CODEWITHSUNDEEP
javajsonspring-bootrequesthttp-post
Pkumar
Pkumar

Reputation: 177

How to check if the request body is empty or request body have empty fields in simple way?

Hi I have the controller which accepts the POST request.

The request body can be empty or with body with null fields : i.e. or { }

@RestController
public class UserController {
    @Autowired
    private UserService UserService;
    @RequestMapping(value = "/tree", method = POST,consumes = MediaType.APPLICATION_JSON_VALUE)
    public List<ResponseUser> controller(@RequestBody(required=false) UserDataRequest request) {
        return UserService.send(request);
    }
}

I have service defined as follows :

  1. To check if the body is empty ie null
  2. To check if the field is null one by one
  3. If the fields are null then do step 1 again
@Service
public class UserService {

    @Autowired
    private RestTemplate restTemplate;

    private ResponseEntity<List<ResponseUser>> responseEntity;

    public List<ResponseUser> send(UserDataRequest data){


        //empty body == null
    if(data == null ) {
           // return list1 of type ResponseUser
        }
    else{

       //Check for the fields are present are not
        Optional<String> id = Optional.ofNullable(data.getid());
        Optional<String> search = Optional.ofNullable(data.getsearch());

        //if id is present 
        if (id.isPresent()) {
            // return list2 of type ResponseUser

        }

        //if search is present 
        else if(search.isPresent()){
        // return list3 of type ResponseUser

            }

        else {
        // return list1 of type ResponseUser
        }
    }
    return responseEntity.getBody();
    }
}

I would like to know how to not repeat same thing again? Is there any efficient way?

Upvotes: 1

Views: 8656

Answers (2)

Oleh Tatsiun
Oleh Tatsiun

Reputation: 919

Answer to @Pkumar

If fields: search, id are String values:

if (data == null || !StringUtils.hasText(data.getsearch())) {
   // return list1 of type ResponseUser
}

if (!StringUtils.hasText(data.getid())) {
   // return list2 of type ResponseUser
}

if (!StringUtils.hasText(data.getsearch())) {
   // return list3 of type ResponseUser
}

Answer in general if you want to check request is empty:

if (request == null) {
   // your logic here
}

Upvotes: 0

Kabiru Ahmed
Kabiru Ahmed

Reputation: 324

Add Validation annotation to your Pojo class

public class UserDataRequest {
@NotNull
private String id;

@NotNull
private String search;
}

update your post method to use this validation

 public List<ResponseUser> send(@Valid UserDataRequest data){}

Upvotes: 2

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