Cookie存活时间以及Cookie存储中文
cookie在浏览器中保存多长时间:
1.默认情况下,当浏览器关闭后,Cookie数据被销毁
2.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消息
package com.example.cookie; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.Cookie; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; @WebServlet(name = "CookieDemo4", value = "/CookieDemo4") public class CookieDemo4 extends HttpServlet { @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request, response); } @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //1.创建Cookie对象 Cookie c1 = new Cookie("msg", "setMaxAge"); //2.设置cookie的存活时间 //c1.setMaxAge(30);//将cookie持久化到硬盘 30秒后自己删除cookie文件 //c1.setMaxAge(-1);//关闭浏览器cookie数据被销毁 c1.setMaxAge(0);//删除cookie消息 //3.发送Cookie response.addCookie(c1); } }
Cookie存储中文:
在tomcat 8 之前 cookie不能直接存储中文数据
需要将中文数据转码,一般采用URL编码。(%E3)
在tomcat 8 之后 cookie支持中文数据
@WebServlet(name = "CookieDemo4", value = "/CookieDemo4") public class CookieDemo4 extends HttpServlet { @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request, response); } @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //1.创建Cookie对象 Cookie c1 = new Cookie("msg", "张三"); //2.发送Cookie response.addCookie(c1); } }
标签:存储,javax,存活,Cookie,import,cookie,c1,response From: https://www.cnblogs.com/qihaokuan/p/16971685.html