Elasticsearch项目实战,商品搜索功能设计与实现!
2020-04-16 本文已影响0人
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摘要
上次写了一篇《Elasticsearch快速入门,掌握这些刚刚好!》,带大家学习了下Elasticsearch的基本用法,这次我们来篇实战教程,以mall项目中的商品搜索为例,把Elasticsearch用起来!
中文分词器
由于商品搜索会涉及中文搜索,Elasticsearch需要安装插件才可以支持,我们先来了解下中文分词器,这里使用的是IKAnalyzer。在《Elasticsearch快速入门,掌握这些刚刚好!》中已经讲过其安装方式,这里直接讲解它的用法。
使用IKAnalyzer
- 使用默认分词器,可以发现默认分词器只是将中文逐词分隔,并不符合我们的需求;
GET /pms/_analyze{ "text": "小米手机性价比很高", "tokenizer": "standard"}
Elasticsearch项目实战,商品搜索功能设计与实现!
- 使用中文分词器以后,可以将中文文本按语境进行分隔,可以满足我们的需求。
GET /pms/_analyze{ "text": "小米手机性价比很高", "tokenizer": "ik_max_word"}
Elasticsearch项目实战,商品搜索功能设计与实现!
在SpringBoot中使用
在SpringBoot中使用Elasticsearch本文不再赘述,直接参考《mall整合Elasticsearch实现商品搜索》即可。这里需要提一下,对于需要进行中文分词的字段,我们直接使用@Field注解将analyzer属性设置为ik_max_word即可。
/** * 搜索中的商品信息 * Created by macro on 2018/6/19. */@Document(indexName = "pms", type = "product",shards = 1,replicas = 0)public class EsProduct implements Serializable { private static final long serialVersionUID = -1L; @Id private Long id; @Field(analyzer = "ik_max_word",type = FieldType.Text) private String name; @Field(analyzer = "ik_max_word",type = FieldType.Text) private String subTitle; @Field(analyzer = "ik_max_word",type = FieldType.Text) private String keywords; //省略若干代码......}
简单商品搜索
我们先来实现一个最简单的商品搜索,搜索商品名称、副标题、关键词中包含指定关键字的商品。
- 使用Query DSL调用Elasticsearch的Restful API实现;
POST /pms/product/_search{ "from": 0, "size": 2, "query": { "multi_match": { "query": "小米", "fields": [ "name", "subTitle", "keywords" ] } }}
Elasticsearch项目实战,商品搜索功能设计与实现!
- 在SpringBoot中实现,使用Elasticsearch Repositories的衍生查询来搜索;
/** * 商品搜索管理Service实现类 * Created by macro on 2018/6/19. */@Servicepublic class EsProductServiceImpl implements EsProductService { @Override public Page<EsProduct> search(String keyword, Integer pageNum, Integer pageSize) { Pageable pageable = PageRequest.of(pageNum, pageSize); return productRepository.findByNameOrSubTitleOrKeywords(keyword, keyword, keyword, pageable); }}
- 衍生查询其实原理很简单,就是将一定规则方法名称的方法转化为Elasticsearch的Query DSL语句,看完下面这张表你就懂了。
综合商品搜索
接下来我们来实现一个复杂的商品搜索,涉及到过滤、不同字段匹配权重不同以及可以进行排序。
- 首先来说下我们的需求,按输入的关键字搜索商品名称、副标题和关键词,可以按品牌和分类进行筛选,可以有5种排序方式,默认按相关度进行排序,看下接口文档有助于理解;
- 这里我们有一点特殊的需求,比如商品名称匹配关键字的的商品我们认为与搜索条件更匹配,其次是副标题和关键字,这时就需要用到function_score查询了;
- 在Elasticsearch中搜索到文档的相关性由_score字段来表示的,文档的_score字段值越高,表示与搜索条件越匹配,而function_score查询可以通过设置权重来影响_score字段值,使用它我们就可以实现上面的需求了;
- 使用Query DSL调用Elasticsearch的Restful API实现,可以发现商品名称权重设置为了10,商品副标题权重设置为了5,商品关键字设置为了2;
POST /pms/product/_search{ "query": { "function_score": { "query": { "bool": { "must": [ { "match_all": {} } ], "filter": { "bool": { "must": [ { "term": { "brandId": 6 } }, { "term": { "productCategoryId": 19 } } ] } } } }, "functions": [ { "filter": { "match": { "name": "小米" } }, "weight": 10 }, { "filter": { "match": { "subTitle": "小米" } }, "weight": 5 }, { "filter": { "match": { "keywords": "小米" } }, "weight": 2 } ], "score_mode": "sum", "min_score": 2 } }, "sort": [ { "_score": { "order": "desc" } } ]}
Elasticsearch项目实战,商品搜索功能设计与实现!
