SpringSecurity LogoutSuccessHandler空指针问题

1.自定义LogoutSuccessHandler实现类

@Slf4j
@Component
public class UserLogoutSuccessHandler implements LogoutSuccessHandler {
    @Override
    public void onLogoutSuccess(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Authentication authentication) throws IOException, ServletException {
        SecurityUser user = (SecurityUser) authentication.getPrincipal();
        String username = user.getUsername();
        log.info("用户: {}  注销登录成功", username);
        ResponseUtil.write(httpServletResponse, JsonResult.ok("退出成功"));
    }
}

2. SecurityConfig中添加了logoutSuccessHandler

.and().logout().logoutSuccessHandler(userLogoutSuccessHandler)

3.发现UserLogoutSuccessHandler中authentication为null，我想拿到用户信息保存日志，有朋友知道怎么解决吗？

https://www.jb51.net/article/225431.htm