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;}


}




/**//// <summary>


/// 验证码的最小长度


/// </summary>


public static int MinLength




...{




get...{return 1;}


}




/**//// <summary>


/// 验证码的前缀


/// </summary>


public static string BaseString




...{


get




...{


return "VegnetValidNumber";


}


}




/**//// <summary>


/// 当前字符串长度，主要是为了更换图片时用


/// </summary>


private static int _currentLength=5;


public static int CurrentLength




...{


get




...{


return _currentLength;


}


set




...{


_currentLength=value;


}


}




/**//// <summary>


/// 当前字符串，主要是为了更换图片时用


/// </summary>


private static string _currentNumber="";


public static string CurrentNumber




...{


get




...{


if(_currentNumber!="")




...{


return _currentNumber;


}


else




...{


return CreateValidateNumber(CurrentLength);


}


}


set




...{


_currentNumber=value;


}


}




/**//// <summary>


/// 合法字符列表


/// </summary>


private static string strLetters




...{


get




...{


return "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";


}


}







/**//// <summary>


/// 生成验证码


/// </summary>


/// <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


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




...{


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


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




...{


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


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




...{


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


}


return validateNumberStr;


}







/**//// <summary>


/// 生成验证码（依据合法字符列表随机生成)


/// </summary>


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


/// <returns></returns>


public static string CreateValidateChar(int length)




...{





StringBuilder s = new StringBuilder();


//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;


}


//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();


}






/**//// <summary>


/// 创建验证码的图片


/// </summary>


/// <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();


}


}




/**//// <summary>


/// 得到验证码图片的长度


/// </summary>


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


/// <returns></returns>


public static int GetImageWidth(int validateNumLength)




...{


return (int)(validateNumLength*15);


}




/**//// <summary>


/// 得到验证码的高度


/// </summary>


/// <returns></returns>


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




...{


get




...{


return Guid.NewGuid().ToString();


}


}




#endregion


}


}