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12306奇葩驗(yàn)證碼引發(fā)思考之C#實(shí)現(xiàn)驗(yàn)證碼程序

來(lái)源：本站原創(chuàng)|時(shí)間：2020-01-10|欄目：C#教程|點(diǎn)擊： 次

近日鐵路訂票網(wǎng)“12306”又出現(xiàn)多道另類考題，竟要訂票者在8個(gè)圖案中“點(diǎn)擊圖中所有美男子”、“請(qǐng)點(diǎn)擊下圖中所有的非智能眼鏡”、“請(qǐng)點(diǎn)擊下圖中所有的博斯普魯斯海峽”，網(wǎng)友吐槽：比高考題還難，到底是什么樣子的，先跟大家分享一下幾個(gè)例子：

哈哈，是有點(diǎn)奇葩的驗(yàn)證碼，怪不得有人會(huì)說(shuō)“媽媽我已經(jīng)找不到回家”，這讓分秒必爭(zhēng)的春運(yùn)網(wǎng)上搶票者瞬間傻眼，九成網(wǎng)友已經(jīng)被打敗……

正巧小編最近也在研究驗(yàn)證碼，參考了許多網(wǎng)上案例，整理了一篇文章特分享給大家。

驗(yàn)證碼的一般編寫思路為：
       1.定義驗(yàn)證碼字符長(zhǎng)度;
       2.根據(jù)長(zhǎng)度隨機(jī)生成驗(yàn)證碼字符串;
       3.將驗(yàn)證碼字符串轉(zhuǎn)換成圖片形式，并在圖片中生成隨機(jī)噪聲點(diǎn)和聲線（對(duì)驗(yàn)證碼進(jìn)行模糊識(shí)別處理）;
       4.顯示結(jié)果。

 ///
 /// 生成隨機(jī)驗(yàn)證碼
 ///
 /// 驗(yàn)證碼長(zhǎng)度
 ///
 public string CreateIdentifyingCode(int CodeLen)
 {
 if (CodeLen < 1)
  return String.Empty;
 int num;
 string checkcode = String.Empty;
 Random random = new Random();
 for (int index = 0; index < CodeLen; index++)
 {
  num = random.Next();
  if (num % 2 == 0)
  checkcode += (char)('0' + (char)(num % 10));
  else
  checkcode += (char)('A' + (char)(num % 26));
 }
 return checkcode;
 }
-------------------------------------------------------------------------------------------------
 ///
 /// 生成驗(yàn)證碼圖片
 ///
 ///
 /// 
 private void CreateCheckCodeImage(string checkcode)
 {
  if (checkcode == null || checkcode.Trim() == String.Empty)
  return;
  //創(chuàng)建圖片大小
  System.Drawing.Bitmap image = new  System.Drawing.Bitmap((int)Math.Ceiling(checkcode.Length*12.5),22);
  //創(chuàng)建畫板
  Graphics graphic = Graphics.FromImage(image);
 
  try
  {
  Random random = new Random();
  graphic.Clear(Color.White);
  int x1 = 0, y1 = 0, x2 = 0, y2 = 0;
  //畫圖片背景噪聲線
  for (int index = 0; index < 25; index++)
  {
   x1 = random.Next(image.Width);
   y1 = random.Next(image.Height);
   x2 = random.Next(image.Width);
   y2 = random.Next(image.Height);
   graphic.DrawLine(new Pen(Color.Silver),x1,y1,x2,y2);
  }
  Font font = new System.Drawing.Font("Helvetica", 12, (FontStyle.Bold |FontStyle.Italic));
  LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height),Color.Blue,Color.DarkBlue,1.2f,true);
  graphic.DrawString(checkcode,font,brush,2,2);
 
  int x = 0;
  int y = 0;
  // 畫圖片的前景噪聲點(diǎn)
  for (int index = 0; index < 100; index++)
  {
   x = random.Next(image.Width);
   y = random.Next(image.Height);
   image.SetPixel(x,y,Color.FromArgb(random.Next()));
  }
  //畫圖片的邊框線
  graphic.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);
  //網(wǎng)頁(yè)響應(yīng)
  System.IO.MemoryStream ms = new System.IO.MemoryStream();
  image.Save(ms,System.Drawing.Imaging.ImageFormat.Gif);
  Response.ClearContent();
  Response.ContentType = "image/Gif";
  Response.BinaryWrite(ms.ToArray());
  }
  finally
  {
  graphic.Dispose();
  image.Dispose();
  }
 }

