『验证码生成』在Linux中实现基于_sixlabors.imagesharp 使用 linux 验证码

用来搜索目录中所有的字体信息，并汇总生成fonts.scale文件

yum -y install ttmkfdir

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4. 查看字体库是否已安装成功

fc-list

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二、Docker环境

FROM microsoft/dotnet:2.2.0-aspnetcore-runtime
WORKDIR /app
COPY . .
RUN apt-get update -y && apt-get install -y libgdiplus && apt-get clean && ln -s /usr/lib/libgdiplus.so /usr/lib/gdiplus.dll
EXPOSE 80
ENTRYPOINT ["dotnet", "<你的入口程序集>"]

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三、.NET 代码实现封装

1. SixLabors.ImageSharp方案

1.1 效果

1.2 源码链接

https://github.com/SixLabors/ImageSharp

1.3 Nuget依赖

<!--Nuget依赖-->
<PackageReference Include="SixLabors.ImageSharp" Version="2.1.3" />
<PackageReference Include="SixLabors.ImageSharp.Drawing" Version="1.0.0-beta15" />

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1.4 Helper代码封装

using SixLabors.ImageSharp;
using SixLabors.Fonts;
using SixLabors.ImageSharp.PixelFormats;
using SixLabors.ImageSharp.Processing;
using SixLabors.ImageSharp.Drawing.Processing;
using System;
using System.Linq;

namespace VertifyCode
{
    public class VerifyCodeHelper
    {
        private static readonly Color[] Colors = { Color.Black, Color.Red, Color.Blue, Color.Green, Color.Orange, Color.Brown,
                                                  Color.Brown,Color.DarkBlue};
        private static readonly char[] Chars = { '2','3','4','5','6','8','9',
                                                'A','B','C','D','E','F','G','H','J','K', 'L','M','N','P','R','S','T','W','X','Y' };
        //private static readonly int Width = 90;
        //private static readonly int Height = 35;

        private static string GenCode(int num)
        {
            var code = string.Empty;
            var r = new Random();

            for (int i = 0; i < num; i++)
            {
                code += Chars[r.Next(Chars.Length)].ToString();
            }

            return code;
        }

        public static (string code, byte[] bytes) CreateValidateGraphic(int CodeLength, int Width = 80, int Height = 40, int FontSize = 14)
        {
            var code = GenCode(CodeLength);
            var r = new Random();
            using var image = new Image<Rgba32>(Width, Height);
            // 字体
            var font = SystemFonts.CreateFont(SystemFonts.Families.First().Name, FontSize, FontStyle.Bold);
            image.Mutate(ctx =>
                         {
                             // 白底背景
                             ctx.Fill(Color.White);

                             // 画验证码
                             for (int i = 0; i < code.Length; i++)
                {
                    ctx.DrawText(code[i].ToString()
                                 , font
                                 , Colors[r.Next(Colors.Length)]
                                 , new PointF(20 \* i + 10, r.Next(2, 12)));
                }

                             // 画干扰线
                             for (int i = 0; i < 6; i++)
                {
                    var pen = new Pen(Colors[r.Next(Colors.Length)], 1);
                    var p1 = new PointF(r.Next(Width), r.Next(Height));
                    var p2 = new PointF(r.Next(Width), r.Next(Height));

                    ctx.DrawLines(pen, p1, p2);
                }

                             // 画噪点
                             for (int i = 0; i < 60; i++)
                {
                    var pen = new Pen(Colors[r.Next(Colors.Length)], 1);
                    var p1 = new PointF(r.Next(Width), r.Next(Height));
                    var p2 = new PointF(p1.X + 1f, p1.Y + 1f);

                    ctx.DrawLines(pen, p1, p2);
                }
                         });
            using var ms = new System.IO.MemoryStream();

            // 格式 自定义
            image.SaveAsPng(ms);
            return (code, ms.ToArray());
        }
    }
}


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2. SkiaSharp方案

2.1 效果

2.2 源码链接

https://github.com/mono/SkiaSharp

2.3 Nuget依赖

<!--Nuget依赖-->
<PackageReference Include="SkiaSharp" Version="2.88.3" />
<PackageReference Include="SkiaSharp.NativeAssets.Linux.NoDependencies" Version="2.88.3" />

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2.4 Helper代码封装

using SkiaSharp;
using System;

namespace VertifyCode
{

    public class VerifyCodeImageSharpHelper
    {

        private static readonly char[] Chars = { '2','3','4','5','6','8','9',
       'A','B','C','D','E','F','G','H','J','K', 'L','M','N','P','R','S','T','W','X','Y' };

        private static string GenCode(int num)
        {
            var code = string.Empty;
            var r = new Random();

            for (int i = 0; i < num; i++)
            {
                code += Chars[r.Next(Chars.Length)].ToString();
            }

            return code;
        }

        public static (string code, byte[] bytes) CreateValidateGraphic(int codeLength, int width = 80, int height = 40, int fontSize = 20)
        {
            var code = GenCode(codeLength);

            byte[] imageBytes = null;
            int image2d_x = 0;
            int image2d_y = 0;
            SKRect size;
            int compensateDeepCharacters = 0;
            using (SKPaint drawStyle = CreatePaint(fontSize))
            {
                size = MeasureText(code, drawStyle);


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