富贵资源网

.NET Core 2.0如何生成图片验证码完整实例
站长资源 2024/11/18 佚名
26 1538
富贵资源网 Design By www.hznty.com

前言

图片验证码在我们日常开发中是必不可少会遇见的一个功能，最近工作中就遇到了这个需求，所以下面将实现的方法分享给大家，话不多说了，来一起看看详细的介绍吧。

.NET Core 2.0生成图片验证码

NuGet包引入：ZKWeb.System.Drawing，如下所示：

.NET Core 2.0如何生成图片验证码完整实例

代码实例如下：VerifyCodeHelper

using System;
using System.DrawingCore;
using System.DrawingCore.Drawing2D;
using System.DrawingCore.Imaging;
using System.IO;
 
namespace Common.Helper
{
 public sealed class VerifyCodeHelper
 {
  #region 单例模式
  //创建私有化静态obj锁 
  private static readonly object _ObjLock = new object();
  //创建私有静态字段，接收类的实例化对象 
  private static VerifyCodeHelper _VerifyCodeHelper = null;
  //构造函数私有化 
  private VerifyCodeHelper() { }
  //创建单利对象资源并返回 
  public static VerifyCodeHelper GetSingleObj()
  {
   if (_VerifyCodeHelper == null)
   {
    lock (_ObjLock)
    {
     if (_VerifyCodeHelper == null)
      _VerifyCodeHelper = new VerifyCodeHelper();
    }
   }
   return _VerifyCodeHelper;
  }
  #endregion
 
  #region 生产验证码
  public enum VerifyCodeType { NumberVerifyCode, AbcVerifyCode, MixVerifyCode };
 
  /// <summary>
  /// 1.数字验证码
  /// </summary>
  /// <param name="length"></param>
  /// <returns></returns>
  private string CreateNumberVerifyCode(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 = 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;
  }
 
  /// <summary>
  /// 2.字母验证码
  /// </summary>
  /// <param name="length">字符长度</param>
  /// <returns>验证码字符</returns>
  private string CreateAbcVerifyCode(int length)
  {
   char[] verification = new char[length];
   char[] dictionary = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
    'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'
   };
   Random random = new Random();
   for (int i = 0; i < length; i++)
   {
    verification[i] = dictionary[random.Next(dictionary.Length - 1)];
   }
   return new string(verification);
  }
 
  /// <summary>
  /// 3.混合验证码
  /// </summary>
  /// <param name="length">字符长度</param>
  /// <returns>验证码字符</returns>
  private string CreateMixVerifyCode(int length)
  {
   char[] verification = new char[length];
   char[] dictionary = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
    '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
    'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'
   };
   Random random = new Random();
   for (int i = 0; i < length; i++)
   {
    verification[i] = dictionary[random.Next(dictionary.Length - 1)];
   }
   return new string(verification);
  }
 
  /// <summary>
  /// 产生验证码（随机产生4-6位）
  /// </summary>
  /// <param name="type">验证码类型：数字，字符，符合</param>
  /// <returns></returns>
  public string CreateVerifyCode(VerifyCodeType type)
  {
   string verifyCode = string.Empty;
   Random random = new Random();
   int length = random.Next(4, 6);
   switch (type)
   {
    case VerifyCodeType.NumberVerifyCode:
     verifyCode = GetSingleObj().CreateNumberVerifyCode(length);
     break;
    case VerifyCodeType.AbcVerifyCode:
     verifyCode = GetSingleObj().CreateAbcVerifyCode(length);
     break;
    case VerifyCodeType.MixVerifyCode:
     verifyCode = GetSingleObj().CreateMixVerifyCode(length);
     break;
   }
   return verifyCode;
  }
  #endregion
 
