使用cookie记录登录名，下次登录时能够记得上次的登录名，使用session记住登录信息并验证是否登录，防止利用url打开网站，并实现退出登录功能

时间：2016-10-30 16:42:12 阅读：327 评论：0 收藏：0 [点我收藏+]

标签：highlight src 验证 str write ddc strong 系统 log

<%@ 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>
<%
String name=null;
Cookie[] cks = request.getCookies() ;//获得cookie的集合

if(cks != null)
{ 
     // 如果已经设置了cookie ， 则得到它的值，将该值放在登入名文本框的value中
        for(int i=0; i<cks.length; i++)
        {
               if(cks[i].getName().equals("name"))

            	name = cks[i].getValue();
        }
     }

%>
<form  action="ShoppCheck.jsp" mothod="post">
用户名：<input type="text"name="name"  value="<% if(name != null) out.println(name); %>"><br>
密码：&nbsp&nbsp&nbsp&nbsp<input type= "password"name="password"><br>
<input type="submit" value="登入">

</form>
</body>
</html>

<%@page import="com.hanqi.web.ShoppDAO"%>
<%@ 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>
<%
//设置不缓存页面
//response.setHeader("Cache_Control", "no-cache");

//接受数据
String name =request.getParameter("name");
String password =request.getParameter("password");

if(name==null || password == null||name.equals("")||password.equals(""))
{
	//排除用户名和密码为null或 为空字符串的情况
out.write("请正确登录系统");

}
else
{
	//检查登录信息
	ShoppDAO  sd= new ShoppDAO ();//导包
	if(sd.checkLogin(name, password))
	{
		//out.write("登录成功");
		//无缓存的直接发送
		response.getWriter().write("登入成功");
		
		//创建cookie
		Cookie ck= new Cookie("name", name);
		//设置过期时间
		ck.setMaxAge(10*24*60*60);
		//发送
		response.addCookie(ck);
		
		//创建session
		session.setAttribute("name", name);
		//页面跳转
		response.sendRedirect("xtMain.jsp");
	}
	else
	{
		out.write("登入失败");
		//2秒后跳回登入页面
		response.setHeader("refresh", "2;URL=shoppMain.jsp");
	}
	
}

%>


</body>
</html>

<%@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>
系统主页面
<br>
<%
//检查cookie
//获得cookie集合
Cookie[] cks=  request.getCookies();
for(Cookie ck: cks)
{
	//解码
	out.write(ck.getName()+"="+URLDecoder.decode(ck.getValue()) +"<br>");
}


//判断session
String cairnumber = session.getAttribute("name").toString();
out.print("name="+cairnumber);

%>
<a href="success.jsp">测试是否已登录的页面</a>

</body>
</html>

<%@ 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>
测试是否登录显示的页面
<br>

<%
Object obj =session.getAttribute("name");//判断session是否存在
if(obj==null)
{
 out.print("您没有登入")	;
 response.setHeader("refresh", "2;URL=shoppMain.jsp");//若2秒钟无操作自动退回主界面
}
else
{
	out.print("name="+obj.toString());
	//销毁所有session
	//session.invalidate();
	//移除某个属性
	session.removeAttribute("name");
	//response.sendRedirect("tuichu.jsp");
%>	
	<a href="tuichu.jsp">退出</a>
<% 	
}

%>

</body>
</html>

<%@ 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>
系统将退出。。。。。
</body>
</html>

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