shiro learns the filter-logoutFilter provided by 19-shiro

This class is very simple. It is used to log out the previously logged in user when logging out, and redirect to the configured page. The default is "/" . You can change the redirectUrl attribute to jump to the page we specify.

 

Take a look at his preHandle method

@Override
    protectedboolean preHandle(ServletRequest request, ServletResponse response) throws Exception {
        Subject subject = getSubject(request, response);
        String redirectUrl = getRedirectUrl(request, response, subject);
        try {
            subject.logout();//Call the logout method. Deletes the content previously put into the session from the session. You will have to log in again the next time you visit.
        } catch (SessionException ise) {
            log.debug("Encountered session exception during logout.  This can generally safely be ignored.", ise);
        }
        issueRedirect(request, response, redirectUrl);
        returnfalse;
    }

 

 

In this method, false is returned , that is, no other operations are performed, and the browser is redirected directly. So if we have other operations, we can inherit this class and operate in the afterCompletion method.