<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<style>
.a
{
width:390px;
height:290px;
background-color:#CCC;
margin-left:400px;
margin-top:10px;
}
.b{ width :390px;
height:55px;
background-color:#03C;
margin-left:0px;
margin-top:0px;
position:relative;
line-height:55px;text-align:center
}
.c{ line-height:40px;text-align:center
}
</style>
</head>
<body>
<div class="a">
<div class="b"><font color="#FFFFFF" >银行登入系统</font>
<form action="A.jsp"method="post">
用户名：
<input type="text" name="name" placeholder="请输入用名户名"style=" width:200px; height:40px"/><br>
密码：    
<input <input type="password"name="password" placeholder="请输入密码" style=" width:200px; height:40px"/><br><br>
<input type="submit" value="提交" style=" width:100px; height:40px"/>
</form>
</div>
</div>
</body>
</html>
<%@page import="java.sql.PreparedStatement"%>
<%@page import="java.sql.ResultSet"%>
<%@page import="java.sql.Statement"%>
<%@page import="java.sql.DriverManager"%>
<%@page import="java.sql.Connection"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<%
//访问数据库
try
{
Class.forName("oracle.jdbc.driver.OracleDriver");
Connection conn=DriverManager.getConnection("jdbc:oracle:thin:@127.0.0.1:1521:orcl",
"test0816", "123456");
String sql="select * from ATM where name=? and password=?";
PreparedStatement ps= conn.prepareStatement(sql);
ps.setString(1, "name");
ps.setString(1, "password");
ResultSet rs = ps.executeQuery();
if(rs.next())
{
out.write("登入成功");
}
else
{
out.write("登入失败");
}
}
catch(Exception e)
{
e.printStackTrace();
}
%>
<br>
<%
String name =request.getParameter("name");
//字符集转码
name=new String (name.getBytes("ISO-8859-1"),"UTF-8");
String password =request.getParameter("password");
out.write("用户名："+name+"<br>");
out.write("密码："+password);
if(name.equals("张三"))
{
if(password.equals("123456"))
{
%>
<!-- 账号密码正确跳转登陆页面-->
<jsp:forward page="success.jsp"></jsp:forward>
<%
}
else
{
%>
<!-- 账号正确密码错误跳转密码错误提示页面 -->
<jsp:forward page="failPassword.jsp"></jsp:forward>
<%
}
}
else
{
%>
<!-- 账号错误跳转账号错误提示页面 -->
<jsp:forward page="failName.jsp"></jsp:forward>
<%
}
%>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
跳转登入成功的页面......<br>
登入成功！
</body>
</html>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
用户名输入错误或不存在的页面<br>
用户名不存在！
</body>
</html>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
密码输入错误跳转页面。。。。<br>
密码错误！
</body>
</html>
原文：http://www.cnblogs.com/liuyanzeng/p/6009407.html