- 在SpringBoot中实现,使用Elasticsearch Repositories的search方法来实现,但需要自定义查询条件QueryBuilder;
/** * 商品搜索管理Service实现类 * Created by macro on 2018/6/19. */@Servicepublic class EsProductServiceImpl implements EsProductService { @Override public Page<EsProduct> search(String keyword, Long brandId, Long productCategoryId, Integer pageNum, Integer pageSize,Integer sort) { Pageable pageable = PageRequest.of(pageNum, pageSize); NativeSearchQueryBuilder nativeSearchQueryBuilder = new NativeSearchQueryBuilder(); //分页 nativeSearchQueryBuilder.withPageable(pageable); //过滤 if (brandId != null || productCategoryId != null) { BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery(); if (brandId != null) { boolQueryBuilder.must(QueryBuilders.termQuery("brandId", brandId)); } if (productCategoryId != null) { boolQueryBuilder.must(QueryBuilders.termQuery("productCategoryId", productCategoryId)); } nativeSearchQueryBuilder.withFilter(boolQueryBuilder); } //搜索 if (StringUtils.isEmpty(keyword)) { nativeSearchQueryBuilder.withQuery(QueryBuilders.matchAllQuery()); } else { List<FunctionScoreQueryBuilder.FilterFunctionBuilder> filterFunctionBuilders = new ArrayList<>(); filterFunctionBuilders.add(new FunctionScoreQueryBuilder.FilterFunctionBuilder(QueryBuilders.matchQuery("name", keyword), ScoreFunctionBuilders.weightFactorFunction(10))); filterFunctionBuilders.add(new FunctionScoreQueryBuilder.FilterFunctionBuilder(QueryBuilders.matchQuery("subTitle", keyword), ScoreFunctionBuilders.weightFactorFunction(5))); filterFunctionBuilders.add(new FunctionScoreQueryBuilder.FilterFunctionBuilder(QueryBuilders.matchQuery("keywords", keyword), ScoreFunctionBuilders.weightFactorFunction(2))); FunctionScoreQueryBuilder.FilterFunctionBuilder[] builders = new FunctionScoreQueryBuilder.FilterFunctionBuilder[filterFunctionBuilders.size()]; filterFunctionBuilders.toArray(builders); FunctionScoreQueryBuilder functionScoreQueryBuilder = QueryBuilders.functionScoreQuery(builders) .scoreMode(FunctionScoreQuery.ScoreMode.SUM) .setMinScore(2); nativeSearchQueryBuilder.withQuery(functionScoreQueryBuilder); } //排序 if(sort==1){ //按新品从新到旧 nativeSearchQueryBuilder.withSort(SortBuilders.fieldSort("id").order(SortOrder.DESC)); }else if(sort==2){ //按销量从高到低 nativeSearchQueryBuilder.withSort(SortBuilders.fieldSort("sale").order(SortOrder.DESC)); }else if(sort==3){ //按价格从低到高 nativeSearchQueryBuilder.withSort(SortBuilders.fieldSort("price").order(SortOrder.ASC)); }else if(sort==4){ //按价格从高到低 nativeSearchQueryBuilder.withSort(SortBuilders.fieldSort("price").order(SortOrder.DESC)); }else{ //按相关度 nativeSearchQueryBuilder.withSort(SortBuilders.scoreSort().order(SortOrder.DESC)); } nativeSearchQueryBuilder.withSort(SortBuilders.scoreSort().order(SortOrder.DESC)); NativeSearchQuery searchQuery = nativeSearchQueryBuilder.build(); LOGGER.info("DSL:{}", searchQuery.getQuery().toString()); return productRepository.search(searchQuery); }}
相关商品推荐
当我们查看相关商品的时候,一般底部会有一些商品推荐,这里使用Elasticsearch来简单实现下。
- 首先来说下我们的需求,可以根据指定商品的ID来查找相关商品,看下接口文档有助于理解;
- 这里我们的实现原理是这样的:首先根据ID获取指定商品信息,然后以指定商品的名称、品牌和分类来搜索商品,并且要过滤掉当前商品,调整搜索条件中的权重以获取最好的匹配度;
- 使用Query DSL调用Elasticsearch的Restful API实现;
POST /pms/product/_search{ "query": { "function_score": { "query": { "bool": { "must": [ { "match_all": {} } ], "filter": { "bool": { "must_not": { "term": { "id": 28 } } } } } }, "functions": [ { "filter": { "match": { "name": "红米5A" } }, "weight": 8 }, { "filter": { "match": { "subTitle": "红米5A" } }, "weight": 2 }, { "filter": { "match": { "keywords": "红米5A" } }, "weight": 2 }, { "filter": { "term": { "brandId": 6 } }, "weight": 5 }, { "filter": { "term": { "productCategoryId": 19 } }, "weight": 3 } ], "score_mode": "sum", "min_score": 2 } }}
Elasticsearch项目实战,商品搜索功能设计与实现!
