本文要實現的一個功能,根據品牌、分類、規格、價格過濾查詢商品的功能,並對查詢結果的關鍵字
進行高亮顯示。只做後端功能。
本文是以代碼驅動
,如果看不太懂,可以先複製代碼,再慢慢看,註釋很詳細。
1、引入相關依賴
主要就是fastjson
和spring-boot-starter-data-elasticsearch
(SpringBoot項目),fastJson的作用是轉換對象使用,當然也可以進行時間格式化(本文未作處理)。
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-elasticsearch</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.28</version>
</dependency>
2、ElasticSearch數據測試準備
①創建Goods類,測試類裏注入相關對象
@Document(indexName = "goods_sku",type = "goods")
@Data
public class Goods {
@Id
@Field(type = FieldType.Long,store = true)
private Long id; // 主鍵Id
@Field(type = FieldType.Text,analyzer = "ik_smart",store = true)
private String name; // 商品名稱
@Field(type = FieldType.Integer,store = true)
private Integer price; // 商品價格
@Field(type = FieldType.Text,store = true,index = false)
private String image; // 商品圖片src
@Field(type = FieldType.Date,store = true,index = false)
private Date createTime; // 商品創建時間
@Field(type = FieldType.Long,store = true,index = false)
private Long spuId; // Spu的Id
@Field(type = FieldType.Keyword,store = true)
private String categoryName;// 分類名稱
@Field(type = FieldType.Keyword,store = true)
private String brandName; // 品牌名稱
@Field(type = FieldType.Object,store = true)
private Map spec; // 規格Map Map<String,String>,如<"顏色","黑色">
@Field(type = FieldType.Integer,store = true,index = false)
private Integer saleNum; // 銷量
public Goods(){
}
public Goods(Long id, String name, Integer price, String image, Date createTime, Long spuId, String categoryName, String brandName, Map spec, Integer saleNum) {
this.id = id;
this.name = name;
this.price = price;
this.image = image;
this.createTime = createTime;
this.spuId = spuId;
this.categoryName = categoryName;
this.brandName = brandName;
this.spec = spec;
this.saleNum = saleNum;
}
}
@Autowired
private ElasticsearchTemplate template;
@Autowired
private GoodsRepository goodsRepository;
@Autowired
private EsResultMapper esResultMapper;
②數據準備 - 儘量多準備一些數據,方便測試查詢
@Test
public void createIndex(){
template.createIndex(Goods.class);
}
@Test
public void createDoc(){
Map map1 = new HashMap();
map1.put("顏色","紫色");
map1.put("套餐","標準套餐");
Goods goods1 = new Goods(7L,"小米 Mini9祕境黑優惠套餐16G+64G",100,"xxxx",new Date(),2L,"手機","小米",map1,100);
goodsRepository.save(goods1);
// 使用saveAll批量存儲
}
3、構建基本查詢方法
該方法通過傳過來的條件Map
,根據條件進行過濾查詢,比如分類、品牌、規格、價格區間等(具體取決於需求)。
/**
* 構建基本查詢 - 搜索關鍵字、分類、品牌、規格、價格
* @param searchMap
* @return
*/
private BoolQueryBuilder buildBasicQuery(Map searchMap) {
// 構建布爾查詢
BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
// 關鍵字查詢
boolQueryBuilder.must(QueryBuilders.matchQuery("name",searchMap.get("keywords")));
// 分類、品牌、規格 都是需要精準查詢的,無需分詞
// 商品分類過濾
if (searchMap.get("category") != null){
boolQueryBuilder.filter(QueryBuilders.matchPhraseQuery("categoryName",searchMap.get("category")));
}
// 商品品牌過濾
if(searchMap.get("brand") != null){
boolQueryBuilder.filter(QueryBuilders.matchPhraseQuery("brandName",searchMap.get("brand")));
}
// 規格過濾
if(searchMap.get("spec") != null){
Map<String,String> map = (Map) searchMap.get("spec");
