這篇文章給大家介紹如何在asp.net中使用mvc驗(yàn)證碼類,內(nèi)容非常詳細(xì),感興趣的小伙伴們可以參考借鑒,希望對(duì)大家能有所幫助。
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namespace QJW.VerifyCode { //用法: //public FileContentResult CreateValidate() //{ // ValidateCode vCode = new ValidateCode(); // string code = vCode.CreateValidateCode(5); // Session["ValidateCode"] = code; // byte[] bytes = vCode.CreateValidateGraphic(code); // return File(bytes, "image/JPEG"); //} public class ValidateCode { public ValidateCode() { } /// <summary> /// 驗(yàn)證碼的較大長(zhǎng)度 /// </summary> public int MaxLength { get { return 10; } } /// <summary> /// 驗(yàn)證碼的最小長(zhǎng)度 /// </summary> public int MinLength { get { return 1; } } /// <summary> /// 生成驗(yàn)證碼 /// </summary> /// <param name="length">指定驗(yàn)證碼的長(zhǎng)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; } //生成隨機(jī)數(shù)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); } //抽取隨機(jī)數(shù)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)); } //生成驗(yàn)證碼 for (int i = 0; i < length; i++) { validateNumberStr += validateNums[i].ToString(); } return validateNumberStr; } /// <summary> /// 創(chuàng)建驗(yàn)證碼的圖片 /// </summary> /// <param name="containsPage">要輸出到的page對(duì)象</param> /// <param name="validateNum">驗(yàn)證碼</param> public byte[] CreateValidateGraphic(string validateCode) { Bitmap image = new Bitmap((int)Math.Ceiling(validateCode.Length * 12.0), 22); Graphics g = Graphics.FromImage(image); try { //生成隨機(jī)生成器 Random random = new Random(); //清空?qǐng)D片背景色 g.Clear(Color.White); //畫圖片的干擾線 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); //畫圖片的前景干擾點(diǎn) 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())); } //畫圖片的邊框線 g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1); //保存圖片數(shù)據(jù) MemoryStream stream = new MemoryStream(); image.Save(stream, ImageFormat.Jpeg); //輸出圖片流 return stream.ToArray(); } finally { g.Dispose(); image.Dispose(); } } /// <summary> /// 得到驗(yàn)證碼圖片的長(zhǎng)度 /// </summary> /// <param name="validateNumLength">驗(yàn)證碼的長(zhǎng)度</param> /// <returns></returns> public static int GetImageWidth(int validateNumLength) { return (int)(validateNumLength * 12.0); } /// <summary> /// 得到驗(yàn)證碼的高度 /// </summary> /// <returns></returns> public static double GetImageHeight() { return 22.5; } } }
使用方法
public FileContentResult CreateValidate() { ValidateCode vCode = new ValidateCode(); string code = vCode.CreateValidateCode(5); Session["ValidateCode"] = code; byte[] bytes = vCode.CreateValidateGraphic(code); return File(bytes, "image/JPEG"); }
HTML
<a href="javascript:;" onclick="reloadcode();"><img id="safecode" src="/common/CreateValidate" alt="" /></a>
視圖JS
function reloadcode() { var verify = document.getElementById('safecode'); verify.setAttribute('src', '/common/CreateValidate?' + Math.random()); }
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