Build a HttpMethod POST request with array of object from dto

Question

I need to send an array of object as request body to POST API which looks like below.

[{
 "k1": "v1",
 "k2": "v2",
 "k3": 1
  }]

my dto file looks like below

public class Request {

    @JsonProperty("k1")
    private String k1;

    @JsonProperty("k2")
    private String k2;

    @JsonProperty("k3")
    private int k3;

    //setters and getters

    //override toString
    public String toString() {
        Gson gson = new GsonBuilder().setPrettyPrinting().create();
        return gson.toJson(this);
    }

}

my client implementation looks like below

final HttpEntity<Request> httpEntity = new HttpEntity<Request>(requestBody, headers);

final ResponseEntity<String> responseEntity = restTemplate.exchange(URI, HttpMethod.POST, httpEntity, String.class);

Now i need help to build requestBody

being a JS dev , i am fairly new to Java. so, please be kind. ThankYou.

Answer 1

mentioned JSON

[{
 "k1": "v1",
 "k2": "v2",
 "k3": 1
  }]

is a list of Request Object. So this requestBody object must be like -

List<Request> requestBody = //your logic to build this variable;

Change in httpEntity to accept this request body:

final HttpEntity<List<Request>> httpEntity = new HttpEntity<List<Request>>(requestBody, headers);

UPDATED: Example to build requestBody variable:

Request request1 = new Request("v1", "v2", 1);

List<Request> requestBody = new ArrayList<>();
requestBody.add(request1);