C# 验证码

Random2Verify类 , 随机产生纯数字/纯字母/数字加字母2中方式的验证码.

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Drawing;namespace Image2VerifyLib.com{    /// 
    /// 随机生成验证码数据    /// 
    internal sealed class Random2Verify    {        #region 生成随机数字        /// 
        /// 生成随机数字        /// 
        /// 生成长度        public static string Number(int Length)        {            return Number(Length, false);        }        /// 
        /// 生成随机数字        /// 
        /// 生成长度        /// 是否要在生成前将当前线程阻止以避免重复        public static string Number(int Length, bool Sleep)        {            if (Sleep) System.Threading.Thread.Sleep(3);            string result = "";            System.Random random = new Random();            for (int i = 0; i < Length; i++)            {                result += random.Next(10).ToString();            }            return result;        }        #endregion        #region 生成随机字母与数字        /// 
        /// 生成随机字母与数字        /// 
        /// 生成长度        public static string Str(int Length)        {            return Str(Length, false);        }        /// 
        /// 生成随机字母与数字        /// 
        /// 生成长度        /// 是否要在生成前将当前线程阻止以避免重复        public static string Str(int Length, bool Sleep)        {            if (Sleep) System.Threading.Thread.Sleep(3);            char[] Pattern = new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z' };            string result = "";            int n = Pattern.Length;            System.Random random = new Random(~unchecked((int)DateTime.Now.Ticks));            for (int i = 0; i < Length; i++)            {                int rnd = random.Next(0, n);                result += Pattern[rnd];            }            return result;        }        #endregion        #region 生成随机纯字母随机数        /// 
        /// 生成随机纯字母随机数        /// 
        /// 生成长度        public static string Str_char(int Length)        {            return Str_char(Length, false);        }        /// 
        /// 生成随机纯字母随机数        /// 
        /// 生成长度        /// 是否要在生成前将当前线程阻止以避免重复        public static string Str_char(int Length, bool Sleep)        {            if (Sleep) System.Threading.Thread.Sleep(3);            char[] Pattern = new char[] { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z' };            string result = "";            int n = Pattern.Length;            System.Random random = new Random(~unchecked((int)DateTime.Now.Ticks));            for (int i = 0; i < Length; i++)            {                int rnd = random.Next(0, n);                result += Pattern[rnd];            }            return result;        }        #endregion    }}

核心类Image2VerifyTool:

