IBM ：扩展JAAS实现类实例级授权
http://www.ibm.com/developerworks/cn/java/j-jaas/
天极：JAAS:灵活的Java安全机制
http://www.yesky.com/SoftChannel/72342371961929728/20030114/1648365.shtml
JAAS 基础认证和授权机制
http://www.360doc.com/showweb/0/0/285321.aspx
java Authentication and Authorization Service (JAAS)
http://java.sun.com/javase/6/docs/technotes/guides/security/
