About Customizing view [casGenericSuccess .jsp] by cas3.0

[johnhzjx]

Hello,
  i'm newer for CAS. 
  when i use CAS3.0,I deploy some Appliaction on the CAS, and now the customer need a login page like this:
 After customer land, judge the customer to own first which systems of legal power, 
then display the chain that corresponds the system for customer to connect, 
but others do not display
  so i first customizing view casLoginView.jsp like a portal login page, then when user login success redirect to [casGenericSuccess.jsp](a user attempts to login without coming directly from a service), i just want to customizing casGenericSuccess.jsp use a CheckUserLegalPower javabean. this bean just check UserLegalPower by user login id..but now i dont't know how can i get user login ID in casGenericSuccess.jsp? 
 
ps:My English level is very bad, if have where have the mistake, please forgive.Thanks
                                                                               
                                                                      cloud 
                                                                      
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