cookie的保存与读取

一个简单的例子
1. 写入Cookie --- writecookie.jsp
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<%@ page contentType="text/html; charset=ISO8859_1" %>
<%
   Cookie _cookie=new Cookie("user_delfancom", "delfan");
   _cookie.setMaxAge(30*60); // 设置Cookie的存活时间为30分钟
   response.addCookie(_cookie); // 写入客户端硬盘
   out.print("写Cookie完成");
%>

2. 读取Cookie.jsp --- readcookie.jsp
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<%
   Cookie cookies[]=request.getCookies(); // 将适用目录下所有Cookie读入并存入cookies数组中
   Cookie sCookie=null; 
   String sname=null;
   String name=null;
   if(cookies==null) // 如果没有任何cookie
     out.print("none any cookie");
   else
   {
     out.print(cookies.length + "<br>");
     for(int i=0;i<cookies.length; i++) // 循环列出所有可用的Cookie
     {
       sCookie=cookies[i];
       sname=sCookie.getName();
       name = sCookie.getValue();
       out.println(sname + "->" + name + "<br>");
     }