做demo时，报This subject is anonymous - it does not have any identifying principals and authorization operations require an identity to check against. A Subject instance will acquire these identifying principals automatically after a successful login is performed be executing org.apache.shiro.subject.Subject.login(AuthenticationToken) or when 'Remember Me' functionality is enabled by the SecurityManager. This exception can also occur when a previously logged-in Subject has logged out which makes it anonymous again. Because an identity is currently not known due to any of these conditions, authorization is denied.
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