验证码

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UI Web Linq Security

using System;
using System.Linq;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Collections.Generic;
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.Imaging;
using System.Drawing.Drawing2D;
using System.Drawing;

namespace InfoSecurity.Web
{
    public partial class CAPTCHA : System.Web.UI.Page
    {

        // 验证码长度
        private int codeLen = 4;
        // 图片清晰度
        private int fineness = 100;
        // 图片宽度
        private int imgWidth = 80;
        // 图片高度
        private int imgHeight = 24;
        // 字体家族名称
        private string fontFamily = "Arial Black";
        // 字体大小
        private int fontSize = 13;
        // 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;

        protected void Page_Load(object sender, EventArgs e)
        {
            #region 读取 Request 传递参数
            if (Request["rdn"]== null) {
                codeLen = 0;
            }
            //InitBrushList();
            // 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);
            // 获取绘制器对象
            Graphics g = Graphics.FromImage(bitmap);
            try
            {
                // 绘制验证码图像
                Drawcode(g, bitmap, code);
                // 保存验证码图像，等待输出
                bitmap.Save(Response.OutputStream, ImageFormat.Gif);
            }
            finally
            {
                g.Dispose();
                bitmap.Dispose();
            }

        }

        //------------------------------------------------------------
        // 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;
        }

        //------------------------------------------------------------
        // 绘制验证码图片
        //------------------------------------------------------------
        private void Drawcode(Graphics g,Bitmap bitmap, string code)
        {

            // 设置绘制字体
            Font font = new Font(fontFamily, fontSize, GetFontStyle());
            Random r = new Random();
            g.Clear(Color.White);
            // 畫圖片的背景噪音線
            for (int i = 0; i < 25; i++)
            {
                int x1 = r.Next(imgWidth);
                int x2 = r.Next(imgWidth);
                int y1 = r.Next(imgHeight);
                int y2 = r.Next(imgHeight);

                g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
            }
            // 绘制验证码图像
            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, imgWidth, imgHeight), Color.Blue, Color.DarkRed, 1.2f, true);
            g.DrawString(code, font, brush, posX, posY);
            //g.DrawString(code, font, Brushes.Black, posX, posY);
            //畫圖片的前景噪音點
            for (int i = 0; i < 100; i++)
            {
                int x = r.Next(imgWidth);
                int y = r.Next(imgHeight);

                bitmap.SetPixel(x, y, Color.FromArgb(r.Next()));
            }
            //画图片的边框线
            g.DrawRectangle(new Pen(Color.Silver), 0, 0, imgWidth - 1, imgHeight - 1);
        }
        private int GetRandomint(int min, int max)
        {
            Random random = new Random();
            return (random.Next(min, max));
        }

        //------------------------------------------------------------
        // 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;
        }

    }
}

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