务必收藏备用:.net core中通过Json或直接获取图形验证码(数字验证码、字母验证码、混合验证码),有源代码全实战demo(开源代码.net core3.0)

  • 2019 年 11 月 6 日
  • 筆記

很多人写的博客大家看了会一知半解,不知道怎么用,应该引用什么类库或者代码不全,这样很多小白很是头疼,尤其是尝新技术更是如此。我们这边不止告诉你步骤,而且还提供开源demo。随着时间的推移,我们的demo库会日益强大请及时收藏GitHub

1.首先你需要Nuget引用类库

Install-Package ZKWeb.System.Drawing -Version 4.0.1

2.创建公共类VerifyCodeHelper和CommonHelper

 

 

 (1)CommonHelper中添加图形处理方法

#region 验证码          public static byte[] Bitmap2Byte(Bitmap bitmap)          {              using (MemoryStream stream = new MemoryStream())              {                  bitmap.Save(stream, ImageFormat.Jpeg);                  byte[] data = new byte[stream.Length];                  stream.Seek(0, SeekOrigin.Begin);                  stream.Read(data, 0, Convert.ToInt32(stream.Length));                  return data;              }          }          #endregion

(2)VerifyCodeHelper添加图形处理方法

public  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"></param>          /// <param name="height"></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"></param>          /// <param name="height"></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

3.后台控制器根据请求返回相应图形数据

 #region 验证码            #region 混合验证码            [HttpGet]          public string MixVerifyCodeJson()          {              string code = VerifyCodeHelper.GetSingleObj().CreateVerifyCode(VerifyCodeHelper.VerifyCodeType.MixVerifyCode);              var bitmap = VerifyCodeHelper.GetSingleObj().CreateBitmapByImgVerifyCode(code, 100, 40);              byte[] imgBt = CommonHelper.Bitmap2Byte(bitmap);              string uuid = Guid.NewGuid().ToString();              return CommonHelper.CodeJson(uuid, Convert.ToBase64String(imgBt));          }          [HttpGet]          public IActionResult 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.Png);              return File(stream.ToArray(), "image/png");          }          #endregion            #region 数字验证码          [HttpGet]          public string NumberVerifyCodeJson()          {              string code = VerifyCodeHelper.GetSingleObj().CreateVerifyCode(VerifyCodeHelper.VerifyCodeType.NumberVerifyCode);              var bitmap = VerifyCodeHelper.GetSingleObj().CreateBitmapByImgVerifyCode(code, 100, 40);              byte[] imgBt = CommonHelper.Bitmap2Byte(bitmap);              string uuid = Guid.NewGuid().ToString();              return CommonHelper.CodeJson(uuid, Convert.ToBase64String(imgBt));          }          [HttpGet]          public IActionResult NumberVerifyCode()          {              string code = VerifyCodeHelper.GetSingleObj().CreateVerifyCode(VerifyCodeHelper.VerifyCodeType.NumberVerifyCode);              var bitmap = VerifyCodeHelper.GetSingleObj().CreateBitmapByImgVerifyCode(code, 100, 40);              MemoryStream stream = new MemoryStream();              bitmap.Save(stream, ImageFormat.Png);              return File(stream.ToArray(), "image/png");          }          #endregion            #region 字母验证码          [HttpGet]          public IActionResult 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");          }          [HttpGet]          public string AbcVerifyCodeJson()          {              string code = VerifyCodeHelper.GetSingleObj().CreateVerifyCode(VerifyCodeHelper.VerifyCodeType.AbcVerifyCode);              var bitmap = VerifyCodeHelper.GetSingleObj().CreateBitmapByImgVerifyCode(code, 100, 40);              byte[] imgBt = CommonHelper.Bitmap2Byte(bitmap);              string uuid = Guid.NewGuid().ToString();              return CommonHelper.CodeJson(uuid, Convert.ToBase64String(imgBt));          }          #endregion            #endregion

