验证码中的其中两种：
前端页面：
1 <li class="yzm"> 2 <input type="text" name="Verify" class="input_text icon_3" placeholder="请输入验证码" /> 3 <span class="yam_pic"> 4 @*<img src="~/sinoair/img/yzm.png" />*@ 5 <img style="82px;height:40px;text-align:left;float:left;" src="" id="verify_code_img" onclick="verify()"> 6 7 </span> 8 </li>
js:
1 <script type="text/javascript"> 2 $(document).ready(function () { 3 $('#verify_code_img').attr('src', '/Login/ShowValidateCode?id=' + Math.random()); 4 }); 5 function verify() { 6 $('#verify_code_img').attr('src', '/Login/ShowValidateCode?id=' + Math.random()); 7 } 8 9 </script>
控制器:
1 #region 返回验证码 2 //返回验证码 3 [ActionDescription("验证码")] 4 public ActionResult ShowValidateCode() 5 { 6 //string code = new ValidateCode().CreateValidateCode(4);//生成验证码，传几就是几位验证码["verify_code"] 7 ////Session["verify_code"] = code; //保存已生成的验证码 8 //HttpContext.Session.Set<string>("verify_code", code); 9 //byte[] buffer = new ValidateCode().CreateValidateGraphic(code);//把验证码画到画布 10 11 byte[] buffer = GetVerifyCode(); 12 return File(buffer, "image/jpeg");//方法二 13 //return File(buffer, "image/jpeg");//方法一 14 } 15 16 #endregion
验证码方法一：（此方法比较麻烦，样式比较单一，不好看）
1 #region 创建验证码 方法一 2 3 public class ValidateCode 4 { 5 public ValidateCode() 6 { 7 } 8 /// <summary> 9 /// 验证码的最大长度 10 /// </summary> 11 public int MaxLength 12 { 13 get { return 10; } 14 } 15 /// <summary> 16 /// 验证码的最小长度 17 /// </summary> 18 public int MinLength 19 { 20 get { return 1; } 21 } 22 /// <summary> 23 /// 生成验证码 24 /// </summary> 25 /// <param name="length">指定验证码的长度</param> 26 /// <returns></returns> 27 public string CreateValidateCode(int length) 28 { 29 int[] randMembers = new int[length]; 30 int[] validateNums = new int[length]; 31 string validateNumberStr = ""; 32 //生成起始序列值 33 int seekSeek = unchecked((int)DateTime.Now.Ticks); 34 Random seekRand = new Random(seekSeek); 35 int beginSeek = (int)seekRand.Next(0, Int32.MaxValue - length * 10000); 36 int[] seeks = new int[length]; 37 for (int i = 0; i < length; i++) 38 { 39 beginSeek += 10000; 40 seeks[i] = beginSeek; 41 } 42 //生成随机数字 43 for (int i = 0; i < length; i++) 44 { 45 Random rand = new Random(seeks[i]); 46 int pownum = 1 * (int)Math.Pow(10, length); 47 randMembers[i] = rand.Next(pownum, Int32.MaxValue); 48 } 49 //抽取随机数字 50 for (int i = 0; i < length; i++) 51 { 52 string numStr = randMembers[i].ToString(); 53 int numLength = numStr.Length; 54 Random rand = new Random(); 55 int numPosition = rand.Next(0, numLength - 1); 56 validateNums[i] = Int32.Parse(numStr.Substring(numPosition, 1)); 57 } 58 //生成验证码 59 for (int i = 0; i < length; i++) 60 { 61 validateNumberStr += validateNums[i].ToString(); 62 } 63 return validateNumberStr; 64 } 65 66 /// <summary> 67 /// 得到验证码图片的长度 68 /// </summary> 69 /// <param name="validateNumLength">验证码的长度</param> 70 /// <returns></returns> 71 public static int GetImageWidth(int validateNumLength) 72 { 73 return (int)(validateNumLength * 12.0); 74 } 75 /// <summary> 76 /// 得到验证码的高度 77 /// </summary> 78 /// <returns></returns> 79 public static double GetImageHeight() 80 { 81 return 22.5; 82 } 83 84 85 86 87 //C# MVC 升级版 88 /// <summary> 89 /// 