Send POST request with JSON data Spring boot

user_13581669 0
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I trying to send a post request with json data in a particular format using Spring boot. I am not getting data in expected format. Please help e resolve it. Thanks in advance.

class UserService{
public void sendRequest(User data){
  HttpHeaders header = new HttpHeaders();
  mapHeaders.set("Content-Type","application/json");
  Map<String,User> m= new HashMap<String,User>();
  m.put("request",data);
  //print m i.e. payload being sent
  HttpEntity entity = new HttpEntity<Object>(m, header);
  String url = some url here
  ResponseEntity<Object> response = restTemplate.exchange(url, httpMethod, entity, 
   Object.class);
   }
}

class User{
private String firstName;
private String lastName;

}

While printing payload it displays payload as:

{request=User(firstName=Raj,lastName=Kumar)}

I want the data as

{request={firstName=Raj,lastName=Kumar}}
spring-boot spring-mvc rest spring java
2 Answers

You can use JSONObject :

Map<String, JSONObject> m = new HashMap<>();
m.put("request", new JSONObject(data));

Result :

{request={"firstName":"Raj","lastName":"Kumar"}}

Maven dependency :

    <dependency>
        <groupId>org.json</groupId>
        <artifactId>json</artifactId>
        <version>20210307</version>
    </dependency>
user_160384830

Do as below using Jackson library in case you need to print an object in JSON format:

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;

    ...
    m.put("request", data);
            ObjectMapper objectMapper =  new ObjectMapper();
            try {
                String jsonString = objectMapper.writeValueAsString(m);
                System.out.println(jsonString);
            } catch (JsonProcessingException e) {
                e.printStackTrace();
            }
    ...
user_81204990
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