以上所生成的為簡(jiǎn)單的驗(yàn)證碼。接下來(lái)我從其他的博客中學(xué)習(xí)了其他形式的效果。

/* 圖片畫線特殊效果：貝塞爾曲線 */
  Graphics graph = Graphics.FromImage(image);
  graph.Clear(Color.WhiteSmoke);
  Point[] myArray ={
     new Point(random.Next(150),random.Next(50)),
     new Point(random.Next(150),random.Next(50)),
     new Point(random.Next(150),random.Next(50)),
     new Point(random.Next(150),random.Next(50)),
     new Point(random.Next(150),random.Next(50)),
     new Point(random.Next(150),random.Next(50)),
     new Point(random.Next(150),random.Next(50)),
     new Point(random.Next(150),random.Next(50)),
     new Point(random.Next(150),random.Next(50)),
     new Point(random.Next(150),random.Next(50))
    };
  Pen myPen = new Pen(Color.Blue, 1);
  GraphicsPath myPath = new GraphicsPath();
  myPath.AddBeziers(myArray);
  graph.DrawPath(myPen, myPath);

驗(yàn)證碼字符顏色變換效果：實(shí)現(xiàn)該效果，我們首先來(lái)定義一個(gè)顏色集合，然后通過(guò)for循環(huán)使其隨機(jī)改變字體顏色則可。

 #region 定義顏色數(shù)組
 Color[] colors = { Color.Blue, Color.Green, Color.Red, Color.Gold, Color.Black, Color.Chocolate, Color.Orange, Color.Purple };
 public Color[] Colors
 {
  get { return colors; }
  set { colors = value; }
 }
 #endregion
 Brush brush;
 int colornum;
 for(int i=0; i
 {
  colornum = random.Next(Colors.Length - 1);
  brush = new System.Drawing.SolidBrush(Colors[cindex]);
 
  //利用DrawString函數(shù)進(jìn)行顏色填充就可以了。
 }

 同樣的原理我們也可以定義一個(gè)字體的數(shù)組來(lái)進(jìn)行驗(yàn)證碼字體切換。代碼和顏色的類似，這里就不加以累贅。
接下來(lái)看看如何使得驗(yàn)證碼的字體進(jìn)行扭曲。

private const double PI = 3.1415926535897932384626433832795;
 private const double PI2 = 6.283185307179586476925286766559;
 ///
 /// 波形濾鏡效果函數(shù)
 ///
 ///
 ///
 ///
 ///
 ///
 public System.Drawing.Bitmap TwistImage(Bitmap srcbmp, double dmultvalue, double dphase)
 {
  System.Drawing.Bitmap destbmp = new Bitmap(srcbmp.Width,srcbmp.Height);
  System.Drawing.Graphics graph = System.Drawing.Graphics.FromImage(destbmp);
  //填充背景圖為白色
  graph.FillRectangle(new SolidBrush(System.Drawing.Color.White), 0, 0, destbmp.Width, destbmp.Height);
  graph.Dispose();
  double dbaselen = (double)destbmp.Width;
  for (int i = 0; i < destbmp.Width; i++)
  {
  for (int j = 0; j < destbmp.Height; j++)
  {
   double dx = 0;
   dx = (PI2 * (double)j) / dbaselen;
   dx += dphase;
 
   double dy = Math.Sin(dx);
 
   int noldx = 0, noldy = 0;
   noldx = i + (int)(dy * dmultvalue);
   noldy = 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;
 }

上面代碼是參考了這段代碼進(jìn)行的學(xué)習(xí)<C#.net 好用的驗(yàn)證碼代碼 漢字-變色-扭曲-波動(dòng) >，代碼如下


using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Drawing;
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;

public partial class study_CheckCode2 : System.Web.UI.Page
{
 protected void Page_Load(object sender, EventArgs e)
 {
 string code = CreateVerifyCode();  //取隨機(jī)碼
 CreateImageOnPage(code, this.Context); // 輸出圖片
 Response.Cookies.Add(new HttpCookie("CheckCode", code.ToUpper()));// 使用Cookies取驗(yàn)證碼的值
 }

