一.登录界面
建立登录文件夹Login，在此目录下面建立如下文件：
Index.htm:登录页面
ValidateCode.cs:生成验证码
ProcessVerification.ashx:处理验证码
CommonHelper.cs:帮助处理类
Login.ashx:处理登录
Index.htm:登录页面
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>XX后台管理系统登录</title>
<link href="../css/StyleHouTai.css" rel="stylesheet" />
<script type="text/javascript">
if (window.parent.window != window) {
window.top.location.href = "/Home/CheckLogin";
}
</script>
<script src="../script/jquery-1.8.3.js" type="text/javascript"></script>
<script src="../script/jquery.unobtrusive-ajax.min.js" type="text/javascript"></script>
<script type="text/javascript">
function changeCheckCode() {
$("#img").attr("src",$("#img").attr("src")+1);
}
function afterLogin(data) {
var serverData = data.split(‘:‘);
if (serverData[0] == "ok") {
window.location.href = "/Home/Index";
} else if (serverData[0] == "no") {
$("#errorMsg").text(serverData[1]);
changeCheckCode();
} else {
$("#errorMsg").text("系统繁忙");
}
}
function blurCode(id,idErr,errCode) {
$(id).blur(function () {
var loginCode = $(id).val();
//因js不支持trim()函数，需要使用此函数时添加以下语句
//String.prototype.trim = function () { return this.replace(/(^\s*)|(\s*$)/g, ""); }
//if (loginCode.trim().length <= 0) {
if ($.trim(loginCode).length <= 0) {
$(idErr).text(errCode);
return;
}
else {
$(idErr).text("");
}
});
}
$(function () {
blurCode(‘#LoginCode‘, ‘#LoginCodeErr‘, ‘请输入账号‘);
blurCode(‘#LoginPwd‘, ‘#LoginPwdErr‘, ‘请输入密码‘);
blurCode(‘#code‘, ‘#codeErr‘, ‘请输入验证码‘);
});
// $(‘#btnLogin‘).click(function () {
// var loginCode = $("#LoginCode").val();
// var loginPwd = $("#LoginPwd").val();
// if (loginCode.length <= 0) {
// alert("请输入账号");
// }
// $("#errorMsg").text("登录失败");
// changeCheckCode();
// });
/*
$(function () {
$(‘#LoginCode‘).blur(function () {
var loginCode = $("#LoginCode").val();
if (loginCode.trim().length <= 0) {
$("#LoginCodeErr").text("请输入账号");
}
else {
$("#LoginCodeErr").text("");
}
});
$(‘#LoginPwd‘).blur(function () {
var loginPwd = $("#LoginPwd").val();
if (loginPwd.trim().length <= 0) {
$("#LoginPwdErr").text("请输入密码");
}
else {
$("#LoginPwdErr").text("");
}
});
$(‘#code‘).blur(function () {
var code = $("#code").val();
if (code.trim().length <= 0) {
$("#codeErr").text("请输入验证码");
}
else {
$("#codeErr").text("");
}
});
});*/
</script>
</head>
<body style="padding: 10px">
<div id="login">
<div id="loginlogo">
</div>
<div id="loginpanel">
<div class="panel-h">
</div>
<div class="panel-c">
<div class="panel-c-l">
<form action="Login.ashx" method="post">
<table cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td align="left" colspan="2">
<h3>请使用XX系统账号登录</h3>
</td>
</tr>
<tr>
<td align="right">账号：</td>
<td align="left">
<input type="text" style="width:150px" name="LoginCode" id="LoginCode" class="login-text" />
<span id="LoginCodeErr" style="color:Red"></span>
</td>
</tr>
<tr>
<td align="right">
密码：
</td>
<td align="left">
<input type="password" style="width:150px" name="LoginPwd" id="LoginPwd" value="" class="login-text" />
<span id="LoginPwdErr" style="color:Red"></span>
</td>
</tr>
<tr>
<td>
验证码：
</td>
<td align="left">
<input type="text" style="width:150px" class="login-text" id="code" name="vCode" value="" />
<span id="codeErr" style="color:Red"></span>
</td>
</tr>
<tr>
<td>
</td>
<td>
<img id="img" src="ProcessVerification.ashx?id=1" style="float: left; height: 24px;" />
<div style="float: left; margin-left: 5px; margin-top: 10px;">
<a href="javascript:void(0)" onclick="changeCheckCode();return false;">看不清，换一张</a>
</div>
</td>
</tr>
<tr>
<td align="center" colspan="2">
