思路不清晰的小伙伴可以先在es中把聚合代码写出来

{
  "aggs": {
    "brandAgg": {
      "terms": {
        "field": "brandName.keyword"
      },
      "aggs": {
        "typeAgg": {
        "terms": {
          "field": "typeTwoName.keyword"
        }
        },
        "ruleAgg": {
          "terms": {
            "field": "ruleName.keyword"
          },
            "aggs": {
                "ruleValueAgg": {
                  "terms": {
                    "field": "ruleAttrValue.keyword"
                  }
                }
              }
        }
      }
    }
  }

注:字段名称加keyword是精准查询,模糊查询可以去掉

 查询完成后这是聚合的结构

 pom文件中引入依赖es依赖,在这里就不详细介绍了,首先在java中构建对象

//构建对象
            SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();

 在java代码中先把要聚合的名称创建出来

根据刚刚的es代码设置java中的terms名称和field后面的名称相对应

//构建聚合名称
TermsAggregationBuilder brandAgg = AggregationBuilders.terms("brandAgg").field("brandName.keyword");
TermsAggregationBuilder typeAgg = AggregationBuilders.terms("typeAgg").field("typeTwoName.keyword");
TermsAggregationBuilder ruleAgg = AggregationBuilders.terms("ruleAgg").field("ruleName.keyword");
TermsAggregationBuilder ruleValueAgg = AggregationBuilders.terms("ruleValueAgg").field("ruleAttrValue.keyword");

这里是根据es代码中创建的层级关系来依次分配 

//根据聚合分配层级
brandAgg.subAggregation(typeAgg);
brandAgg.subAggregation(ruleAgg);
ruleAgg.subAggregation(ruleValueAgg);
//添加最外层聚合
searchSourceBuilder.aggregation(brandAgg);

创建实体类来接参

    /*=====================聚合分析=====================*/
    /**
     * 查询到的所有商品所涉及的所有品牌
     */
    private Set<BrandVO> brands = new HashSet<>();

    /**
     * 查询到的所有商品所涉及的所有分类
     */
    private Set<TypeVO> types = new HashSet<>();

    /**
     * 查询到的所有商品所涉及的所有属性(规格)
     */
    private Set<AttrVO> attrs = new HashSet<>();

    @Data
    public static class BrandVO {
        private Long brandId;
        private String brandName;
        private String brandImg;
    }

    @Data
    public static class TypeVO {
        private Long TypeId;
        private String TypeName;
    }

    @Data
    public static class AttrVO {
        private Long attrId;
        private String attrName;
        private List<String> attrValue;
    }

    @Data
    public static class BreadCrumbsVO {
        private String attrName;
        private String attrValue;
        private String link;
    }

在方法中把参数先备好

//定义参数
Set<SearchResult.BrandVO> brandVOList = new HashSet<>();
Set<SearchResult.TypeVO> typeList = new HashSet<>();
Set<SearchResult.AttrVO> attrList = new HashSet<>();

首先获取最外层的参数

有一点需要更改的 回调参数是Aggregations需要改成Terms才能调取方法

//获取聚合参数
Aggregations brandAggregations = response.getAggregations();

//获取品牌
Terms brandGations = brandAggregations.get("brandAgg");

循环获取参数添加到指定的集合当中,这个获取的就相当于是es当中key的值

for (Terms.Bucket bucket : brandGations.getBuckets()) {
//添加品牌
SearchResult.BrandVO brandVO = new SearchResult.BrandVO();
brandVO.setBrandName(bucket.getKeyAsString());
brandVOList.add(brandVO);
}

 因为我最外层只有一个分组,所以在循环中继续获取数据

这个bucket就相当于es当中获取下一层级因为我设定的brand和type都是一个层的所以都使用bucket来获取参数

get的变量就是相当于es中设置的名称然后我们拿到下面的key的值加入到我们的集合当中

注意一下这是基于上一层for循环中嵌套的

//获取类型
Aggregations aggregations = bucket.getAggregations();
Terms typeGations = aggregations.get("typeAgg");
//添加类型
for (Terms.Bucket typeGationsBucket : typeGations.getBuckets()) {
    SearchResult.TypeVO typeVO = new SearchResult.TypeVO();
    typeVO.setTypeName(typeGationsBucket.getKeyAsString());
    typeList.add(typeVO);
}