  #region 验证码图片
  /// <summary>
  /// 验证码图片 => Bitmap
  /// </summary>
  /// <param name="verifyCode">验证码</param>
  /// <param name="width">宽</param>
  /// <param name="height">高</param>
  /// <returns>Bitmap</returns>
  public Bitmap CreateBitmapByImgVerifyCode(string verifyCode, int width, int height)
  {
   Font font = new Font("Arial", 14, (FontStyle.Bold | FontStyle.Italic));
   Brush brush;
   Bitmap bitmap = new Bitmap(width, height);
   Graphics g = Graphics.FromImage(bitmap);
   SizeF totalSizeF = g.MeasureString(verifyCode, font);
   SizeF curCharSizeF;
   PointF startPointF = new PointF(0, (height - totalSizeF.Height) / 2);
   Random random = new Random(); //随机数产生器
   g.Clear(Color.White); //清空图片背景色 
   for (int i = 0; i < verifyCode.Length; i++)
   {
    brush = new LinearGradientBrush(new Point(0, 0), new Point(1, 1), Color.FromArgb(random.Next(255), random.Next(255), random.Next(255)), Color.FromArgb(random.Next(255), random.Next(255), random.Next(255)));
    g.DrawString(verifyCode[i].ToString(), font, brush, startPointF);
    curCharSizeF = g.MeasureString(verifyCode[i].ToString(), font);
    startPointF.X += curCharSizeF.Width;
   }
 
   //画图片的干扰线 
   for (int i = 0; i < 10; i++)
   {
    int x1 = random.Next(bitmap.Width);
    int x2 = random.Next(bitmap.Width);
    int y1 = random.Next(bitmap.Height);
    int y2 = random.Next(bitmap.Height);
    g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
   }
 
   //画图片的前景干扰点 
   for (int i = 0; i < 100; i++)
   {
    int x = random.Next(bitmap.Width);
    int y = random.Next(bitmap.Height);
    bitmap.SetPixel(x, y, Color.FromArgb(random.Next()));
   }
 
   g.DrawRectangle(new Pen(Color.Silver), 0, 0, bitmap.Width - 1, bitmap.Height - 1); //画图片的边框线 
   g.Dispose();
   return bitmap;
  }
 
  /// <summary>
  /// 验证码图片 => byte[]
  /// </summary>
  /// <param name="verifyCode">验证码</param>
  /// <param name="width">宽</param>
  /// <param name="height">高</param>
  /// <returns>byte[]</returns>
  public byte[] CreateByteByImgVerifyCode(string verifyCode, int width, int height)
  {
   Font font = new Font("Arial", 14, (FontStyle.Bold | FontStyle.Italic));
   Brush brush;
   Bitmap bitmap = new Bitmap(width, height);
   Graphics g = Graphics.FromImage(bitmap);
   SizeF totalSizeF = g.MeasureString(verifyCode, font);
   SizeF curCharSizeF;
   PointF startPointF = new PointF(0, (height - totalSizeF.Height) / 2);
   Random random = new Random(); //随机数产生器
   g.Clear(Color.White); //清空图片背景色 
   for (int i = 0; i < verifyCode.Length; i++)
   {
    brush = new LinearGradientBrush(new Point(0, 0), new Point(1, 1), Color.FromArgb(random.Next(255), random.Next(255), random.Next(255)), Color.FromArgb(random.Next(255), random.Next(255), random.Next(255)));
    g.DrawString(verifyCode[i].ToString(), font, brush, startPointF);
    curCharSizeF = g.MeasureString(verifyCode[i].ToString(), font);
    startPointF.X += curCharSizeF.Width;
   }
 
   //画图片的干扰线 
   for (int i = 0; i < 10; i++)
   {
    int x1 = random.Next(bitmap.Width);
    int x2 = random.Next(bitmap.Width);
    int y1 = random.Next(bitmap.Height);
    int y2 = random.Next(bitmap.Height);
    g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
   }
 
   //画图片的前景干扰点 
   for (int i = 0; i < 100; i++)
   {
    int x = random.Next(bitmap.Width);
    int y = random.Next(bitmap.Height);
    bitmap.SetPixel(x, y, Color.FromArgb(random.Next()));
   }
 
   g.DrawRectangle(new Pen(Color.Silver), 0, 0, bitmap.Width - 1, bitmap.Height - 1); //画图片的边框线 
   g.Dispose();
 
   //保存图片数据 
   MemoryStream stream = new MemoryStream();
   bitmap.Save(stream, ImageFormat.Jpeg);
   //输出图片流 
   return stream.ToArray();
 
