C#系統登錄隨機驗證碼生成及其調用方法
阿新 • • 發佈：2018-11-15
方法 string script draw ESS summary fin 就是 clas
話不多說，直接上代碼
public ValidateCode() { } /// <summary> /// 驗證碼的最大長度 /// </summary> public int MaxLength { get { return 10; } } /// <summary> /// 驗證碼的最小長度 /// </summary> public int MinLength {get { return 1; } } /// <summary> /// 生成驗證碼 /// </summary> /// <param name="length">指定驗證碼的長度</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; } //生成隨機數字 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); } //抽取隨機數字 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)); } //生成驗證碼 for (int i = 0; i < length; i++) { validateNumberStr += validateNums[i].ToString(); } return validateNumberStr; } /// <summary> /// 創建驗證碼的圖片 /// </summary> /// <param name="context">要輸出到的page對象</param> /// <param name="validateNum">驗證碼</param> public void CreateValidateGraphic(string validateCode, HttpContext context) { Bitmap image = new Bitmap((int)Math.Ceiling(validateCode.Length * 12.0), 22); Graphics g = Graphics.FromImage(image); try { //生成隨機生成器 Random random = new Random(); //清空圖片背景色 g.Clear(Color.White); //畫圖片的幹擾線 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); //畫圖片的前景幹擾點 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); //保存圖片數據 MemoryStream stream = new MemoryStream(); image.Save(stream, ImageFormat.Jpeg); //輸出圖片流 context.Response.Clear(); context.Response.ContentType = "image/jpeg"; context.Response.BinaryWrite(stream.ToArray()); } finally { g.Dispose(); image.Dispose(); } } /// <summary> /// 得到驗證碼圖片的長度 /// </summary> /// <param name="validateNumLength">驗證碼的長度</param> /// <returns></returns> public static int GetImageWidth(int validateNumLength) { return (int)(validateNumLength * 12.0); } /// <summary> /// 得到驗證碼的高度 /// </summary> /// <returns></returns> public static double GetImageHeight() { return 22.5; } //C# MVC 升級版 /// <summary> /// 創建驗證碼的圖片 /// </summary> /// <param name="containsPage">要輸出到的page對象</param> /// <param name="validateNum">驗證碼</param> public byte[] CreateValidateGraphic(string validateCode) { Bitmap image = new Bitmap((int)Math.Ceiling(validateCode.Length * 12.0), 22); Graphics g = Graphics.FromImage(image); try { //生成隨機生成器 Random random = new Random(); //清空圖片背景色 g.Clear(Color.White); //畫圖片的幹擾線 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); //畫圖片的前景幹擾點 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); //保存圖片數據 MemoryStream stream = new MemoryStream(); image.Save(stream, ImageFormat.Jpeg); //輸出圖片流 return stream.ToArray(); } finally { g.Dispose(); image.Dispose(); } }
其中有兩個根據數字和字母生成圖片驗證碼的方法，相信大家能夠明白，第一種是常規的WebForm後臺調用的方法，可以i直接返回相應的驗證碼圖片，第二種則是專門為ASP.NET準備的方法，其實就是篩檢了一點東西，然後傳入參數也發生了相應的變化，當然，還有點擊“看不清，換一張”的時候，會異步獲取新的數據，實現方法在文章末尾。
在MVC中的Controller中如下調用：
public ActionResult ShowVCode() { ValidateCode vliateCode = new ValidateCode(); string code = vliateCode.CreateValidateCode(4);//產生驗證碼 Session["validateCode"] = code; byte[] buffer = vliateCode.CreateValidateGraphic(code);//將驗證碼畫到畫布上. return File(buffer, "image/jpeg"); }
前臺頁面中如下調用：
<tr>
<td>
驗證碼：
</td>
<td align="left">
<input type="text" class="login-text" id="code" name="vCode" value="1" />
</td>
</tr>
<tr>
<td></td>
<td>
<img id="imgCode" src="/Login/ShowVCode?id=2" style="float: left; height: 24px;" />
<div style="float: left; margin-left: 5px; margin-top: 10px;">
<a href="javascript:void(0)" onclick="changeCheckCode();return false;">看不清，換一張</a>
</div>
</td>
</tr>
實現的效果如下圖所示：
點擊“看不清換一張”切換驗證碼代碼如下：
<script type="text/javascript"> $(function () { $("#imgCode").click(changeCheckCode); }); //改變當前圖片地址 function changeCheckCode() { var old = $("#imgCode").attr("src"); var now = new Date(); var str = old + now.getDay() + now.getSeconds() + now.getMilliseconds(); $("#imgCode").attr("src",str ); } </script>
如果對大家有幫助，希望點個贊 哈哈
C#系統登錄隨機驗證碼生成及其調用方法