for(Map.Entry<String,String> entry : map.entrySet()){
// 規格查詢[spec.xxx],因爲規格是不確定的,所以需要精確查找,加上.keyword,如spec.顏色.keyword
boolQueryBuilder.filter(QueryBuilders.matchPhraseQuery("spec." + entry.getKey() + ".keyword",entry.getValue()));
}
}
// 價格過濾
if(searchMap.get("price") != null){
// 價格: 0-500 0-*
String[] prices = ((String)searchMap.get("price")).split("-");
if(!prices[0].equals("0")){ // 加兩個0是,因爲價格轉換成分
boolQueryBuilder.filter(QueryBuilders.rangeQuery("price").gt(prices[0] + "00"));
}
if(!prices[1].equals("*")){ // 價格有上限
boolQueryBuilder.filter(QueryBuilders.rangeQuery("price").lt(prices[1] + "00"));
}
}
return boolQueryBuilder;
}
4、查詢分類列表
主要是根據搜索關鍵字
查詢查詢出來的結果,將其分類,然後把分類查詢出來,顯示到前端。
/**
* 查詢分類列表
* @param searchMap
* @return
*/
private List<String> searchCategoryList(Map searchMap) {
NativeSearchQueryBuilder nativeSearchQueryBuilder = new NativeSearchQueryBuilder();
// 構建查詢
BoolQueryBuilder boolQueryBuilder = buildBasicQuery(searchMap);
nativeSearchQueryBuilder.withQuery(boolQueryBuilder);
// 分類聚合名
String groupName = "sku_category";
// 構建聚合查詢
TermsAggregationBuilder termsAggregationBuilder = AggregationBuilders.terms(groupName).field("categoryName");
nativeSearchQueryBuilder.addAggregation(termsAggregationBuilder);
// 獲取聚合分頁結果
AggregatedPage<Goods> goodsList = (AggregatedPage<Goods>) goodsRepository.search(nativeSearchQueryBuilder.build());
// 在查詢結果中找到聚合 - 根據聚合名稱
StringTerms stringTerms = (StringTerms) goodsList.getAggregation(groupName);
// 獲取桶
List<StringTerms.Bucket> buckets = stringTerms.getBuckets();
// 使用流Stream 將分類名存入集合
List<String> categoryList = buckets.stream().map(bucket -> bucket.getKeyAsString()).collect(Collectors.toList());
// 打印分類名稱
categoryList.forEach(System.out::println);
return categoryList;
}
既然有了分類,那麼肯定還有對應的品牌、規格。其實品牌和規格與分類是有一個聯繫的。ElasticSearch
查詢出分類,每個分類對應一個id
,也就是說所有分類和分類的id應該存到Redis
中去,這樣前端就可以根據返回的分類集合去查詢對應的品牌和規格,這裏只是提供一個實現思路。
String categoryName = ""; // 分類名
if(searchMap.get("category") == null){ // 如果查詢條件沒有分類
// 默認取分類列表的第一個
if(categoryList.size() > 0){
categoryName = categoryList.get(0);
}
}else{ // 如果查詢條件有分類
// 則取查詢條件中的分類
categoryName = searchMap.get("category");
}
// 根據分類名查詢品牌 - 實際應該從Redis中查詢
if(searchMap.get("brand")==null) {
List<Map> brandList = brandDao.findListByCategoryName(categoryName);
resultMap.put("brandList", brandList);
}
// 根據分類查詢規格 - 實際應該從Redis中查詢
List<Map> specList = specDao.findListByCategoryName(categoryName);
for(Map spec:specList){
// 規格選項列表 - 選項與選項之間是以,(逗號)分隔的
String[] options = ((String) spec.get("options")).split(",");
// 講過規格選項放入到規格對象中
spec.put("options",options);
}
// 將規格對象放入到結果集
resultMap.put("specList",specList);
5、重新實現SearchResultMapper
- 高亮前奏
因爲默認的SearchResultMapper
是沒有高亮的,我們需要重新實現,重寫AggregatedPage
方法。
@Component
public class EsResultMapper implements SearchResultMapper {
@Override
public <T> AggregatedPage<T> mapResults(SearchResponse response, Class<T> aClass, Pageable pageable) {
// 記錄總條數
long totalHits = response.getHits().getTotalHits();
// 記錄列表(泛型) - 構建Aggregate使用
List<T> list = Lists.newArrayList();
// 獲取搜索結果(真正的的記錄)
SearchHits hits = response.getHits();
