This page provides sample code for creating REST clients for various popular programming languages.
-In this tutorial, we show how to create a RESTful Java client with Java built-in HTTP client library. It’s simple to use and good enough to perform basic operations for REST service.
Java client to send a “POST” request to PAGA getTransactionDetails method on the merchant restful API, with json string will be as simple as below.
package restfulclient.main; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.io.OutputStream; import java.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.URL; import java.security.MessageDigest; public class RestClient { public static void main(String[] args) { try { URL url = new URL("http://www.mypaga.com/paga-webservices/merchant-rest/getTransactionDetails"); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setRequestMethod("POST"); conn.setDoOutput(true); conn.setRequestProperty("Content-Type", "application/json"); conn.setRequestProperty("principal", "AA6EEB78-BD92-4D0B-A87D-E3DB46C53B70"); //business organization publicId conn.setRequestProperty("credentials", "password"); //business organization password StringBuilder sBuilder = new StringBuilder(); sBuilder.append("09012939283"); //referenceNumber param value sBuilder.append("0123"); //business organization api-key conn.setRequestProperty("hash", RestClientTest.hashSHA512(sBuilder.toString(), 1000, true).toString()); //input should be the data formatted as a JSON. String input = "{\"referenceNumber\":\"09012939283\"}"; OutputStream os = conn.getOutputStream(); os.write(input.getBytes()); os.close(); if (conn.getResponseCode() != 201 && conn.getResponseCode() != 200) { throw new RuntimeException("Failed : HTTP error code : " + conn.getResponseCode()); } BufferedReader br = new BufferedReader(new InputStreamReader( (conn.getInputStream()))); String output; System.out.println("Output from Server .... \n"); while ((output = br.readLine()) != null) { System.out.println(output); } conn.disconnect(); } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } //hash sha-512 with some iterations public static Object hashSHA512(String message, int iterations, boolean returnHex) { try { MessageDigest mda = MessageDigest.getInstance("SHA-512"); byte [] digest = mda.digest(message.getBytes()); for(int i = 0; i < iterations - 1; i++) { digest = mda.digest(digest); } if(returnHex) { return new String(Hex.encodeHex(digest)); } else { return digest; } } catch(Exception e) { return null; } } } |
Related articles appear here based on the labels you select. Click to edit the macro and add or change labels.
|