- 在SpringBoot中实现,使用Elasticsearch Repositories的search方法来实现,但需要自定义查询条件QueryBuilder;
/** * 商品搜索管理Service实现类 * Created by macro on 2018/6/19. */@Servicepublic class EsProductServiceImpl implements EsProductService { @Override public Page<EsProduct> recommend(Long id, Integer pageNum, Integer pageSize) { Pageable pageable = PageRequest.of(pageNum, pageSize); List<EsProduct> esProductList = productDao.getAllEsProductList(id); if (esProductList.size() > 0) { EsProduct esProduct = esProductList.get(0); String keyword = esProduct.getName(); Long brandId = esProduct.getBrandId(); Long productCategoryId = esProduct.getProductCategoryId(); //根据商品标题、品牌、分类进行搜索 List<FunctionScoreQueryBuilder.FilterFunctionBuilder> filterFunctionBuilders = new ArrayList<>(); filterFunctionBuilders.add(new FunctionScoreQueryBuilder.FilterFunctionBuilder(QueryBuilders.matchQuery("name", keyword), ScoreFunctionBuilders.weightFactorFunction(8))); filterFunctionBuilders.add(new FunctionScoreQueryBuilder.FilterFunctionBuilder(QueryBuilders.matchQuery("subTitle", keyword), ScoreFunctionBuilders.weightFactorFunction(2))); filterFunctionBuilders.add(new FunctionScoreQueryBuilder.FilterFunctionBuilder(QueryBuilders.matchQuery("keywords", keyword), ScoreFunctionBuilders.weightFactorFunction(2))); filterFunctionBuilders.add(new FunctionScoreQueryBuilder.FilterFunctionBuilder(QueryBuilders.matchQuery("brandId", brandId), ScoreFunctionBuilders.weightFactorFunction(5))); filterFunctionBuilders.add(new FunctionScoreQueryBuilder.FilterFunctionBuilder(QueryBuilders.matchQuery("productCategoryId", productCategoryId), ScoreFunctionBuilders.weightFactorFunction(3))); FunctionScoreQueryBuilder.FilterFunctionBuilder[] builders = new FunctionScoreQueryBuilder.FilterFunctionBuilder[filterFunctionBuilders.size()]; filterFunctionBuilders.toArray(builders); FunctionScoreQueryBuilder functionScoreQueryBuilder = QueryBuilders.functionScoreQuery(builders) .scoreMode(FunctionScoreQuery.ScoreMode.SUM) .setMinScore(2); //用于过滤掉相同的商品 BoolQueryBuilder boolQueryBuilder = new BoolQueryBuilder(); boolQueryBuilder.mustNot(QueryBuilders.termQuery("id",id)); //构建查询条件 NativeSearchQueryBuilder builder = new NativeSearchQueryBuilder(); builder.withQuery(functionScoreQueryBuilder); builder.withFilter(boolQueryBuilder); builder.withPageable(pageable); NativeSearchQuery searchQuery = builder.build(); LOGGER.info("DSL:{}", searchQuery.getQuery().toString()); return productRepository.search(searchQuery); } return new PageImpl<>(null); }}
聚合搜索商品相关信息
在搜索商品时,经常会有一个筛选界面来帮助我们找到想要的商品,这里使用Elasticsearch来简单实现下。
- 首先来说下我们的需求,可以根据搜索关键字获取到与关键字匹配商品相关的分类、品牌以及属性,下面这张图有助于理解;
- 这里我们可以使用Elasticsearch的聚合来实现,搜索出相关商品,聚合出商品的品牌、商品的分类以及商品的属性,只要出现次数最多的前十个即可;
- 使用Query DSL调用Elasticsearch的Restful API实现;
POST /pms/product/_search{ "query": { "multi_match": { "query": "小米", "fields": [ "name", "subTitle", "keywords" ] } }, "size": 0, "aggs": { "brandNames": { "terms": { "field": "brandName", "size": 10 } }, "productCategoryNames": { "terms": { "field": "productCategoryName", "size": 10 } }, "allAttrValues": { "nested": { "path": "attrValueList" }, "aggs": { "productAttrs": { "filter": { "term": { "attrValueList.type": 1 } }, "aggs": { "attrIds": { "terms": { "field": "attrValueList.productAttributeId", "size": 10 }, "aggs": { "attrValues": { "terms": { "field": "attrValueList.value", "size": 10 } }, "attrNames": { "terms": { "field": "attrValueList.name", "size": 10 } } } } } } } } }}
- 比如我们搜索小米这个关键字的时候,聚合出了下面的分类和品牌信息;
- 聚合出了屏幕尺寸为5.0和5.8的筛选属性信息;
- 在SpringBoot中实现,聚合操作比较复杂,已经超出了Elasticsearch Repositories的使用范围,需要直接使用ElasticsearchTemplate来实现;
