VS2005中验证码生成页

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="code.aspx.cs" Inherits="code" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<title>鏃犳爣棰橀〉</title>

</head>

<body>

<div>

</div>

</form>

</body>

</html>

using System;

using System.Collections;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Drawing.Imaging;

using System.Web;

using System.Web.SessionState;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.HtmlControls;

/// <summary>

/// code 验证码生成页

/// </summary>

public partial class code : System.Web.UI.Page

{

// 验证码长度

private int codeLen = 8;

// 图片清晰度

private int fineness = 80;

// 图片宽度

private int imgWidth = 128;

// 图片高度

private int imgHeight = 24;

// 字体家族名称

private string fontFamily = "Times New Roman";

// 字体大小

private int fontSize = 14;

// 字体样式

private int fontStyle = 0;

// 绘制起始坐标 X

private int posX = 0;

// 绘制起始坐标 Y

private int posY = 0;

//------------------------------------------------------------

// code.aspx 页面加载函数

//------------------------------------------------------------

private void Page_Load(object sender, System.EventArgs e)

{

读取 Request 传递参数

string code = Createcode();

// 生成BITMAP图像

Bitmap bitmap = new Bitmap(imgWidth, imgHeight);

// 给图像设置干扰

DisturbBitmap(bitmap);

// 绘制验证码图像

Drawcode(bitmap, code);

// 保存验证码图像，等待输出

bitmap.Save(Response.OutputStream, ImageFormat.Gif);

}

//------------------------------------------------------------

// 随机生成验证码，并保存到SESSION中

//------------------------------------------------------------

private string Createcode()

{

string code = "";

// 随机数对象

Random random = new Random();

for (int i = 0; i < codeLen; i++)

{

// 26: a - z

int n = random.Next(26);

// 将数字转换成大写字母

code += (char)(n + 65);

}

// 保存验证码

Session["code"] = code;

return code;

}

//------------------------------------------------------------

// 为图片设置干扰点

//------------------------------------------------------------

private void DisturbBitmap(Bitmap bitmap)

{

// 通过随机数生成

Random random = new Random();

for (int i = 0; i < bitmap.Width; i++)

{

for (int j = 0; j < bitmap.Height; j++)

{

if (random.Next(100) <= this.fineness)

bitmap.SetPixel(i, j, Color.White);

}

//------------------------------------------------------------

// 绘制验证码图片

//------------------------------------------------------------

private void Drawcode(Bitmap bitmap, string code)

{

// 获取绘制器对象

Graphics g = Graphics.FromImage(bitmap);

// 设置绘制字体

Font font = new Font(fontFamily, fontSize, GetFontStyle());

Pen myPen = new Pen(Color.Black,2);

//随机画两条线

Random r = new Random();

float x1 = r.Next(imgWidth);

float x2 = r.Next(imgWidth) ;

float y1 = r.Next(imgHeight);

float y2 = r.Next(imgHeight);

g.DrawLine(myPen, x1, y1, x2, y2);

x1 = r.Next(imgWidth );

x2 = r.Next(imgWidth);

y1 = r.Next(imgHeight);

y2 = r.Next(imgHeight);

g.DrawLine(myPen, x1, y1, x2, y2);

// 绘制验证码图像

g.DrawString(code, font, Brushes.Black, posX, posY);

}

//------------------------------------------------------------

// 换算验证码字体样式：1 粗体 2 斜体 3 粗斜体，默认为普通字体

//------------------------------------------------------------

private FontStyle GetFontStyle()

{

if (fontStyle == 1)

return FontStyle.Bold;

else if (fontStyle == 2)

return FontStyle.Italic;

else if (fontStyle == 3)

return FontStyle.Bold | FontStyle.Italic;

else

return FontStyle.Regular;

}

posted on 2007-02-25 13:20 mbskys 阅读(242) 评论(0) 收藏举报