java 中的 Mongodb，如何在聚合 function 中使用日期范围

Question

I have the following code for filtering based on sex and then grouping based on employee_id, along with an extra field that does the sum for total of days.

    collection.aggregate(
            Arrays.asList(
                    Aggregates.match(Filters.eq("$sex","male")),
              Aggregates.group("$employee_id", sum("total", "$days")),

            )
    ).forEach(printBlock);

In this query how do I add a date range to match for example - greater than (some date) and less than (some date). Also which would be the right format of date to use like in java.util.Date or something else. I found similar questions but nothing in 2020 where there may be an updated part for doing this in an easier way. Also would there be a way to generate a query without this format and just filter by date range and group by some value.

     the json example

                  {
                    "employee_id": "GX078333",
                    "sex": "male",
                    "days": 5,
                    "date": {
                              "$date": "2020-06-01T07:33:50.796Z"
                    },
                    }

Answer 1

You can match multiple values using Filters.and(Bson, Bson, ...) or Filters.and(List<Bson>) Reference

I hope you know that date must be an array/list of dates.

So, to provide an Example. cDateRang is an ArrayList with your Dates which should match.

eg

ArrayList<Date> cDateRange = new ArrayList<>();
cQueryFields.add(Filters.in("date.mydatearray", cDateRange));

//
Bson cQuery = Filters.and(cQueryFields);

//
ArrayList<Bson> cQueryList = new ArrayList<>();
cQueryList.add(Aggregates.match(cQuery));

//
cQueryList.add(Aggregates.match(cQuery));
AggregateIterable<Document> cResult = cMongoDatabase.getCollection("your collection Name").aggregate(pFilter)