SpringBoot项目集成Elasticsearch实例

导包

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

配置es连接

spring:data:elasticsearch:cluster-name: elasticsearchcluster-nodes: 127.0.0.1:9300

准备query接收查询条件

@Data
public class CarSearchQuery extends BaseQuery {private Long carType;private Double maxPrice;private Double minPrice;//0 以下 1 以上private Integer carAgeType;private Integer carAge;//是否超值private Integer costEffective;//急售private Integer rushSale;//准新车private Integer quasiNewCar;//可迁全国private Integer transitiveCountry;//排序字段private String sortField;//排序类型 desc降序 asc升序号private String sortType;private Double longitude;private Double latitude;private Double distance;private Long shopId;
}

准备Controller

@RestController
@RequestMapping("/car/search")
public class CarSearchController {@Autowiredprivate ICarSearchService carSearchService;@PostMappingpublic AjaxResult search(@RequestBody CarSearchQuery query) {PageList<CarDoc> search = carSearchService.search(query);return AjaxResult.me().setData(search);}
}

定义Document文档类型

@Data
@AllArgsConstructor
@NoArgsConstructor
@Document(indexName = "example-car", type = "car")
public class CarDoc {@Idprivate Long id;@Field(type = FieldType.Text, analyzer = "ik_smart", searchAnalyzer = "ik_smart")private String title;@Field(type = FieldType.Keyword)private String cover;@Field(type = FieldType.Double)private BigDecimal salePrice;@Field(type = FieldType.Double)private BigDecimal costPrice;@Field(type = FieldType.Integer)private Integer isNew;@Field(type = FieldType.Date)private Date registerTime;@Field(type = FieldType.Double)private Double mileAge;@Field(type = FieldType.Long)private Long shopId;@MultiField(mainField = @Field(type = FieldType.Text, analyzer = "ik_smart", searchAnalyzer = "ik_smart"),otherFields = {@InnerField(type = FieldType.Keyword, suffix = "keyword")})private String shopName; // @MultiField对同一字段应用不同的分析器或存储策略,这里既可以将该字段按照text进行拆分，也可以作为keyword进行查询@Field(type = FieldType.Keyword)private String shopAddress;@Field(type = FieldType.Date)private Date onSaleTime;@Field(type = FieldType.Integer)private Integer costEffective;@Field(type = FieldType.Integer)private Integer rushSale;@Field(type = FieldType.Integer)private Integer quasiNewCar;@Field(type = FieldType.Integer)private Integer transitiveCountry;@Field(type = FieldType.Long)private Long typeId;@MultiField(mainField = @Field(type = FieldType.Text, analyzer = "ik_smart", searchAnalyzer = "ik_smart"),otherFields = {@InnerField(type = FieldType.Keyword, suffix = "keyword")})private String typeName; @Field(type = FieldType.Text, analyzer = "ik_smart", searchAnalyzer = "ik_smart")private String carInfo;@GeoPointField   // 表示坐标类型private GeoPoint shopPoint;  
}

准备一个Repository接口

@Repository
public interface CarDocRepository extends ElasticsearchRepository<CarDoc, Long> {
}// 接口中的泛型，一个是文档对象的类型，一个是文档对象id的类型

使用spring-boot-starter-data-elasticsearch对es进行操作时也要按照es请求的格式进行操作

{"query": {"bool": {"must": {"match_all": {}},"filter": {"term": {"username": "Steven King"}}}}
}

