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MVC+EasyUI+三層新聞網(wǎng)站建立驗證碼生成（三）

更新時間：2017年07月06日 11:48:08 作者：劉指導(dǎo)

這篇文章主要為大家詳細(xì)介紹了MVC+EasyUI+三層新聞網(wǎng)站建立的第三篇，教大家如何生成驗證碼，具有一定的參考價值，感興趣的小伙伴們可以參考一下

我們在項目中的NewWeb.Common類庫里面建立一個類用來存放生成驗證碼的代碼。

這里我類的名字叫 ValidateCode

生成驗證碼（ValidateCode）類的代碼：

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Web;

namespace NewWeb.Common
{
  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(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));
        }
        //生成驗證碼
        for (int i = 0; i < length; i++)
        {
          validateNumberStr += validateNums[i].ToString();
        }
        return validateNumberStr;
      }
      /// <summary>
      /// 創(chuàng)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(shù)據(jù)
          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(chuàng)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(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();
        }
      }
    }
  
}

這時需要在程序中引入兩個命名空間 System.Drawing和System.Web。

完成之后到LoginController控制器里面去新建一個ActionResult 就叫ValidateCode 用于生成驗證碼。（這里要先對NewWeb.Common引用）

生成驗證碼代碼如下:

 public ActionResult ValidateCode()
    {
      Common.ValidateCode validateCode = new Common.ValidateCode();
      string code = validateCode.CreateValidateCode(4); //生成的驗證碼4個長度
      Session["validateCode"] = code;
      byte[] buffer = validateCode.CreateValidateGraphic(code);//創(chuàng)建驗證碼圖片
      return File(buffer, "image/jpeg");//返回圖片
    }

到Login視圖里面的index頁面去把img的src補充為：

 <tr>
   <td style="width:20px"></td>
    <td><img id="image" src="/Login/ValidateCode/?id=1" style="float: left; height: 24px;" /></td>
    <td><a href="javascript:void(0)" onclick="changeCheckCode();return false;">看不清，換一張</a></td>
</tr>

就可以看到頁面上面顯示出來驗證碼

下面要做的就是點擊切換驗證碼，這是通過js實現(xiàn)的代碼

 <script type="text/javascript">
    $(function () {
      
      initWin(); //初始化登錄窗體
      changeCheckCode(); //切換驗證碼
    });
    function initWin() {
      $("#win").window({
        title: "登錄",
        width: 400,
        height: 270,
        collapsible: false,
        minimizable: false,
        maximizable: false,
        closable: false,
        modal: true,
        resizable: false,
      });
      
    }
    //切換驗證碼
    function changeCheckCode() {
      $("#changeVcode").click(function () {
        $("#image").attr("src", $("#image").attr("src") + 1);
      });
    }
  </script>

以上就是本文的全部內(nèi)容，希望對大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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