Salesforce에서 데이터를 쿼리, 생성, 업데이트, 삭제하기

    public static String call(HttpRequestBase req) {
        String result = null;
        try {
            HttpClient client = HttpClientBuilder.create().build();
            HttpResponse response = null;
            try {
                response = client.execute(req);
                System.out.println(response.getStatusLine());
            } catch(UnsupportedEncodingException ueException){
                ueException.printStackTrace();
            } catch(ClientProtocolException cpException){
                cpException.printStackTrace();
            } catch(IOException ioException){
                ioException.printStackTrace();
            }

            final int statusCode = response.getStatusLine().getStatusCode();
            try {
                if (statusCode == HttpStatus.SC_OK || statusCode == HttpStatus.SC_CREATED) {
                    result = EntityUtils.toString(response.getEntity());
                } else if(statusCode == HttpStatus.SC_NO_CONTENT) {
                    result = "{\"result\":\"success\"}";
                } else {
                    System.out.println("Error authenticating to Force.com: "+statusCode);
                    System.out.println(response.toString());
                    return null;    
                }
    
            } catch (IOException ioException) {
                ioException.printStackTrace();
            }

        } catch (Exception e) {
            System.out.println(e);
        }

        return result;
    }