NET7下显示验证码

NET7下显示验证码

nuget:Zkweb.system.drawing

mac 下显示验证码还得 nuget:runtime.osx.10.10-x64.CoreCompat.System.Drawing

 

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95

public  class VierificationCodeServices  {        /// <summary>       /// 该方法用于生成指定位数的随机数       /// </summary>       /// <param name="VcodeNum">参数是随机数的位数</param>       /// <returns>返回一个随机数字符串</returns>       public  string RndNum(int VcodeNum)      {          //验证码可以显示的字符集合           string Vchar = "0,1,2,3,4,5,6,7,8,9,a,b,c,d,e,f,g,h,i,j,k,l,m,n,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,P,P,Q" +              ",R,S,T,U,V,W,X,Y,Z";          string[] VcArray = Vchar.Split(new Char[] { ',' });//拆分成数组            string code = "";//产生的随机数           int temp = -1;//记录上次随机数值，尽量避避免生产几个一样的随机数             Random rand = new Random();          //采用一个简单的算法以保证生成随机数的不同           for (int i = 1; i < VcodeNum + 1; i++)          {              if (temp != -1)              {                  rand = new Random(i * temp * unchecked((int)DateTime.Now.Ticks));//初始化随机类               }              int t = rand.Next(61);//获取随机数               if (temp != -1 && temp == t)              {                  return RndNum(VcodeNum);//如果获取的随机数重复，则递归调用               }              temp = t;//把本次产生的随机数记录起来               code += VcArray[t];//随机数的位数加一           }          return code;      }        /// <summary>       /// 该方法是将生成的随机数写入图像文件  nuget:Zkweb.system.drawing      /// mac 下显示验证码还得 nuget:runtime.osx.10.10-x64.CoreCompat.System.Drawing      /// </summary>       /// <param name="code">code是一个随机数</param>      /// <param name="numbers">生成位数（默认4位）</param>       public MemoryStream CreateYZM(out string code, int numbers = 4)      {          code = RndNum(numbers);          Bitmap Img = null;          Graphics g = null;          MemoryStream ms = null;          Random random = new Random();          //验证码颜色集合           Color[] c = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };            //验证码字体集合          string[] fonts = { "Verdana", "Microsoft Sans Serif", "Comic Sans MS", "Arial", "宋体" };              //定义图像的大小，生成图像的实例           Img = new Bitmap((int)code.Length * 18, 32);            g = Graphics.FromImage(Img);//从Img对象生成新的Graphics对象               g.Clear(Color.White);//背景设为白色             //在随机位置画背景点           for (int i = 0; i < 100; i++)          {              int x = random.Next(Img.Width);              int y = random.Next(Img.Height);              g.DrawRectangle(new Pen(Color.LightGray, 0), x, y, 1, 1);          }          //验证码绘制在g中           for (int i = 0; i < code.Length; i++)          {              int cindex = random.Next(7);//随机颜色索引值               int findex = random.Next(5);//随机字体索引值               Font f = new Font(fonts[findex], 15, FontStyle.Bold);//字体               Brush b = new SolidBrush(c[cindex]);//颜色               int ii = 4;              if ((i + 1) % 2 == 0)//控制验证码不在同一高度               {                  ii = 2;              }              g.DrawString(code.Substring(i, 1), f, b, 3 + (i * 12), ii);//绘制一个验证字符           }          ms = new MemoryStream();//生成内存流对象           Img.Save(ms, ImageFormat.Jpeg);//将此图像以Png图像文件的格式保存到流中             //回收资源           g.Dispose();          Img.Dispose();          return ms;      }    }

　　

前台使用：

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

//注入  builder.Services.AddSingleton<Util.VierificationCodeServices>(new Util.VierificationCodeServices());     //html使用  <img id="imgcode" src="/Home2/Genyzm" onclick="changecode()" />     //控制器后端代码，需要用到session，记得nuget包，不过好像NET7中把那个NUGET包废弃了，但还能用   /// <summary>         /// 图形验证码         /// </summary>         /// <returns></returns>         public IActionResult GenYZM([FromServices] VierificationCodeServices _vierificationCodeServices)         {             string code = "";             System.IO.MemoryStream ms = _vierificationCodeServices.CreateYZM(out code);             HttpContext.Session.SetString("Code", code);             Response.Body.Dispose();             return File(ms.ToArray(), @"image/png");         }