Security重写权限服务配置类

@Service
public class MyUserDetailService implements UserDetailsService {
    @Autowired
    private UserInfoDao dao;
    @Override
    public UserDetails loadUserByUsername(String s) throws UsernameNotFoundException {
        User user = null;
        UserInfo userInfo = null;
        if (s != null){
            userInfo = dao.findByUserName(s);
           if( userInfo != null)
           {
               ArrayList<GrantedAuthority> list = new ArrayList<>();
               //角色必须以ROLE_开头
               list.add(new SimpleGrantedAuthority("ROLE_" + userInfo.getRole()));
               //创建user对象
               user = new User(userInfo.getUserName(),userInfo.getPassword(),list);
           }else{
               throw new UsernameNotFoundException("错误");
           }
        }else{
            throw new UsernameNotFoundException("错误");
        }
        return user;
    }
}