for (SearchHit hit : hits) {
if(hits.getHits().length <= 0){
return null;
}
// 將原本的JSON對象轉換成Map對象
Map<String, Object> map = hit.getSourceAsMap();
// 獲取高亮的字段Map
Map<String, HighlightField> highlightFields = hit.getHighlightFields();
for (Map.Entry<String, HighlightField> highlightField : highlightFields.entrySet()) {
// 獲取高亮的Key
String key = highlightField.getKey();
// 獲取高亮的Value
HighlightField value = highlightField.getValue();
// 實際fragments[0]就是高亮的結果,無需遍歷拼接
Text[] fragments = value.getFragments();
StringBuilder sb = new StringBuilder();
for (Text text : fragments) {
sb.append(text);
}
// 因爲高亮的字段必然存在於Map中,就是key值
// 可能有一種情況,就是高亮的字段是嵌套Map,也就是說在Map裏面還有Map的這種情況,這裏沒有考慮
map.put(key, sb.toString());
}
// 把Map轉換成對象
T item = JSON.parseObject(JSONObject.toJSONString(map),aClass);
list.add(item);
}
// 返回的是帶分頁的結果
return new AggregatedPageImpl<>(list, pageable, totalHits);
}
}
6、查詢商品(sku)列表
/**
* 查詢Sku集合 - 商品列表
* @param searchMap 查詢條件
* @return
*/
private Map searchSkuList(Map searchMap) {
Map resultMap = new HashMap();
NativeSearchQueryBuilder nativeSearchQueryBuilder = new NativeSearchQueryBuilder();
BoolQueryBuilder boolQueryBuilder = buildBasicQuery(searchMap);
// 查詢
nativeSearchQueryBuilder.withQuery(boolQueryBuilder);
// 排序
String sortField = (String)searchMap.get("sortField"); // 排序字段
String sortRule = (String)searchMap.get("sortRule"); // 排序規則 - 順序(ASC)/倒序(DESC)
if(sortField!= null && !"".equals(sortField)){
nativeSearchQueryBuilder.withSort(SortBuilders.fieldSort(sortField).order(SortOrder.valueOf(sortRule)));
}
// 構建分頁
nativeSearchQueryBuilder.withPageable(PageRequest.of(0,15));
// 構建高亮查詢
HighlightBuilder.Field field = new HighlightBuilder.Field("name").preTags("<font style='color:red'>").postTags("</font>");
nativeSearchQueryBuilder.withHighlightFields(field); // 名字高亮
NativeSearchQuery build = nativeSearchQueryBuilder.build();
// 獲取查詢結果
AggregatedPage<Goods> goodsPage = template.queryForPage(build, Goods.class, esResultMapper);
long total = goodsPage.getTotalElements(); // 總數據量
long totalPage = goodsPage.getTotalPages(); // 總頁數
// ...你還要將是否有上頁下頁等內容傳過去
List<Goods> goodsList = goodsPage.getContent();
goodsList.forEach(System.out::println);
resultMap.put("rows",goodsList);
resultMap.put("total",total);
resultMap.put("totalPage",totalPage);
return resultMap;
}
7、查詢
/**
* 搜索方法 - searchMap應該由前端傳過來
* searchMap裏封裝了一些條件,根據條件進行過濾
*/
@Test
public void search(){
// 搜索條件Map
Map searchMap = new HashMap();
searchMap.put("keywords","小米");
// searchMap.put("category","手機");
// searchMap.put("brand","小米");
Map map = new HashMap();
map.put("顏色","紫色");
// map.put("",""); // 其他規格類型
searchMap.put("spec",map);
// searchMap.put("price","0-3000");
// 返回結果Map
Map resultMap = new HashMap();
// 查詢商品列表
resultMap.putAll(searchSkuList(searchMap));
// 查詢分類列表
List<String> categoryList = searchCategoryList(searchMap);
resultMap.put("categoryList",categoryList);
}
測試類完整代碼
@RunWith(SpringRunner.class)
@SpringBootTest
public class GoodsTest {
@Autowired
private ElasticsearchTemplate template;
@Autowired
