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.net core webapi+vue实现登录图片验证码功能

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生成图像文件类(添加NuGet包:ZKWeb.System.Drawing)
using System; using System.DrawingCore; using System.DrawingCore.Imaging; using System.IO;   namespace Security {     public static 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>          private static 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          /// </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 static MemoryStream Create(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;         }     }   }


controller(添加NuGet包:Microsoft.AspNetCore.Session)(谷歌浏览器跨域需要设置用户客户端,不建议使用session存储方案)

using System.Threading.Tasks; using Microsoft.AspNetCore.Http; using Microsoft.AspNetCore.Mvc; using Microsoft.AspNetCore.Cors; using Security;   namespace Back {     [Route("back/[controller]/[action]"), EnableCors("AllowAnyOrigin")]     public class LoginController : Controller     {         /// <summary>         /// 后台登入系统         /// </summary>         [HttpGet]         public async Task<IActionResult> Login(string pPhone, string pPassword, string code)         {             string loginValidateCode = HttpContext.Session.GetString("LoginValidateCode");             if (string.IsNullOrEmpty(code))             {                 return BadRequest("请填写验证码");             }             if (code.ToLower() != loginValidateCode.ToLower())             {                 return BadRequest("验证码错误");             }             return Ok();         }           /// <summary>         /// 图形验证码         /// </summary>         [HttpGet]         public IActionResult ValidateCode()         {             string code = "";             System.IO.MemoryStream ms = VierificationCodeServices.Create(out code);             HttpContext.Session.SetString("LoginValidateCode", code);             return File(ms.ToArray(), @"image/png");         }       } }


Startup

// This method gets called by the runtime. Use this method to add services to the container. public void ConfigureServices(IServiceCollection services) {     services.AddMvc();       //添加session     services.AddSession();     //添加跨域访问     services.AddCors(options =>     options.AddPolicy("AllowAnyOrigin",         builder => builder.WithOrigins("*").AllowAnyMethod().AllowAnyHeader().AllowAnyOrigin().AllowCredentials()));   }   // This method gets called by the runtime. Use this method to configure the HTTP request pipeline. public void Configure(IApplicationBuilder app, IHostingEnvironment env) {     if (env.IsDevelopment())     {         app.UseDeveloperExceptionPage();     }       //使用Session,必须在UseMvc之上     app.UseSession();     app.UseMvc();     //使用静态文件     app.UseStaticFiles(); }


vue

<img :src="codeUrl+'/Login/ValidateCode'" alt="看不清?点击更换" onclick="this.src = this.src + '?'" />   //axios配置 //webapi和vue不同域,由于同源策略,需配置以下代码 axios.defaults.withCredentials=true;
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