ASPX验证码生成程序(C#代码一个页面实现)
2009-12-30 15:48
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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.Design;
using
System.Drawing;
public partial class admin_yzm : System.Web.UI.Page
{
protected
void Page_Load(object sender, EventArgs e)
{
this.CreateCheckCodeImage(RndNum());
}
private string RndNum()
{
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();
}
Response.Cookies.Add(new
HttpCookie("checkcode", checkCode));
return checkCode;
}
private void CreateCheckCodeImage(string checkCode)
{
if (checkCode == null || checkCode.Trim() == String.Empty)
return;
System.Drawing.Bitmap image = new
System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 12.5)),
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);
Response.ClearContent();
Response.ContentType =
"image/Gif";
Response.BinaryWrite(ms.ToArray());
}
finally
{
g.Dispose();
image.Dispose();
}
}
}
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.Design;
using
System.Drawing;
public partial class admin_yzm : System.Web.UI.Page
{
protected
void Page_Load(object sender, EventArgs e)
{
this.CreateCheckCodeImage(RndNum());
}
private string RndNum()
{
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();
}
Response.Cookies.Add(new
HttpCookie("checkcode", checkCode));
return checkCode;
}
private void CreateCheckCodeImage(string checkCode)
{
if (checkCode == null || checkCode.Trim() == String.Empty)
return;
System.Drawing.Bitmap image = new
System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 12.5)),
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);
Response.ClearContent();
Response.ContentType =
"image/Gif";
Response.BinaryWrite(ms.ToArray());
}
finally
{
g.Dispose();
image.Dispose();
}
}
}
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