Springdata mongodb聚合匹配

import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.data.mongodb.core.aggregation.Aggregation;
import org.springframework.data.mongodb.core.aggregation.MatchOperation;
import org.springframework.data.mongodb.core.query.Criteria;

// 创建MongoTemplate实例
MongoTemplate mongoTemplate = new MongoTemplate();

// 创建匹配条件
Criteria criteria = Criteria.where("age").gt(18);

// 创建匹配操作
MatchOperation matchOperation = Aggregation.match(criteria);

// 创建聚合管道
Aggregation aggregation = Aggregation.newAggregation(matchOperation);

// 执行聚合查询
List<Document> results = mongoTemplate.aggregate(aggregation, "collectionName", Document.class).getMappedResults();