Is there a packaged function in Mongo java driver that can directly fetch a specific value in a document instead of a document? Or is there a way to do this? ?

  mongodb, question

{“_id”:”37389873″,
“Date”:{
“name”:{“count”:”7″,
“user”: “liyang”,
}

}

}

For example, for this document stored in the database, I want to take the value of 7 in count, only take the number 7, and do not need the document. how do I implement it instead? ?

Finally, I converted the json string into a map using jackson, then stripped it layer by layer using the map, and finally returned a value

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