DocuSign API Authorization Code Grant Sample in demo (sandbox) environment.

GetAuthorizationCode.java

// integrator keys are created through developer sandbox accounts then migrated
// to your production account when ready. Note that your integrator key also acts
// as your client ID during oauth requests
String IntegratorKey = "{integratorKey}";

// generate a client secret for the integrator key you supply above, again through sandbox admin menu
String ClientSecret = "{clientSecret}";

// must match a redirect URI (case-sensitive) you configured on the key
String RedirectURI = "https://yourapp.com/callback";

// use demo authentication server (remove -d for production)
String AuthServerUrl = "https://account-d.docusign.com";

// point to the demo (sandbox) environment. For production requests your account sub-domain 
// will vary, you should always use the base URI that is returned from authentication to
// ensure your integration points to the correct endpoints (in both environments)
String RestApiUrl = "https://demo.docusign.net/restapi";

// instantiate the api client and point to auth server
ApiClient apiClient = new ApiClient(AuthServerUrl, "docusignAccessCode", IntegratorKey, ClientSecret);

// set the base path for REST API requests
apiClient.setBasePath(RestApiUrl);

// configure the authorization flow on the api client
apiClient.configureAuthorizationFlow(IntegratorKey, ClientSecret, RedirectURI);

// set as default api client in your configuration
Configuration.setDefaultApiClient(apiClient);

try {
	// get DocuSign OAuth authorization url
	String oauthLoginUrl = apiClient.getAuthorizationUri();
	// open DocuSign OAuth login in the browser
	System.out.println(oauthLoginUrl);
	Desktop.getDesktop().browse(URI.create(oauthLoginUrl));
}
catch (OAuthSystemException ex)
{
  System.out.println(ex);
}