final String alfrescoUrl = "http://my-alfresco-host";

final String alfrescoUser = "alfresco-user";

final String alfrescoPass = "alfresco-password";

private void makeSomeStuff() {

    Credentials credentials = new Credentials(alfrescoUser, alfrescoPass);

    // Create AuthService which logins and logouts in Alfresco
    AuthService authService = new AuthService(alfrescoUrl, credentials);

    AuthResponse authResponse = authService.login();
    String token = authResponse.getAuthenticationData().getAuthenticationToken();

    // Let's get node content with our token
    String filePath = "workspace://SpacesStore/6cffe1dd-d4aa-4770-b371-7c9b4c808cc9";
    AlfrescoUtils.AlfrescoStorePath alfPath = AlfrescoUtils.extractPath(filePath);

    DocumentContent nodeContent = new ContentService(alfrescoUrl, token)
        .getNodeContent(alfPath.storeType, alfPath.storeId, alfPath.nodeId);
    
    // so easy!
}