一个生成验证字符或数字的增强类(downmoon)(基于.net1.1)及调用示例

一个生成验证字符或数字的增强类(downmoon)(基于.net1.1)及调用示例

using System;

using System.Drawing;

using System.Drawing.Imaging;

using System.Web.UI;

using System.Drawing.Drawing2D;

using System.IO;

using System.Text;

using System.Collections.Specialized;

namespace Vegnet.Common.Framework.Util

...{

    /**//// <summary>

    /// 生成验证码的类

    ///  </summary>

    调用示例#region 调用示例

       //* *********************************************调用示例**************************************************

         * 作者 downnmoon(邀月) 2006年11月************************************************************************

        //呈现页面后台

        private void getNumbers(int len)

            ...{

                ValidateNumber.CurrentLength=len;

                ValidateNumberAndChar.CurrentNumber=ValidateNumberAndChar.CreateValidateNumber(ValidateNumberAndChar.CurrentLength);

                string number=ValidateNumberAndChar.CurrentNumber;

                ValidateNumberAndChar.CreateValidateGraphic(this,number);

                HttpCookie a = new HttpCookie("VegnetValidNumber2", number);

                Response.Cookies.Add(a);

            }

        //验证页面前台

            <asp:TextBox id="TextBox3"  runat="server"></asp:TextBox>

            <asp:Label id="Label3"  runat="server"></asp:Label>

            <asp:Button id="Button3"  runat="server"Text="验证"></asp:Button>

            <IMGsrc="DispValid.aspx">

        //验证页面后台

        private void Button3_Click(object sender, System.EventArgs e)

                HttpCookieCollection cookies = Request.Cookies;

                string tmp = cookies["VegnetValidNumber2"].Value;

                this.Label3.Text=(tmp.Trim().ToLower()==TextBox3.Text.Trim().ToLower())?"正确":"无效";

        ******************************************************************************************************/

       #endregion

    public  class ValidateNumberAndChar

    ...{

        public ValidateNumberAndChar()

        ...{

        }

        /**//// <summary>

        /// 验证码的最大长度

        /// </summary>

        public static  int MaxLength

            get...{return 10;}

        /// 验证码的最小长度

        public static int MinLength

            get...{return 1;}

        /// 验证码的前缀

        public static string BaseString

            get

                return "VegnetValidNumber";

        /// 当前字符串长度，主要是为了更换图片时用

        private static int _currentLength=5;

        public static int CurrentLength

                return _currentLength;

            set

                _currentLength=value;

        /// 当前字符串，主要是为了更换图片时用

        private static string _currentNumber="";

        public static string CurrentNumber

                if(_currentNumber!="")

                ...{

                    return     _currentNumber;

                }

                else

                    return CreateValidateNumber(CurrentLength);

                _currentNumber=value;

        /// 合法字符列表

        private static  string strLetters 

                return "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";

        /// 生成验证码

        /// <param name="length">指定验证码的长度</param>

        /// <returns></returns>

        public static string CreateValidateNumber(int length)

            int[] randMembers=new int[length];

            int[] validateNums=new int[length];

            string validateNumberStr="";

            //生成起始序列值

            int seekSeek=unchecked((int)DateTime.Now.Ticks);

            Random seekRand=new Random(seekSeek);

            int beginSeek=(int)seekRand.Next(0,Int32.MaxValue-length*10000);

            int[] seeks=new int[length];

            for(int i=0;i<length;i++)

                beginSeek+=10000;

                seeks[i]=beginSeek;

            //生成随机数字

                Random rand=new Random(seeks[i]);

                int pownum=1*(int)Math.Pow(10,length);

                randMembers[i]=rand.Next(pownum,Int32.MaxValue);

            //抽取随机数字

                string numStr=randMembers[i].ToString();

                int numLength=numStr.Length;

                Random rand=new Random();

                int numPosition=rand.Next(0,numLength-1);

                validateNums[i]=Int32.Parse(numStr.Substring(numPosition,1));

            //生成验证码

                validateNumberStr+=validateNums[i].ToString();

            return validateNumberStr;

        /// 生成验证码（依据合法字符列表随机生成)

        /// <param name="length"></param>

        public static string CreateValidateChar(int length)

            StringBuilder s = new StringBuilder();

            //将随机生成的字符串绘制到图片上

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

                Random r=new Random(seeks[i]);

                s.Append(strLetters.Substring(r.Next(0, strLetters.Length - 1), 1));

            return s.ToString();

        /// 创建验证码的图片

        /// <param name="containsPage">要输出到的page对象</param>

        /// <param name="validateNum">验证码</param>

        public  static void CreateValidateGraphic(Page containsPage,string validateNum)

            Bitmap image=new Bitmap((int)Math.Ceiling(validateNum.Length*15),25);

            Graphics g=Graphics.FromImage(image);

            try

                //生成随机生成器

                Random random=new Random();

                //清空图片背景色

                g.Clear(Color.White);

                //画图片的干扰线

                for(int i=0;i<25;i++)

                    int x1=random.Next(image.Width);

                    int x2=random.Next(image.Width);

                    int y1=random.Next(image.Height);

                    int y2=random.Next(image.Height);

                    g.DrawLine(new Pen(Color.GhostWhite),x1,y1,x2,y2);

                Font font=new Font("Arial",16,(FontStyle.Bold|FontStyle.Italic));

                LinearGradientBrush brush=new LinearGradientBrush(new Rectangle(0,0,image.Width,image.Height),

                    Color.Blue,Color.DarkRed,1.2f,true);

                g.DrawString(validateNum,font,brush,3,2);

                //画图片的前景干扰点

                for(int i=0;i<100;i++)

                    int x=random.Next(image.Width);

                    int y=random.Next(image.Height);

                    image.SetPixel(x,y,Color.FromArgb(random.Next()));

                //画图片的边框线

                g.DrawRectangle(new Pen(Color.Silver),0,0,image.Width-1,image.Height-1);

                //保存图片数据

                MemoryStream stream=new MemoryStream();

                image.Save(stream,ImageFormat.Jpeg);

                //输出图片

                containsPage.Response.Clear();

                containsPage.Response.ContentType="image/jpeg";

                containsPage.Response.BinaryWrite(stream.ToArray());

            finally

                g.Dispose();

                image.Dispose();

        /// 得到验证码图片的长度

        /// <param name="validateNumLength">验证码的长度</param>

        public static int GetImageWidth(int validateNumLength)

            return (int)(validateNumLength*15);

        /// 得到验证码的高度

        public static double GetImageHeight()

            return 25;

        生成不重复的字条串#region 生成不重复的字条串

        private  string RandomKey(int b,int e)

            return DateTime.Now.ToString("yyyyMMdd-HHmmss-fff-")+this.getRandomID(b,e); 

        private int getRandomID(int minValue,int maxValue)

            Random ri=new Random(unchecked((int)DateTime.Now.Ticks));

            int k=ri.Next(minValue,maxValue);

            return k;

        private  string GuidString

                return Guid.NewGuid().ToString();

        #endregion

    }

 ​