/** * 商品搜索管理Service实现类 * Created by macro on 2018/6/19. */@Servicepublic class EsProductServiceImpl implements EsProductService { @Override public EsProductRelatedInfo searchRelatedInfo(String keyword) { NativeSearchQueryBuilder builder = new NativeSearchQueryBuilder(); //搜索条件 if(StringUtils.isEmpty(keyword)){ builder.withQuery(QueryBuilders.matchAllQuery()); }else{ builder.withQuery(QueryBuilders.multiMatchQuery(keyword,"name","subTitle","keywords")); } //聚合搜索品牌名称 builder.addAggregation(AggregationBuilders.terms("brandNames").field("brandName")); //集合搜索分类名称 builder.addAggregation(AggregationBuilders.terms("productCategoryNames").field("productCategoryName")); //聚合搜索商品属性,去除type=1的属性 AbstractAggregationBuilder aggregationBuilder = AggregationBuilders.nested("allAttrValues","attrValueList") .subAggregation(AggregationBuilders.filter("productAttrs",QueryBuilders.termQuery("attrValueList.type",1)) .subAggregation(AggregationBuilders.terms("attrIds") .field("attrValueList.productAttributeId") .subAggregation(AggregationBuilders.terms("attrValues") .field("attrValueList.value")) .subAggregation(AggregationBuilders.terms("attrNames") .field("attrValueList.name")))); builder.addAggregation(aggregationBuilder); NativeSearchQuery searchQuery = builder.build(); return elasticsearchTemplate.query(searchQuery, response -> { LOGGER.info("DSL:{}",searchQuery.getQuery().toString()); return convertProductRelatedInfo(response); }); } /** * 将返回结果转换为对象 */ private EsProductRelatedInfo convertProductRelatedInfo(SearchResponse response) { EsProductRelatedInfo productRelatedInfo = new EsProductRelatedInfo(); Map<String, Aggregation> aggregationMap = response.getAggregations().getAsMap(); //设置品牌 Aggregation brandNames = aggregationMap.get("brandNames"); List<String> brandNameList = new ArrayList<>(); for(int i = 0; i<((Terms) brandNames).getBuckets().size(); i++){ brandNameList.add(((Terms) brandNames).getBuckets().get(i).getKeyAsString()); } productRelatedInfo.setBrandNames(brandNameList); //设置分类 Aggregation productCategoryNames = aggregationMap.get("productCategoryNames"); List<String> productCategoryNameList = new ArrayList<>(); for(int i=0;i<((Terms) productCategoryNames).getBuckets().size();i++){ productCategoryNameList.add(((Terms) productCategoryNames).getBuckets().get(i).getKeyAsString()); } productRelatedInfo.setProductCategoryNames(productCategoryNameList); //设置参数 Aggregation productAttrs = aggregationMap.get("allAttrValues"); List<LongTerms.Bucket> attrIds = ((LongTerms) ((InternalFilter) ((InternalNested) productAttrs).getProperty("productAttrs")).getProperty("attrIds")).getBuckets(); List<EsProductRelatedInfo.ProductAttr> attrList = new ArrayList<>(); for (Terms.Bucket attrId : attrIds) { EsProductRelatedInfo.ProductAttr attr = new EsProductRelatedInfo.ProductAttr(); attr.setAttrId((Long) attrId.getKey()); List<String> attrValueList = new ArrayList<>(); List<StringTerms.Bucket> attrValues = ((StringTerms) attrId.getAggregations().get("attrValues")).getBuckets(); List<StringTerms.Bucket> attrNames = ((StringTerms) attrId.getAggregations().get("attrNames")).getBuckets(); for (Terms.Bucket attrValue : attrValues) { attrValueList.add(attrValue.getKeyAsString()); } attr.setAttrValues(attrValueList); if(!CollectionUtils.isEmpty(attrNames)){ String attrName = attrNames.get(0).getKeyAsString(); attr.setAttrName(attrName); } attrList.add(attr); } productRelatedInfo.setProductAttrs(attrList); return productRelatedInfo; }}
参考资料
关于Spring Data Elasticsearch的具体使用可以参考官方文档。
docs.spring.io/spring-data…
项目地址
github.com/macrozheng/…
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作者:MacroZheng
链接:https://juejin.im/post/5e94587f51882573be11cb83
来源:掘金