cookie存储及取出时间问题cookie存储及取出时间问题

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cookie存储及取出时间问题

cookie的存储

index.html

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>index.html</title>
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="this is my page">
    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
 </head>
  <body>
   <!-下面的cookie是项目名称->
    <a href="/cookie/HelloServlet01">HelloServlet01</a> 
  </body>
</html>

HelloServlet01.java

package servlet;

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 HelloServlet01 extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
           //创建一个Cookie对象
           Cookie cookie = new Cookie("name","aaa");
           //设定这个cookie的有效期
           cookie.setMaxAge(60*60);
           //设定cookie的绑定uri路径
           //为了避免这里把项目名称写死在程序中
           //则可以采用request.getContextPath()来获取应用名称
           //cookie.setPath("/pro-servlet-16");
           cookie.setPath(request.getContextPath());
           //把cookie放入response
           response.addCookie(cookie);

           PrintWriter pw = response.getWriter();
           pw.write("test cookie");
    }
}

cookie的取出

index02.html

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>index02.html</title>
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="this is my page">
    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
 </head>
  <body>
    <a href="/cookie/HelloServlet02">HelloServlet02</a> 
  </body>
</html>

HelloServlet02.java

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 HelloServlet02 extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        //获取请求头发送的cookie
        Cookie[] cookies = request.getCookies();
        //Cookie对象的个数
        System.out.println(cookies.length);
        //使用在HelloServlet01中放入的name属性名称或者其值
        //遍历cookies数组
        for(Cookie cookie:cookies){
            //如果某个cookie对象的名称是name，则获取其值
            if("name".equals(cookie.getName())){
                System.out.println("value:"+cookie.getValue());
            }
        }
    }
}

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
    xmlns="http://java.sun.com/xml/ns/javaee" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

  <servlet>
    <servlet-name>HelloServlet01</servlet-name>
    <servlet-class>servlet.HelloServlet01</servlet-class>
  </servlet>
  <servlet>
    <servlet-name>HelloServlet02</servlet-name>
    <servlet-class>servlet.HelloServlet02</servlet-class>
  </servlet>

  <servlet-mapping>
    <servlet-name>HelloServlet01</servlet-name>
    <url-pattern>/HelloServlet01</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>HelloServlet02</servlet-name>
    <url-pattern>/HelloServlet02</url-pattern>
  </servlet-mapping>
</web-app>