VS2005中验证码生成页

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<%@ 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">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>鏃犳爣棰橀〉</title>
</head>
<body>
    <form id="form1" runat="server">
    <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)
        {
            #region 读取 Request 传递参数
            // 获取代码长度设置
            if (Request["CodeLen"] != null)
            {
                try
                {
                    codeLen = Int32.Parse(Request["CodeLen"]);

                    // 规定验证码长度
                    if (codeLen < 4 || codeLen > 16)
                        throw new Exception("验证码长度必须在4到16之间");
                }
                catch (Exception Ex)
                {
                    throw Ex;
                }
            }

            // 获取图片清晰度设置
            if (Request["Fineness"] != null)
            {
                try
                {
                    fineness = Int32.Parse(Request["Fineness"]);

                    // 验证清晰度
                    if (fineness < 0 || fineness > 100)
                        throw new Exception("图片清晰度必须在0到100之间");
                }
                catch (Exception Ex)
                {
                    throw Ex;
                }
            }

            // 获取图片宽度
            if (Request["ImgWidth"] != null)
            {
                try
                {
                    imgWidth = Int32.Parse(Request["ImgWidth"]);

                    if (imgWidth < 16 || imgWidth > 480)
                        throw new Exception("图片宽度必须在16到480之间");
                }
                catch (Exception Ex)
                {
                    throw Ex;
                }
            }

            // 获取图片高度
            if (Request["ImgHeight"] != null)
            {
                try
                {
                    imgHeight = Int32.Parse(Request["ImgHeight"]);

                    if (imgHeight < 16 || imgHeight > 320)
                        throw new Exception("图片高度必须在16到320之间");
                }
                catch (Exception Ex)
                {
                    throw Ex;
                }
            }

            // 获取验证码字体家族名称
            if (Request["FontFamily"] != null)
            {
                fontFamily = Request["FontFamily"];
            }

            // 获取验证码字体大小
            if (Request["FontSize"] != null)
            {
                try
                {
                    fontSize = Int32.Parse(Request["FontSize"]);

                    if (fontSize < 8 || fontSize > 72)
                        throw new Exception("字体大小必须在8到72之间");
                }
                catch (Exception Ex)
                {
                    throw Ex;
                }
            }

            // 获取字体样式
            if (Request["FontStyle"] != null)
            {
                try
                {
                    fontStyle = Int32.Parse(Request["FontStyle"]);
                }
                catch (Exception Ex)
                {
                    throw Ex;
                }
            }

            // 验证码绘制起始位置 X
            if (Request["PosX"] != null)
            {
                try
                {
                    posX = Int32.Parse(Request["PosX"]);
                }
                catch (Exception Ex)
                {
                    throw Ex;
                }
            }

            // 验证码绘制起始位置 Y
            if (Request["PosY"] != null)
            {
                try
                {
                    posY = Int32.Parse(Request["PosY"]);
                }
                catch (Exception Ex)
                {
                    throw Ex;
                }
            }
            #endregion

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;
        }
    }