Comment faire appel à un service REST avec java

j'ai fini par réussir

Voilà ce que donne le code finale :

Code:

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 try {
 
            URL url = new URL("https://www.siteUrl.fr/api/merchant/createOrder");
            URLConnection con = url.openConnection();
            HttpURLConnection http = (HttpURLConnection)con;
            http.setRequestMethod("POST"); // PUT is another valid option
            http.setDoOutput(true);
 
            String var= "transxx15";
            // form params
            byte[] out = ("transactionId="+var+"&idSite=125487&okUrl=https://www.my-site.fr/lpc-ok&koUrl=https://www.my-site.fr/lpc-ok&notificationUrl=https://www.my-site.fr/lpc-ok&amount=100&currency=EUR").getBytes(StandardCharsets.UTF_8);
            int length = out.length;
 
            http.setFixedLengthStreamingMode(length);
            // Header
            http.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
            http.setRequestProperty("idUtilisateur", "HBNKJOJSD781");
            http.connect();
            try(OutputStream os = http.getOutputStream()) {
                os.write(out);
            }
 
            // This line makes the request
            InputStream responseStream = http.getInputStream();
 
            // Manually converting the response body InputStream to APOD using Jackson
            ObjectMapper mapper = new ObjectMapper();
            MerchantResponse apod = mapper.readValue(responseStream, MerchantResponse.class);
 
            // Finally we have the response
            System.out.println(apod.getTransactionId());
 
 
        } catch (final Exception e) {
 
        }

Et voici un lien vers une page qui m'a beaucoup aidé : https://www.twilio.com/blog/5-ways-t...quests-in-java