1.一般处理程序
/// <summary> /// 验证码生成类 /// </summary> public class verify_code : IHttpHandler, IRequiresSessionState { public void ProcessRequest(HttpContext context) { int codeW = 80; int codeH = 22; int fontSize = 16; string chkCode = string.Empty; //颜色列表，用于验证码、噪线、噪点 Color[] color = { Color.Black, Color.Red, Color.Blue, Color.Green, Color.Orange, Color.Brown, Color.Brown, Color.DarkBlue }; //字体列表，用于验证码 string[] font = { "Times New Roman", "Verdana", "Arial", "Gungsuh", "Impact" }; //验证码的字符集，去掉了一些容易混淆的字符 char[] character = { '2', '3', '4', '5', '6', '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' }; Random rnd = new Random(); //生成验证码字符串 for (int i = 0; i < 4; i++) { chkCode += character[rnd.Next(character.Length)]; } //写入Session context.Session[DTKeys.SESSION_CODE] = chkCode; //创建画布 Bitmap bmp = new Bitmap(codeW, codeH); Graphics g = Graphics.FromImage(bmp); g.Clear(Color.White); //画噪线 for (int i = 0; i < 1; i++) { int x1 = rnd.Next(codeW); int y1 = rnd.Next(codeH); int x2 = rnd.Next(codeW); int y2 = rnd.Next(codeH); Color clr = color[rnd.Next(color.Length)]; g.DrawLine(new Pen(clr), x1, y1, x2, y2); } //画验证码字符串 for (int i = 0; i < chkCode.Length; i++) { string fnt = font[rnd.Next(font.Length)]; Font ft = new Font(fnt, fontSize); Color clr = color[rnd.Next(color.Length)]; g.DrawString(chkCode[i].ToString(), ft, new SolidBrush(clr), (float)i * 18 + 2, (float)0); } //画噪点 for (int i = 0; i < 100; i++) { int x = rnd.Next(bmp.Width); int y = rnd.Next(bmp.Height); Color clr = color[rnd.Next(color.Length)]; bmp.SetPixel(x, y, clr); } //清除该页输出缓存，设置该页无缓存 context.Response.Buffer = true; context.Response.ExpiresAbsolute = System.DateTime.Now.AddMilliseconds(0); context.Response.Expires = 0; context.Response.CacheControl = "no-cache"; context.Response.AppendHeader("Pragma", "No-Cache"); //将验证码图片写入内存流，并将其以 "image/Png" 格式输出 MemoryStream ms = new MemoryStream(); try { bmp.Save(ms, ImageFormat.Png); context.Response.ClearContent(); context.Response.ContentType = "image/Png"; context.Response.BinaryWrite(ms.ToArray()); } finally { //显式释放资源 bmp.Dispose(); g.Dispose(); } } public bool IsReusable { get { return false; } } }
2.页面使用
<dl>
<dt>验 证 码：</dt>
<dd>
<input id="txtCode" name="txtCode" type="text" class="input code" placeholder="输入验证码" datatype="s4-20" nullmsg="请输入右边显示的验证码" sucmsg=" " />
<a class="send" title="点击切换验证码" href="javascript:;" onclick="ToggleCode(this, 'verify_code.ashx');return false;">
<img src="verify_code.ashx" width="80" height="22" />
</a>
</dd>
</dl>
3.切换验证码
//切换验证码 function ToggleCode(obj, codeurl) { $(obj).children("img").eq(0).attr("src", codeurl + "?time=" + Math.random()); return false; }
4.MVC生成验证码
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,out string retInfo) { //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; #region 字符数字随机 //StringBuilder sbcode = new StringBuilder(); //string strcode = "abcdefghjkmnpqrstuvwxyzABCDEFGHJKMNPQRSTUVWXYZ23456789"; //Random rand = new Random(); //for (int i = 0; i < length; i++) //{ // sbcode.Append(strcode[rand.Next(0, strcode.Length)].ToString()); //} //return sbcode.ToString(); #endregion #region 验证码 +- 计算 string retcode=""; retInfo = "siweicn"; int seekSeek = unchecked((int)DateTime.Now.Ticks); Random rand = new Random(seekSeek); string stroper = "+*"; string oper = stroper[rand.Next(0, stroper.Length)].ToString(); string k1 = string.Empty; string k2 = string.Empty; switch (oper) { case "*": { k1 = rand.Next(1, 10).ToString(); k2 = rand.Next(1, 10).ToString(); retInfo = (int.Parse(k1) * int.Parse(k2)).ToString(); retcode = k1 + "* " + k2 + "=?"; break; } case "+": { k1 = rand.Next(1, 10).ToString(); k2 = rand.Next(1, 10).ToString(); retInfo = (int.Parse(k1) + int.Parse(k2)).ToString(); retcode = k1 + "+ " + k2 + "=?"; break; } } return retcode; #endregion } /// <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 void CreateValidateGraphic(string validateCode) { //Bitmap image = new Bitmap((int)Math.Ceiling(validateCode.Length * 13.0), 31); Bitmap image = new Bitmap(82, 24); 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, 0, 3); //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, 4), 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 HttpContext.Current.Response.Clear(); HttpContext.Current.Response.ContentType = "image/jpeg"; HttpContext.Current.Response.BinaryWrite(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; } }
5.控制器中创建验证码
/// <summary> /// 获取验证码（登录页面） /// </summary> [AllowAnonymous] [OutputCache(Location = OutputCacheLocation.None)] public void VCode() { var code = new ValidateCode(); string retInfo; var codeStr = code.CreateValidateCode(5, out retInfo); Session["vcode"] = retInfo; code.CreateValidateGraphic(codeStr); }
6.view页面使用验证码
<li> 验证码： <input id="code" type="text" name="vcode" style=" 116px;" placeholder="输入计算结果" /> <img id="vcode" style="80px;height:22px;border:1px solid #449cde; margin-bottom:-8px; cursor:pointer" alt="验证码" title="点击刷新验证码" src="@Url.Action("VCode", "控制器名称")" /> </li>
7.点击刷新重置验证码
$("#vcode").click(function () {
var $this = $(this);
$this.attr("src", '@Url.Action("VCode", "控制器名称")?_=' + new Date().getTime());
})