How to check if a user is logged in when using auth-method FORM

Question

I am using auth-method FORM with apache tomcat to authenticate users. I am using the default j_security_check action.

Else a sign in link. How do I check if the user has signed in?

Answer 1

您可以使用HttpServletRequest.getUserPrincipal()并检查它以查找登录用户。

Answer 2

登录状态与HttpServletRequest.getUserPrincipal()返回非null的条件相同。

Answer 3

if(request.authenticate(response)){
    System.out.println("The User is Authenticated");
}else{
   System.out.println("The User is not Authenticated");
}

Use this code inside your JSP or in the Servlets.