引入依赖
<dependency>
<groupId>org.thymeleaf.extras</groupId>
<artifactId>thymeleaf-extras-springsecurity5</artifactId>
<version>3.0.4.RELEASE</version>
</dependency>页面加入命名空间
<html lang="en" xmlns:th="https://www.thymeleaf.org"
xmlns:sec="http://www.thymeleaf.org/extras/spring-security">页面中使用
<!--获取认证用户名-->
<ul>
<li sec:authentication="principal.username"></li>
<li sec:authentication="principal.authorities"></li>
<li sec:authentication="principal.accountNonExpired"></li>
<li sec:authentication="principal.accountNonLocked"></li>
<li sec:authentication="principal.credentialsNonExpired"></li>
</ul>
