<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Login.aspx.cs" Inherits="Login" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head id="Head1" runat="server"> <title>無標題頁</title> <script type="text/javascript"> function DoFresh() { document.getElementById("Image1").src = "VerifyCode.aspx"; } </script> </head> <body> <form id="form1" runat="server"> <div> <table> <tr> <td> 驗證碼：<asp:TextBox ID="txtValidateCode" runat="server"></asp:TextBox> </td> <td> <asp:Image ID="Image1" runat="server" /> <a href="javascript:DoFresh();">看不清?</a> </td> </tr> <tr> <td align="center" colspan="2"> <br /> <asp:Literal ID="litErrorMsg" runat="server"></asp:Literal> <asp:Button ID="btnSubmit" runat="server" Text="確定" onclick="btnSubmit_Click" /> </td> </tr> </table> </div> </form> </body> </html> 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("<script>javascript:alert('輸入的驗證碼錯誤！');</script>"); litErrorMsg.Text = "輸入的驗證碼錯誤！"; } else { //Response.Write("<script>javascript:alert('輸入的驗證碼正確！');</script>"); litErrorMsg.Text = "輸入的驗證碼正確！"; } } } #region 調用下面的方法實現用戶端儲存Cookie驗證模式 private void ValidateMethod() { if (Request.Cookies["CheckCode"] == null) { litErrorMsg.Text = "您的瀏覽器設定已被禁用 Cookies，您必須設定瀏覽器允許使用 Cookies 選項後才能使用本系統。"; litErrorMsg.Visible = true; return; } if (String.Compare(Request.Cookies["CheckCode"].Value, TextBox1.Text.ToString().Trim(), true) != 0) { litErrorMsg.Text = "<font color=red>對不起，驗證碼錯誤！</font>"; litErrorMsg.Visible = true; return; } else { litErrorMsg.Text = "<font color=green>恭喜，驗證碼輸入正確！</font>"; litErrorMsg.Visible = true; } } #endregion }
//VerifyCode.aspx為預設產生的程式碼
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 【無重新整理仿google波形扭曲彩色】驗證碼樣式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(); //取隨機碼 Session["ValidateCode"] = VNum.ToUpper();//取得驗證碼，以便後來驗證 this.CreateImageOnPage(VNum, this.Context); // 輸出圖片 //Cookie驗證模式， 使用Cookies取驗證碼的值 //Response.Cookies.Add(new HttpCookie("CheckCode", code.ToUpper())); } #endregion #region 驗證碼長度(預設4個驗證碼的長度) int length = 4; public int Length { get { return length; } set { length = value; } } #endregion #region 驗證碼字型大小(為了顯示扭曲效果，預設40像素，可以自行修改) int fontSize = 22; public int FontSize { get { return fontSize; } set { fontSize = value; } } #endregion #region 邊框補(預設1像素) int padding = 2; public int Padding { get { return padding; } set { padding = value; } } #endregion #region 是否輸出燥點(預設不輸出) bool chaos = true; public bool Chaos { get { return chaos; } set { chaos = value; } } #endregion #region 輸出燥點的顏色(預設灰色) Color chaosColor = Color.LightGray; public Color ChaosColor { get { return chaosColor; } set { chaosColor = value; } } #endregion #region 自訂背景色(預設白色) Color backgroundColor = Color.White; public Color BackgroundColor { get { return backgroundColor; } set { backgroundColor = value; } } #endregion #region 自訂隨機顏色數組 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 自訂字型數組 string[] fonts = { "Arial", "Georgia" }; public string[] Fonts { get { return fonts; } set { fonts = value; } } #endregion #region 自訂隨機碼字串序列(使用逗號分隔) 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 產生波形濾鏡效果 private const double PI = 3.1415926535897932384626433832795; private const double PI2 = 6.283185307179586476925286766559; /// <summary> /// 正弦曲線Wave扭曲圖片 /// </summary> /// <param name="srcBmp">圖片路徑</param> /// <param name="bXDir">如果扭曲則選擇為True</param> /// <param name="nMultValue">波形的幅度倍數，越大扭曲的程度越高，一般為3</param> /// <param name="dPhase">波形的起始相位，取值區間[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); // 將位元影像背景填充為白色 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); // 取得當前點的顏色 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 產生校正碼圖片 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(); //給背景添加隨機產生的燥點 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; //隨機字型和顏色的驗證碼字元 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); } //畫一個邊框 邊框顏色為Color.Gainsboro g.DrawRectangle(new Pen(Color.Gainsboro, 0), 0, 0, image.Width - 1, image.Height - 1); g.Dispose(); //產生波形（Add By 51aspx.com） image = TwistImage(image, true, 4, 4); return image; } #endregion #region 將建立好的圖片輸出到頁面 public void CreateImageOnPage(string code, HttpContext context) { Response.BufferOutput = true; //特別注意 Response.Cache.SetExpires(DateTime.Now.AddMilliseconds(-1));//特別注意 Response.Cache.SetCacheability(HttpCacheability.NoCache);//特別注意 Response.AppendHeader("Pragma", "No-Cache"); //特別注意 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 產生隨機字元碼 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 另一種驗證碼樣式 GenerateVerifyImage(int length) /// <summary> /// 將建立好的圖片輸出到頁面 /// </summary> public void GenerateVerifyImage(int nLen) { string validateCode = "";//產生的驗證碼 int nBmpWidth = GetImagewidth(nLen); int nBmpHeight = GetImageHeight(); System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(nBmpWidth, nBmpHeight); //對映像進行彎曲 TwistImage(bmp, true, 12, 2); // 1. 產生隨機背景顏色 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. 填充位元影像背景 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. 繪製幹擾線條，採用比背景略深一些的顏色 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); } // 採用的字元集，可以隨即拓展，並可以控制字元出現的幾率 string strCode = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"; // 4. 迴圈取得字元，並繪製 for (int i = 0; i < nLen; i++) { int x = (i * 13 + rd.Next(3)); int y = rd.Next(4) + 1; // 確定字型 System.Drawing.Font font = new System.Drawing.Font("Courier New",//文字字型類型 12 + rd.Next() % 4,//文字字型大小 System.Drawing.FontStyle.Bold);//文字字型樣式 char c = strCode[rd.Next(strCode.Length)]; // 隨機擷取字元 validateCode += c.ToString(); // 繪製字元 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; //對映像進行彎曲 TwistImage(bmp, true, 4, 4); Response.BufferOutput = true; //特別注意 Response.Cache.SetExpires(DateTime.Now.AddMilliseconds(-1));//特別注意 Response.Cache.SetCacheability(HttpCacheability.NoCache);//特別注意 Response.AppendHeader("Pragma", "No-Cache"); //特別注意 // 5. 輸出位元組流 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> ///得到驗證碼圖片的寬度 ///</summary> ///<paramname="validateNumLength">驗證碼的長度</param> ///<returns></returns> public static int GetImagewidth(int validateNumLength) { return (int)(13 * validateNumLength + 5); } ///<summary> ///得到驗證碼的高度 ///</summary> ///<returns></returns> public static int GetImageHeight() { return 25; } #endregion }Start building with 50+ products and up to 12 months usage for Elastic Compute Service
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