I have a model that looks like this:

@Data
public class RegistrationRequestDto {

    public final String email;
    public final String username;
    public final String password;
    public final String confirmPassword;
    public final String firstName;
    public final String lastName;
    public final String keycloakId;

    public RegistrationRequestDto(
            String email,
            String username,
            String password,
            String confirmPassword,
            String firstName,
            String lastName,
            String keycloakId) {
        notNull(email, "email must be set");
        notNull(username, "username must be set");
        notNull(password, "password must be set");
        notNull(firstName, "firstName must be set");
        notNull(lastName, "lastName must be set");
        this.email = email;
        this.username = username;
        this.password = password;
        this.confirmPassword = confirmPassword;
        this.firstName = firstName;
        this.lastName = lastName;
        this.keycloakId = keycloakId;
    }
}

Next, I have a method that is calling another service with restTempate.

The result of that call I should save in the model shown above.

I have this piece of code that should call and return result from external service:

RegistrationRequestDto userProfile = new RegistrationRequestDto();
        try {
            HttpHeaders httpHeaders = new HttpHeaders();
            httpHeaders.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
            // httpHeaders.set("Authorization", "Bearer "   responseToken.getAccess_token());
            HttpEntity<String> request = new HttpEntity<String>(httpHeaders);

            ResponseEntity<Object> result = restTemplate.exchange(uri, HttpMethod.POST, request, Object.class);
            log.info("{}", result);
            log.info("{}", result.getBody());

            LinkedHashMap<String, Object> map = (LinkedHashMap<String, Object>) result.getBody();

            if (map != null) {
                userProfile.setUserId(map.get("sub").toString());
                userProfile.setGiven_name(map.get("given_name").toString());
                userProfile.setFamily_name(map.get("family_name").toString());
                userProfile.setEmail(map.get("email").toString());
                userProfile.setEmail_verified(map.get("email_verified").toString());
                //userProfile.setPhoto(Optional.ofNullable(map.get("photo").toString()));
            }
    
        } catch (Exception e) {
            e.printStackTrace();
        }
        return userProfile;

So, in this code I am using

if (map != null) {
   userProfile.setUserId(map.get("sub").toString());
   userProfile.setGiven_name(map.get("given_name").toString());
   userProfile.setFamily_name(map.get("family_name").toString());
   userProfile.setEmail(map.get("email").toString());
   userProfile.setEmail_verified(map.get("email_verified").toString());
}

Which I was able to use when variables in RegistrationRequestDto model were just private.

But now as variables are public final I am not sure how to store result in map?

CodePudding user response：

You can create the Pojo as per the response returned from the api.

i.e If you have some api https://www.mockapis.not/users/user/123 and it return the response something like this,

{
   "name":"stack",
   "age":21,
   "phone":123456789,
   "dob":"01-06-2011"
}

Then you can create a java class with the given properties.

class User {
    private String name;
    private int age;
    private long phone;
    private Date dob;

    //getter setter or lombok @Data or @Getter @Setter
}

Then you can call your api as below and you can get User object from the response entity.

RestTemplate restTemplate = new RestTemplate();
ResponseEntity<User> response = restTemplate.exchange(apiUrl, HttpMethod.GET, User.class);
User user = response.getBody();

Now you don't need to parse the object. It will be parsed by automatically.

For more details you can visit Resttemplate

CodePudding user response：

Your dto class must have a fasterxml @JsonCreator on its constructor. something like below dto:

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import lombok.Value;

@Value
public class User {
    public final int id;
    public final String name;

    @JsonCreator(mode = JsonCreator.Mode.PROPERTIES)
    public User(@JsonProperty("id") int id, @JsonProperty("name") String name) {
        this.id = id;
        this.name = name;
    }

}

And in the rest call pass User.class instead of Object.class. Something like below:

ResponseEntity<User> response = restTemplate.exchange(uri, HttpMethod.GET, HttpEntity.EMPTY, User.class);

User user = response.getBody();

Note: @JsonProperty("...") is necessary here. Also @Value is better for your use case than @Data.