1. Return ModelAndView
2. Return void
<1> request
New msg.jsp
<2> response
3. Return String
<1> Returns the name of the view (view response)
<2> redirect与forward
Forwarding the request (REQUEST request can bring parameter) redirection
New msg.jsp
<1> Returns the name of the view (view response)
<2> redirect与forward
Forwarding the request (REQUEST request can bring parameter) redirection