How to redirect in a servlet filter

Question

I m trying to find a method to redirect my request from a filter to the login page but I don t know how to redirect from servlet  I ve searched but what I find is sendRedirect   method  I can t find this method on my response object in the filter  What s the cause  How can I solve this

User · Answer

Your response object is declared as a ServletResponse  To use the sendRedirect   method  you have to cast it to HttpServletResponse  This is an extended interface that adds methods related to the HTTP protocol

User · Answer

I m trying to find a method to redirect my request from filter to login page    Don t  You just invoke   chain doFilter request  response     from filter and the normal flow will go ahead      I don t know how to redirect from servlet   You can use   response sendRedirect url     to redirect from servlet

User · Answer

If you also want to keep hash and get parameter  you can do something like this  fill redirectMap at filter init    String uri   request getRequestURI     String   uriParts   uri split          String path   uriParts 0   String rest   uri substring uriParts 0  length      if redirectMap containsKey path         response sendRedirect redirectMap get path    rest     else       chain doFilter request  response

User · Answer

In Filter the response is of ServletResponse rather than HttpServletResponse  Hence do the cast to HttpServletResponse  HttpServletResponse httpResponse    HttpServletResponse  response  httpResponse sendRedirect  quot  login jsp quot     If using a context path  httpResponse sendRedirect req getContextPath      quot  login jsp quot     Also don t forget to call return  at the end

User · Answer

Try and check of your ServletResponse response is an instanceof HttpServletResponse like so   if  response instanceof HttpServletResponse        response sendRedirect

[java] How to redirect in a servlet filter?

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