using System;using System.Security.Cryptography;using System.Drawing;using Image2VerifyLib.com;using System.ComponentModel;using System.Drawing.Drawing2D;namespace Image2VerifyLib{    /// 
    /// 验证码生成器    /// 
    public sealed class Image2VerifyTool    {        #region 私有字段        private string text = String.Empty;        private Bitmap p_w_picpath = null;        private readonly int letterCount = 4;   //验证码位数        private readonly int letterWidth = 16;  //单个字体的宽度范围        private readonly int letterHeight = 20; //单个字体的高度范围        private static byte[] randb = new byte[4];        private static RNGCryptoServiceProvider rand = new RNGCryptoServiceProvider();        private readonly Color background_color = Color.White;//背景颜色        private Font[] fonts =             {               new Font(new FontFamily("Times New Roman"),10 +Next(4,8),System.Drawing.FontStyle.Italic|System.Drawing.FontStyle.Bold),               new Font(new FontFamily("Georgia"), 10 + Next(4,8),System.Drawing.FontStyle.Italic|System.Drawing.FontStyle.Bold),               new Font(new FontFamily("Arial"), 10 + Next(4,8),System.Drawing.FontStyle.Italic|System.Drawing.FontStyle.Bold),               new Font(new FontFamily("Comic Sans MS"), 10 + Next(4,8),System.Drawing.FontStyle.Italic|System.Drawing.FontStyle.Bold),               new Font(new FontFamily("Microsoft YaHei"), 10 + Next(4,8),System.Drawing.FontStyle.Italic|System.Drawing.FontStyle.Bold),               new Font(new FontFamily("Verdana"), 10 + Next(4,8),System.Drawing.FontStyle.Italic|System.Drawing.FontStyle.Bold),               new Font(new FontFamily("Tahoma"), 10 + Next(4,8),System.Drawing.FontStyle.Italic|System.Drawing.FontStyle.Bold)            };        #endregion        #region 公有属性        /// 
        /// 验证码        /// 
        public string Text        {            get { return this.text; }        }        /// 
        /// 验证码位数        /// 
        public int LetterCount        {            get { return this.letterCount; }        }        #endregion        #region 构造函数        /// 
        ///         /// 
        /// 验证码背景色        /// 验证码位数        /// 单个字体的宽度范围        /// 单个字体的高度范围        public Image2VerifyTool(Color background_color, int letterCount = 4, int letterWidth = 16, int letterHeight = 20)        {            this.background_color = background_color;            this.letterCount = letterCount;            this.letterWidth = letterWidth;            this.letterHeight = letterHeight;        }        #endregion        #region 生成验证码        /// 
        /// 生成图片验证码        /// 
        /// 验证码类型        ///         public Bitmap CreateVerify(Type2Verfy type)        {            switch (type)            {                 case Type2Verfy.Number:                    this.text = Random2Verify.Number(this.letterCount);                    break;                case Type2Verfy.Letter:                    this.text = Random2Verify.Str_char(this.letterCount);                    break;                case Type2Verfy.Number_Letter:                    this.text = Random2Verify.Str(this.letterCount);                    break;                default:                    this.text = Random2Verify.Str(this.letterCount);                    break;            }            this.CreateImage();            return this.p_w_picpath;        }        #endregion        #region 私有方法        /// 
        /// 获得下一个随机数        /// 
        /// 最大值        private static int Next(int max)        {            rand.GetBytes(randb);            int value = BitConverter.ToInt32(randb, 0);            value = value % (max + 1);            if (value < 0) value = -value;            return value;        }        /// 
        /// 获得下一个随机数        /// 
        /// 最小值        /// 最大值        private static int Next(int min, int max)        {            int value = Next(max - min) + min;            return value;        }        #endregion        #region 公共方法        /// 
        /// 绘制验证码        /// 
        private void CreateImage()        {            int int_ImageWidth = this.text.Length * letterWidth;            Bitmap p_w_picpath = new Bitmap(int_ImageWidth, letterHeight);            Graphics g = Graphics.FromImage(p_w_picpath);            g.Clear(this.background_color);            int i = 0;            for (i = 0; i < 3; i++)            {                int x1 = Next(p_w_picpath.Width);                int x2 = Next(p_w_picpath.Width);                int y1 = Next(p_w_picpath.Height);                int y2 = Next(p_w_picpath.Height);                g.DrawLine(new Pen(GetRandomColor(false), this.Pen_Random_Width), x1, y1, x2, y2);            }            int _x = -12, _y = 0;            for (int int_index = 0; int_index < this.text.Length; int_index++)            {                _x += Next(14, 18);                _y = Next(-1, 0);                string str_char = this.text.Substring(int_index, 1);                str_char = Next(1) == 1 ? str_char.ToLower() : str_char.ToUpper();                Brush newBrush = new LinearGradientBrush(new Rectangle(_x, _y, p_w_picpath.Width, p_w_picpath.Height), GetRandomColor(true), GetRandomColor(true),1.2f,true);                Point thePos = new Point(_x, _y);                g.DrawString(str_char, fonts[Next(fonts.Length - 1)] , newBrush, thePos);            }            //噪点            for (i = 0; i < 15; i++)            {                int x1 = Next(p_w_picpath.Width - 1);                int y1 = Next(p_w_picpath.Height - 1);                Pen p = new Pen(GetRandomColor(false), Next(1, 2));                g.DrawRectangle(p, x1, y1, 1, 1);            }            p_w_picpath = TwistImage(p_w_picpath, true, Next(1, 3), Next(4, 5));            //g.DrawRectangle(new Pen(this.background_color, 1), 0, 0, int_ImageWidth - 1, (letterHeight - 1));            this.p_w_picpath = p_w_picpath;        }        /// 
        /// 字体随机颜色        /// 
        private Color GetRandomColor( Boolean is_code = true )        {            Random RandomNum_First = new Random(Guid.NewGuid().GetHashCode());            Random RandomNum_Sencond = new Random(Guid.NewGuid().GetHashCode());            int int_Red = RandomNum_First.Next(180);            int int_Green = RandomNum_Sencond.Next(180);            int int_Blue = (int_Red + int_Green > 300) ? 0 : 400 - int_Red - int_Green;            int_Blue = (int_Blue > 255) ? 255 : int_Blue;            if (is_code)                return Color.FromArgb(255, int_Red, int_Green, int_Blue);            else            {                //Random rand = new Random(Guid.NewGuid().GetHashCode());                return Color.FromArgb( Next(120,200) , int_Red, int_Green, int_Blue);            }        }        /// 
        /// pen的随机宽度        /// 
        private int Pen_Random_Width        {             get            {                //Random rand = new Random(Guid.NewGuid().GetHashCode());                return Next(1, 3);            }        }                /// 
        /// 正弦曲线Wave扭曲图片        /// 
        /// 图片路径        /// 如果扭曲则选择为True        /// 波形的幅度倍数，越大扭曲的程度越高,一般为3        /// 波形的起始相位,取值区间[0-2*PI)        private Bitmap TwistImage(Bitmap srcBmp, bool bXDir, double dMultValue, double dPhase)        {            double PI = Math.PI*2.0;            Bitmap destBmp = new Bitmap(srcBmp.Width, srcBmp.Height);            Graphics graph = Graphics.FromImage(destBmp);            graph.FillRectangle(new SolidBrush(Color.White), 0, 0, destBmp.Width, destBmp.Height);            graph.Dispose();            double dBaseAxisLen = bXDir ? (double)destBmp.Height : (double)destBmp.Width;            for (int i = 0; i < destBmp.Width; i++)            {                for (int j = 0; j < destBmp.Height; j++)                {                    double dx = 0;                    dx = bXDir ? (PI * (double)j) / dBaseAxisLen : (PI * (double)i) / dBaseAxisLen;                    dx += dPhase;                    double dy = Math.Sin(dx);                    int nOldX = 0, nOldY = 0;                    nOldX = bXDir ? i + (int)(dy * dMultValue) : i;                    nOldY = bXDir ? j : j + (int)(dy * dMultValue);                    Color color = srcBmp.GetPixel(i, j);                    if (nOldX >= 0 && nOldX < destBmp.Width                     && nOldY >= 0 && nOldY < destBmp.Height)                    {                        destBmp.SetPixel(nOldX, nOldY, color);                    }                }            }            srcBmp.Dispose();            return destBmp;        }        #endregion    }    /// 
    /// 验证码类型的枚举    /// 
    public enum Type2Verfy : uint    {        [Description("纯数字")]        Number = 0,        [Description("纯字母")]        Letter = 1,        [Description("数字加字母")]        Number_Letter = 2    }}

