How do you implement login/logout functionality?
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Implementing login/logout functionality involves validating user credentials, managing sessions/tokens, and ensuring secure logout. In Spring Boot + Spring Security, it is done as follows:
1. User Authentication (Login)
User submits username & password via form.
Credentials are verified against a database (using UserDetailsService and PasswordEncoder).
If valid → Spring Security creates a SecurityContext and stores it in HttpSession.
If invalid → Returns error message.
Example Controller (custom login):
@PostMapping("/login")
public String login(@RequestParam String username,
@RequestParam String password) {
// Validate using service
if(authService.authenticate(username, password)) {
return "home"; // success page
}
return "login?error";
}
2. User Session Handling
Spring Security automatically manages sessions. For stateless apps (like REST APIs), JWT tokens are issued instead of sessions.
Token is generated after login.
Sent in headers (Authorization: Bearer <token>) with each request.
Validated by a filter before accessing resources.
3. Logout
In session-based apps → HttpSession.invalidate() clears session.
In Spring Security → simply use:
http.logout().logoutUrl("/logout").logoutSuccessUrl("/login")
In JWT-based apps → client deletes the token (server may blacklist).
👉 In short, login validates credentials & creates a session/token, while logout clears session or invalidates token. Spring Security simplifies this with built-in authentication and logout handling.
Do you want me to extend this with a JWT-based login/logout flow (step-by-step), since it’s common in modern REST APIs?
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