查询

@Service
public class CarSearchServiceImpl implements ICarSearchService {@Autowiredprivate CarDocRepository repository;@Autowiredprivate HighlightResultMapper highlightResultMapper;@Autowiredprivate ElasticsearchTemplate elasticsearchTemplate;@Overridepublic PageList<CarDoc> search(CarSearchQuery query) {NativeSearchQueryBuilder builder = new NativeSearchQueryBuilder();BoolQueryBuilder boole = QueryBuilders.boolQuery(); // 外层的boolList<QueryBuilder> filter = boole.filter();		// 内层的fitlerList<QueryBuilder> must = boole.must();		// 内层的must// 查询"title", "typeName", "shopName", "carInfo"中有查询关键字的结果if (StringUtils.isNotBlank(query.getSearch())) {must.add(QueryBuilders.multiMatchQuery(query.getSearch(), "title", "typeName", "shopName", "carInfo"));}if (Objects.nonNull(query.getShopId())) {filter.add(QueryBuilders.termQuery("shopId", query.getShopId()));}// 进行范围查询if (Objects.nonNull(query.getMinPrice())) {filter.add(QueryBuilders.rangeQuery("costPrice").gte(query.getMinPrice()));}if (Objects.nonNull(query.getMaxPrice())) {filter.add(QueryBuilders.rangeQuery("costPrice").lte(query.getMaxPrice()));}// 按时间进行查找if (Objects.nonNull(query.getCarAge())) {Date date = DateUtils.addYears(new Date(), (-query.getCarAge()));if (query.getCarAgeType() == 1) {filter.add(QueryBuilders.rangeQuery("registerTime").lt(date.getTime()));}if (query.getCarAgeType() == 0) {filter.add(QueryBuilders.rangeQuery("registerTime").gte(date.getTime()));}}// 经纬度Double lon = query.getLongitude();Double lat = query.getLatitude();// 按照经纬度计算距离并按照距离进行查询if (Objects.nonNull(lon) && Objects.nonNull(lat) && Objects.nonNull(query.getDistance())) {GeoDistanceQueryBuilder point = QueryBuilders.geoDistanceQuery("shopPoint").point(lat, lon).distance(query.getDistance(), DistanceUnit.KILOMETERS);filter.add(point);}// 将bool加入到最外层query的构造器builder.withQuery(boole);SortOrder order = SortOrder.ASC;if (!"asc".equals(query.getSortType())) {order = SortOrder.DESC;}// 通过指定字段进行排序if (Objects.nonNull(query.getSortField())) {FieldSortBuilder sort = SortBuilders.fieldSort(query.getSortField()).order(order);builder.withSort(sort);} else {// 没传则默认按照距离排序if (Objects.nonNull(lat) && Objects.nonNull(lon)) {GeoDistanceSortBuilder point = new GeoDistanceSortBuilder("shopPoint", lat, lon);GeoDistanceSortBuilder sort = point.order(order);builder.withSort(sort);}}// 高亮展示，通过给字段前后加html标签的方式实现高亮等效果，需要一个高亮的工具类HighlightBuilder.Field title = new HighlightBuilder.Field("title").preTags("<span style='color:red'>").postTags("</span>");builder.withHighlightFields(title);// 进行分页展示builder.withPageable(PageRequest.of(query.getCurrentPage() - 1, query.getPageSize()));TermsAggregationBuilder aggBuilders1 = AggregationBuilders.terms("typeIdGroup").field("typeId").order(BucketOrder.count(true)).subAggregation(AggregationBuilders.terms("typeNameGroup").field("typeName.keyword").order(BucketOrder.count(true)));// 聚合查询builder.addAggregation(aggBuilders1);AggregatedPage<CarDoc> carDocs = elasticsearchTemplate.queryForPage(builder.build(), CarDoc.class, highlightResultMapper);Map<String, Object> map = SearchUtil.handleTermsAggsData(carDocs.getAggregations());Long counts = carDocs.getTotalElements();List<CarDoc> content = carDocs.getContent();for (CarDoc doc : content) {String s = doc.getShopAddress();if (StringUtils.isNotBlank(s)) {String string = s.split("市")[0] + "市";}doc.setShopAddress(s);}return new PageList<>(counts, content, map);}
}

