JAAS 例子代码，包括如何实现Kerberos Login，执行Action，以及实现Kerberos Delegation.-JAAS example code, including how to achieve the Kerberos Login, the implementation of Action, as well as Kerberos Delegation.

JAAS简单实现登陆功能,eclipse下测试可运行-Simple implementation of JAAS login function, eclipse the test run