.net 登录账号的验证码功能
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2024-01-24 20:07:52
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登录前端页面的登录模块如下图所示：
前端页面的代码如下：
<table width="380" height="450" border="0" cellpadding="0" cellspacing="0" style="border: 1px solid #B8CACB;">
<tr>
<th bgcolor="#F6F6F6" scope="row" style="color: #A7ABDC">
登录
</th>
</tr>
<tr>
<th bgcolor="#F6F6F6" scope="row">
<input id="txtAccount" runat="server" class="ipt" name="username" size="10" type="text"
style="vertical-align: middle" />
</th>
</tr>
<tr>
<th bgcolor="#F6F6F6" scope="row">
<input id="txtextAdminPassword" runat="server" class="ipt" name="password" size="10"
type="password" style="vertical-align: middle" />
</th>
</tr>
<tr>
<th bgcolor="#F6F6F6" scope="row">
<input id="txtValiCode" runat="server" class="ipt" name="authcode" size="10" type="text"
style="vertical-align: middle" />
<img alt="验证码" onclick="this.src='../imgCode.aspx?k='+Math.random()" src="../imgCode.aspx" style="margin-bottom: -10px; height: 30px" />
</th>
</tr>
<tr>
<th bgcolor="#F6F6F6" scope="row" style="text-align: center">
<asp:ImageButton ID="ImageButton1" runat="server" Height="35px" Width="300px" ImageUrl="Images/imgBtn.png"
OnClick="ImageButton1_Click" />
</th>
</tr>
<tr>
<th bgcolor="#F6F6F6" scope="row" style="text-align: center; color: Red; font-size: 14px; height:50px;">
<asp:Label ID="lblMessage" runat="server" Text=""></asp:Label>
</th>
</tr>
</table>
</td>
</tr>
</table>最重要的是<img alt="验证码" οnclick="this.src='../imgCode.aspx?k='+Math.random()" src="../imgCode.aspx" style="margin-bottom: -10px; height: 30px" />这段代码，生成的验证码图片存放在img标签中。
调用的imgCode.aspx页面的前端代码如下所示：只留下这开头的一行基础设置信息。
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="imgCode.aspx.cs" Inherits="AutomatedValuation.imgCode" %>imgCode.aspx页面的后端代码如下所示：
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace AutomatedValuation
{
public partial class imgCode : System.Web.UI.Page
{
protected override void OnPreInit(EventArgs e)
{
base.OnPreInit(e);
this.CreateCheckCodeImage(GenerateCheckCode(), this.Context);
}
/// <summary>
/// 产生随即数验证码并返回
/// </summary>
/// <returns></returns>
public string GenerateCheckCode()
{
int number;
char code;
string checkCode = String.Empty;
System.Random random = new Random();
for (int i = 0; i < 4; i++)
{
number = random.Next();
if (number % 2 == 0)
code = (char)('0' + (char)(number % 10));
else
code = (char)('A' + (char)(number % 26));
checkCode += code.ToString();
}
return checkCode;
}
/// <summary>
/// 生成图片
/// </summary>
/// <param name="checkCode"></param>
private void CreateCheckCodeImage(string checkCode, HttpContext hc)
{
if (checkCode == null || checkCode.Trim() == String.Empty)
return;
hc.Session["validateCode"] = checkCode;
hc.Session.Timeout = 600;
System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 14.0)), 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);
//画图片的背景噪音线
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 System.Drawing.Font("Arial", 12, (System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Italic));
System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true);
g.DrawString(checkCode, font, brush, 2, 2);
//画图片的前景噪音点
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);
System.IO.MemoryStream ms = new System.IO.MemoryStream();
image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
hc.Response.ClearContent();
hc.Response.ContentType = "image/Gif";
hc.Response.BinaryWrite(ms.ToArray());
hc.Response.End();
}
finally
{
g.Dispose();
image.Dispose();
}
}
}
}返回到登录界面的后端代码如下：
/// <summary>
/// 登录
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void ImageButton1_Click(object sender, ImageClickEventArgs e)
{
lblMessage.Visible = false;
if (string.IsNullOrEmpty(Session["validateCode"] + ""))
{
Request.Cookies.Clear();
Session.Clear();
Response.Redirect("Login.aspx");
}
if (Session["validateCode"].ToString().ToLower().Equals(this.txtValiCode.Value.ToLower()))
{
string userName = this.txtAccount.Value.Trim();
string password = this.txtextAdminPassword.Value.Trim();
UsersBLL ubll = new UsersBLL();//这里加上管理员用户的判断
var user = ubll.GetModel(userName);
int power = user.UserPower.GetValueOrDefault();
int level = user.UserLevel.GetValueOrDefault();
string permission = user.PermissionsJh.ToString();
if(user != null && user.UPassWord == password )//管理员权限为3
{
if (power == 3 && level == 3)
{
//登录成功
//Session["UserAccount"] = user.UserAccount;
//Session["UPassWord"] = user.UPassWord;
//Session["UserName"] = user.UserName;
//登录成功
Response.Cookies["UserAccount"].Value = HttpUtility.UrlEncode(user.UserAccount, Encoding.GetEncoding("UTF-8"));
Response.Cookies["UserID"].Value = HttpUtility.UrlEncode(user.UserID.ToString(), Encoding.GetEncoding("UTF-8"));
Response.Cookies["UserAccount"].Expires = DateTime.MaxValue;
Response.Cookies["UserID"].Expires = DateTime.MaxValue;
Response.Cookies["UserName"].Value = HttpUtility.UrlEncode(user.UserName.ToString(), Encoding.GetEncoding("UTF-8"));
Response.Cookies["UserName"].Expires = DateTime.MaxValue;
//跳转
Response.Redirect("xzxs.aspx");
}
else
{
lblMessage.Text = "账户或用户名不对，请重新输入";
lblMessage.Visible = true;
}
}
else
{
lblMessage.Text = "该账户不存在，请先注册";
lblMessage.Visible = true;
}
}
else
{
lblMessage.Text = "验证码错误";
lblMessage.Visible = true;
//Page.ClientScript.RegisterStartupScript(this.GetType(), "", "alert('验证码错误');", true);
}
}