public class GetSubSystemUrlAction extends
        AbstractJdbcUsernamePasswordAuthenticationHandler {
    
    @NotNull
    private TicketRegistry serviceTicketRegistry;

    protected Logger logger = LoggerFactory.getLogger(getClass());
    
    public void setServiceTicketRegistry(final TicketRegistry serviceTicketRegistry) {
        this.serviceTicketRegistry = serviceTicketRegistry;
    }

    public final String get(final RequestContext context,
            final Credentials credentials) throws Exception {

        if (credentials instanceof UsernamePasswordCredentials) {
            final UsernamePasswordCredentials cre = (UsernamePasswordCredentials) credentials;

            // 当前用户名
            String username = cre.getUsername();
            if (username == null) {
                String ticketGrantingTicketId = WebUtils.getTicketGrantingTicketId(context);
                System.out.println("------tgt:-----------" + ticketGrantingTicketId);
                
                final TicketGrantingTicket ticketGrantingTicket;
                ticketGrantingTicket = (TicketGrantingTicket) this.serviceTicketRegistry.getTicket(ticketGrantingTicketId, TicketGrantingTicket.class);
                System.out.println("------tgt2:-----------" +ticketGrantingTicket);
                
                if(ticketGrantingTicket==null){
                    System.out.println("------to login:-----------");
                    return "error";
                }
                final List<Authentication> chainedAuthenticationsList = ticketGrantingTicket.getChainedAuthentications();
                final Authentication authentication = chainedAuthenticationsList.get(chainedAuthenticationsList.size() - 1);
                final Principal principal = authentication.getPrincipal();
                
                username = principal.getId();
            }
            context.getRequestScope().put("username", username);