private GoodsRepository goodsRepository;
@Autowired
private EsResultMapper esResultMapper;
@Test
public void createIndex(){
template.createIndex(Goods.class);
}
@Test
public void createDoc(){
// Map map1 = new HashMap();
// map1.put("顏色","藍色");
// map1.put("套餐","標準套餐");
// Goods goods1 = new Goods(2L,"Redmi Note7祕境黑優惠套餐16G+64G",100,"xxxx",new Date(),2L,"手機","小米",map1,100);
//
// Map map2 = new HashMap();
// map2.put("顏色","藍色");
// map2.put("套餐","標準套餐");
// Goods goods2 = new Goods(3L,"Redmi Note7祕境黑優惠套餐16G+64G",500,"xxxx",new Date(),3L,"手機","小米",map2,100);
//
// Map map3 = new HashMap();
// map3.put("顏色","黑色");
// map3.put("尺寸","64寸");
// Goods goods3 = new Goods(4L,"小米電視 黑色 64寸 優惠套餐",1000,"xxxx",new Date(),4L,"電視","小米",map3,100);
//
// Map map4 = new HashMap();
// map4.put("顏色","金色");
// map4.put("尺寸","46寸");
// Goods goods4 = new Goods(5L,"華爲電視 金色 46寸 優惠套餐",1500,"xxxx",new Date(),5L,"電視","華爲",map4,100);
//
// Map map5 = new HashMap();
// map5.put("顏色","白金色");
// map5.put("網絡制式","全網通5G");
// Goods goods5 = new Goods(6L,"華爲P30 金色 全網通5G 優惠套餐",2000,"xxxx",new Date(),6L,"手機","華爲",map5,100);
// List<Goods> list = new ArrayList<>();
// list.add(goods1);
// list.add(goods2);
// list.add(goods3);
// list.add(goods4);
// list.add(goods5);
// goodsRepository.saveAll(list);
Map map1 = new HashMap();
map1.put("顏色","紫色");
map1.put("套餐","標準套餐");
Goods goods1 = new Goods(7L,"小米 Mini9祕境黑優惠套餐16G+64G",100,"xxxx",new Date(),2L,"手機","小米",map1,100);
goodsRepository.save(goods1);
// Map map1 = new HashMap();
// map1.put("顏色","藍色");
// map1.put("套餐","標準套餐");
// Goods goods1 = new Goods(2L,"Redmi Note7祕境黑優惠套餐16G+64G",100,"xxxx",new Date(),2L,"手機","小米",map1,100);
// goodsRepository.save(goods1);
}
/**
* 搜索方法 - searchMap應該由前端傳過來
* searchMap裏封裝了一些條件,根據條件進行過濾
*/
@Test
public void search(){
// 搜索條件Map
Map searchMap = new HashMap();
searchMap.put("keywords","小米");
// searchMap.put("category","手機");
// searchMap.put("brand","小米");
Map map = new HashMap();
map.put("顏色","紫色");
// map.put("",""); // 其他規格類型
searchMap.put("spec",map);
// searchMap.put("price","0-3000");
// 返回結果Map
Map resultMap = new HashMap();
// 查詢商品列表
resultMap.putAll(searchSkuList(searchMap));
// 查詢分類列表
List<String> categoryList = searchCategoryList(searchMap);
resultMap.put("categoryList",categoryList);
}
/**
* 查詢Sku集合 - 商品列表
* @param searchMap 查詢條件
* @return
*/
private Map searchSkuList(Map searchMap) {
Map resultMap = new HashMap();
NativeSearchQueryBuilder nativeSearchQueryBuilder = new NativeSearchQueryBuilder();
BoolQueryBuilder boolQueryBuilder = buildBasicQuery(searchMap);
// 查詢
nativeSearchQueryBuilder.withQuery(boolQueryBuilder);
// 排序
String sortField = (String)searchMap.get("sortField"); // 排序字段
String sortRule = (String)searchMap.get("sortRule"); // 排序規則 - 順序(ASC)/倒序(DESC)
if(sortField!= null && !"".equals(sortField)){
nativeSearchQueryBuilder.withSort(SortBuilders.fieldSort(sortField).order(SortOrder.valueOf(sortRule)));
}
// 構建分頁
nativeSearchQueryBuilder.withPageable(PageRequest.of(0,15));
// 構建高亮查詢
