微服务框架 SpringCloud微服务架构 26 数据聚合 26.5 多条件聚合

微服务框架

【SpringCloud+RabbitMQ+Docker+Redis+搜索+分布式，系统详解springcloud微服务技术栈课程|黑马程序员Java微服务】

SpringCloud微服务架构

文章目录

微服务框架
SpringCloud微服务架构
26 数据聚合
- 26.5 多条件聚合
- - 26.5.1 直接开干

26 数据聚合

26.5 多条件聚合

26.5.1 直接开干

案例：在IUserService中定义方法，实现对品牌、城市、星级的聚合

需求：搜索页面的品牌、城市等信息不应该是在页面写死，而是通过聚合索引库中的酒店数据得来的：

在IUserService中定义一个方法，实现对品牌、城市、星级的聚合，方法声明如下：

直接开干

package cn.itcast.hotel.service;import cn.itcast.hotel.pojo.Hotel;
import cn.itcast.hotel.pojo.PageResult;
import cn.itcast.hotel.pojo.RequestParams;
import com.baomidou.mybatisplus.extension.service.IService;import java.util.List;
import java.util.Map;public interface IHotelService extends IService<Hotel> {PageResult search(RequestParams params);Map<String , List<String>> filters();
}

修改实现类，实现这个接口

package cn.itcast.hotel.service.impl;import cn.itcast.hotel.mapper.HotelMapper;
import cn.itcast.hotel.pojo.Hotel;
import cn.itcast.hotel.pojo.HotelDoc;
import cn.itcast.hotel.pojo.PageResult;
import cn.itcast.hotel.pojo.RequestParams;
import cn.itcast.hotel.service.IHotelService;
import com.alibaba.fastjson.JSON;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
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.geo.GeoPoint;
import org.elasticsearch.common.unit.DistanceUnit;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.QueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.functionscore.FunctionScoreQueryBuilder;
import org.elasticsearch.index.query.functionscore.ScoreFunctionBuilder;
import org.elasticsearch.index.query.functionscore.ScoreFunctionBuilders;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.Aggregations;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortBuilder;
import org.elasticsearch.search.sort.SortBuilders;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.CollectionUtils;import javax.crypto.spec.OAEPParameterSpec;
import javax.crypto.spec.PBEParameterSpec;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;@Service
public class HotelService extends ServiceImpl<HotelMapper, Hotel> implements IHotelService {@Autowiredprivate RestHighLevelClient client;@Overridepublic PageResult search(RequestParams params) {try {//1. 准备RequestSearchRequest request = new SearchRequest("hotel");//2. 准备DSL//2.1 关键字搜索querybuildBasicQuery(params, request);//2.2 分页Integer page = params.getPage();Integer size = params.getSize();request.source().from((page - 1) * size).size(size);//2.3 排序//2.3.1 地理位置排序String location = params.getLocation();System.out.println(location);if (location != null && !location.equals("")) {request.source().sort(SortBuilders.geoDistanceSort("location", new GeoPoint(location)).order(SortOrder.ASC).unit(DistanceUnit.KILOMETERS));}//2.3.2 sortBy排序String sortBy = params.getSortBy();System.out.println(sortBy);if (sortBy != null && !sortBy.equals("")){if (sortBy.equals("default")){;}if(sortBy.equals("score")){request.source().sort("score",SortOrder.DESC);}if (sortBy.equals("price")){request.source().sort("price",SortOrder.ASC);}}//3. 发送请求SearchResponse response = client.search(request, RequestOptions.DEFAULT);//4. 解析响应return handleResponse(response);} catch (IOException e) {throw new RuntimeException(e);}}@Overridepublic Map<String, List<String>> filters() {try {//1. 准备RequestSearchRequest request = new SearchRequest("hotel");//2. 准备DSL//2.1 设置sizerequest.source().size(0);//2.2 聚合buildAggregation(request);//3. 发出请求SearchResponse response = client.search(request, RequestOptions.DEFAULT);//4. 