A treelike and little granularity-oriented RBAC,i. e,tg-RBAC,is presented to study this item,tg-RBAC is evolved from the RBAC,and a J2EE-based organized and realized model is given,too.

• 为了解决这一问题,在此,提出了一种树状细粒度RBAC模型(treelike and little granularity-oriented RBAC,tg-RBAC),该模型是从RBAC模型演化而来的。