(SpringBoot集成ES高级查询)spring-boot-starter-data-elasticsearch API

SpringBoot集成ElasticSearch

<dependency>
   <groupId>org.springframework.bootgroupId>
   <artifactId>spring-boot-starter-data-elasticsearchartifactId>
dependency>

参考这篇文章

注意ElasticsearchTemplate 的使用

package com.changgou.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.changgou.search.pojo.SkuInfo;
import com.changgou.search.service.SearchService;
import org.apache.commons.lang.StringUtils;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.Operator;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.Aggregation;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.terms.StringTerms;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortBuilders;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.data.elasticsearch.core.ElasticsearchTemplate;
import org.springframework.data.elasticsearch.core.SearchResultMapper;
import org.springframework.data.elasticsearch.core.aggregation.AggregatedPage;
import org.springframework.data.elasticsearch.core.aggregation.impl.AggregatedPageImpl;
import org.springframework.data.elasticsearch.core.query.NativeSearchQueryBuilder;
import org.springframework.stereotype.Service;

import java.util.*;
import java.util.stream.Collectors;

@Service
public class SearchServiceImpl implements SearchService {

@Autowired
private ElasticsearchTemplate elasticsearchTemplate;

@Override
public Map search(Map<String, String> searchMap) {

Map<String, Object> resultMap = new HashMap<>();

//构建查询
if (searchMap != null) {
    //构建查询条件封装对象
    NativeSearchQueryBuilder nativeSearchQueryBuilder = new NativeSearchQueryBuilder();
    BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();

    //按照关键字查询
    if (StringUtils.isNotEmpty(searchMap.get("keywords"))) {
        boolQuery.must(QueryBuilders.matchQuery("name", searchMap.get("keywords")).operator(Operator.AND));
    }

    //按照品牌进行过滤查询
    if (StringUtils.isNotEmpty(searchMap.get("brand"))) {
        boolQuery.filter(QueryBuilders.termQuery("brandName", searchMap.get("brand")));
    }

    //按照规格进行过滤查询
    for (String key : searchMap.keySet()) {
        if (key.startsWith("spec_")) {
            String value = searchMap.get(key).replace("%2B", "+");
            //spec_网络制式
            boolQuery.filter(QueryBuilders.termQuery(("specMap." + key.substring(5) + ".keyword"), value));
        }
    }

    //按照价格进行区间过滤查询
    if (StringUtils.isNotEmpty(searchMap.get("price"))) {
        String[] prices = searchMap.get("price").split("-");
        // 0-500 500-1000
        if (prices.length == 2) {
            boolQuery.filter(QueryBuilders.rangeQuery("price").lte(prices[1]));
        }
        boolQuery.filter(QueryBuilders.rangeQuery("price").gte(prices[0]));
    }
    nativeSearchQueryBuilder.withQuery(boolQuery);

    //按照品牌进行分组(聚合)查询
    String skuBrand = "skuBrand";
    nativeSearchQueryBuilder.addAggregation(AggregationBuilders.terms(skuBrand).field("brandName"));

    //按照规格进行聚合查询
    String skuSpec = "skuSpec";
    nativeSearchQueryBuilder.addAggregation(AggregationBuilders.terms(skuSpec).field("spec.keyword"));

    //开启分页查询
    String pageNum = searchMap.get("pageNum"); //当前页
    String pageSize = searchMap.get("pageSize"); //每页显示多少条
    if (StringUtils.isEmpty(pageNum)) {
        pageNum = "1";
    }
    if (StringUtils.isEmpty(pageSize)) {
        pageSize = "20";
    }

    //设置分页
    //第一个参数:当前页 是从0开始
    //第二个参数:每页显示多少条
    nativeSearchQueryBuilder.withPageable(PageRequest.of(Integer.parseInt(pageNum) - 1, Integer.parseInt(pageSize)));

    //按照相关字段进行排序查询
    // 1.当前域 2.当前的排序操作(升序ASC,降序DESC)
    if (StringUtils.isNotEmpty(searchMap.get("sortField")) && StringUtils.isNotEmpty(searchMap.get("sortRule"))) {
        if ("ASC".equals(searchMap.get("sortRule"))) {
            //升序
            nativeSearchQueryBuilder.withSort(SortBuilders.fieldSort((searchMap.get("sortField"))).order(SortOrder.ASC));
        } else {
            //降序
            nativeSearchQueryBuilder.withSort(SortBuilders.fieldSort((searchMap.get("sortField"))).order(SortOrder.DESC));
        }
    }

