实验4：Cookie操作

实验要求：

编写主页index.jsp，可参考如下页面：
在登录验证页面login.jsp中只需简单判断用户名为abc、密码为123即可。关键操作是判断复选框选中与否状态，并将用户名称或密码值保存到cookie中，最后通过简单的链接返回到index.jsp。

index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<body>
<center>
<h1>实验004登录</h1>
</center>
<hr/>
<%
String CookieUserName = "";
String CookiePassWord = "";
Cookie[] CookieArray = request.getCookies();
if (CookieArray != null){
for (int i = 0;i < CookieArray.length;i ++){
if (CookieArray[i].getName().equals("CookieUserName")){
CookieUserName = CookieArray[i].getValue();
}
else if (CookieArray[i].getName().equals("CookiePassWord")){
CookiePassWord = CookieArray[i].getValue();
}
}
}

 %>
<form name=myform action="login.jsp" method="post">
<table width="100%">
<tr>
<td colspan="2" align="center"><img src="img/icon.bmp"></td>
</tr>
<tr>
<td align="right" width="45%">用户名称：</td>
<td><input type="text" name="UserName" value="<%=CookieUserName%>"/></td>
</tr>
<tr>
<td align="right">密码：</td>
<td><input type="password" name="PassWord" value="<%=CookiePassWord%>"/></td>
</tr>
<tr>
<td colspan="2" align="center"><input type="checkbox" name="UserNameCheckBox" value="true">自动记录名称</td>
</tr>
<tr>
<td colspan="2" align="center"><input type="checkbox" name="PassWordCheckBox" value="true">自动记录密码</td>
</tr>
<tr>
<td colspan="2" align="center"><input type="submit" value="登录"> <input type="reset" value="重置"></td>
</tr>
</table>
</form>
<hr/>
</body>

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<center>
<%
final String DBUserName = "abc";
final String DBPassWord = "123";
String UserName = request.getParameter("UserName");
String PassWord = request.getParameter("PassWord");
if (UserName.equals(DBUserName)){
if (PassWord.equals(DBPassWord)){
out.print("<strong>登录成功。<strong><br/>");
String RememberUserName = request.getParameter("UserNameCheckBox");
String RememberPassWord = request.getParameter("PassWordCheckBox");
if (RememberUserName != null && RememberUserName.equals("true")){
Cookie CookieUserName = new Cookie("CookieUserName",UserName);
CookieUserName.setMaxAge(7 * 24 * 60 * 60);//设置有效期7天
   response.addCookie(CookieUserName); 
}
if (RememberPassWord != null && RememberPassWord.equals("true")){
Cookie CookiePassWord = new Cookie("CookiePassWord",PassWord);
CookiePassWord.setMaxAge(7 * 24 * 60 * 60);//设置有效期7天
   response.addCookie(CookiePassWord); 
}
}
else{
out.print("<strong>密码不正确。<strong><br/>");
}
}
else{
out.print("<strong>账号不正确。<strong><br/>");
}
 %>
<a href="index.jsp">重新登录</a>
 </center>

Cookie的内容都保存在客户端，所以一般用来保存表单、记住账号密码等。

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J2EE实验4：Cookie操作

实验4：Cookie操作

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