删除cookie

来源：互联网发布：uml画图软件编辑：程序博客网时间：2024/05/22 10:25

创建

package com.itheima.demo;import java.io.IOException;import java.io.PrintWriter;import java.util.Date;import javax.servlet.ServletException;import javax.servlet.http.Cookie;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class CookieDemo2 extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException { response.setContentType("text/html;charset=utf-8");            PrintWriter out  = response.getWriter();       //获取客户端保存的最后访问时间           Cookie[] cookies=request.getCookies();//获取客户端的所有cookie对象           //因为如果是第一次访问，浏览器可能没有cookie，所以要先判断下非空          for (int i = 0;cookies!=null&& i < cookies.length; i++) {              if("lastAccessTime".equals(cookies[i].getName())){//判断当前的cookie中name是否是想要的cookie                 long l=Long.parseLong(cookies[i].getValue());//如果是想要的Cookie，则把Cookie中的value取出(毫秒值)                 out.write("你的最后访问时间为："+new Date(l).toLocaleString());//yyyy-MM-dd（把lang值转化为本地时间）              }          }                  out.print("<a href='"+request.getContextPath()+"/ClearServlet'>clear</a>");//删除链接     //第一次访问可能没有cookie，访问过之后就需要自己创建一个cookie          //创建cookie，并把信息写回到客户端cookie只能存字符串：          Cookie ck=new Cookie("lastAccessTime",System.currentTimeMillis()+"");                 //把cookie写回到客户端                  response.addCookie(ck);  } public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {          doGet(request, response);}}

删除

package com.itheima.demo;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.Cookie;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class ClearServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {       //创建一个Cookie对象Cookie ck=new Cookie("lastAccessTime","");ck.setPath("/");//要设置删除Cookie的路径，否则可能会删除错ck.setMaxAge(0); //相当于删除response.addCookie(ck);//把创建的cookie写回客户端去} public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {           doGet(request, response);}}

0 0