Cookie原理分析以及发送多个Cookie

Cookie原理分析

基于响应头set-cookie和请求头cookie实现

 

 

 

 

 

 

 

发送多个Cookie

一次可不可以发送多个Cookie？

　　可以。

　　可以创建多个Cookie对象，使用response调用多次addCookie方法发送cookie即可

发送cookie：

@WebServlet("/CookieDemo3")
public class CookieDemo3 extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //创建Cookie对象
        Cookie c1 = new Cookie("msg", "hello");
        Cookie c2 = new Cookie("name", "zhangsan");
        //发送Cookie
        response.addCookie(c1);
        response.addCookie(c2);
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }
}

获取cookie：

@WebServlet("/CookieDemo2")
public class CookieDemo2 extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //获取Cookie
        Cookie[] cookies = request.getCookies();
        //获取数据，遍历Cookies
        if (cookies!=null){
            for (Cookie c : cookies) {
                String name = c.getName();
                String value = c.getValue();
                System.out.println(name+"："+value);
            }
        }
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }
}