无刷新验证码代码,Asp.Net代码库,德仔网

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【Asp.Net】无刷新验证码
作者:Dezai.CN / 发布于2013/3/1/ 645

	if (Session["ValidateCode"] != null)
	 {
	 string outputValidateCode = Session["ValidateCode"] as string;
	 string inputValidateCode = txtValidateCode.Text.Trim();
	 if (string.Compare(outputValidateCode, inputValidateCode, true) != 0)
	 {
	 //Response.Write("<script>javascript:alert('输入的验证码错误！');</script>");
	 litErrorMsg.Text = "输入的验证码错误！";
	 }
	 else
	 {
	 //Response.Write("<script>javascript:alert('输入的验证码正确！');</script>");
	 litErrorMsg.Text = "输入的验证码正确！";
	 }
	 }
	 }

	 #region 调用下面的方法实现客户端保存Cookie验证模式

	 private void ValidateMethod()
	 {
	 if (Request.Cookies["CheckCode"] == null)
	 {
	 litErrorMsg.Text = "您的浏览器设置已被禁用 Cookies，您必须设置浏览器允许使用 Cookies 选项后才能使用本系统。";
	 litErrorMsg.Visible = true;
	 return;
	 }

	 if (String.Compare(Request.Cookies["CheckCode"].Value, TextBox1.Text.ToString().Trim(), true) != 0)
	 {
	 litErrorMsg.Text = "<font color=red>对不起，验证码错误！</font>";
	 litErrorMsg.Visible = true;
	 return;
	 }
	 else
	 {
	 litErrorMsg.Text = "<font color=green>恭喜，验证码输入正确！</font>";
	 litErrorMsg.Visible = true;
	 }
	 }

	 #endregion
	}

	//VerifyCode.aspx为默认生成的代码

	using System;
	using System.Data;
	using System.Configuration;
	using System.Collections;
	using System.Web;
	using System.Web.Security;
	using System.Web.UI;
	using System.Web.UI.WebControls.WebParts;
	using System.Web.UI.HtmlControls;
	using System.Drawing;
	using System.Drawing.Imaging;
	using System.Drawing.Drawing2D;
	using System.IO;
	public partial class VerifyCode : System.Web.UI.Page
	{
	 protected void Page_Load(object sender, EventArgs e)
	 {
	 //GenerateValidateCode();
	 GenerateVerifyImage(4);//GenerateVerifyImage(int length)
	 }

	 #region 【无刷新仿google波形扭曲彩色】验证码样式0___GenerateValidateCode()

	 private void GenerateValidateCode()
	 {
	 this.Length = this.length;
	 this.FontSize = this.fontSize;
	 this.Chaos = this.chaos;
	 this.BackgroundColor = this.backgroundColor;
	 this.ChaosColor = this.chaosColor;
	 this.CodeSerial = this.codeSerial;
	 this.Colors = this.colors;
	 this.Fonts = this.fonts;
	 this.Padding = this.padding;
	 string VNum = this.CreateVerifyCode(); //取随机码
	 Session["ValidateCode"] = VNum.ToUpper();//取得验证码，以便后来验证
	 this.CreateImageOnPage(VNum, this.Context); // 输出图片

	 //Cookie验证模式， 使用Cookies取验证码的值
	 //Response.Cookies.Add(new HttpCookie("CheckCode", code.ToUpper()));
	 }

	 #endregion

	 #region 验证码长度(默认4个验证码的长度)
	 int length = 4;
	 public int 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 = 22;
	 public int FontSize
	 {
	 get { return fontSize; }
	 set { fontSize = value; }
	 }
	 #endregion

	 #region 边框补(默认1像素)
	 int padding = 2;
	 public int Padding
	 {
	 get { return padding; }
	 set { padding = value; }
	 }
	 #endregion

	 #region 是否输出燥点(默认不输出)
	 bool chaos = true;
	 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;
	 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;
	 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 };
	 public Color[] Colors
	 {
	 get { return colors; }
	 set { colors = value; }
	 }
	 #endregion

	 #region 自定义字体数组
	 string[] fonts = { "Arial", "Georgia" };
	 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";
	 public string CodeSerial
	 {
	 get { return codeSerial; }
	 set { codeSerial = value; }
	 }
	 #endregion

	 #region 产生波形滤镜效果
	 private const double PI = 3.1415926535897932384626433832795;
	 private const double PI2 = 6.283185307179586476925286766559;
	 /// <summary>
	 /// 正弦曲线Wave扭曲图片
	 /// </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 Bitmap TwistImage(Bitmap srcBmp, bool bXDir, double dMultValue, double dPhase)
	 {
	 Bitmap destBmp = new Bitmap(srcBmp.Width, srcBmp.Height);

	 // 将位图背景填充为白色
	 System.Drawing.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 ? (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
	 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 边框颜色为Color.Gainsboro
	 g.DrawRectangle(new Pen(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, 4, 4);

	 return image;
	 }
	 #endregion

	 #region 将创建好的图片输出到页面
	 public void CreateImageOnPage(string code, HttpContext context)
	 {
	 Response.BufferOutput = true; //特别注意
	 Response.Cache.SetExpires(DateTime.Now.AddMilliseconds(-1));//特别注意
	 Response.Cache.SetCacheability(HttpCacheability.NoCache);//特别注意
	 Response.AppendHeader("Pragma", "No-Cache"); //特别注意

