(SpringBoot集成ES高級查詢)spring-boot-starter-data-elasticsearch API

SpringBoot集成ElasticSearch

<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
</dependency>

參考這篇文章

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<>();

//構建查詢
if (searchMap != null) {
    //構建查詢條件封裝對象
    NativeSearchQueryBuilder nativeSearchQueryBuilder = new NativeSearchQueryBuilder();
    BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();

    //按照關鍵字查詢
    if (StringUtils.isNotEmpty(searchMap.get("keywords"))) {
        boolQuery.must(QueryBuilders.matchQuery("name", searchMap.get("keywords")).operator(Operator.AND));
    }

    //按照品牌進行過濾查詢
    if (StringUtils.isNotEmpty(searchMap.get("brand"))) {
        boolQuery.filter(QueryBuilders.termQuery("brandName", searchMap.get("brand")));
    }

    //按照規格進行過濾查詢
    for (String key : searchMap.keySet()) {
        if (key.startsWith("spec_")) {
            String value = searchMap.get(key).replace("%2B", "+");
            //spec_網絡制式
            boolQuery.filter(QueryBuilders.termQuery(("specMap." + key.substring(5) + ".keyword"), value));
        }
    }

    //按照價格進行區間過濾查詢
    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);

    //按照品牌進行分組(聚合)查詢
    String skuBrand = "skuBrand";
    nativeSearchQueryBuilder.addAggregation(AggregationBuilders.terms(skuBrand).field("brandName"));

    //按照規格進行聚合查詢
    String skuSpec = "skuSpec";
    nativeSearchQueryBuilder.addAggregation(AggregationBuilders.terms(skuSpec).field("spec.keyword"));

    //開啓分頁查詢
    String pageNum = searchMap.get("pageNum"); //當前頁
    String pageSize = searchMap.get("pageSize"); //每頁顯示多少條
    if (StringUtils.isEmpty(pageNum)) {
        pageNum = "1";
    }
    if (StringUtils.isEmpty(pageSize)) {
        pageSize = "20";
    }

    //設置分頁
    //第一個參數:當前頁 是從0開始
    //第二個參數:每頁顯示多少條
    nativeSearchQueryBuilder.withPageable(PageRequest.of(Integer.parseInt(pageNum) - 1, Integer.parseInt(pageSize)));

    //按照相關字段進行排序查詢
    // 1.當前域 2.當前的排序操作(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));
        }
    }

    //設置高亮域以及高亮的樣式
    HighlightBuilder.Field field = new HighlightBuilder.Field("name")//高亮域
            .preTags("<span style='color:red'>")//高亮樣式的前綴
            .postTags("</span>");//高亮樣式的後綴
    nativeSearchQueryBuilder.withHighlightFields(field);

    //開啓查詢
    /**
     * 第一個參數: 條件構建對象
     * 第二個參數: 查詢操作實體類
     * 第三個參數: 查詢結果操作對象
     */
    //封裝查詢結果
    AggregatedPage<SkuInfo> resultInfo = elasticsearchTemplate.queryForPage(nativeSearchQueryBuilder.build(), SkuInfo.class, new SearchResultMapper() {
        @Override
        public <T> AggregatedPage<T> mapResults(SearchResponse searchResponse, Class<T> aClass, Pageable pageable) {
            //查詢結果操作
            List<T> list = new ArrayList<>();

            //獲取查詢命中結果數據
            SearchHits hits = searchResponse.getHits();
            if (hits != null) {
                //有查詢結果
                for (SearchHit hit : hits) {
                    //SearchHit轉換爲skuinfo
                    SkuInfo skuInfo = JSON.parseObject(hit.getSourceAsString(), SkuInfo.class);

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

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

    //封裝最終的返回結果
    //總記錄數
    resultMap.put("total", resultInfo.getTotalElements());
    //總頁數
    resultMap.put("totalPages", resultInfo.getTotalPages());
    //數據集合
    resultMap.put("rows", resultInfo.getContent());

    //封裝品牌的分組結果
    StringTerms brandTerms = (StringTerms) resultInfo.getAggregation(skuBrand);
    List<String> brandList = brandTerms.getBuckets().stream().map(bucket -> bucket.getKeyAsString()).collect(Collectors.toList());
    resultMap.put("brandList", brandList);

    //封裝規格分組結果
    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));

    //當前頁
    resultMap.put("pageNum", pageNum);
    return resultMap;
}
return null;
}


    /**
     * 原有數據
     *  [
     *         "{'顏色': '黑色', '尺碼': '平光防藍光-無度數電腦手機護目鏡'}",
     *         "{'顏色': '紅色', '尺碼': '150度'}",
     *         "{'顏色': '黑色', '尺碼': '150度'}",
     *         "{'顏色': '黑色'}",
     *         "{'顏色': '紅色', '尺碼': '100度'}",
     *         "{'顏色': '紅色', '尺碼': '250度'}",
     *         "{'顏色': '紅色', '尺碼': '350度'}",
     *         "{'顏色': '黑色', '尺碼': '200度'}",
     *         "{'顏色': '黑色', '尺碼': '250度'}"
     *     ]
     *
     *    需要的數據格式
     *    {
     *        顏色:[黑色,紅色],
     *        尺碼:[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) {
                //將json數據轉換爲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>();
                    }
                    //將規格的值放入set中
                    specSet.add(specMap.get(specKey));
                    //將set放入map中
                    resultMap.put(specKey,specSet);
                }
            }
        }
        return resultMap;
    }



}