4.前端请求分为直接请求文件或json图形数据并渲染至Img标签

<script type="text/javascript">      $(function () {          refreshNumJson();          refreshMixJson();          refreshAbcJson();      });      function refreshNum() {          var id = document.getElementById("numImg");          var str = "/Verify/NumberVerifyCode?random=" + Math.random();          id.setAttribute("src", str);      }      function refreshNumJson() {          $.ajax({              type: "get",              contentType: 'application/json',              url: '/Verify/NumberVerifyCodeJson?' + Math.random(),              dataType: 'json',              async: false,              success: function (data) {                  $("#numImgJson").attr("src", "data:image/png;base64," + data.msg);                  console.log(data.code);              },              error: function (xhr) {                  console.log(xhr.responseText);              }          });      }        function refreshMix() {          var id = document.getElementById("mixImg");          var str = "/Verify/MixVerifyCode?random=" + Math.random();          id.setAttribute("src", str);      }      function refreshMixJson() {          $.ajax({              type: "get",              contentType: 'application/json',              url: '/Verify/MixVerifyCodeJson?' + Math.random(),              dataType: 'json',              async: false,              success: function (data) {                  $("#mixImgJson").attr("src", "data:image/png;base64," + data.msg);                  console.log(data.code);              },              error: function (xhr) {                  console.log(xhr.responseText);              }          });      }        function refreshAbc() {          var id = document.getElementById("abcImg");          var str = "/Verify/AbcVerifyCode?random=" + Math.random();          id.setAttribute("src", str);      }      function refreshAbcJson() {          $.ajax({              type: "get",              contentType: 'application/json',              url: '/Verify/AbcVerifyCodeJson?' + Math.random(),              dataType: 'json',              async: false,              success: function (data) {                  $("#abcImgJson").attr("src", "data:image/png;base64," + data.msg);                  console.log(data.code);              },              error: function (xhr) {                  console.log(xhr.responseText);              }          });      }  </script>      <h2>图形数字验证码</h2>  <img id="numImgJson" title="数字验证码Json获取"       alt="vcode" style="cursor:pointer;" onclick="refreshNumJson()" />  <a href="javascript:void(0);" onclick="refreshNumJson()">看不清,换一张</a>  <img id="numImg" title="数字验证码" src="/Verify/NumberVerifyCode?random=1994"       alt="vcode" style="cursor:pointer;" onclick="refreshNum()" />  <a href="javascript:void(0);" onclick="refreshNum()">看不清,换一张</a>  <h2>图形字母验证码</h2>  <img id="abcImgJson" title="图形字母验证码Json获取"       alt="vcode" style="cursor:pointer;" onclick="refreshAbcJson()" />  <a href="javascript:void(0);" onclick="refreshAbcJson()">看不清,换一张</a>  <img id="abcImg" title="图形字母验证码" src="/Verify/AbcVerifyCode?random=1994"       alt="vcode" style="cursor:pointer;" onclick="refreshAbc()" />  <a href="javascript:void(0);" onclick="refreshAbc()">看不清,换一张</a>  <h2>图形混合验证码</h2>  <img id="mixImgJson" title="图形混合验证码Json获取"       alt="vcode" style="cursor:pointer;" onclick="refreshMixJson()" />  <a href="javascript:void(0);" onclick="refreshMixJson()">看不清,换一张</a>  <img id="mixImg" title="图形混合验证码" src="/Verify/MixVerifyCode?random=1994"       alt="vcode" style="cursor:pointer;" onclick="refreshMix()" />  <a href="javascript:void(0);" onclick="refreshMix()">看不清,换一张</a>

5.效果如图

 

 开源地址 动动小手,点个推荐吧!

注意:我们机遇屋该项目将长期为大家提供asp.net core各种好用demo,旨在帮助.net开发者提升竞争力和开发速度,建议尽早收藏该模板集合项目