PageList

@Data
public class PageList<T> {private Long count;private List<T> data; // 用于存放聚合查询的数据private Map<String,Object> map;public PageList() {}public PageList(Long count, List<T> data, Map<String, Object> map) {this.count = count;this.data = data;this.map = map;}public PageList(Long count, List<T> data) {this.count = count;this.data = data;}
}

高亮结果映射器

@Component
public class HighlightResultMapper implements SearchResultMapper {@Overridepublic <T> AggregatedPage<T> mapResults(SearchResponse response, Class<T> aClass, Pageable pageable) {// 记录总条数long totalHits = response.getHits().getTotalHits();// 记录列表(泛型) - 构建Aggregate使用List<T> list = new ArrayList<>();// 获取搜索结果(真正的的记录)SearchHits hits = response.getHits();for (SearchHit hit : hits) {if(hits.getHits().length <= 0){return null;}// 将原本的JSON对象转换成Map对象Map<String, Object> map = hit.getSourceAsMap();// 获取高亮的字段MapMap<String, HighlightField> highlightFields = hit.getHighlightFields();for (Map.Entry<String, HighlightField> highlightField : highlightFields.entrySet()) {// 获取高亮的KeyString key = highlightField.getKey();// 获取高亮的ValueHighlightField value = highlightField.getValue();// 实际fragments[0]就是高亮的结果，无需遍历拼接Text[] fragments = value.getFragments();StringBuilder sb = new StringBuilder();for (Text text : fragments) {sb.append(text);}// 因为高亮的字段必然存在于Map中，就是key值// 可能有一种情况，就是高亮的字段是嵌套Map，也就是说在Map里面还有Map的这种情况，这里没有考虑map.put(key, sb.toString());}// 把Map转换成对象T item = JSONObject.parseObject(JSONObject.toJSONString(map),aClass);list.add(item);}// 返回的是带分页的结果return new AggregatedPageImpl<>(list, pageable, totalHits,response.getAggregations()); //获取聚合结果}@Overridepublic <T> T mapSearchHit(SearchHit searchHit, Class<T> aClass) {return null;}
}

搜索工具类，用于处理聚合查询结果

public class SearchUtil {/*** 处理terms聚合   id  name* @param aggregations* @return*/public static Map<String, Object> handleTermsAggsData(Aggregations aggregations) {// 获取聚合查询结果Map<String, Aggregation> aggregationsMap = aggregations.getAsMap();Set<Map.Entry<String, Aggregation>> entries = aggregationsMap.entrySet();Iterator<Map.Entry<String, Aggregation>> iterator = entries.iterator();//6.1有多少聚合就要返回多少个key-List<IdName>Map<String, Object> aggsData = new HashMap<>();while (iterator.hasNext()) {Map.Entry<String, Aggregation> entry = iterator.next();String key = entry.getKey();System.out.println(key);Aggregation aggsId = entry.getValue();if (aggsId instanceof LongTerms) {   //6.2 拿到id聚合,并且必须是LongTermsLongTerms aggsIdLong = (LongTerms) aggsId;List<LongTerms.Bucket> buckets = aggsIdLong.getBuckets();//6.3 List<IdName<Long,String>List<IdName> list = new ArrayList<>();buckets.forEach(bucket -> {String idStr = bucket.getKeyAsString();//6.4 通过子聚合获取nameMap<String, Aggregation> subAggs = bucket.getAggregations().getAsMap();Set<Map.Entry<String, Aggregation>> entries1 = subAggs.entrySet();//直接获取第一个Map.Entry<String, Aggregation> nameAggEntry = entries1.iterator().next();Aggregation nameAgg = nameAggEntry.getValue();if (nameAgg instanceof StringTerms) {StringTerms nameAggStringTerms = (StringTerms) nameAgg;String nameStr = nameAggStringTerms.getBuckets().get(0).getKeyAsString();IdName idName = new IdName();idName.setId(Long.valueOf(idStr));idName.setName(nameStr);list.add(idName);}});aggsData.put(key, list);}}return aggsData;}
}