<input type="submit" name="btnLogin" id="btnLogin" value="登录" class="login-btn" />
<span id="errorMsg"></span>
</td>
</tr>
</tbody>
</table>
</form>
</div>
<div class="panel-c-r">
<p>
请从左侧输入登录账号和密码登录</p>
<p>
如果遇到系统问题，请联系网络管理员。</p>
<p>
如果没有账号，请联系网站管理员。
</p>
<p>
......</p>
</div>
</div>
<div class="panel-f">
</div>
</div>
<div id="logincopyright">
Copyright 2015 www.syfpc.com
</div>
</div>
</body>
</html>
ValidateCode.cs:生成验证码
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Web;
namespace modelInput
{
public class ValidateCode
{
public ValidateCode()
{
}
/// <summary>
/// 验证码的最大长度
/// </summary>
public int MaxLength
{
get { return 10; }
}
/// <summary>
/// 验证码的最小长度
/// </summary>
public int MinLength
{
get { return 1; }
}
/// <summary>
/// 生成验证码
/// </summary>
/// <param name="length">指定验证码的长度</param>
/// <returns></returns>
public string CreateValidateCode(int length)
{
int[] randMembers = new int[length];
int[] validateNums = new int[length];
string validateNumberStr = "";
//生成起始序列值
int seekSeek = unchecked((int)DateTime.Now.Ticks);
Random seekRand = new Random(seekSeek);
int beginSeek = (int)seekRand.Next(0, Int32.MaxValue - length * 10000);
int[] seeks = new int[length];
for (int i = 0; i < length; i++)
{
beginSeek += 10000;
seeks[i] = beginSeek;
}
//生成随机数字
for (int i = 0; i < length; i++)
{
Random rand = new Random(seeks[i]);
int pownum = 1 * (int)Math.Pow(10, length);
randMembers[i] = rand.Next(pownum, Int32.MaxValue);
}
//抽取随机数字
for (int i = 0; i < length; i++)
{
string numStr = randMembers[i].ToString();
int numLength = numStr.Length;
Random rand = new Random();
int numPosition = rand.Next(0, numLength - 1);
validateNums[i] = Int32.Parse(numStr.Substring(numPosition, 1));
}
//生成验证码
for (int i = 0; i < length; i++)
{
validateNumberStr += validateNums[i].ToString();
}
return validateNumberStr;
}
/// <summary>
/// 创建验证码的图片
/// </summary>
/// <param name="context">要输出到的page对象</param>
/// <param name="validateNum">验证码</param>
public void CreateValidateGraphic(string validateCode, HttpContext context)
{
Bitmap image = new Bitmap((int)Math.Ceiling(validateCode.Length * 12.0), 22);
Graphics g = Graphics.FromImage(image);
try
{
//生成随机生成器
Random random = new Random();
//清空图片背景色
g.Clear(Color.White);
//画图片的干扰线
for (int i = 0; i < 25; i++)
{
int x1 = random.Next(image.Width);
int x2 = random.Next(image.Width);
int y1 = random.Next(image.Height);
int y2 = random.Next(image.Height);
g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
}
Font font = new Font("Arial", 12, (FontStyle.Bold | FontStyle.Italic));
LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height),
Color.Blue, Color.DarkRed, 1.2f, true);
g.DrawString(validateCode, font, brush, 3, 2);
//画图片的前景干扰点
for (int i = 0; i < 100; i++)
{
int x = random.Next(image.Width);
int y = random.Next(image.Height);
image.SetPixel(x, y, Color.FromArgb(random.Next()));
}
//画图片的边框线
g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);
//保存图片数据
MemoryStream stream = new MemoryStream();
image.Save(stream, ImageFormat.Jpeg);
//输出图片流
context.Response.Clear();
context.Response.ContentType = "image/jpeg";
context.Response.BinaryWrite(stream.ToArray());
}
finally
{
g.Dispose();
image.Dispose();
}
}
/// <summary>
/// 得到验证码图片的长度
/// </summary>
/// <param name="validateNumLength">验证码的长度</param>
/// <returns></returns>
public static int GetImageWidth(int validateNumLength)
{
return (int)(validateNumLength * 12.0);
}
/// <summary>
/// 得到验证码的高度
/// </summary>
/// <returns></returns>
public static double GetImageHeight()
{
