using System;
using System.Data;
using System.Configuration;
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.IO;
using System.Drawing;
/// <summary>
/// MakingValidataCode 的摘要说明
/// </summary>
public class MakingValidataCode
{
public MakingValidataCode(){}
#region 验证码长度(默认4个验证码的长度)
int length = 4;
/// <summary>
/// 验证码长度(默认4个验证码的长度)
/// </summary>
public int Length
{
get{ return length; }
set{ length = value; }
}
#endregion
#region 验证码字体大小(默认12像素)
int fontSize = 12;
/// <summary>
/// 验证码字体大小(默认12像素)
/// </summary>
public int FontSize
{
get{ return fontSize; }
set{ fontSize = value; }
}
#endregion
#region 边框补(默认2像素)
int padding = 2;
/// <summary>
/// 边框补(默认2像素)
/// </summary>
public int Padding
{
get{ return padding; }
set{ padding = value; }
}
#endregion
#region 是否输出燥点(图像局部的颗粒感,粗糙感)(默认不输出)
bool chaos = false;
/// <summary>
/// 是否输出燥点(图像局部的颗粒感,粗糙感)(默认不输出)
/// </summary>
public bool Chaos
{
get{ return chaos; }
set{ chaos = value; }
}
#endregion
#region 输出燥点的颜色(默认灰色)
Color chaosColor = Color.LightGray;
/// <summary>
/// 输出燥点的颜色(默认灰色)
/// </summary>
public Color ChaosColor
{
get{ return chaosColor; }
set{ chaosColor = value; }
}
#endregion
#region 自定义背景色(默认白色)
Color backgroundColor = Color.White;
/// <summary>
/// 自定义背景色(默认白色)
/// </summary>
public Color BackgroundColor
{
get{ return backgroundColor; }
set{ backgroundColor = value; }
}
#endregion
#region 自定义随机颜色数组
Color[] colors = {Color.Black,Color.Red,Color.DarkBlue,Color.Green,Color.Orange,Color.Brown,Color.DarkCyan,Color.Purple};
/// <summary>
/// 自定义随机颜色数组
/// </summary>
public Color[] Colors
{
get{ return colors; }
set{ colors = value; }
}
#endregion
#region 自定义字体数组
string[] fonts = {"Arial", "Georgia"};
/// <summary>
/// 自定义字体数组
/// </summary>
public string[] Fonts
{
get{ return fonts; }
set{ fonts = value; }
}
#endregion
#region 自定义随机码字符串序列(使用逗号分隔)
string codeSerial = "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,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";
/// <summary>
/// 自定义随机码字符串序列(使用逗号分隔)
/// </summary>
public string CodeSerial
{
get{ return codeSerial; }
set{ codeSerial = value; }
}
#endregion
#region 生成校验码图片
/**//// <summary>
/// 生成校验码图片
/// </summary>
/// <param name="code">已经生成的随机码</param>
/// <returns>位图</returns>
public Bitmap CreateImageCode(string code)
{
int fSize = FontSize;
int fWidth = fSize + Padding;
int imageWidth = (int)(code.Length * fWidth) + 4 + Padding * 2;
int imageHeight = fSize *2 + Padding;
System.Drawing.Bitmap image = new System.Drawing.Bitmap(imageWidth, imageHeight);
Graphics g = Graphics.FromImage(image);
g.Clear(BackgroundColor);
Random rand = new Random();
//给背景添加随机生成的燥点
if(this.Chaos)
{
Pen pen = new Pen(ChaosColor, 0);
int c = Length * 10;
for(int i=0;i<c;i++)
{
int x = rand.Next(image.Width);
int y = rand.Next(image.Height);
g.DrawRectangle(pen, x, y, 1, 1);
}
}
int left = 0 , top = 0, top1 = 1, top2 = 1;
int n1 = (imageHeight - FontSize - Padding * 2);
int n2 = n1/4;
top1 = n2;
top2 = n2 *2;
Font f;
Brush b;
int cindex, findex;
//随机字体和颜色的验证码字符
for(int i=0; i<code.Length; i++)
{
cindex = rand.Next(Colors.Length - 1);
findex = rand.Next(Fonts.Length - 1);
f = new System.Drawing.Font(Fonts[findex], fSize, System.Drawing.FontStyle.Bold);
b = new System.Drawing.SolidBrush(Colors[cindex]);
if( i%2 == 1 )
{
top = top2;
}
else
{
top = top1;
}
left = i * fWidth;
g.DrawString(code.Substring(i,1), f, b, left, top);
}
//画一个边框
g.DrawRectangle(new Pen(Color.Black,0), 0, 0, image.Width-1, image.Height-1);
g.Dispose();
return image;
}
#endregion
#region 将创建好的图片输出到页面
/**//// <summary>
/// 将创建好的图片输出到页面
/// </summary>
/// <param name="code">已经生成的随机码</param>
/// <param name="context">Web上下文</param>
public void CreateImageOnPage(string code, HttpContext context)
{
System.IO.MemoryStream ms = new System.IO.MemoryStream();
Bitmap image = this.CreateImageCode(code);
image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
context.Response.ClearContent();
context.Response.ContentType = "image/Jpeg";
context.Response.BinaryWrite(ms.GetBuffer());
ms.Close();
ms = null;
image.Dispose();
image = null;
}
#endregion
#region 生成随机字符码
/**/
/// <summary>
/// 生成随机字符码
/// </summary>
/// <param name="codeLen">随机码长度</param>
/// <returns>产生的随机码</returns>
public string CreateVerifyCode(int codeLen)
{
if(codeLen == 0)
{
codeLen = Length;
}
string[] arr = CodeSerial.Split(',');
string code = "";
int randValue = -1;
Random rand = new Random(unchecked((int)DateTime.Now.Ticks));
for(int i=0; i<codeLen; i++)
{
randValue = rand.Next(0, arr.Length -1);
code += arr[randValue];
}
return code;
}
public string CreateVerifyCode()
{
return CreateVerifyCode(0);
}
#endregion
}
调用：
MakingValidataCode mvc = new MakingValidataCode();
string code = mvc.CreateVerifyCode();
mvc.CreateImageOnPage(code,this.Context);
新建一个页面来接这个图片，再在使用的地方一个图片.imageurl="新建的页面" session["code"]=code;判断是否相等就可以了。
