【下载文档: ASP.NET实例教程：ASP.NET无刷新验证码的开发(完整代码).txt 】
ASP.NET中的无刷新验证码的开发(完整代码)
复制代码 代码如下: <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Login.aspx.cs" Inherits="Login" %>
无标题页 using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; public partial class Login : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { if (!Page.IsPostBack) { Image1.ImageUrl = "VerifyCode.aspx"; } } protected void btnSubmit_Click(object sender, EventArgs e) { if (Session["ValidateCode"] != null) { string outputValidateCode = Session["ValidateCode"] as string; string inputValidateCode = txtValidateCode.Text.Trim(); if (string.Compare(outputValidateCode, inputValidateCode, true) != 0) { //Response.Write(""); litErrorMsg.Text = "输入的验证码错误！"; } else { //Response.Write(""); 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 = "
对不起，验证码错误！"; litErrorMsg.Visible = true; return; } else { litErrorMsg.Text = "
恭喜，验证码输入正确！"; litErrorMsg.Visible = true; } } #endregion } //VerifyCode.aspx为默认生成的代码 复制代码 代码如下: 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; ///
/// 正弦曲线Wave扭曲图片 /// ///
图片路径 ///
如果扭曲则选择为True ///
波形的幅度倍数，越大扭曲的程度越高，一般为3 ///
波形的起始相位，取值区间[0-2*PI) ///
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) ///
/// 将创建好的图片输出到页面 /// 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(); } ///
///得到验证码图片的宽度 /// ///
验证码的长度 /// public static int GetImagewidth(int validateNumLength) { return (int)(13 * validateNumLength + 5); } /// ///得到验证码的高度 /// /// public static int GetImageHeight() { return 25; } #endregion }