return 22.5;
}
//C# MVC 升级版
/// <summary>
/// 创建验证码的图片
/// </summary>
/// <param name="containsPage">要输出到的page对象</param>
/// <param name="validateNum">验证码</param>
public byte[] CreateValidateGraphic(string validateCode)
{
Bitmap image = new Bitmap((int)Math.Ceiling(validateCode.Length * 12.0), 22);
Graphics g = Graphics.FromImage(image);
try
{
//生成随机生成器
Random random = new Random();
//清空图片背景色
g.Clear(Color.White);
//画图片的干扰线
for (int i = 0; i < 25; i++)
{
int x1 = random.Next(image.Width);
int x2 = random.Next(image.Width);
int y1 = random.Next(image.Height);
int y2 = random.Next(image.Height);
g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
}
Font font = new Font("Arial", 12, (FontStyle.Bold | FontStyle.Italic));
LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height),
Color.Blue, Color.DarkRed, 1.2f, true);
g.DrawString(validateCode, font, brush, 3, 2);
//画图片的前景干扰点
for (int i = 0; i < 100; i++)
{
int x = random.Next(image.Width);
int y = random.Next(image.Height);
image.SetPixel(x, y, Color.FromArgb(random.Next()));
}
//画图片的边框线
g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);
//保存图片数据
MemoryStream stream = new MemoryStream();
image.Save(stream, ImageFormat.Jpeg);
//输出图片流
return stream.ToArray();
}
finally
{
g.Dispose();
image.Dispose();
}
}
}
}
ProcessVerification.ashx:处理验证码
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using modelInput;
using System.Drawing;
using System.Drawing.Imaging;
namespace XX管理系统.Login
{
/// <summary>
/// ProcessVerification 的摘要说明
/// </summary>
public class ProcessVerification : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "image/jpeg";
ValidateCode validateCode = new ValidateCode();
string code = validateCode.CreateValidateCode(4);
//创建cookie对象
HttpCookie cookie = new HttpCookie("vCode");
//将cookie值等于自动生成的验证码
cookie.Value = code;
//更新cookie值
context.Response.SetCookie(cookie);
using (Bitmap bmp = new Bitmap(100, 50))//创建一个尺寸为500*500的内存图片
using (Graphics g = Graphics.FromImage(bmp))//得到图片的画布
{
g.DrawString(code, new Font(FontFamily.GenericSerif, 30), Brushes.Red, 0, 0);//Font应该被释放
bmp.Save(context.Response.OutputStream, ImageFormat.Jpeg);//图片保存到输出流
}
}
public bool IsReusable
{
get
{
return false;
}
}
}
}
CommonHelper.cs:帮助处理类
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.IO;
namespace XX管理系统
{
public class CommonHelper
{
/// <summary>
/// 返回HTML文件内容
/// </summary>
/// <param name="fileName">HTML文件</param>
/// <returns></returns>
public static string ReadHtml(string fileName)
{
HttpContext context = HttpContext.Current;
string fullpath = context.Server.MapPath(fileName);
string html = File.ReadAllText(fullpath);
return html;
}
}
}
Login.ashx:处理登录
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/html";
//LoginCode,LoginPwd,
string loginCode = context.Request["LoginCode"];//用户名
string loginPwd = context.Request["LoginPwd"];//密码
string vCode = context.Request["vCode"];//验证码
//获取客户端的cookie值
HttpCookie cookie = context.Request.Cookies["vCode"];
if (cookie == null)
{
context.Response.Write("找不到系统生成的验证码");
context.Response.Redirect("Index.htm");
return;
}
if (vCode != cookie.Value)
{
context.Response.Write("验证码错误");
context.Response.Redirect("Index.htm");
return;
}
int r = (int)SQLHelper.ExecuteScalar("select count(*) from Users where [email protected] and [email protected]",
new SqlParameter { ParameterName = "@loginCode", Value = loginCode },
new SqlParameter { ParameterName = "@loginPwd",Value=loginPwd });
if (r == 1)
{
context.Response.Redirect("../Home.htm");
}
}
时间： 2024-08-24 11:34:19