How to redirect in a servlet filter?
In Filter the response is of ServletResponse rather than HttpServletResponse. Hence do the cast to HttpServletResponse.
HttpServletResponse httpResponse = (HttpServletResponse) response;httpResponse.sendRedirect("/login.jsp");If using a context path:
httpResponse.sendRedirect(req.getContextPath() + "/login.jsp");Also don't forget to call return; at the end.
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
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);}