JSP第六周 还是session
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<script type="text/javascript">
function myCheck(){
if(form1.username.value==""){
alert("账号不能为空");
form1.username.focus();
return;
}
if(form1.username.value!="admin"){
alert("账号输入错误");
form1.username.focus();
return;
}
if(form1.pwd.value==""){
alert("密码不能为空");
form1.pwd.focus();
return;
}
if(form1.pwd.value!="123456"){
alert("密码输入错误");
form1.pwd.focus();
return;
}
if(form1.yzm.value==""){
alert("验证码不能为空");
form1.yzm.focus();
return;
}
if(form1.yzm.value!=form1.mlgb.value){
alert("请输入正确的验证码");
form1.yzm.focus();
return;
}
form1.submit1();
}
</script>
</head>
<body>
<form action="sf7.jsp" method="post" name="form1">
用户名:<input type="text" name="username" ><br><br>
密 码:<input type="password" name="pwd"><br><br>
验证码:<input type="password" name="yzm" size="6"> <br><br>
<%
//产生随机数并连接
int yzm1=(int) ( ( (Math.random())*11 ) -1 );
int yzm2=(int) ( ( (Math.random())*11 ) -1 );
int yzm3=(int) ( ( (Math.random())*11 ) -1 );
int yzm4=(int) ( ( (Math.random())*11 ) -1 );
String yzmSum=yzm1+""+yzm2+yzm3+yzm4;
%>
<!-- 设置隐藏域 验证时候比较 -->
<input type="hidden" name="mlgb" value=<%=yzmSum %>>
<img src="img/<%=yzm1%>.gif">
<img src="img/<%=yzm2%>.gif">
<img src="img/<%=yzm3%>.gif">
<img src="img/<%=yzm4%>.gif">
<hr>
<input type="submit" value="登录" name="submit1" onClick="myCheck()">
<input type="reset" value="重置">
</form>
</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 username=request.getParameter("username");
session.setAttribute("username", username);
String pwd=request.getParameter("pwd");
String yzm=request.getParameter("yzm");
String mlgb=request.getParameter("mlgb");
if( username.equals("admin")&&pwd.equals("123456")&&yzm.equals(mlgb) ){
request.getRequestDispatcher("main.jsp").forward(request, response);
}else{
response.sendRedirect("sf6.jsp");
}
%>
</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 username=(String)session.getAttribute("username");
%>
<%=username %> 欢迎你来到 CCTV <br><br>
<hr>
<a href="exit.jsp">退出系统</a>
<% %>
</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>
<% session.invalidate();
response.sendRedirect("sf6.jsp") ;
%>
</body>
</html>
