_service\_search工程接口 SearchService 新增方法定义

/**
         * 全文检索
         * @param paramMap  查询参数
         * @return
         */
        public Map search(Map<String, String> paramMap) throws Exception;

(2)SearchServiceImpl 实现此方法，实现关键字查询

package com.changgou.service;
    
    
    import org.elasticsearch.action.search.SearchRequest;
    import org.elasticsearch.action.search.SearchResponse;
    import org.elasticsearch.client.RequestOptions;
    import org.elasticsearch.client.RestHighLevelClient;
    import org.elasticsearch.common.text.Text;
    import org.elasticsearch.index.query.BoolQueryBuilder;
    import org.elasticsearch.index.query.MatchQueryBuilder;
    
    import org.elasticsearch.index.query.QueryBuilders;
    import org.elasticsearch.search.SearchHit;
    import org.elasticsearch.search.SearchHits;
    import org.elasticsearch.search.builder.SearchSourceBuilder;
    import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
    import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Service;
    
    import java.util.ArrayList;
    import java.util.HashMap;
    import java.util.List;
    import java.util.Map;
    
    /**
     * @author ：lijunxuan
     * @date ：Created in 2019/7/17  19:00
     * @description ：
     * @version: 1.0
     */
    @Service
    public class SearchServiceImpl implements SearchService {
        @Autowired
        private RestHighLevelClient restHighLevelClient;
        @Override
        public Map search(Map<String, String> paramMap) throws Exception {
            Map<String,Object> resultMap=new HashMap<>();
            /**
             * 1.获取查询参数
             */
            String keywords = paramMap.get("keywords");
            /**
             * 2.获取查询需要的对象
             */
            //创建查询对象，指定索引库名称，_index
            SearchRequest searchRequest = new SearchRequest("sku");
            //指定查询索引库中的类型
            searchRequest.types("doc");
            //创建查询构造对象
            SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
            //创建布尔查询（组合查询对象）
            BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
    
            /**
             * 3.设置根据关键字查询（关键字需要中文分词）
             */
            MatchQueryBuilder nameQueryBuilder = QueryBuilders.matchQuery("name", keywords);
            //根据名称查询条件放入组合查询对象中
            boolQueryBuilder.must(nameQueryBuilder);
            /**
             * 4. 设置高亮查询
             */
            HighlightBuilder highlightBuilder = new HighlightBuilder();
            //设置在哪个域中高亮显示
            highlightBuilder.field("name");
            //设置高亮前缀
            highlightBuilder.preTags("<em style=\"color:red\">");
            //设置高亮后缀
            highlightBuilder.postTags("</em>");
            searchSourceBuilder.highlighter(highlightBuilder);
            /**
             * 12.查询并返回的结果
             */
            //将组合查询条件放入查询构造对象中
            searchSourceBuilder.query(boolQueryBuilder);
            //将组合查询条件放入查询请求中
            searchRequest.source(searchSourceBuilder);
            SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
            /**
             * 13. 获取查询到的结果集, 封装后返回
             */
            SearchHits searchHits = searchResponse.getHits();
            //获取查询到的总条数
            long totalHits = searchHits.getTotalHits();
            resultMap.put("total",totalHits);
            //获取查询结果集
            SearchHit[] hits = searchHits.getHits();
            List rows = new ArrayList<>();
            if (hits!=null){
                for (SearchHit hit : hits) {
                    //获取普通的查询出来的一条数据(不带高亮名称)
                    Map<String, Object> sourceAsMap = hit.getSourceAsMap();
                    //获取高亮结果
                    Map<String, HighlightField> highlightFields = hit.getHighlightFields();
                    if (highlightFields != null) {
                        HighlightField highlightField = highlightFields.get("name");
                        Text[] fragments = highlightField.fragments();
                        if (fragments != null && fragments.length > 0) {
                            //将高亮名称放入查询出来的数据中, 覆盖原来不带高亮的名称
                            sourceAsMap.put("name", fragments[0].toString());
                        }
                }
                    rows.add(sourceAsMap);
                }
        }
            resultMap.put("rows",rows);
            return resultMap;
        }
    }

(3)changgou\_service\_search新增SearchController类

package com.changgou.controller;
    
    import com.changgou.entity.Result;
    import com.changgou.entity.StatusCode;
    import com.changgou.service.EsManagerService;
    
    
    import com.changgou.service.SearchService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestParam;
    import org.springframework.web.bind.annotation.RestController;
    
    import java.util.Map;
    
    /**
     * @author ：lijunxuan
     * @date ：Created in 2019/7/14  21:41
     * @description ：
     * @version: 1.0
     */
    @RestController
    @RequestMapping("/search")
    public class SearchController {
        @Autowired
        private SearchService searchService;
        /**
         * 全文检索
         * @return
         */
        @GetMapping
        public Result search(@RequestParam Map<String, String> paramMap) throws Exception {
            Map resultMap = searchService.search(paramMap);
            return new Result(true, StatusCode.OK, "查询成功", resultMap);
        }
    }

# 1.1.4测试结果 #

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzM5MTc5OTkz_size_16_color_FFFFFF_t_70]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzM5MTc5OTkz_size_16_color_FFFFFF_t_70]: /images/20211205/61d8a2f26ac648a28faf71c6b824fcfe.png