CH5——jsp中的cookie应用
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8" errorPage="login.jsp"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><%request.setCharacterEncoding("UTF-8");String username="";int visitTimes = 0;Cookie[] cookies = request.getCookies();for(int i=0;cookies!=null&& i<cookies.length;i++){Cookie cookie = cookies[i];if("username".equals(cookie.getName())){username = cookie.getValue();}else if("visitTimes".equals(cookie.getName())){visitTimes = Integer.parseInt(cookie.getValue());}}if(username==null || username.trim().equals("")){throw new Exception("您还没有登陆，请先登录");}Cookie visitTimesCookie = new Cookie("visitTimes",Integer.toString(++visitTimes));response.addCookie(visitTimesCookie); %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head> <title>登录页面</title> </head> <body> <div align="center" style="margin: 10px;"> <fieldset> <legend>登录信息</legend> <form action="login.jsp" method="post"> <table> <tr> <td>您的帐号：</td> <td><%=username %></td> </tr> <tr> <td>登录次数：</td> <td><%=visitTimes %></td> </tr> <tr> <td></td> <td> <input type="button" value="刷新" onclick="location='<%=request.getRequestURI() %>?ts='+ new Date().getTime();" name="code"><%@ page language="java" import="java.util.*" pageEncoding="UTF-8" isErrorPage="true" ><%request.setCharacterEncoding("UTF-8");response.setCharacterEncoding("UTF-8");if("POST".equals(request.getMethod())){Cookie usernameCookie = new Cookie("username",request.getParameter("username"));Cookie visittimesCookie = new Cookie("visitTimes","0");response.addCookie(usernameCookie);response.addCookie(visittimesCookie);response.sendRedirect(request.getContextPath()+"/cookie.jsp"); return;} %><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head> <title>请先登录</title> <!-- <link rel="stylesheet" type="text/css" href="css/style.css" />--> </head> <body> <div align="center" style="margin: 10px;"> <fieldset> <legend>登录</legend> <form action="login.jsp" method="post"> <table> <tr> <td></td> <td><span><img src="images/errorstate.png" /></span> <span style="color: red;"><%=exception.getMessage() %></span> </td> </tr> <tr> <td>帐号：</td> <td><input type="text" name="username" style="width: 200px;"></td> </tr> <tr> <td>密码：</td> <td><input type="password" name="password" style="width: 200px;"></td> </tr> <tr> <td></td> <td><input type="submit" value="登 录" alt="CH5——jsp中的cookie施用">
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