    //设置高亮域以及高亮的样式
    HighlightBuilder.Field field = new HighlightBuilder.Field("name")//高亮域
            .preTags("")//高亮样式的前缀
            .postTags("");//高亮样式的后缀
    nativeSearchQueryBuilder.withHighlightFields(field);

    //开启查询
    /**
     * 第一个参数: 条件构建对象
     * 第二个参数: 查询操作实体类
     * 第三个参数: 查询结果操作对象
     */
    //封装查询结果
    AggregatedPage<SkuInfo> resultInfo = elasticsearchTemplate.queryForPage(nativeSearchQueryBuilder.build(), SkuInfo.class, new SearchResultMapper() {
        @Override
        public <T> AggregatedPage<T> mapResults(SearchResponse searchResponse, Class<T> aClass, Pageable pageable) {
            //查询结果操作
            List<T> list = new ArrayList<>();

            //获取查询命中结果数据
            SearchHits hits = searchResponse.getHits();
            if (hits != null) {
                //有查询结果
                for (SearchHit hit : hits) {
                    //SearchHit转换为skuinfo
                    SkuInfo skuInfo = JSON.parseObject(hit.getSourceAsString(), SkuInfo.class);

                    Map<String, HighlightField> highlightFields = hit.getHighlightFields();
                    if (highlightFields != null && highlightFields.size() > 0) {
                        //替换数据
                        skuInfo.setName(highlightFields.get("name").getFragments()[0].toString());
                    }

                    list.add((T) skuInfo);
                }
            }
            return new AggregatedPageImpl<T>(list, pageable, hits.getTotalHits(), searchResponse.getAggregations());
        }
    });

    //封装最终的返回结果
    //总记录数
    resultMap.put("total", resultInfo.getTotalElements());
    //总页数
    resultMap.put("totalPages", resultInfo.getTotalPages());
    //数据集合
    resultMap.put("rows", resultInfo.getContent());

    //封装品牌的分组结果
    StringTerms brandTerms = (StringTerms) resultInfo.getAggregation(skuBrand);
    List<String> brandList = brandTerms.getBuckets().stream().map(bucket -> bucket.getKeyAsString()).collect(Collectors.toList());
    resultMap.put("brandList", brandList);

    //封装规格分组结果
    StringTerms specTerms = (StringTerms) resultInfo.getAggregation(skuSpec);
    List<String> specList = specTerms.getBuckets().stream().map(bucket -> bucket.getKeyAsString()).collect(Collectors.toList());
    resultMap.put("specList", this.formartSpec(specList));

    //当前页
    resultMap.put("pageNum", pageNum);
    return resultMap;
}
return null;
}


    /**
     * 原有数据
     *  [
     *         "{'颜色': '黑色', '尺码': '平光防蓝光-无度数电脑手机护目镜'}",
     *         "{'颜色': '红色', '尺码': '150度'}",
     *         "{'颜色': '黑色', '尺码': '150度'}",
     *         "{'颜色': '黑色'}",
     *         "{'颜色': '红色', '尺码': '100度'}",
     *         "{'颜色': '红色', '尺码': '250度'}",
     *         "{'颜色': '红色', '尺码': '350度'}",
     *         "{'颜色': '黑色', '尺码': '200度'}",
     *         "{'颜色': '黑色', '尺码': '250度'}"
     *     ]
     *
     *    需要的数据格式
     *    {
     *        颜色:[黑色,红色],
     *        尺码:[100度,150度]
     *    }
     */
    public Map<String,Set<String>> formartSpec(List<String> specList){
        Map<String,Set<String>> resultMap = new HashMap<>();
        if (specList!=null && specList.size()>0){
            for (String specJsonString : specList) {
                //将json数据转换为map
                Map<String,String> specMap = JSON.parseObject(specJsonString, Map.class);
                for (String specKey : specMap.keySet()) {
                    Set<String> specSet = resultMap.get(specKey);
                    if (specSet == null){
                        specSet = new HashSet<String>();
                    }
                    //将规格的值放入set中
                    specSet.add(specMap.get(specKey));
                    //将set放入map中
                    resultMap.put(specKey,specSet);
                }
            }
        }
        return resultMap;
    }



}