测试(winform)

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using Image2VerifyLib;namespace Image2VerifyTest{    public partial class Form1 : Form    {        private Image2VerifyTool img2Verify = null;        private string verify2code = string.Empty;        public Form1()        {            InitializeComponent();            img2Verify = new Image2VerifyTool(Color.Violet,5,20,25);            verify2code = this.create_img2verify();        }        private string create_img2verify()        {            Bitmap p_w_picpath = img2Verify.CreateVerify(Type2Verfy.Number_Letter);//创建数字字母混合型验证码            this.pictureBox1.Image = p_w_picpath;            return img2Verify.Text.ToLower();        }        private void button1_Click(object sender, EventArgs e)        {            string inter_str = this.textBox1.Text.Trim().ToLower();            if (inter_str.Length == 0)            {                MessageBox.Show("请先填写验证码");            }            else            {                if (inter_str.Length != img2Verify.LetterCount || inter_str != verify2code)                {                    MessageBox.Show("验证码错误");                    verify2code = this.create_img2verify();                }                else                {                    MessageBox.Show("恭喜,通过验证");                }            }        }        private void button2_Click(object sender, EventArgs e)        {            verify2code = this.create_img2verify();        }    }}

new Image2VerifyTool(Color.Violet,5,20,25);构造函数参数解释

第一个 : 验证码背景色

第二个 : 产生几位的验证码(本次5位)

第三个 : 每一位验证码的宽度

第四个 : 每一位验证码的高度

其中 : Bitmap p_w_picpath = Image2VerifyTool.CreateVerify(Type2Verfy.Number_Letter);//创建数字字母混合型验证码得到一个字母与数字混合型的图片

验证码的获取 : Image2VerifyTool.Text

验证码类型参见:

    /// 
    /// 验证码类型的枚举    /// 
    public enum Type2Verfy : uint    {        [Description("纯数字")]        Number = 0,        [Description("纯字母")]        Letter = 1,        [Description("数字加字母")]        Number_Letter = 2    }

结果: