What is the difference between response sendRedirect and request getRequestDispatcher forward request response

Question

I have got a problem with my page jump when I use JAVA  if I use   response sendRedirect  login jsp     then I get this url  http   localhost 8080 login jsp  But if I use   request getRequestDispathcer  login jsp   forward request  response    then I get this url  http   localhost 8080 Shopping login jsp  the  Shopping  is the name of my module    What s the difference

User · Answer

Simply difference between Forward ServletRequest request  ServletResponse response  and sendRedirect String url  is  forward        The forward   method is executed in the server side  The request is transfer to other resource within same server  It does not depend on the client   s request protocol since the forward    method is provided by the servlet container  The request is shared by the target resource  Only one call is consumed in this method  It can be used within server  We cannot see forwarded message  it is transparent  The forward   method is faster than sendRedirect   method  It is declared in RequestDispatcher interface    sendRedirect      The sendRedirect   method is executed in the client side  The request is transfer to other resource to different server  The sendRedirect   method is provided under HTTP so it can be used only with HTTP clients  New request is created for the destination resource  Two request and response calls are consumed  It can be used within and outside the server  We can see redirected address  it is not transparent  The sendRedirect   method is slower because when new request is created old request object is lost  It is declared in HttpServletResponse

User · Answer

To simply explain the difference       response sendRedirect  login jsp      doesn t prepend the contextpath  refers to the application module in which the servlet is bundled   but  whereas   request getRequestDispathcer  login jsp   forward request  response     will prepend the contextpath of the respective application  Furthermore  Redirect request is used to redirect to resources to different servers or domains  This transfer of control task is delegated to the browser by the container  That is  the redirect sends a header back to the browser   client  This header contains the resource url to be redirected by the browser  Then the browser initiates a new request to the given url   Forward request is used to forward to resources available within the server from where the call is made  This transfer of control is done by the container internally and browser   client is not involved

User · Answer

1 redirect return the request to the browser from server then resend the request to the server from browser   2 forward send the request to another servlet  servlet to servlet

User · Answer

forward  Control can be forward to resources available within the server from where the call is made  This transfer of control is done by the container internally and browser   client is not involved  This is the major difference between forward and sendRedirect  When the forward is done  the original request and response objects are transfered along with additional parameters if needed   redirect  Control can be redirect to resources to different servers or domains  This transfer of control task is delegated to the browser by the container  That is  the redirect sends a header back to the browser   client  This header contains the resource url to be redirected by the browser  Then the browser initiates a new request to the given url  Since it is a new request  the old request and response object is lost   For example  sendRedirect can transfer control from http   google com to http   anydomain com but forward cannot do this      session    is not lost in both forward and redirect   To feel the difference between forward and sendRedirect visually see the address bar of your browser  in forward  you will not see the forwarded address  since the browser is not involved  in redirect  you can see the redirected address

User · Answer

Redirect and Request dispatcher are two different methods to move form one page to another  if we are using redirect to a new page actually a new request is happening from the client side itself to the new page  so we can see the change in the URL  Since redirection is a new request  the old request values are not available  here

[java] What is the difference between response.sendRedirect() and request.getRequestDispatcher().forward(request,response)

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