接下来就简单了,根据es当中设定好的层级关系一级一级的获取后在添加到我们设定好的集合当中

把其他的层级都一步一步获取出来

//获取spu
Terms ruleGations = aggregations.get("ruleAgg");
//添加spu
for (Terms.Bucket ruleGationsBucket : ruleGations.getBuckets()) {
    SearchResult.AttrVO attrVO = new SearchResult.AttrVO();
    attrVO.setAttrName(ruleGationsBucket.getKeyAsString());
    //获取sku
    Aggregations attrValueAggregations = ruleGationsBucket.getAggregations();
    Terms ruleValueGations = attrValueAggregations.get("ruleValueAgg");
    //添加sku
    for (Terms.Bucket ruleValueGationsBucket : ruleValueGations.getBuckets()) {
        ArrayList<String> attrValueList = new ArrayList<>();
        for (String attrValue : ruleValueGationsBucket.getKeyAsString().split(",")) {
            attrValueList.add(attrValue);
        }
        attrVO.setAttrValue(attrValueList);
    }
    attrList.add(attrVO);
}

 最后在添加到实体类的对象当中

//添加对象中数据
result.getProductInfoList().addAll(productInfoList);
result.getBrands().addAll(brandVOList);
result.getAttrs().addAll(attrList);
result.getTypes().addAll(typeList);

最后查询,就获取到了我们聚合后的值了,在根据业务进行下一步的操作

最后展示一下所有的代码

SearchResult result = new SearchResult();
try {
    //构建对象
    SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
    //构建聚合名称
    TermsAggregationBuilder brandAgg = AggregationBuilders.terms("brandAgg").field("brandName.keyword");
    TermsAggregationBuilder typeAgg = AggregationBuilders.terms("typeAgg").field("typeTwoName.keyword");
    TermsAggregationBuilder ruleAgg = AggregationBuilders.terms("ruleAgg").field("ruleName.keyword");
    TermsAggregationBuilder ruleValueAgg = AggregationBuilders.terms("ruleValueAgg").field("ruleAttrValue.keyword");
    //根据聚合分配层级
    brandAgg.subAggregation(typeAgg);
    brandAgg.subAggregation(ruleAgg);
    ruleAgg.subAggregation(ruleValueAgg);
    //添加最外层聚合
    searchSourceBuilder.aggregation(brandAgg);
    //定义参数
    Set<SearchResult.BrandVO> brandVOList = new HashSet<>();
    Set<SearchResult.TypeVO> typeList = new HashSet<>();
    Set<SearchResult.AttrVO> attrList = new HashSet<>();
    //获取聚合参数
    Aggregations brandAggregations = response.getAggregations();
    //获取品牌
    Terms brandGations = brandAggregations.get("brandAgg");
    for (Terms.Bucket bucket : brandGations.getBuckets()) {
        //添加品牌
        SearchResult.BrandVO brandVO = new SearchResult.BrandVO();
        brandVO.setBrandName(bucket.getKeyAsString());
        brandVOList.add(brandVO);
        //获取类型
        Aggregations aggregations = bucket.getAggregations();
        Terms typeGations = aggregations.get("typeAgg");
        //添加类型
        for (Terms.Bucket typeGationsBucket : typeGations.getBuckets()) {
            SearchResult.TypeVO typeVO = new SearchResult.TypeVO();
            typeVO.setTypeName(typeGationsBucket.getKeyAsString());
            typeList.add(typeVO);
        }
        //获取spu
        Terms ruleGations = aggregations.get("ruleAgg");
        //添加spu
        for (Terms.Bucket ruleGationsBucket : ruleGations.getBuckets()) {
            SearchResult.AttrVO attrVO = new SearchResult.AttrVO();
            attrVO.setAttrName(ruleGationsBucket.getKeyAsString());
            //获取sku
            Aggregations attrValueAggregations = ruleGationsBucket.getAggregations();
            Terms ruleValueGations = attrValueAggregations.get("ruleValueAgg");
            //添加sku
            for (Terms.Bucket ruleValueGationsBucket : ruleValueGations.getBuckets()) {
                ArrayList<String> attrValueList = new ArrayList<>();
                for (String attrValue : ruleValueGationsBucket.getKeyAsString().split(",")) {
                    attrValueList.add(attrValue);
                }
                attrVO.setAttrValue(attrValueList);
            }
            attrList.add(attrVO);
        }
    }
        //添加对象中数据
        result.getProductInfoList().addAll(productInfoList);
        result.getBrands().addAll(brandVOList);
        result.getAttrs().addAll(attrList);
        result.getTypes().addAll(typeList);
    }
}catch (Exception ex){
    log.error("检索ES失败: {}", ex);
}