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.

If a user has signed in, I must display a Sign out link. Else a sign in link. How do I check if the user has signed in?

Also, how do I log a user out?

score 7 · Accepted Answer · answered Jul 29 '12 at 20:57

7

You can use HttpServletRequest.getUserPrincipal() and check it to find the logged in user.

answered Jul 29 '12 at 20:57

Amir Pashazadeh

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user207421 · Answer 2 · 2016-04-11T10:43:13.057

1

The state of being logged in is identical to the condition that HttpServletRequest.getUserPrincipal() returns non-null.

edited Apr 11 '16 at 10:43

answered Jul 30 '12 at 01:13

user207421

305,947
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There is no `getUserPrincipal()` method in `HttpServlet`, it is in `HttpServletRequest` as I mentioned. – Amir Pashazadeh Jul 30 '12 at 07:12

score 0 · Answer 3 · answered Jan 24 '22 at 11:10

0

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.

answered Jan 24 '22 at 11:10

Rory

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

3 Answers3