验证码

转自:http://www.cnblogs.com/hlxs/archive/2011/05/06/2087977.html

using System;using System.Drawing;namespace SecurityCode{   public class DrawMethod    {            /// <summary>       /// 画图       /// </summary>       /// <param name="content"></param>       /// <param name="size"></param>       /// <param name="fileName"></param>       public void Draw(string content,Size size,string fileName)       {           Image image = new Bitmap(size.Width,size.Height);           Graphics g = Graphics.FromImage(image);           DrawBorder(g,image.Size);           DrawContent(g,content,image.Size,(int)FontSet.Font.Size);           DrawRandom(g, image.Size);           image.Save(@"D:\\" + fileName);       }       /// <summary>       /// 画边框       /// </summary>       /// <param name="g"></param>       /// <param name="size"></param>       private void DrawBorder(Graphics g, Size size)       {           Pen pen = new Pen(SolidBrushSet.SolidBrush);           Rectangle rect=new Rectangle(1,1,size.Width-4,size.Height-4);           g.DrawRectangle(pen,rect);       }       //画字符串       private void DrawContent(Graphics g, string content,Size size,int fontHeight)        {           Point point = new Point();           int i = 0;           point.Y = (size.Height - fontHeight) / 2;           int distance = size.Width / (content.Length+1);           foreach (char c in content)           {               point.X = i * distance + distance/2;               g.DrawString(c.ToString(), FontSet.Font, SolidBrushSet.SolidBrush, point);               i++;           }       }       /// <summary>       /// 画干扰       /// </summary>       /// <param name="g"></param>       /// <param name="size"></param>       private void DrawRandom(Graphics g, Size size)       {           Pen pen = new Pen(SolidBrushSet.SolidBrush);           Random rand = new Random();           for (int i = 0; i < 3; i++)           {               g.DrawLine(pen, rand.Next(size.Width), rand.Next(size.Width), rand.Next(size.Height), rand.Next(size.Height));           }           for (int i = 0; i < 10; i++)           {               Rectangle rect = new Rectangle(rand.Next(2, size.Width - 2), rand.Next(2, size.Height - 2), 1, 1);               g.DrawRectangle(pen, rect);           }       }            }}using System;namespace SecurityCode{    /// <summary>    /// 自动生成字符串    /// </summary>   public class CreateContent    {      private string so = "1234567890abcdefghijklmnopqrstuvwxyzQWERTYUIOPASDFGHJKLZXCVBNM";       /// <summary>       /// 生成内容       /// </summary>       /// <returns></returns>      public string GetContent()      {          Random rand = new Random();          string str = null;          for (int i = 0; i < 6; i++)          {              str += so.Substring(rand.Next(62), 1);          }          return str;      }    }}using System;using System.Drawing;namespace SecurityCode{    /// <summary>    /// 字体设置    /// </summary>    public class FontSet    {        public static Font Font        {            get            {                FontFamily fFamily = GetFontFamily();                FontStyle fStyle = GetFontStyle();                int emSize = GetFontSize();                return new Font(fFamily, emSize, fStyle);            }        }        private FontSet() { }        /// <summary>        /// 设置字体        /// </summary>        private static FontFamily GetFontFamily()        {            Random rand = new Random();            return FontFamily.Families[rand.Next(FontFamily.Families.Length)];        }        /// <summary>        /// 设置字体样式        /// </summary>        private static FontStyle GetFontStyle()        {            Random rand = new Random();            int index = rand.Next(1, 4);            index = 1 << index;            return (FontStyle)index;        }        /// <summary>        /// 设置字体大小        /// </summary>        public static int GetFontSize()        {            Random rand = new Random();            return rand.Next(12, 14);        }    }}using System;using System.Drawing;namespace SecurityCode{    /// <summary>    /// 画笔设置    /// </summary>   public class SolidBrushSet    {       /// <summary>       /// 画笔       /// </summary>       public static SolidBrush SolidBrush       {           get {               Color color= GetColor();               return new SolidBrush(color);           }       }       private SolidBrushSet(){}       /// <summary>       /// 随机生成画笔颜色       /// </summary>       /// <returns></returns>       public static Color GetColor()       {           Random rand = new Random();           int r = rand.Next(0,255);           int g = rand.Next(0, 255);           int b = rand.Next(0, 255);           return Color.FromArgb(r,g,b);       }    }}   private void Test()        {            DrawMethod drawMethod = new DrawMethod();            CreateContent createCont = new CreateContent();            for (int i = 0; i < 10; i++)            {                string content = createCont.GetContent();                Size size = new Size(100, 40);                drawMethod.Draw(content, size, i.ToString() + ".jpg");            }        }