解析结果Map<String , List<String >> result = new HashMap<>();Aggregations aggregations = response.getAggregations();//4.1 根据品牌名称，获取品牌结果List<String> brandList = getAggByName(aggregations,"brandAgg");result.put("品牌",brandList);//4.2 根据城市，获取城市结果List<String> cityList = getAggByName(aggregations,"cityAgg");result.put("城市",cityList);//4.3 根据星级，获取星级结果List<String> starList = getAggByName(aggregations,"starAgg");result.put("星级",starList);return result;}catch (IOException e){throw new RuntimeException(e);}}private static List<String> getAggByName(Aggregations aggregations,String aggName) {//4.1 根据聚合名称，获取聚合结果Terms brandTerms = aggregations.get(aggName);//4.2 获取bucketsList<? extends Terms.Bucket> buckets = brandTerms.getBuckets();//4.3 遍历List<String> brandList = new ArrayList<>();for (Terms.Bucket bucket : buckets) {//4.4 获取keyString key = bucket.getKeyAsString();brandList.add(key);}return brandList;}private static void buildAggregation(SearchRequest request) {request.source().aggregation(AggregationBuilders.terms("brandAgg").field("brand").size(100));request.source().aggregation(AggregationBuilders.terms("cityAgg").field("city").size(100));request.source().aggregation(AggregationBuilders.terms("starAgg").field("starName").size(100));}private static void buildBasicQuery(RequestParams params, SearchRequest request) {//1. 构建BooleanQueryBoolQueryBuilder boolQuery = QueryBuilders.boolQuery();//关键字搜索String key = params.getKey();//健壮判断if (key == null || "".equals(key)) {boolQuery.must(QueryBuilders.matchAllQuery());} else {boolQuery.must(QueryBuilders.matchQuery("all", key));//3. 高亮控制request.source().highlighter(new HighlightBuilder().field("name").requireFieldMatch(false));}//条件过滤//【城市】if (params.getCity() != null && !params.getCity().equals("")) {boolQuery.filter(QueryBuilders.termQuery("city", params.getCity()));}//【品牌】if (params.getBrand() != null && !params.getBrand().equals("")) {boolQuery.filter(QueryBuilders.termQuery("brand", params.getBrand()));}//【星级】if (params.getStarName() != null && !params.getStarName().equals("")) {boolQuery.filter(QueryBuilders.termQuery("starName", params.getStarName()));}//【价格】if (params.getMinPrice() != null && params.getMaxPrice() != null) {boolQuery.filter(QueryBuilders.rangeQuery("price").gte(params.getMinPrice()).lte(params.getMaxPrice()));}//2. 算分控制FunctionScoreQueryBuilder functionScoreQuery =QueryBuilders.functionScoreQuery(// 原始查询，相关性算分的查询boolQuery,//function score 的数组new FunctionScoreQueryBuilder.FilterFunctionBuilder[]{//其中的一个function score 元素new FunctionScoreQueryBuilder.FilterFunctionBuilder(//过滤条件QueryBuilders.termQuery("isAD", true),//算分函数ScoreFunctionBuilders.weightFactorFunction(10))});request.source().query(functionScoreQuery);}private PageResult handleResponse(SearchResponse response) {//4. 解析响应SearchHits searchHits = response.getHits();//4.1 获取总条数long total = searchHits.getTotalHits().value;System.out.println("共搜索到" + total + "条数据");//4.2 文档数组SearchHit[] hits = searchHits.getHits();System.out.println("====================>文档数组");System.out.println(hits);//4.3 遍历List<HotelDoc> hotels = new ArrayList<>();for (SearchHit hit : hits) {//获取文档sourceString json = hit.getSourceAsString();//反序列化HotelDoc hotelDoc = JSON.parseObject(json, HotelDoc.class);//获取高亮结果Map<String, HighlightField> highlightFields = hit.getHighlightFields();//健壮判断if (!CollectionUtils.isEmpty(highlightFields)){//根据字段名获取高亮结果HighlightField highlightField = highlightFields.get("name");//健壮判断if (highlightField != null) {//获取高亮值String name = highlightField.getFragments()[0].string();//覆盖非高亮结果hotelDoc.setName(name);}}//获取排序值Object[] sortValues = hit.getSortValues();if (sortValues.length > 0) {Object sortValue = sortValues[0];hotelDoc.setDistance(sortValue);}System.out.println(hotelDoc);hotels.add(hotelDoc);}//4.4 封装返回return new PageResult(total, hotels);}
}

OK，测试一下

package cn.itcast.hotel;import cn.itcast.hotel.service.IHotelService;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;import java.util.List;
import java.util.Map;@SpringBootTest
class HotelDemoApplicationTests {@Autowiredprivate IHotelService hotelService;@Testvoid contextLoads() {Map<String, List<String>> filters = hotelService.filters();System.out.println(filters);}}

直接运行

没毛病

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