会话技术_Cookie_快速入门和会话技术_Cookie_原理分析

快速入门

　　步骤：

　　　　创建Cookie对象，绑定数据

　　　　　　new CookIe（String name，String value）

　　　　发送Cookie对象

　　　　　　Response.addCookie(Cookie cookie)

　　　　获取Cookie,拿到数据

　　　　　　Cookie[] Request.getCookies();

@WebServlet("/CookieDemo1")
public class CookieDemo1 extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        Cookie cookie = new Cookie("msg","hello");
        response.addCookie(cookie);


    }

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

@WebServlet("/CookieDemo2")
public class CookieDemo2 extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        Cookie[] cookies = request.getCookies();
        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);
    }
}

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

会话技术_Cookie_原理分析

实现原理：

　　基于响应头set-cookie和请求头cookie实现

 

 

 

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