Elasticsearch：附近的店铺距离排序

落日映苍穹つ 2024-03-24 10:31 54阅读 0赞

import org.apache.http.HttpHost;
    import org.elasticsearch.client.RestClient;
    import org.elasticsearch.client.RestHighLevelClient;
     
    @Configuration
    public class ElasticsearchConfig {
     
     
        @Bean
        public RestHighLevelClient restHighLevelClient(){
            return new RestHighLevelClient(RestClient.builder(
                    HttpHost.create("http://192.168.150.101:9200")
            ));
        }
    }

@Data
    public class Demo{
    
        // 用于附近店铺，得到排序信息
        private Object distance;
    }

@Data
    public class RequestParams {
    
        private Integer page;
        private Integer size;
        // location的格式为 "经度,纬度“
        private String location;
    
    }

import com.alibaba.fastjson.JSON;
    import lombok.extern.slf4j.Slf4j;
    import org.apache.commons.lang3.StringUtils;
    import org.elasticsearch.action.search.SearchRequest;
    import org.elasticsearch.action.search.SearchResponse;
    import org.elasticsearch.client.RestHighLevelClient;
    import org.elasticsearch.index.query.QueryBuilders;
    import org.elasticsearch.search.SearchHit;
    import org.elasticsearch.search.SearchHits;
    
    @Slf4j
    @Service
    public class DemoService extends ServiceImpl<DemoMapper, Demo> implements IDemoService {
    
        @Autowired
        private RestHighLevelClient restHighLevelClient;
    
        @Override
        public PageResult search(RequestParams params) {
            try {
                
                // 1.准备Request
                SearchRequest request = new SearchRequest("demo");
                // 2.准备请求参数
                // 2.1.分页
                int page = params.getPage();
                int size = params.getSize();
                request.source().from((page - 1) * size).size(size);
    
                // ==============================================================
    
                // 2.2.距离排序
                String location = params.getLocation();
                if (StringUtils.isNotBlank(location)) {
                    request.source().sort(SortBuilders
                                          // "location" es中的参数
                                          .geoDistanceSort("location", new GeoPoint(location))
                                          .order(SortOrder.ASC)
                                          .unit(DistanceUnit.KILOMETERS)
                                         );
                }
    
                // ==============================================================
    
                // 3.发送请求
                SearchResponse response = restHighLevelClient.search(request, RequestOptions.DEFAULT);
                // 4.解析响应
                return handleResponse(response);
            } catch (IOException e) {
                throw new RuntimeException("搜索数据失败", e);
            }
        }
    
    
        private PageResult handleResponse(SearchResponse response) {
            SearchHits searchHits = response.getHits();
            // 4.1.总条数
            long total = searchHits.getTotalHits().value;
            // 4.2.获取文档数组
            SearchHit[] hits = searchHits.getHits();
            // 4.3.遍历
            List<Demo> demoList = new ArrayList<>(hits.length);
            for (SearchHit hit : hits) {
    
                // 4.4.获取source
                String json = hit.getSourceAsString();
                // 4.5.反序列化，非高亮的
                Demo demo= JSON.parseObject(json, Demo.class);
    
                // =======================================================
    
                // 4.6.排序信息
                Object[] sortValues = hit.getSortValues();
                if (sortValues.length > 0) {
                    demo.setDistance(sortValues[0]);
                }
    
                // =======================================================
    
                // 4.7.放入集合
                demoList.add(demo);
            }
            return new PageResult(total, hotels);
        }
    }