Spring Security Remember Me – 春天的安全 记住我

最后修改: 2013年 8月 1日

1. Overview


This tutorial will show how to enable and configure Remember Me functionality in a web application with Spring Security. Setting up the MVC application with security and a simple form login has already been discussed.

本教程将展示如何使用Spring Security在Web应用程序中启用和配置Remember Me功能。前面已经讨论了设置具有安全性的MVC应用程序和简单的表单登录

The mechanism will be able to identify the user across multiple sessions – so the first thing to understand is that Remember Me only kicks in after the session times out. By default, this happens after 30 minutes of inactivity, but timeout can be configured in the web.xml.


Note: this tutorial focuses on the standard cookie-based approach. For the persistent approach, have a look at the Spring Security – Persistent Remember Me guide.

注意:本教程侧重于基于cookie的标准方法。对于持久性方法,请查看Spring Security – Persistent Remember Me指南。

2. The Security Configuration


Let’s see how to set up the security configuration using Java:


public class SecSecurityConfig {

    public AuthenticationManager authenticationManager(HttpSecurity http) throws Exception {
        return http.getSharedObject(AuthenticationManagerBuilder.class)

    public InMemoryUserDetailsManager userDetailsService() {
        UserDetails user = User.withUsername("user1")
        UserDetails admin = User.withUsername("admin1")
        return new InMemoryUserDetailsManager(user, admin);

    public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
        return http.build();

As you can see, the basic configuration using the rememberMe() method is extremely simple while remaining very flexible through additional options. The key is important here – it is a private value secret for the entire application and it will be used when generating the contents of the token.


Additionally, the time the token is valid can be configured from the default of 2 weeks to – for example – one day using tokenValiditySeconds():



We can also have a look at the equivalent XML configuration:


<http use-expressions="true">
    <intercept-url pattern="/anonymous*" access="isAnonymous()" />
    <intercept-url pattern="/login*" access="permitAll" />
    <intercept-url pattern="/**" access="isAuthenticated()" />

    <form-login login-page='/login.html' 
      authentication-failure-url="/login.html?error=true" />
    <logout delete-cookies="JSESSIONID" />

    <remember-me key="uniqueAndSecret"/>

<authentication-manager id="authenticationManager">
            <user name="user1" password="{noop}user1Pass" authorities="ROLE_USER" />
            <user name="admin1" password="{noop}admin1Pass" authorities="ROLE_ADMIN" />

3. The Login Form


The login form is similar to the one we used for form login:




    <form name='f' action="login" method='POST'>
                <td><input type='text' name='username' value=''></td>
                <td><input type='password' name='password' /></td>
                <td>Remember Me:</td>
                <td><input type="checkbox" name="remember-me" /></td>
                <td><input name="submit" type="submit" value="submit" /></td>


Notice the newly added checkbox input – mapping to remember-me. This added input is enough to log in with remember me active.


This default path can also be changed as follows:



4. The Cookie


The mechanism will create an additional cookie – the “remember-me” cookie – when the user logs in.

该机制将在用户登录时创建一个额外的cookie–“记住我 “cookie。

The Remember Me cookie contains the following data:

Remember Me cookie包含以下数据。

  • username – to identify the logged-in principal
  • expirationTime – to expire the cookie; default is 2 weeks
  • MD5 hash – of the previous 2 values – username and expirationTime, plus the password and the predefined key

The first thing to notice here is that both the username and the password are part of the cookie – this means that, if either is changed, the cookie is no longer valid. Also, the username can be read from the cookie.


Additionally, it is important to understand that this mechanism is potentially vulnerable if the remember me cookie is captured. The cookie will be valid and usable until it expires or the credentials are changed.


5. In Practice


To easily see the remember me mechanism working, you can:


  • log in with remember me active
  • wait for the session to expire (or remove the JSESSIONID cookie in the browser)
  • refresh the page

Without remember me active, after the cookie expires the user should be redirected back to the login page. With remember me, the user now stays logged in with the help of the new token/cookie.

如果没有激活 “记住我”,在cookie过期后,用户应该被重新引导到登录页面。在记住我的情况下,用户现在在新令牌/cookie的帮助下保持登录状态

6. Conclusion


This tutorial showed how to set up and configure Remember Me functionality in the security configuration, and briefly described what kind of data goes into the cookie.

本教程展示了如何在安全配置中设置和配置 “记住我 “功能,并简要介绍了什么样的数据会进入cookie。

The implementation can be found in the example Github project – this is an Eclipse-based project, so it should be easy to import and run as it is.

可以在Github 示例项目中找到该实现 – 这是一个基于 Eclipse 的项目,因此应该很容易导入并按原样运行。

When the project runs locally, the login.html can be accessed on localhost.