会话跟踪技术之——cookie

时间：2021-01-27 10:38:59

1.cookieForm

 <%@ page language="java" contentType="text/html; charset=UTF-8"

     pageEncoding="UTF-8"%>

 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

 <html>

 <head>

 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

 <title>Insert title here</title>

 </head>

 <body>

 <form action="setCookie.jsp" method="post">

 网名：<input type="text" name="webName"/><br/>

 网址：<input type="url" name="url"/><br/>

 <button type="submit">提交</button>

 </form>

 </body>

 </html>

2.setCookie

 <%@page import="java.net.URLEncoder"%>

 <%@ page language="java" contentType="text/html; charset=UTF-8"

     pageEncoding="UTF-8"%>

 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

 <html>

 <head>

 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

 <title>Insert title here</title>

 </head>

 <body>

 <%

 //获取从表单提交过来的数据，作为cookie的对象

  String webName=request.getParameter("webName");

  String url=request.getParameter("url");

  //解决表单传到另一个页面乱码问题

  webName=new String(webName.getBytes("ISO-8859-1"),"utf-8");

  //分别创建两个cookie对象

  Cookie cookie1=new Cookie("name",URLEncoder.encode(request.getParameter("webName"),"utf-8"));

  Cookie cookie2=new Cookie("url",url);

  //分别设置Cookie的有限期

  cookie1.setMaxAge(3*3600);//设置3小时

  cookie2.setMaxAge(300);

  //在响应头部添加Cookie

  response.addCookie(cookie1);

  response.addCookie(cookie2);

 %>

 </body>

 </html>

3.getCookie

 <%@page import="java.net.URLDecoder"%>

 <%@ page language="java" contentType="text/html; charset=UTF-8"

     pageEncoding="UTF-8"%>

 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

 <html>

 <head>

 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

 <title>Insert title here</title>

 </head>

 <body>

 <%

 Cookie[] cookie=request.getCookies();

 if(cookie.length>0)

 {

     for(int i=0;i<cookie.length;i++)

     {

         String name=cookie[i].getName();

         String value=cookie[i].getValue();

         /* //查找某个cookie来删除

         if(name.equalsIgnoreCase("name"))

         {

             cookie[i].setMaxAge(0);

             response.addCookie(cookie[i]);

         } */

         //如果value的值出现乱码，则要进行解码

         value=URLDecoder.decode(value, "utf-8");

         out.print(name+"<br/>");

         out.print(value);

     }

 }

 %>

 </body>

 </html>

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