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我試圖在一個servlet中創建一個cookie，將它添加到response（）並使用DisaptcherServlet將其轉發到另一個servlet，並嘗試使用request.getCookies（ ）。但是這總是出現爲空。使用請求調度程序將請求從一個servlet轉發到另一個
//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");
}
}