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【转】asp.net mvc生成验证码

發布時間：2024/6/5 asp.net 39 豆豆

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ASP.NET MVC實現網站驗證碼功能

網站添加驗證碼，主要為防止機器人程序批量注冊，或對特定的注冊用戶用特定程序暴力破解方式，以進行不斷的登錄、灌水等危害網站的操作。驗證碼被廣泛應用在注冊、登錄、留言等提交信息到服務器端處理的頁面中。

???? 在ASP.NET網站中應用驗證碼是很容易的，網上有很多的解決方案。最近在做一個OA項目，因系統采用的ASP.NET MVC框架，同樣在登錄頁中需用到驗證碼，故需將原來在ASP.NET網站中使用的驗證碼移植到ASP.NET MVC中。

???? 原ASP.NET網站用來生成驗證碼的類文件ValidateCode.cs：

Code
using?System;
using?System.Drawing;
using?System.Drawing.Imaging;
using?System.Web.UI;
using?System.Drawing.Drawing2D;
using?System.IO;

namespace?SeniOA.MVC
{
????///?<summary>
????///?生成驗證碼的類
????///?</summary>
????public?class?ValidateCode
????{
????????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="containsPage">要輸出到的page對象</param>
????????///?<param?name="validateNum">驗證碼</param>
????????public?void?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
????????????????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
????????????????containsPage.Response.Clear();
????????????????containsPage.Response.ContentType?=?"image/jpeg";
????????????????containsPage.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;
????????}
????}
}

using?System;
using?System.Drawing;
using?System.Drawing.Imaging;
using?System.Web.UI;
using?System.Drawing.Drawing2D;
using?System.IO;

namespace?SeniOA.MVC
{
????/**////?<summary>
????///?生成驗證碼的類
????///?</summary>
????public?class?ValidateCode
????{
????????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="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
????????????????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
????????????????containsPage.Response.Clear();
????????????????containsPage.Response.ContentType?=?"image/jpeg";
????????????????containsPage.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;
????????}
????}
}??? 為適合ASP.NET MVC框架，修改其輸出圖片流的方法CreateValidateGraphic為：

Code
///?<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
????????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();
????}
}

??? 在Controller.cs中，添加Action，用來設置將生成的驗證碼存入Session，并輸出驗證碼圖片：

Code
public?ActionResult?GetValidateCode()
{
????ValidateCode?vCode?=?new?ValidateCode();
????string?code?=?vCode.CreateValidateCode(5);
????Session["ValidateCode"]?=?code;
????byte[]?bytes?=?vCode.CreateValidateGraphic(code);
????return?File(bytes,?@"image/jpeg");
}

??? 調用方式為：在需要使用驗證碼的頁面中，加入<img>標簽：
<img id="valiCode" style="cursor: pointer;" src="../Account/GetValidateCode" alt="驗證碼" />

??? 效果如下圖：

??? 到于Account/Login這個Action中的處理，只需加入對Session中驗證碼的判斷：

Code
[AcceptVerbs(HttpVerbs.Post)]
public?ActionResult?Login(string?userName,?string?password,?bool?rememberMe,?string?returnUrl,string?code)
{
????if?(Session["ValidateCode"].ToString()?!=?code)
????{
????????ModelState.AddModelError("code",?"validate?code?is?error");
????????return?View();
????}

????//此處驗證用戶名、密碼
????if?(!ValidateLogOn(userName,?password))
????{
????????return?View();
????}

????//驗證成功
????FormsAuthentication.SetAuthCookie(userName,?rememberMe);

????if?(!String.IsNullOrEmpty(returnUrl))
????{
????????return?Redirect(returnUrl);
????}
????else
????{
????????return?RedirectToAction("Index",?"Home");
????}
}

??? 為實現登錄頁中，點擊圖片切換驗證碼，可以登錄頁中加入此JS代碼實現刷新驗證碼：

JS Code
<script?type="text/javascript"?src="http://www.cnblogs.com/Scripts/jquery-1.3.2-vsdoc.js"></script>
<script?type="text/javascript">
????$(function()?{
????$("#valiCode").bind("click",?function()?{
????????this.src?=?"../Account/GetValidateCode?time="?+?(new?Date()).getTime();
????????});
????????//alert("good");
????});
</script>

??? 至此，ASP.NET MVC中已成功實現驗證碼功能。

轉載于:https://www.cnblogs.com/jianjialin/archive/2009/12/16/1625780.html

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