收藏一个仿照google的可以扭曲的验证码

来源：互联网发布：月度总结数据ppt范文编辑：程序博客网时间：2024/05/04 20:37

一个无刷新仿google波形扭曲彩色Asp.net验证码，源代码来自51aspx。

主要有三个文件

VerifyCode.cs是生成验证码的类库文件，核心

VerifyCodes.aspx：调用上面的类库来生成验证码的页面文件

Index.aspx：前台显示验证码的页面文件

下面就是全部的代码

1.VerifyCode.cs文件

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.Drawing;

///<summary>

/// VerifyCode 的摘要说明

///</summary>

publicclassVerifyCode

{

#region验证码长度(默认6个验证码的长度)

int length = 6;

publicint Length

{

get { return length; }

set { length = value; }

}

#endregion

#region验证码字体大小(为了显示扭曲效果，默认40像素，可以自行修改)

int fontSize = 40;

publicint FontSize

{

get { return fontSize; }

set { fontSize = value; }

}

#endregion

#region边框补(默认1像素)

int padding = 2;

publicint Padding

{

get { return padding; }

set { padding = value; }

}

#endregion

#region是否输出燥点(默认不输出)

bool chaos = true;

publicbool Chaos

{

get { return chaos; }

set { chaos = value; }

}

#endregion

#region输出燥点的颜色(默认灰色)

Color chaosColor = Color.LightGray;

publicColor ChaosColor

{

get { return chaosColor; }

set { chaosColor = value; }

}

#endregion

#region自定义背景色(默认白色)

Color backgroundColor = Color.White;

publicColor 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 };

publicColor[] Colors

{

get { return colors; }

set { colors = value; }

}

#endregion

#region自定义字体数组

string[] fonts = { "Arial", "Georgia", "courier new" };

publicstring[] 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";

publicstring CodeSerial

{

get { return codeSerial; }

set { codeSerial = value; }

}

#endregion

#region产生波形滤镜效果

privateconstdouble PI = 3.1415926535897932384626433832795;

privateconstdouble PI2 = 6.283185307179586476925286766559;

///<summary>

///正弦曲线Wave扭曲图片（Edit By 51aspx.com）

///</summary>

///<param name="srcBmp">图片路径</param>

///<param name="bXDir">如果扭曲则选择为True</param>

///<param name="nMultValue">波形的幅度倍数，越大扭曲的程度越高，一般为3</param>

///<param name="dPhase">波形的起始相位，取值区间[0-2*PI)</param>

///<returns></returns>

public System.Drawing.Bitmap TwistImage(Bitmap srcBmp, bool bXDir, double dMultValue, double dPhase)

{

System.Drawing.Bitmap destBmp = newBitmap(srcBmp.Width, srcBmp.Height);

// 将位图背景填充为白色

System.Drawing.Graphics graph = System.Drawing.Graphics.FromImage(destBmp);

graph.FillRectangle(newSolidBrush(System.Drawing.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 ? (PI2 * (double)j) / dBaseAxisLen : (PI2 * (double)i) / dBaseAxisLen;

dx += dPhase;

double dy = Math.Sin(dx);

// 取得当前点的颜色

int nOldX = 0, nOldY = 0;

nOldX = bXDir ? i + (int)(dy * dMultValue) : i;

nOldY = bXDir ? j : j + (int)(dy * dMultValue);

System.Drawing.Color color = srcBmp.GetPixel(i, j);

if (nOldX >= 0 && nOldX < destBmp.Width

&& nOldY >= 0 && nOldY < destBmp.Height)

{

destBmp.SetPixel(nOldX, nOldY, color);

}

return destBmp;

}

#endregion

#region生成校验码图片

publicBitmap 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 = newRandom();

//给背景添加随机生成的燥点

if (this.Chaos)

{

Pen pen = newPen(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);

}

//画一个边框边框颜色为Color.Gainsboro

g.DrawRectangle(newPen(Color.Gainsboro, 0), 0, 0, image.Width - 1, image.Height - 1);

g.Dispose();

//产生波形（Add By 51aspx.com）

image = TwistImage(image, true, 8, 4);

return image;

}

#endregion

#region将创建好的图片输出到页面

publicvoid 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

publicstring CreateVerifyCode(int codeLen)

{

if (codeLen == 0)

{

codeLen = Length;

}

string[] arr = CodeSerial.Split(',');

string code = "";

int randValue = -1;

Random rand = newRandom(unchecked((int)DateTime.Now.Ticks));

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

{

randValue = rand.Next(0, arr.Length - 1);

code += arr[randValue];

}

return code;

}

publicstring CreateVerifyCode()

{

return CreateVerifyCode(0);

}

#endregion

}

2.VerifyCodes.aspx.cs代码（只要一个Page_Load事件其余的什么也没有了）

Page_Load事件：

VerifyCode v = newVerifyCode();

string code = v.CreateVerifyCode(4);//验证码长度

v.CreateImageOnPage(code, this.Context);

Session["ver"] = code;

3.Verify.aspx代码

<div>

<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button"/>

<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>

<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label></div>

4.Verify.aspx.cs代码：

protectedvoid Button1_Click(object sender, EventArgs e)

{

if (TextBox1.Text == Session["ver"].ToString())

{

this.Label1.Text = "OKKKKKKKKK";

}

else

{

this.Label1.Text = "Error";

}