Spring Security - How to Get Current Logged-In Username in Themeleaf

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In this short article, I show you how to get a current logged-in username in Themeleaf using Spring Security.
Thymeleaf is a modern, server-side web templating engine, with good integration with the Spring MVC framework. Let’s see how to access the currently authenticated principal on a page with the Thymeleaf engine.

How to Get Current Logged-In Username in Themeleaf using Spring Security

First, we need to add the thymeleaf-spring5 and the thymeleaf-extras-springsecurity5 dependencies to integrate Thymeleaf with Spring Security:
<dependency>
    <groupId>org.thymeleaf.extras</groupId>
    <artifactId>thymeleaf-extras-springsecurity5</artifactId>
</dependency>
<dependency>
    <groupId>org.thymeleaf</groupId>
    <artifactId>thymeleaf-spring5</artifactId>
</dependency>
Now we can refer to the principal in the HTML page using the sec:authorize attribute:
<html xmlns:th="https://www.thymeleaf.org"
  xmlns:sec="https://www.thymeleaf.org/thymeleaf-extras-springsecurity5">
<body>
    <div sec:authorize="isAuthenticated()">Authenticated as <span sec:authentication="name"></span></div>
</body>
</html>
In the above code, The sec:authorize attribute renders an element’s content when its expression evaluates to true. The sec:authentication attribute gets the currently logged-in principle or user name.

Related Spring Security Tutorials/Guides:

Core Components of Spring Security Spring Security: Authentication Spring Security: Authorization Spring Security: Principal Spring Security: Granted Authority Spring Security: SecurityContextHolder Spring Security: UserDetailsService Spring Security: Authentication Manager Spring Security: Authentication Provider Spring Security: Password Encoder AuthenticationEntryPoint in Spring Security @PreAuthorize Annotation in Spring Security Spring Security Basic Authentication Spring Security In-Memory Authentication Spring Security Form-Based Authentication Difference Between Basic Authentication and Form Based Authentication Spring Security Custom Login Page Spring Security Login Form Example with Database Authentication Spring Boot Login REST API Login and Registration REST API using Spring Boot, Spring Security, Hibernate, and MySQL Database Spring Boot + Spring Security + Angular Example Tutorial Spring Boot + Angular Login Authentication, Logout, and HttpInterceptor Example Spring Security In-Memory Authentication Example Spring Security Hibernate Database Authentication - UserDetailsService Securing a Spring MVC Application with Spring Security Spring Boot Security Login REST API Example Spring Boot Security Login and Registration REST API Role-based Authorization using Spring Boot and Spring Security Spring Boot Security JWT Token-Based Authentication and Role-Based Authorization Tutorial Spring Boot + Spring Security + JWT + MySQL Database Tutorial Spring Boot JWT Authentication and Authorization Example Spring Boot Security JWT Example - Login REST API with JWT Authentication Spring Boot Security JWT Token-Based Authentication and Role-Based Authorization Tutorial Spring Security - Get Current Logged-In User Details Spring Security - How to Get Current Logged-In Username in JSP Spring Security - How to Access User Roles in JSP Spring Security - How to Get Current Logged-In Username in Themeleaf Spring Security Tutorial - Registration, Login, and Logout Spring Boot 2 + Spring MVC + Role-Based Spring Security + JPA + Thymeleaf + MySQL Tutorial User Registration Module using Spring Boot 2 + Spring MVC + Spring Security + Hibernate 5 + Thymeleaf + MySQL Registration and Login using Spring Boot, Spring Security, Spring Data JPA, Hibernate, H2, JSP, and Bootstrap Spring Boot User Registration and Login Example Tutorial

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