新闻的登录验证代码
<%@page import="java.sql.ResultSet"%>
<%@page import="java.sql.PreparedStatement"%>
<%@page import="java.sql.DriverManager"%>
<%@page import="java.sql.Connection"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%
String uname = request.getParameter("textfield");
String upwd = request.getParameter("textfield2");
Class.forName("oracle.jdbc.driver.OracleDriver");
String url = "jdbc:oracle:thin:@localhost:1521:T277";
Connection con = DriverManager.getConnection(url, "scott", "tiger");
PreparedStatement ps = con.prepareStatement("select * from users where uname=? and upwd=?");
ps.setString(1, uname);
ps.setString(2, upwd);
ResultSet rs = ps.executeQuery();
if(rs.next()){
request.getRequestDispatcher("admin.jsp").forward(request, response);
}else{
out.print("<script>alert('用户名或密码错误,请重新登录');location.href='login.jsp'</script>");
}
下面是新闻的登录窗体
<%@ 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>用户登录</title>
<link href="images/login.css" rel="stylesheet" type="text/css" />
<script type="text/javascript">
var str = "qwertyupasdfghjkzxcvbnmQWERTYUPASDFGHJKLZXCVBNM23456789";
function yz() {
//随机出4个0-字符串长度之间的数字 做为下标
yzmStr="";
for(var i=1;i<=4;i++){
yzmStr+=str.substr(Math.round(Math.random()*(str.length-1)),1);
}
//把验证码赋值到页面
document.getElementById("syzm").innerHTML=yzmStr;
}
function $(id) {
return document.getElementById(id);
}
function login_yz() {
//验证 用户名 和 密码不能为空
//获取用户名
var uname = $("uname").value;
if(uname.length==0){
alert("用户名不能为空");
return false;
}
//获取密码
var upwd = $("upwd").value;
if(upwd.length==0){
alert("密码不能为空");
return false;
}
//获取验证码:判断和电脑的验证码是否相等
//PS：自己实现-输入的验证码不区分大小写-大小写转换
var yzm = $("uyzm").value;
if(yzm!=yzmStr){
alert("验证码输入错误，请重新输入");
//清空输入的验证码
$("uyzm").value="";
//重新生成验证码
yz();
return false;
}
}
</script>
</head>
<body οnlοad="yz()">
<div id="login">
<div id="top">
<div id="top_left">
<img src="images/login_03.gif" />
</div>
<div id="top_center"></div>
</div>
<div id="center">
<div id="center_left"></div>
<div id="center_middle">
<form action="dologin.jsp" οnsubmit="return login_yz()">
<div id="user">
用 户 <input type="text" id="uname" name="textfield" />
</div>
<div id="password">
密 码 <input type="password" id="upwd" name="textfield2" />
</div>
<div id="yz" >
验证码 <input id="uyzm" style="width: 50px;" type="text" name="textfield3" />
<span id="syzm" οnclick="yz()"></span>
</div>
<div id="bt">
<input type="submit" value="登录">
<input type="reset" value="清空">
</div>
</form>
</div>
<div id="center_right"></div>
</div>
<div id="down">
<div id="down_left">
<div id="inf">
<span class="inf_text">版本信息</span> <span class="copyright">管理信息系统
2008 v2.0</span>
</div>
</div>
<div id="down_center"></div>
</div>
</div>
</body>
</html>