  }
  #endregion
 }
}

新建控制器：VerifyCodeController，

using System.DrawingCore.Imaging;
using System.IO;
using Common.Helper;
using Microsoft.AspNetCore.Mvc;
 
namespace WebApplicationApi.Controllers
{
 public class VerifyCodeController : Controller
 {
  public IActionResult Index()
  {
   return View();
  }
 
  /// <summary>
  /// 数字验证码
  /// </summary>
  /// <returns></returns>
  public FileContentResult NumberVerifyCode()
  {
   string code = VerifyCodeHelper.GetSingleObj().CreateVerifyCode(VerifyCodeHelper.VerifyCodeType.NumberVerifyCode);
   byte[] codeImage = VerifyCodeHelper.GetSingleObj().CreateByteByImgVerifyCode(code, 100, 40);
   return File(codeImage, @"image/jpeg");
  }
 
  /// <summary>
  /// 字母验证码
  /// </summary>
  /// <returns></returns>
  public FileContentResult AbcVerifyCode()
  {
   string code = VerifyCodeHelper.GetSingleObj().CreateVerifyCode(VerifyCodeHelper.VerifyCodeType.AbcVerifyCode);
   var bitmap = VerifyCodeHelper.GetSingleObj().CreateBitmapByImgVerifyCode(code, 100, 40);
   MemoryStream stream = new MemoryStream();
   bitmap.Save(stream, ImageFormat.Png);
   return File(stream.ToArray(), "image/png");
  }
 
  /// <summary>
  /// 混合验证码
  /// </summary>
  /// <returns></returns>
  public FileContentResult MixVerifyCode()
  {
   string code = VerifyCodeHelper.GetSingleObj().CreateVerifyCode(VerifyCodeHelper.VerifyCodeType.MixVerifyCode);
   var bitmap = VerifyCodeHelper.GetSingleObj().CreateBitmapByImgVerifyCode(code, 100, 40);
   MemoryStream stream = new MemoryStream();
   bitmap.Save(stream, ImageFormat.Gif);
   return File(stream.ToArray(), "image/gif");
  }
 
 }
}

添加页面index.cshtml，如下代码：

@{
 Layout = null;
}
<!DOCTYPE html>
<html>
<head>
 <meta name="viewport" content="width=device-width" />
 <title>Index</title>
</head>
<body>
 <figure>
  <h3>图片验证码</h3>
  <fieldset>
   <legend>数字验证码</legend>
   <img id="nubImg" title="数字验证码" src="/UploadFiles/2021-04-02/NumberVerifyCode">


生成验证码如下所示：


.NET Core 2.0如何生成图片验证码完整实例


总结


以上就是这篇文章的全部内容了，希望本文的内容对大家的学习或者工作具有一定的参考学习价值，如果有疑问大家可以留言交流，谢谢大家对的支持。
富贵资源网 Design By www.hznty.com
广告合作：本站广告合作请联系QQ：858582 申请时备注：广告合作（否则不回）
免责声明：本站资源来自互联网收集,仅供用于学习和交流,请遵循相关法律法规,本站一切资源不代表本站立场,如有侵权、后门、不妥请联系本站删除！
富贵资源网 Design By www.hznty.com
www.hznty.com 富贵资源网
20,135影音资源
44,641技术资源
2,817软件资源
435,032站长资源

友情链接

杰晶网络 DDR爱好者之家 桃源资源网 杰网资源 富贵资源网 南强小屋 铁雪资源网 幽灵资源网 万梅资源网 狼山资源网 白云岛资源网 昆仑资源网 相思资源网 明霞山资源网 内蒙古资源网 黑松山资源网 茶园资源网 饿虎岗资源网 大旗谷资源网 常春岛资源网 岱庙资源网 兴国资源网 快活林资源网 蝙蝠岛资源网 帝王谷资源网 白云城资源网 伏龙阁资源网 清风细雨楼 天枫庄资源网 圆月山庄资源网 无争山庄资源网 神水资源网 移花宫资源网 神剑山庄资源网 无为清净楼资源网 金钱帮资源网 丐帮资源网 华山资源网 极乐门资源网 小李飞刀资源网 凤求凰客栈 风云阁资源网 金狮镖局 鸳鸯亭资源网 千金楼资源网 更多链接
富贵资源网 Design By www.hznty.com