会话技术的概述以及Cookie的快速入门
作者:互联网
会话技术的概述
1、会话:一次会话中包含多次请求和响应
一次会话:浏览器第一次给服务器资源发送请求,会话建立,直到有一方断开为止
2、功能:再一次会话的范围内的多次请求间,共享数据
3、方式:
1、客户端会话技术:Cookie
2、服务端会话技术:Session
Cookie的快速入门
使用步骤:
1、创建Cookie对象,绑定数据
new Cookie(String name,String value);
2、发送Cookie对象
response.addCookie(Cookie cookie);
3、获取Cookie,拿到数据
Cookie[] request.getCookies();
创建和发送Cookie:
/** * Cookie快速入门 */ @WebServlet("/CookieDemo1") public class CookieDemo1 extends HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //创建Cookie对象 Cookie cookie = new Cookie("msg", "hello"); //发送Cookie response.addCookie(cookie); } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request, response); } }
获取和遍历Cookie:
/** * Cookie快速入门 */ @WebServlet("/CookieDemo1") 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); } }
标签:入门,void,request,HttpServletResponse,会话,Cookie,response 来源: https://www.cnblogs.com/xjw12345/p/16572327.html