request.getRequestDispatcher和response.sendRedirect不起作用

Question

Yes, I know that this is for sure duplicate question. But... I have read all of answers for earlier asked questions, tried to fix everything... and my code still doesn't work.

In index.jsp:

<form action="/Login"method="post">

and

<input type="submit" value="LogIn">

In post method of servlet "/Login":

if (result == 1) {
RequestDispatcher view=request.getRequestDispatcher(url);
view.forward(request, response);
} else {
response.sendRedirect("index.jsp");
return;
}

I was trying with:

"http://localhost:8080/home.jsp",
"/home.jsp",
"home.jsp"

response.sendRedirect

trying to do with and without "return;".

And nothing.

This what I saw is only blank page and: If doPost() method: url is "http://localhost:8080/Login" . If doGet() method: url is the same as abovementioned plus parameters input into a form.

Could you help me?

Answer 1

If you want to redirect user to another page with a brand new request then using sendRedirect function, but you must send redirect to the servlet , servlet will process and return to you a page. You can not sendRedirect directly to the jsp page (you send redirect to a jsp page, it's like you right click on jsp page and run it on server). Please refer to this post to see the use of sendRedirect method.