Cookie的生命周期问题

代码示例：

public class RegistServlet extends HttpServlet {

       public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

              request.setCharacterEncoding("UTF-8");

              //获取用户名和密码

              String username = request.getParameter("username");

              String password = request.getParameter("password");

              System.out.println("用户名:"+username);

              System.out.println("密码:"+password);

              //创建cookie对象，将用户名和密码连接存储，使用逗号分开

              Cookie cookie = new Cookie("userpass", username+","+password);

              //设置cookie的存活时间,里面的参数是以秒为单位

              //cookie.setMaxAge(60*60);

              //如果maxAge设置成-1代表是当前cookie的销毁时间是浏览器关闭，和默认是一样的

              //cookie.setMaxAge(-1);

              //如果maxAge设置成0代表删除已经存在的和当前同名的cookie

              cookie.setMaxAge(0);

              //把cookie写入浏览器

              response.addCookie(cookie);

              //跳转页面

              request.getRequestDispatcher("/regist1.html").forward(request, response);

       }

}