一、嵌套数组

数据：

{"arrays": [{"keyArrays": [{"key": "index","key2": "index2"},{"key": "index1","key2": "index2"}]}]
}

mongo语法

db.collection.find({arrays:{$elemMatch:{keyArrays:{$elemMatch:{key:"index", key2:"index2"}}}}}) 

java写法 

Criteria criteria = Criteria.where("arrays.keyArrays").elemMatch(Criteria.where("key").is("index").and("key2").is("index1")); 

 

二、多维数组

数据：

{"arrays": [[{"key": "index"},{"key": "index1"}]]
}

 mongo语法

db.collection.find({arrays:{$elemMatch:{$elemMatch:{key:"index"}}}})

java写法 

Criteria criteria = Criteria.where("arrays").elemMatch(new Criteria().elemMatch(Criteria.where("key").is("index")));