『验证码生成』在Linux中实现基于.Net Core生成验证码的代码封装

📣读完这篇文章里你能收获到

• .Net跨平台在Linux中及Windows中都可生成验证码
• 两套已验证过的实现方案代码封装，即Copy即用
• 快速在Centos 7.x中安装Linux字体

文章目录

• 一、安装Linux字体
• • 1. 查看字体库
  • 2. 运行安装字体库
  • 3. 安装ttmkfdir
  • 4. 查看字体库是否已安装成功
• 二、Docker环境
• 三、.NET 代码实现封装
• • 1. SixLabors.ImageSharp方案
  • • 1.1 效果
    • 1.2 源码链接
    • 1.3 Nuget依赖
    • 1.4 Helper代码封装
  • 2. SkiaSharp方案
  • • 2.1 效果
    • 2.2 源码链接
    • 2.3 Nuget依赖
    • 2.4 Helper代码封装

一、安装Linux字体

我以Centos 7.x为例，其他系统自行百度：xx系统安装字体

1. 查看字体库

如果没数据的话就继续往下走，先把字体库安装好
如果有数据的话，则跳过，直接进入第二点使用代码

fc-list

2. 运行安装字体库

yum -y install fontconfig

3. 安装ttmkfdir

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

4. 查看字体库是否已安装成功

fc-list

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>"]

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

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

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());}}
}

2. SkiaSharp方案

2.1 效果

2.2 源码链接

https://github.com/mono/SkiaSharp

2.3 Nuget依赖

<PackageReference Include="SkiaSharp" Version="2.88.3" />
<PackageReference Include="SkiaSharp.NativeAssets.Linux.NoDependencies" Version="2.88.3" />

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);image2d_x = width;image2d_y = height;}using (SKBitmap image2d = new SKBitmap(image2d_x, image2d_y, SKColorType.Bgra8888, SKAlphaType.Premul)){using (SKCanvas canvas = new SKCanvas(image2d)){canvas.DrawColor(SKColors.Black); // Clearusing (SKPaint drawStyle = CreatePaint(fontSize)){canvas.DrawText(code, 0 + 5, image2d_y - 5 - compensateDeepCharacters, drawStyle);}using (SKImage img = SKImage.FromBitmap(image2d)){using (SKData p = img.Encode(SKEncodedImageFormat.Png, 100)){imageBytes = p.ToArray();}}}return (code,imageBytes);}}private static SKPaint CreatePaint(int fontSize){string font = @"";font = @"Arial";font = @"Liberation Serif";font = @"Segoe Script";font = @"Consolas";font = @"Comic Sans MS";font = @"SimSun";font = @"Impact";return CreatePaint(SKColors.White, font, fontSize, SKTypefaceStyle.Normal);}private static SKPaint CreatePaint(SKColor color, string fontName, float fontSize, SKTypefaceStyle fontStyle){SKTypeface font = SKTypeface.FromFamilyName(fontName, fontStyle);SKPaint paint = new SKPaint();paint.IsAntialias = true;paint.Color = color;// paint.StrokeCap = SKStrokeCap.Round;paint.Typeface = font;paint.TextSize = fontSize;return paint;}// MeasureText("Impact", 12, SKTypefaceStyle.Bold);internal static SKRect MeasureText(string text, SKPaint paint){SKRect rect = new SKRect();paint.MeasureText(text, ref rect);return rect;} // End Function MeasureText }
}

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