如何在 java spring 引导中对 json 数组的两个值求和？

Question

My Api response(for the url http://localhost:8080/findTotSum/12-01-2020/12-02-2020) in JSON format is this

[ { "id": 121982, "expdate": null, "exptype": null, "expamt": 1000 }, { "id": 121984, "expdate": null, "exptype": null, "expamt": 54 } ]

I want to sum both the expamt and should get the result as 1054 and should give the response with summed up amount alone if possible

Answer 1

At first you should update API for /findTotSum endpoint according to your buisness logic. If you want to get the sum of several values you should choose correct return type.

Second, you need to implement a service for such operations, in this case for sum operation, and use it controller class.

The response can be changed for something like that:

Class newResponseWithSum { 
  private List<SomeEntity> list;
  private int sum;
}