Call another rest api from my server in Spring-Boot

Question

I want to call another web-api from my backend on a specific request of user. For example, I want to call Google FCM send message api to send a message to a specific user on an event.

Does Retrofit have any method to achieve this? If not, how I can do that?

Answer 1

This website has some nice examples for using spring's RestTemplate. Here is a code example of how it can work to get a simple object:

private static void getEmployees() {     final String uri = "http://localhost:8080/springrestexample/employees.xml";      RestTemplate restTemplate = new RestTemplate();     String result = restTemplate.getForObject(uri, String.class);      System.out.println(result); } 

Answer 2

Modern Spring 5+ answer using WebClient instead of RestTemplate.

Configure WebClient for a specific web-service or resource as a bean (additional properties can be configured).

@Bean public WebClient localApiClient() {     return WebClient.create("http://localhost:8080/api/v3"); } 

Inject and use the bean from your service(s).

@Service public class UserService {      private static final Duration REQUEST_TIMEOUT = Duration.ofSeconds(3);      private final WebClient localApiClient;      @Autowired     public UserService(WebClient localApiClient) {         this.localApiClient = localApiClient;     }      public User getUser(long id) {         return localApiClient                 .get()                 .uri("/users/" + id)                 .retrieve()                 .bodyToMono(User.class)                 .block(REQUEST_TIMEOUT);     }  }