	 MemoryStream ms = new MemoryStream();
	 Bitmap image = this.CreateImageCode(code);
	 image.Save(ms, ImageFormat.Jpeg);
	 Response.ClearContent();
	 Response.ContentType = "image/JPEG";
	 Response.BinaryWrite(ms.ToArray());
	 Response.End();

	 ms.Close();
	 ms = null;
	 image.Dispose();
	 image = null;
	 }
	 #endregion

	 #region 生成随机字符码
	 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

	 #region 另一种验证码样式 GenerateVerifyImage(int length)

	 /// <summary>
	 /// 将创建好的图片输出到页面
	 /// </summary>
	 public void GenerateVerifyImage(int nLen)
	 {
	 string validateCode = "";//生成的验证码

	 int nBmpWidth = GetImagewidth(nLen);
	 int nBmpHeight = GetImageHeight();
	 System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(nBmpWidth, nBmpHeight);

	 //对图像进行弯曲
	 TwistImage(bmp, true, 12, 2);
	 // 1. 生成随机背景颜色
	 int nRed, nGreen, nBlue; // 背景的三元色
	 System.Random rd = new Random((int)System.DateTime.Now.Ticks);
	 nRed = rd.Next(255) % 128 + 128;
	 nGreen = rd.Next(255) % 128 + 128;
	 nBlue = rd.Next(255) % 128 + 128;

	 // 2. 填充位图背景
	 System.Drawing.Graphics graph = System.Drawing.Graphics.FromImage(bmp);
	 graph.FillRectangle(new SolidBrush(System.Drawing.Color.FromArgb(nRed, nGreen, nBlue))
	 , 0
	 , 0
	 , nBmpWidth
	 , nBmpHeight);
	 // 3. 绘制干扰线条，采用比背景略深一些的颜色
	 int nLines = 3;
	 System.Drawing.Pen pen = new System.Drawing.Pen(System.Drawing.Color.FromArgb(nRed - 17, nGreen - 17, nBlue - 17), 2);
	 for (int a = 0; a < nLines; a++)
	 {
	 int x1 = rd.Next() % nBmpWidth;
	 int y1 = rd.Next() % nBmpHeight;
	 int x2 = rd.Next() % nBmpWidth;
	 int y2 = rd.Next() % nBmpHeight;
	 graph.DrawLine(pen, x1, y1, x2, y2);
	 }

	 // 采用的字符集，可以随即拓展，并可以控制字符出现的几率
	 string strCode = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";

	 // 4. 循环取得字符，并绘制
	 for (int i = 0; i < nLen; i++)
	 {
	 int x = (i * 13 + rd.Next(3));
	 int y = rd.Next(4) + 1;

	 // 确定字体
	 System.Drawing.Font font = new System.Drawing.Font("Courier New",//文字字体类型
	 12 + rd.Next() % 4,//文字字体大小
	 System.Drawing.FontStyle.Bold);//文字字体样式
	 char c = strCode[rd.Next(strCode.Length)]; // 随机获取字符
	 validateCode += c.ToString();

	 // 绘制字符
	 graph.DrawString(c.ToString(),
	 font,
	 new SolidBrush(System.Drawing.Color.FromArgb(nRed - 60 + y * 3, nGreen - 60 + y * 3, nBlue - 40 + y * 3)),
	 x,
	 y);
	 }

	 Session["ValidateCode"] = validateCode;
	 //对图像进行弯曲
	 TwistImage(bmp, true, 4, 4);

	 Response.BufferOutput = true; //特别注意
	 Response.Cache.SetExpires(DateTime.Now.AddMilliseconds(-1));//特别注意
	 Response.Cache.SetCacheability(HttpCacheability.NoCache);//特别注意
	 Response.AppendHeader("Pragma", "No-Cache"); //特别注意

	 // 5. 输出字节流
	 MemoryStream bstream = new MemoryStream();
	 bmp.Save(bstream, ImageFormat.Jpeg);

	 Response.ClearContent();
	 Response.ContentType = "image/JPEG";
	 Response.BinaryWrite(bstream.ToArray());
	 Response.End();

	 bstream.Close();
	 bstream = null;
	 bmp.Dispose();
	 bmp = null;
	 graph.Dispose();
	 }

	 ///<summary>
	 ///得到验证码图片的宽度
	 ///</summary>
	 ///<paramname="validateNumLength">验证码的长度</param>
	 ///<returns></returns>
	 public static int GetImagewidth(int validateNumLength)
	 {
	 return (int)(13 * validateNumLength + 5);
	 }
	 ///<summary>
	 ///得到验证码的高度
	 ///</summary>
	 ///<returns></returns>
	 public static int GetImageHeight()
	 {
	 return 25;
	 }

	 #endregion
	}
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