第8次作业jsp 

<body bgcolor=#ccffcc>
    <script type="text/javascript">
        function validate() {
            if (loginForm.uname.value == "") {
                alert("账号不能为空!");
                return;
            }
            if (loginForm.upwd.value == "") {
                alert("密码不能为空!");
                return;
            }
            loginForm.submit();
        }
    </script>


    <form name="loginForm" action="dologin.jsp" method="post">

        用户名:<input type="text" name="uname"><br> 密码: <input
            type="password" name="upwd"> <input type="button" value="登录"
            onClick="validate()">





    </form>
</body>

　　

<body >
    <%
        request.setCharacterEncoding("utf-8");
        String uname = request.getParameter("uname");
        String upwd = request.getParameter("upwd");
        if (uname.equals(upwd)) {
            session.setAttribute("uname", uname);
            request.getRequestDispatcher("main.jsp").forward(request,
                    response);
        } else {
            response.sendRedirect("fail.jsp");
        }
    %>
</body>

　　

 <body>
  <%
  String uname=(String)session.getAttribute("uname");
  //如果他是空，说明没登陆，直接访问该页面了
  if(uname==null)
      response.sendRedirect("index.jsp");
   %>
    欢迎您<br>
  <a href="n.jsp">退出登录</a> <br>
 </body>

　　

<body bgcolor=#green>
    <h1>登陆失败</h1>
    <%response.setHeader("refresh", "5;url=login.jsp");%>
  </body>

　　

<body>
    <%
        session.invalidate();
        response.setHeader("refresh", "5;url=login.jsp");
    %>
    <h1>退出成功</h1>
</body>

　　

 

 

 

posted @ 2022-04-24 12:29  陈华涛  阅读(22)  评论(0)    收藏  举报