[FIXED] How to limit the size of a Key in a Json response in spring boot?

Issue

image This is my JSON repsonse, there is an attribute (key) in the response named as DATA which is list of lists and have 1000+ list in it.

I want to limit the size of data(attribute inside json) to 30 lists and 90 lists for two different controllers. I am not able to find out how to do it.

Solution

Extract business logic to a @Service class, and provide the required limit as a parameter from a Controller:

@Service
public class MyService {

  MyDto createResponse(int limit) {
    //.... slice list size, e.g.
    List limitedData = data.subList(0, limit);
    //...
  }
}


@RestController
public class MyController1 {

  @Autowired
  MyService myService;

  MyDto createResponse() {
    return myService.createResponse(30);
  }
}



@Controller
public class MyController2 {

  @Autowired
  MyService myService;

  MyDto createResponse() {
    return myService.createResponse(100);
  }
}

Answered By - Marc Stroebel
Answer Checked By - Candace Johnson (JavaFixing Volunteer)