<%@ 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>
<base href="<%=basePath%>">
<title>My JSP 'login.jsp' starting page</title>
<html>
<head>
<title>登录页面</title>
<style type="text/css">
body{font-size: 16px;}
</style>
<script type="text/javascript">
function mycheck() {
//判断用户名是否为空
if (form1.userName.value==""){
alert("用户名不能为空，请输入用户名！");
form1.userName.focus();
return;
}
//判断密码是否为空
if (form1.password.value=="") {
alert("密码不能为空，请输入密码！");
form1.password.focus();
return;
}
//判断验证码是否为空
if (form1.validationCode.value==""){
alert("验证码不能为空，请输入验证码!");
form1.validationCode.focus();
return;
}
//判断验证码是否正确
if (form1.validationCode.value != form1.validationCode1.value) {
alert("请输入正确的验证码!!");
form1.validationCode.focus();
return;
}
form1.submit1();
}
</script>
</head>
<body bgcolor="pink">
<form action="loginCheck.jsp" name="form1" method="post">
用户名：<input type="text" name="userName" size="16">
<br> 密 码：
<input type="password" name="password" size="18">
<br>
验证码：<input type="text" name="validationCode"
onKeyDown="if(event.keyCode==13){form1.submit.focus();}" size="6">
<%
int intmethod1 = (int) ((((Math.random()) * 11)) - 1);
int intmethod2 = (int) ((((Math.random()) * 11)) - 1);
int intmethod3 = (int) ((((Math.random()) * 11)) - 1);
int intmethod4 = (int) ((((Math.random()) * 11)) - 1);
//将得到的随机数进行连接
String intsum = intmethod1 +""+ intmethod2+intmethod3+intmethod4;
%>
<!-- 设置隐藏域,验证比较时使用-->
<input type="hidden" name="validationCode1"
value="<%=intsum%>">
<!-- 将图片名称与得到的随机数相同的图片显示在页面上 -->
<img src="<%=intmethod1%>.png">
<img src="<%=intmethod2%>.png">
<img src="<%=intmethod3%>.png">
<img src="<%=intmethod4%>.png">
<br>
<input type="submit" name="submit1" value="登录"
onClick="mycheck()">
<input type="reset" value="重置">
</form>
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<html>
<head>
<title>处理登录页面的数据</title>
</head>
<body bgcolor="pink">
<%
//设置请求的编码，用于解决中文乱码问题
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("lixiang")&&(password.equals("666666"))){
//把用户名到session中
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"%>
<%
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>
<base href="<%=basePath%>">
<title>My JSP 'main.jsp' starting page</title>
<html>
<head>
<title>系统主页面</title>
</head>
<body bgcolor="pink">
<%
//获取保存在session中的用户名
String name=(String)session.getAttribute("userName");
%>
您好<%=name%>,欢迎您访问！<br>
<a href="exit.jsp">[退出系统]</a>
</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>
<base href="<%=basePath%>">
<title>My JSP 'exit.jsp' starting page</title>
<html>
<head>
<title>退出系统</title>
</head>
<body>
<%
session.invalidate();//销毁session
response.sendRedirect("login.jsp");
%>
</body>
</html>
