君仙小一时的登录图片验证码
Login控制器：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
namespace WebApplication1.Controllers
{
public class LoginController : Controller
{
// GET: Login
public ActionResult Index()
{
return View();
}
/// <summary>
/// 验证码的校验
/// </summary>
/// <param name="context"></param>
/// <returns></returns>
public ActionResult CheckCode()
{
//生成验证码
ValidateCode validateCode = new ValidateCode();
string code = validateCode.CreateValidateCode(4);
Session["ValidateCode"] = code;
byte[] bytes = validateCode.CreateValidateGraphic(code);
return File(bytes, @"image/jpeg");
}
/// <summary>
/// 验证验证码是否正确
/// </summary>
/// <param name="num"></param>
/// <returns></returns>
public bool CheckValidateCode(string num)
{
string cnum = Session["ValidateCode"] == null ? "" : Session["ValidateCode"].ToString();
if (num == cnum && !string.IsNullOrEmpty(num))
{
return true;
}
else
{
return false;
}
}
/// <summary>
/// 登录页面
/// </summary>
/// <returns></returns>
public ActionResult Login()
{
return View();
}
/// <summary>
/// 登录验证方法
/// </summary>
/// <param name="Info">info为存用户的实体,把用户信息与验证信息一起提交到这个方法里</param>
/// <returns></returns>
[HttpPost]
public ActionResult Login(UserInfo Info)
{
///Info.Str前段传入的验证字符串用CheckValidateCode()进行验证
if (!CheckValidateCode(Info.Str))
{
return Content("<script>javascript:alert('验证码输入不正确');location.href='/Login/Login';</script>");
}
///写个假的用户信息
if (Info.UserName=="张三"&&Info.PassWord=="111")
{
return Content("<script>javascript:alert('登录成功');location.href='/Login/Index';</script>");
}
else
{
return Content("<script>javascript:alert('登录失败');location.href='/Login/Login';</script>");
}
}
}
}
ValidateCode控制器：
using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;
namespace WebApplication1.Controllers
{
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;
}
//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();
}
}
/// <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;
}
}
}
前台登录页面：
@{
ViewBag.Title = "Login";
}
<h2>Login</h2>
<script>
function ClickRemoveChangeCode() {
var code = $("#imgCode").attr("src");
$("#imgCode").attr("src", code + "1");
}
</script>
@using (Html.BeginForm("Login", "Login", "post"))
{
<table class="table active">
<tr>
<td>
用户名
</td>
<td>
<input type="text" name="UserName" value="" />
</td>
</tr>
<tr>
<td>
密码
</td>
<td>
<input type="text" name="PassWord" value="" />
</td>
</tr>
<tr>
<td>
验证码
</td>
<td>
<input type="text" name="Str" value="" />
</td>
</tr>
<tr>
<td>验证码：</td>
<td>
<img src="/Login/CheckCode?ID=1" id="imgCode" alt="单击可刷新" onclick="ClickRemoveChangeCode()" />
<div style="float:right; margin-top: 5px;">
<a href="javascript:void(0)" onclick="ClickRemoveChangeCode();return false;">看不清，换一张</a>
</div>
</td>
</tr>
<tr>
<td colspan="2">
<input type="submit" value="登录" />
</td>
</tr>
</table>
}
希望这些代码对大家有帮助哦
