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我试图在一个servlet中创建一个cookie，将它添加到response（）并使用DisaptcherServlet将其转发到另一个servlet，并尝试使用request.getCookies（ ）。但是这总是出现为空。使用请求调度程序将请求从一个servlet转发到另一个
//Servlet one
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String userName = request.getParameter("username");
String password = request.getParameter("password");
Cookie cookie = new Cookie("name", "value");
cookie.setMaxAge(30);
response.addCookie(cookie);
if(userName.equals("username") && password.equals("*****")){
RequestDispatcher requestDispatcher = request.getRequestDispatcher("/Welcome");
requestDispatcher.forward(request, response);
}
else{
System.out.println("invalid credentials");
}
}
//welcome servlet
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
Cookie [] cookie = request.getCookies();
if(cookie != null){
System.out.println("sucess");
}
else{
System.out.println("cookieis null");
}
}