 #region 驗(yàn)證碼長(zhǎng)度(默認(rèn)4個(gè)驗(yàn)證碼的長(zhǎng)度)
 int length = 4;
 public int Length
 {
 get { return length; }
 set { length = value; }
 }
 #endregion

 #region 驗(yàn)證碼字體大小(為了顯示扭曲效果，默認(rèn)40像素，可以自行修改)
 int fontSize = 40;
 public int FontSize
 {
 get { return fontSize; }
 set { fontSize = value; }
 }
 #endregion

 #region 邊框補(bǔ)(默認(rèn)1像素)
 int padding = 2;
 public int Padding
 {
 get { return padding; }
 set { padding = value; }
 }
 #endregion

 #region 是否輸出燥點(diǎn)(默認(rèn)不輸出)
 bool chaos = true;
 public bool Chaos
 {
 get { return chaos; }
 set { chaos = value; }
 }
 #endregion

 #region 輸出燥點(diǎn)的顏色(默認(rèn)灰色)
 Color chaosColor = Color.LightGray;
 public Color ChaosColor
 {
 get { return chaosColor; }
 set { chaosColor = value; }
 }
 #endregion

 #region 自定義背景色(默認(rèn)白色)
 Color backgroundColor = Color.White;
 public Color BackgroundColor
 {
 get { return backgroundColor; }
 set { backgroundColor = value; }
 }
 #endregion

 #region 自定義隨機(jī)顏色數(shù)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 自定義字體數(shù)組
 string[] fonts = { "Arial", "Georgia" };
 public string[] Fonts
 {
 get { return fonts; }
 set { fonts = value; }
 }
 #endregion

 #region 自定義隨機(jī)碼字符串序列(使用逗號(hào)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";
 string codeSerial = "阿,保,持,的,法,規(guī),和,東,三,省,問(wèn),我,惹,你,誒,沒(méi),改,變,揍,屁,股,吧";
 public string CodeSerial
 {
 get { return codeSerial; }
 set { codeSerial = value; }
 }
 #endregion

 #region 產(chǎn)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（Edit By 51aspx.com）
 /// </summary>
 /// <param name="srcBmp">圖片路徑</param>
 /// <param name="bXDir">如果扭曲則選擇為True</param>
 /// <param name="dMultValue">波形的幅度倍數(shù)，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(qū)間[0-2*PI)</param>
 /// <returns></returns>
 public System.Drawing.Bitmap TwistImage(Bitmap srcBmp, bool bXDir, double dMultValue, double dPhase)
 {
 System.Drawing.Bitmap destBmp = new Bitmap(srcBmp.Width, srcBmp.Height);

 // 將位圖背景填充為白色
 System.Drawing.Graphics graph = System.Drawing.Graphics.FromImage(destBmp);
 graph.FillRectangle(new SolidBrush(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);

  // 取得當(dāng)前點(diǎn)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 生成校驗(yàn)碼圖片
 public Bitmap CreateImageCode(string code)
 {
 int fSize = FontSize;
 int fWidth = fSize + Padding;

 int imageWidth = (int)(code.Length * fWidth) + 30 + 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(jī)生成的燥點(diǎn)
 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(jī)字體和顏色的驗(yàn)證碼字符
 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);
 }

 //畫一個(gè)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(chǎn)生波形（Add By 51aspx.com）
 image = TwistImage(image, true, 8, 4);

 return image;
 }
 #endregion

 #region 將創(chuàng)建好的圖片輸出到頁(yè)面
 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 生成隨機(jī)字符碼
 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

}

一年一度的搶票熱潮又開(kāi)始了，希望大家都能順利買到回家的火車篇，回家過(guò)年，突然感覺(jué)有點(diǎn)年味了，一年又一年，時(shí)間都去哪了，小小的感慨一下……

言歸正傳，這就是為大家分享的C#驗(yàn)證碼程序，和12306驗(yàn)證碼差多了，不過(guò)也是小編的學(xué)習(xí)收獲吧！大家也可以結(jié)合下面這兩篇文章進(jìn)行學(xué)習(xí)：

《12306動(dòng)態(tài)驗(yàn)證碼啟發(fā)之ASP.NET實(shí)現(xiàn)動(dòng)態(tài)GIF驗(yàn)證碼(附源碼)》

《12306驗(yàn)證碼破解思路分享》

希望本文所述對(duì)大家學(xué)習(xí)驗(yàn)證碼技術(shù)有所幫助。

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