Call another rest api from my server in Spring-Boot

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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?

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);
}

Getting Started, The Initalizr creates a class with a main() method. args) { SpringApplication.run​(ConsumingRestApplication.class, args); } } Copy SpringBootApplication; import org.springframework.boot.web.client. According to wikipedia, Representational state transfer (REST) or RESTful Web services are one way of providing interoperability between computer systems on the Internet. With RestTemplate class we can make any REST calls to different applications. In this blog we are going to discuss about 4 main HTTP request these are GET, POST, PUT, DELETE.

Instead of String you are trying to get custom POJO object details as output by calling another API/URI, try the this solution. I hope it will be clear and helpful for how to use RestTemplate also,

In Spring Boot, first we need to create Bean for RestTemplate under the @Configuration annotated class. You can even write a separate class and annotate with @Configuration like below.

@Configuration
public class RestTemplateConfig {

    @Bean
    public RestTemplate restTemplate(RestTemplateBuilder builder) {
       return builder.build();
    }
}

Then, you have to define RestTemplate with @Autowired or @Injected under your service/Controller, whereever you are trying to use RestTemplate. Use the below code,

@Autowired
private RestTemplate restTemplate;

Now, will see the part of how to call another api from my application using above created RestTemplate. For this we can use multiple methods like execute(), getForEntity(), getForObject() and etc. Here I am placing the code with example of execute(). I have even tried other two, I faced problem of converting returned LinkedHashMap into expected POJO object. The below, execute() method solved my problem.

ResponseEntity<List<POJO>> responseEntity = restTemplate.exchange(
    URL, 
    HttpMethod.GET, 
    null, 
    new ParameterizedTypeReference<List<POJO>>() {
    });
List<POJO> pojoObjList = responseEntity.getBody();

Happy Coding :)

11 Using RestTemplate to call an external microservice API, Let's see the sequence of how one microservice calls another microservice using Call the Rest Endpoint: After resolving the IP address using Spring create this module and call the Employee Search service via Eureka server to get Employee information. import org.springframework.boot.web.client. How to consume REST based web service in Spring BOOT Introduction. Create a REST Template Bean. Consuming a service by HTTP GET method. Consuming a service by HTTP POST method. Using postForObject. Using postForEntity. Add the URL in application.yml YAML/properties file. Maven Dependencies.

Create Bean for Rest Template to auto wiring the Rest Template object.

@SpringBootApplication
public class ChatAppApplication {

    @Bean
    public RestTemplate getRestTemplate(){
        return new RestTemplate();
    }

    public static void main(String[] args) {
        SpringApplication.run(ChatAppApplication.class, args);
    }

}

Consume the GET/POST API by using RestTemplate - exchange() method. Below is for the post api which is defined in the controller.

@RequestMapping(value = "/postdata",method = RequestMethod.POST)
    public String PostData(){

       return "{\n" +
               "   \"value\":\"4\",\n" +
               "   \"name\":\"David\"\n" +
               "}";
    }

    @RequestMapping(value = "/post")
    public String getPostResponse(){
        HttpHeaders headers=new HttpHeaders();
        headers.setAccept(Arrays.asList(MediaType.APPLICATION_JSON));
        HttpEntity<String> entity=new HttpEntity<String>(headers);
        return restTemplate.exchange("http://localhost:8080/postdata",HttpMethod.POST,entity,String.class).getBody();
    }

Refer this tutorial[1]

[1] https://www.tutorialspoint.com/spring_boot/spring_boot_rest_template.htm

Microservices Communication: Service to Service, This is going to setup the REST server configuration in the applicationContext big data ,database ,integration ,resttemplate ,spring ,spring boot ,tutorial So you can pick any client, any server, any network, we can run on a  How to call https rest webservice in spring boot

How to Use Spring RESTTemplate to Post Data to a Web Service , By Lokesh Gupta | Filed Under: Spring Boot RestTemplate Given that the RestTemplate class is designed to call REST services, It should come as no surprise I am trying to call a third party api gateway from my server using RestTemplate. calling rest api in spring. Just for making sure if the problem is on the server or client side. Please find my solution for calling REST web-services in

How to consume REST based web service in Spring BOOT, Spring Boot Restful Client with RestTemplate Example. class in Spring Framework for the synchronous calls by the client to access a REST web-service. The spring-boot-starter-data-rest includes libraries to work with Spring RESTful​. Deploying Spring Boot Application on Tomcat Server · Deploying Spring Boot​  After learning to build Spring REST API for XML representation and JSON representation, let’s build Spring REST client to consume APIs which we have written in linked examples. 1. RestTemplate class. Accessing a third-party REST service inside a Spring application revolves around the use of the Spring RestTemplate class.

Spring RestTemplate - Spring REST Client Example, Learn how to make server-side HTTP calls using WebClient and RestTemplate. course, focused on the fundamentals of Spring 5 and Spring Boot 2: Under the hood, RestTemplate uses the Java Servlet API, which is Their task is to call another slow REST web service, which returns a list of tweets. A more useful way to consume a REST web service is programmatically. To help you with that task, Spring provides a convenient template class called RestTemplate. RestTemplate makes interacting with most RESTful services a one-line incantation. And it can even bind that data to custom domain types. First,

Comments
  • You don't need a third-party library. Spring already has the RestTemplate
  • Questions tagged [resttemplate]
  • RestTemplate will be deprecated in a future version, use the more modern alternative WebClient
  • Object result = restTemplate.getForObject(uri, Object .class); - to be more generic
  • @Muhammad Faizan Uddin I thought about it, but iirc that might now work if the Object can not be serialized properly for any reason; while the string approach always works because JSON can always be serialized into a string.
  • RestTemplate will be deprecated in a future version, use the more modern alternative WebClient