创建验证码的图片 90 /// </summary> 91 /// <param name="containsPage">要输出到的page对象</param> 92 /// <param name="validateNum">验证码</param> 93 public byte[] CreateValidateGraphic(string validateCode) 94 { 95 Bitmap image = new Bitmap((int)Math.Ceiling(validateCode.Length * 12.0), 22); 96 Graphics g = Graphics.FromImage(image); 97 try 98 { 99 //生成随机生成器 100 Random random = new Random(); 101 //清空图片背景色 102 g.Clear(Color.White); 103 //画图片的干扰线 104 for (int i = 0; i < 25; i++) 105 { 106 int x1 = random.Next(image.Width); 107 int x2 = random.Next(image.Width); 108 int y1 = random.Next(image.Height); 109 int y2 = random.Next(image.Height); 110 g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2); 111 } 112 Font font = new Font("Arial", 12, (FontStyle.Bold | FontStyle.Italic)); 113 LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), 114 Color.YellowGreen, Color.YellowGreen, 1.2f, true); 115 g.DrawString(validateCode, font, brush, 3, 2); 116 //画图片的前景干扰点 117 //for (int i = 0; i < 100; i++) 118 //{ 119 // int x = random.Next(image.Width); 120 // int y = random.Next(image.Height); 121 // image.SetPixel(x, y, Color.FromArgb(random.Next())); 122 //} 123 //画图片的边框线 124 g.DrawRectangle(new Pen(Color.White), 0, 0, image.Width - 1, image.Height - 1); 125 //保存图片数据 126 MemoryStream stream = new MemoryStream(); 127 image.Save(stream, ImageFormat.Jpeg); 128 //输出图片流 129 return stream.ToArray(); 130 } 131 finally 132 { 133 g.Dispose(); 134 image.Dispose(); 135 } 136 } 137 } 138 #endregion
验证码方法二：（简单好看）
1 #region 验证码方法二字体彩色 2 /// <summary> 3 /// 创建验证码 4 /// </summary> 5 /// <returns></returns> 6 public byte[] GetVerifyCode() 7 { 8 int codeW = 80; 9 int codeH = 30; 10 int fontSize = 16; 11 string chkCode = string.Empty; 12 Color[] color = { Color.Black, Color.Red, Color.Blue, Color.Green, Color.Orange, Color.Brown, Color.DarkBlue, Color.PaleGreen }; 13 string[] font = { "Times New Roman" }; 14 char[] character = { '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'd', 'e', 'f', 'h', 'k', 'm', 'n', 'r', 'x', 'y', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'K', 'L', 'M', 'N', 'P', 'R', 'S', 'T', 'W', 'X', 'Y' }; 15 //生成验证码字符串 16 Random rnd = new Random(); 17 for (int i = 0; i < 4; i++) 18 { 19 chkCode += character[rnd.Next(character.Length)]; 20 } 21 //写入Session用于验证码校验，可以对校验码进行加密，提高安全性 22 HttpContext.Session.Set<string>("verify_code", chkCode); 23 24 //创建画布 25 Bitmap bmp = new Bitmap(codeW, codeH); 26 Graphics g = Graphics.FromImage(bmp); 27 g.Clear(Color.Linen); 28 29 //画噪线 30 for (int i = 0; i < 3; i++) 31 { 32 int x1 = rnd.Next(codeW); 33 int y1 = rnd.Next(codeH); 34 int x2 = rnd.Next(codeW); 35 int y2 = rnd.Next(codeH); 36 37 Color clr = color[rnd.Next(color.Length)]; 38 g.DrawLine(new Pen(clr), x1, y1, x2, y2); 39 } 40 //画验证码 41 for (int i = 0; i < chkCode.Length; i++) 42 { 43 string fnt = font[rnd.Next(font.Length)]; 44 Font ft = new Font(fnt, fontSize); 45 Color clr = color[rnd.Next(color.Length)]; 46 g.DrawString(chkCode[i].ToString(), ft, new SolidBrush(clr), (float)i * 18, (float)0); 47 } 48 //将验证码写入图片内存流中，以image/png格式输出 49 MemoryStream ms = new MemoryStream(); 50 try 51 { 52 bmp.Save(ms, ImageFormat.Png); 53 return ms.ToArray(); 54 } 55 catch (Exception ex) 56 { 57 return null; 58 } 59 finally 60 { 61 g.Dispose(); 62 bmp.Dispose(); 63 } 64 } 65 66 #endregion
