If I do:
如果我做:
if (principal instanceof UserDetails) {
username = ((UserDetails) principal).getUsername();
}
else {
username = principal.toString();
}
if (principal instanceof UseIf I do:
如果我做:
if (principal instanceof UserDetails) {
username = ((UserDetails) principal).getUsername();
}
else {
username = principal.toString();
}
if (principal instanceof Use