.net 环境下带加减法的验证码
ValidCode.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Drawing;
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//from http://i.aspx1.com
public partial class Admin_ValidCode : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
this.CreateCheckCodeImage(GenerateCheckCode());
}
private string GenerateCheckCode()
{
int intFirst, intSec, intTemp;
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string checkCode = String.Empty;
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System.Random random = new Random();
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intFirst = random.Next(1, 10);
intSec = random.Next(1, 10);
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switch (random.Next(1, 3).ToString())
{
case "2":
if (intFirst < intSec)
{
intTemp = intFirst;
intFirst = intSec;
intSec = intTemp;
}
checkCode = "=" + intFirst + "-" + intSec;
Session["ValidCode"] = intFirst - intSec;
break;
default:
checkCode = "=" + intFirst + "+" + intSec;
Session["ValidCode"] = intFirst + intSec;
break;
}
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//Response.Cookies.Add(new HttpCookie("ValidCode",Movie.Common.AES.EncryptAes(checkCode)));
return checkCode;
}
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产生波形滤镜效果
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private void CreateCheckCodeImage(string checkCode)
{
if (checkCode == null || checkCode.Trim() == String.Empty)
return;
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System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 15.0)), 25);
Graphics g = Graphics.FromImage(image);
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try
{
//生成随机生成器
Random random = new Random();
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//清空图片背景色
g.Clear(Color.White);
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//画图片的背景噪音线
for (int i = 0; i < 12; 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);
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g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
}
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Font font = new System.Drawing.Font("Arial", 16, (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, 1, 1);
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//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);
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// image.SetPixel(x, y, Color.FromArgb(random.Next()));
//}
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//image = TwistImage(image, true, 3, 1);//画图片的波形滤镜效果
//画图片的边框线
g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);
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System.IO.MemoryStream ms = new System.IO.MemoryStream();
image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
Response.ClearContent();
Response.ContentType = "image/Gif";
Response.BinaryWrite(ms.ToArray());
}
finally
{
g.Dispose();
image.Dispose();
}
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}
}
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