Elasticsearch：广告置顶

ゝ一纸荒年。 2024-03-24 10:48 102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 {
        
        // ture表示有广告，则进行加分
        private Boolean isAD;
    }

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.算分函数查询
                FunctionScoreQueryBuilder functionScoreQuery = QueryBuilders.functionScoreQuery(
                    boolQuery, // 原始查询，boolQuery
                    new FunctionScoreQueryBuilder.FilterFunctionBuilder[]{ // function数组
                        new FunctionScoreQueryBuilder.FilterFunctionBuilder(
                            QueryBuilders.termQuery("isAD", true), // 过滤条件
                            ScoreFunctionBuilders.weightFactorFunction(10) // 算分函数
                        )
                    }
                );
    
                // 2.3.设置查询条件
                request.source().query(functionScoreQuery);
     
                // 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);
                // 4.9.放入集合
                demoList.add(demo);
            }
            return new PageResult(total, hotels);
        }
    }