———html
<
td
>验证码:</
td
>
<
td
>
<
img
src="/Login/CheckCode?ID=1" id="imgCode" alt="单击可刷新" onclick="ClickRemoveChangeCode()" />
<
div
style="float:right; margin-top: 5px;">
<
a
href="javascript:void(0)" rel="external nofollow" onclick="ClickRemoveChangeCode();return false;">看不清,换一张</
a
>
</
div
>
</
td
>
———–jquery
12345 | //单击重新改变验证码 function ClickRemoveChangeCode() { var code = $( "#imgCode" ).attr( "src" ); $( "#imgCode" ).attr( "src" , code + "1" ); } |
————asp.net mvc 返回文件地址
1234567891011121314 | /// <summary> /// 验证码的校验 /// </summary> /// <param name="context"></param> /// <returns></returns> public ActionResult CheckCode() { //生成验证码 ValidateCode validateCode = new ValidateCode(); string code = validateCode.CreateValidateCode(4); Session[ "ValidateCode" ] = code; byte [] bytes = validateCode.CreateValidateGraphic(code); return File(bytes, @"image/jpeg" ); }
/// <summary> string cnum = Session[“ValidateCode”] == null ? “”: Session[“ValidateCode”].ToString(); if (num== cnum && !string.IsNullOrEmpty(num)) |
—-生成验证码和绘制背景的类
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133 | public class ValidateCode { public ValidateCode() { } /// <summary> /// 验证码的最大长度 /// </summary> public int MaxLength { get { return 10; } } /// <summary> /// 验证码的最小长度 /// </summary> public int 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> public string CreateValidateCode( int length) { int [] randMembers = new int [length]; int [] validateNums = new int [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 = new int [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; } //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> public byte [] 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.Blue, Color.DarkRed, 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.Silver), 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(); } } /// <summary> /// 得到验证码图片的长度 /// </summary> /// <param name="validateNumLength">验证码的长度</param> /// <returns></returns> public static int GetImageWidth( int validateNumLength) { return ( int )(validateNumLength * 12.0); } /// <summary> /// 得到验证码的高度 /// </summary> /// <returns></returns> public static double GetImageHeight() { return 22.5; } } |