#region创建验证码方法一
publicclassValidateCode
{
public ValidateCode()
{
}
///<summary>
///验证码的最大长度
///</summary>
publicint MaxLength
{
get { return 10; }
}
///<summary>
///验证码的最小长度
///</summary>
publicint MinLength
{
get { return 1; }
}
///<summary>
///生成验证码
///</summary>
///<param name="length">指定验证码的长度</param>
///<returns></returns>
publicstring CreateValidateCode(int length)
{
int[] randMembers = newint[length];
int[] validateNums = newint[length];
string validateNumberStr = "";
//生成起始序列值
int seekSeek = unchecked((int)DateTime.Now.Ticks);
Random seekRand = new Random(seekSeek);
int beginSeek = (int)seekRand.Next(0, Int32.MaxValue - length * 10000);
int[] seeks = newint[length];
for (int i = 0; i < length; i++)
{
beginSeek += 10000;
seeks[i] = beginSeek;
}
//生成随机数字
for (int i = 0; i < length; i++)
{
Random rand = new Random(seeks[i]);
int pownum = 1 * (int)Math.Pow(10, length);
randMembers[i] = rand.Next(pownum, Int32.MaxValue);
}
//抽取随机数字
for (int i = 0; i < length; i++)
{
string numStr = randMembers[i].ToString();
int numLength = numStr.Length;
Random rand = new Random();
int numPosition = rand.Next(0, numLength - 1);
validateNums[i] = Int32.Parse(numStr.Substring(numPosition, 1));
}
//生成验证码
for (int i = 0; i < length; i++)
{
validateNumberStr += validateNums[i].ToString();
}
return validateNumberStr;
}
///<summary>
///得到验证码图片的长度
///</summary>
///<param name="validateNumLength">验证码的长度</param>
///<returns></returns>
publicstaticint GetImageWidth(int validateNumLength)
{
return (int)(validateNumLength * 12.0);
}
///<summary>
///得到验证码的高度
///</summary>
///<returns></returns>
publicstaticdouble GetImageHeight()
{
return 22.5;
}
//C# MVC 升级版
///<summary>
///创建验证码的图片
///</summary>
///<param name="containsPage">要输出到的page对象</param>
///<param name="validateNum">验证码</param>
publicbyte[] CreateValidateGraphic(string validateCode)
{
Bitmap image = new Bitmap((int)Math.Ceiling(validateCode.Length * 12.0), 22);
Graphics g = Graphics.FromImage(image);
try
{
//生成随机生成器
Random random = new Random();
//清空图片背景色
g.Clear(Color.White);
//画图片的干扰线
for (int i = 0; i < 25; i++)
{
int x1 = random.Next(image.Width);
int x2 = random.Next(image.Width);
int y1 = random.Next(image.Height);
int y2 = random.Next(image.Height);
g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
}
Font font = new Font("Arial", 12, (FontStyle.Bold | FontStyle.Italic));
LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height),
Color.YellowGreen, Color.YellowGreen, 1.2f, true);
g.DrawString(validateCode, font, brush, 3, 2);
//画图片的前景干扰点
//for (int i = 0; i < 100; i++)
//{
// int x = random.Next(image.Width);
// int y = random.Next(image.Height);
// image.SetPixel(x, y, Color.FromArgb(random.Next()));
//}
//画图片的边框线
g.DrawRectangle(new Pen(Color.White), 0, 0, image.Width - 1, image.Height - 1);
//保存图片数据
MemoryStream stream = new MemoryStream();
image.Save(stream, ImageFormat.Jpeg);
//输出图片流
return stream.ToArray();
}
finally
{
g.Dispose();
image.Dispose();
}
}
}
#endregion