SpringSecurity，SpringSecurity Form Login

登錄過程

1)首先,訪問沒有授權的/private
2)FilterSecurityInterceptor拒絕訪問,并拋出AccessDeniedException
3)ExceptionTranslationFilter根據AuthenticationEntryPoint重定向到/login
4)瀏覽器根據重定向,訪問login
5)渲染登錄界面

當用戶在登錄界面輸入用戶名和密碼后,進入到了AbstractAuthenticationProcessingFilter流程,這里是具體的實現類UsernamePasswordAuthenticationFilter

protected void configure(HttpSecurity http) {http// ....formLogin(withDefaults());
}

SpringSecurity，參考:
https://docs.spring.io/spring-security/site/docs/5.4.5/reference/html5/#servlet-authentication-form