URL url = new URL("http://example.com/api"); HttpURLConnection connection = (HttpURLConnection) url.openConnection(); connection.setRequestMethod("GET"); connection.setRequestProperty("Content-Type", "application/json"); connection.setDoOutput(true); OutputStream outputStream = connection.getOutputStream(); String requestData = "key1=value1&key2=value2"; outputStream.write(requestData.getBytes()); outputStream.flush(); InputStream inputStream = connection.getInputStream(); BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream)); String line; StringBuilder response = new StringBuilder(); while ((line = reader.readLine()) != null) { response.append(line); } reader.close(); String responseData = response.toString(); connection.disconnect();