Call a third party API from Spring Web Application

 To call a third-party API from a Spring web application, you can use various methods depending on your requirements and preferences. Here are a few common approaches:

  • Using RestTemplate: RestTemplate is a synchronous HTTP client provided by Spring, which simplifies consuming RESTful services. You can use RestTemplate to make HTTP requests to the third-party API and handle the responses in your Spring application.

           Example:


            RestTemplate restTemplate = new RestTemplate();
            ResponseEntity<String> response = restTemplate.getForEntity("https://api.example.com/data",                     String.class);
            String responseBody = response.getBody();
            // Process the response

  • Using WebClient: WebClient is a non-blocking, reactive HTTP client introduced in Spring WebFlux. It is suitable for asynchronous and reactive programming styles. You can use WebClient to make HTTP requests to the third-party API and process the responses asynchronously.

            Example:


            WebClient webClient = WebClient.create();             webClient.get()             . uri("https://api.example.com/data")             .retrieve()             .bodyToMono(String.class)             .subscribe(responseBody -> {             // Process the response asynchronously             });


  • Using Apache HttpClient: If you prefer low-level control over HTTP requests, you can use Apache HttpClient directly. It provides more flexibility and customization options compared to RestTemplate or WebClient, but requires more manual configuration.

           Example:


           CloseableHttpClient httpClient = HttpClients.createDefault();            HttpGet httpGet = new HttpGet("https://api.example.com/data");            CloseableHttpResponse response = httpClient.execute(httpGet);            String responseBody = EntityUtils.toString(response.getEntity());            // Process the response


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