HighlightBuilder.Field field = new HighlightBuilder.Field("name").preTags("<font style='color:red'>").postTags("</font>");
nativeSearchQueryBuilder.withHighlightFields(field); // 名字高亮
NativeSearchQuery build = nativeSearchQueryBuilder.build();
// 獲取查詢結果
AggregatedPage<Goods> goodsPage = template.queryForPage(build, Goods.class, esResultMapper);
long total = goodsPage.getTotalElements(); // 總數據量
long totalPage = goodsPage.getTotalPages(); // 總頁數
// ...你還要將是否有上頁下頁等內容傳過去
List<Goods> goodsList = goodsPage.getContent();
goodsList.forEach(System.out::println);
resultMap.put("rows",goodsList);
resultMap.put("total",total);
resultMap.put("totalPage",totalPage);
return resultMap;
}
/**
* 查詢分類列表
* @param searchMap
* @return
*/
private List<String> searchCategoryList(Map searchMap) {
NativeSearchQueryBuilder nativeSearchQueryBuilder = new NativeSearchQueryBuilder();
// 構建查詢
BoolQueryBuilder boolQueryBuilder = buildBasicQuery(searchMap);
nativeSearchQueryBuilder.withQuery(boolQueryBuilder);
// 分類聚合名
String groupName = "sku_category";
// 構建聚合查詢
TermsAggregationBuilder termsAggregationBuilder = AggregationBuilders.terms(groupName).field("categoryName");
nativeSearchQueryBuilder.addAggregation(termsAggregationBuilder);
// 獲取聚合分頁結果
AggregatedPage<Goods> goodsList = (AggregatedPage<Goods>) goodsRepository.search(nativeSearchQueryBuilder.build());
// 在查詢結果中找到聚合 - 根據聚合名稱
StringTerms stringTerms = (StringTerms) goodsList.getAggregation(groupName);
// 獲取桶
List<StringTerms.Bucket> buckets = stringTerms.getBuckets();
// 使用流Stream 將分類名存入集合
List<String> categoryList = buckets.stream().map(bucket -> bucket.getKeyAsString()).collect(Collectors.toList());
// 打印分類名稱
categoryList.forEach(System.out::println);
return categoryList;
}
/**
* 構建基本查詢 - 搜索關鍵字、分類、品牌、規格、價格
* @param searchMap
* @return
*/
private BoolQueryBuilder buildBasicQuery(Map searchMap) {
// 構建布爾查詢
BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
// 關鍵字查詢
boolQueryBuilder.must(QueryBuilders.matchQuery("name",searchMap.get("keywords")));
// 分類、品牌、規格 都是需要精準查詢的,無需分詞
// 商品分類過濾
if (searchMap.get("category") != null){
boolQueryBuilder.filter(QueryBuilders.matchPhraseQuery("categoryName",searchMap.get("category")));
}
// 商品品牌過濾
if(searchMap.get("brand") != null){
boolQueryBuilder.filter(QueryBuilders.matchPhraseQuery("brandName",searchMap.get("brand")));
}
// 規格過濾
if(searchMap.get("spec") != null){
Map<String,String> map = (Map) searchMap.get("spec");
for(Map.Entry<String,String> entry : map.entrySet()){
// 規格查詢[spec.xxx],因爲規格是不確定的,所以需要精確查找,加上.keyword,如spec.顏色.keyword
boolQueryBuilder.filter(QueryBuilders.matchPhraseQuery("spec." + entry.getKey() + ".keyword",entry.getValue()));
}
}
// 價格過濾
if(searchMap.get("price") != null){
// 價格: 0-500 0-*
String[] prices = ((String)searchMap.get("price")).split("-");
if(!prices[0].equals("0")){ // 加兩個0是,因爲價格轉換成分
boolQueryBuilder.filter(QueryBuilders.rangeQuery("price").gt(prices[0] + "00"));
}
if(!prices[1].equals("*")){ // 價格有上限
boolQueryBuilder.filter(QueryBuilders.rangeQuery("price").lt(prices[1] + "00"));
}
}
return boolQueryBuilder;
}
}