8周

1.登陆
输入用户名密码，判断用户名和密码相同，登陆成功，session中保存用户的用户名，进入主页main.jsp，主页有一个退出按钮，点击，回到登陆页login.jsp。要求：退出登录后，如果在浏览器直接输入主页main.jsp，访问不了，直接跳到登陆页。

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title></title>
</head>

<body>
    <form action="MyJsp.jsp" method="post" name="eight">
             请输入账号：<input name="name" type="text"/><br/>
             请输入密码：<input name="password" type="password"/><br/>
           <input type="button" value="登录" onclick="denglu()"/>
      <script type="text/javascript">
         function denglu(){
            if(eight.name.value==""){
               alert("账号不能为空！");
               return;
            }
             if(eight.password.value==""){
               alert("密码不能为空！");
               return;
            }
            eight.submit();
         }
     </script>
   </form>
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title></title>
</head>

<body>
<%      request.setCharacterEncoding("utf-8");
        String name = request.getParameter("name");
        String password = request.getParameter("password");
        if (name.equals(password)) {
            session.setAttribute("name", name);
            request.getRequestDispatcher("1.jsp")
                    .forward(request, response);
        } else {
            request.getRequestDispatcher("2.jsp").forward(request,
                    response);
        }
    %>
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>
  <head> 
  </head>
  <body>
 <%
        String name = (String) session.getAttribute("name");
        if (name == null) {
            response.sendRedirect("Interface1.jsp");
        }
    %>
    欢迎你<%=name%><br>
    <br>
    <form action="3.jsp">
        <input type="submit" value="退出登录">
    </form>
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>
 <head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
登录失败
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
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>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>退出界面</title>
</head>
<body>
<%
        session.invalidate();
        response.setHeader("refresh", "0;url=1.jsp");
    %>
</body>
</html>

 

 

 

 

posted @ 2022-04-24 19:15  柳啊柳啊柳  阅读(126)  评论(0)  编辑  收藏  举报