jsp sixth homework

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<html>
<head>
<title>登录页面</title>
<style type="text/css">
body {
    font-size: 16px;
}
</style>

<script type="text/javascript">
    function mycheck () {
         if (form1.userName.value ==  "" ) { 
            alert ( " Username cannot be empty, please enter a username! " ); 
            form1.userName.focus (); 
            return ; 
        } 
        if (form1. password.value ==  "" ) { 
            alert ( "The password cannot be empty, please enter the password! " ); 
            form1.password.focus (); 
            return ; 
        } 
        if (form1.validationCode.value ==  "" ) { 
            alert ( "The verification code cannot be empty, please enter the verification code!");
            form1.validationCode.focus();
            return;
        }
        if (form1.validationCode.value != form1.validationCode1.value) {
            alert("请输入正确的验证码!");
            form1.validationCode.focus();
            return;
        }
    }
</script>

</head>

<body bgcolor="pink">

    <form action="loginCheck.jsp" name="form1" method="post">
        username:<input type="text" name="userName" size="16"> <br>
        密&nbsp;&nbsp;&nbsp;码： <input type="password" name="password"
            size="16"> <br> 验证码：<input type="text"
            name="validationCode"
            onKeyDown="if(event.keyCode==13){form1.submit.focus();}" size="6">

        <%
            int intmethod1 =( int ) (Math.random () *  10 );
             int intmethod2 = ( int ) (Math.random () *  10 );
             int intmethod3 = ( int ) (Math.random () *  10 );
             int intmethod4 = ( int ) (Math.random () *  10 );
             // Connect the obtained random number 
             String intsum = intmethod1 +  ""  + intmethod2 + intmethod3
                    + intmethod4;
        %>

        <input type="hidden" name="validationCode1" value="<%=intsum%>">
        <img src="image/<%=intmethod1%>.jpg"> <img
            src="image/<%=intmethod2%>.jpg"> <img
            src="image/<%=intmethod3%>.jpg"> <img
            src="image/<%=intmethod4%>.jpg"> <br> <input type="submit"
            name="submit" value="登录" onfocus="mycheck()"> &nbsp;&nbsp;&nbsp; <input
            type="reset" value="重置">
    </form>

</body>

</html>

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

<head>

<title>处理登录页面的数据</title>
</head>

<body bgcolor="pink">

    <%
        request.setCharacterEncoding("UTF-8");
        String name = request.getParameter("userName");
        String password = request.getParameter("password");
        if (request.getParameter("validationCode1").equals(
                request.getParameter("validationCode"))) {
            if (name.equals("xinfeng") && (password.equals("981107"))) {
                session.setAttribute("userName", name);
                response.sendRedirect("main.jsp");
            } else {
                response.sendRedirect("login.jsp");
            }
        } else {
            response.sendRedirect("login.jsp");
        }
    %>

</body>

</html>

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

<head>

<title>系统主页面</title>
</head>

<body bgcolor="pink">

    <%
        Object name = session.getAttribute("userName");
        String name1 =( String ) name;
     %> 
    Hello <% = name1 %> , welcome you to visit!
    < Br > 
    < A the href = "the Exit.jsp" > [Exit System] </ A > 
</ body > 

</ HTML >

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<html>
<head>
<title>退出系统</title>
</head>
<body>
    <%
        session.invalidate();
        response.sendRedirect("login.jsp");
    %>
</body>
</html>

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