session登录练习

登录，判断账号密码跳转到主页面，退出登录，直接访问主页面无法访问

1.登录页面，功能：登录，销毁session

<%@ 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>登录</title>
</head>
<body>
&nbsp;请登录
<%
//退出销毁session
session.invalidate();
%>

<%--跳转到判断页面 --%>
<form action="testpw0628.jsp" method="post">
<table>
<tr>
<td>用户名：</td>
<td><input type="text" name="username"/></td>
</tr>

<tr>
<td>密&nbsp;&nbsp;码：</td>
<td><input type="password" name="password"/></td>
</tr>

<tr>
<td><input type="submit" value="登录"/></td>
</tr>

</table>

</form>


</body>
</html>

 

2.判断账号，正确跳转主页

<%@ 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>验证信息</title>
</head>
<body>

<%

String username=request.getParameter("username");
String password=request.getParameter("password");

if(username!=""&&password!="")
{
    if(username.equals("test")&&password.equals("4321"))
    {
        //设置session
        session.setAttribute("username",username);
        
        //跳转到主页面
        response.sendRedirect("main0628.jsp");
    }
    else
    {
        out.print("用户名或密码错误！");
    }
%>

<%}else{
        
    out.print("用户名和密码不能为空");
}

%>


</body>
</html>

 

3.主页，账号密码正确可访问，直接访问提示回话超时，可以退出登录

<%@ 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>主页</title>
</head>
<body>


<%

//检查session
Object obj=session.getAttribute("username");

if(obj!=null)
{
    out.print(obj.toString()+"，欢迎回来。");
    }
else
{
out.print("回话超时，请重新登录");    
response.setHeader("refresh", "5;login0628.jsp");
}


%>
主页
<br>
<a href="login0628.jsp">退出登录</a>


</body>
</html>

 

posted @ 2016-06-28 16:52  鱼在我这里  阅读(165)  评论(0)  编辑  收藏  举报