Cookie的细节
一次可不可以发送多个？
可以
可以创建多个Cookie对象使用Response调用多次addCookie方法cookie即可
@WebServlet("/CookieDemo3")
public class CookieDemo3 extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
Cookie cookie1 = new Cookie("msg","hello");
Cookie cookie2 = new Cookie("name","zhangsan");
response.addCookie(cookie1);
response.addCookie(cookie2);
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doPost(request, response);
}
}
cookie在浏览器中保存多长时间。
默认情况下，当浏览关闭后，Cook数据被销毁
持久化存储
setMaxAge(int seconds)
正数：将Cookie数据写到硬盘的文件中。持久化存储。cookie存活时间
负数：默认值
零：删除cookie信息
@WebServlet("/CookieDemo4")
public class CookieDemo4 extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
Cookie cookie1 = new Cookie("msg","setMaxAge");
// cookie1.setMaxAge(30);
// cookie1.setMaxAge(-1);
// cookie1.setMaxAge(300);
cookie1.setMaxAge(0);
response.addCookie(cookie1);
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doPost(request, response);
}
}
