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>