//把数据存储到cookie中。
		public class SetCookie_01 extends HttpServlet {
		 
			public void doGet(HttpServletRequest request, HttpServletResponse response)
					throws ServletException, IOException {
				//创建Cookie对象
				Cookie cookie = new Cookie("userName","gouwa");
				//设置cookie最大有效时间
				cookie.setMaxAge(60*60*24*7);
				//设置有效路径
				cookie.setPath("/day39/getCookie");
				
				//把cookie 发送给浏览器
				response.addCookie(cookie);
			}
		 
			public void doPost(HttpServletRequest request, HttpServletResponse response)
					throws ServletException, IOException {
				doGet(request, response);
			}
		}