linux下使用c#自带的获取验证码需要安装图形处理插件比较麻烦
安装nugit依赖
SkiaSharp.NativeAssets.Linux.NoDependencies
添加helper类
SkiaSharpValidateCodeHelper.cs
using SkiaSharp; using System.Text; namespace VerifyCode.Helpers { public class SkiaSharpValidateCodeHelper { private Random objRandom = new Random(); #region setting /// <summary> /// //验证码长度 /// </summary> public int SetLength { get; set; } = 4; /// <summary> /// 验证码字符串 /// </summary> public string SetVerifyCodeText { get; set; } /// <summary> /// 是否加入小写字母 /// </summary> public bool SetAddLowerLetter { get; set; } = true; /// <summary> /// 是否加入大写字母 /// </summary> public bool SetAddUpperLetter { get; set; } = true; /// <summary> /// 字体大小 /// </summary> public int SetFontSize = 36; /// <summary> /// //字体颜色 /// </summary> public SKColor SetFontColor { get; set; } = SKColors.Blue; /// <summary> /// 字体类型 /// </summary> public string SetFontFamily = "Verdana"; /// <summary> /// 背景色 /// </summary> public SKColor SetBackgroundColor { get; set; } = SKColors.AliceBlue; /// <summary> /// 是否加入背景线 /// </summary> public bool SetIsBackgroundLine { get; set; } /// <summary> /// 前景噪点数量 /// </summary> public int SetForeNoisePointCount { get; set; } = 2; /// <summary> /// 随机码的旋转角度 /// </summary> public int SetRandomAngle { get; set; } = 40; /// <summary> /// 是否随机字体颜色 /// </summary> public bool SetIsRandomColor { get; set; } = true; /// <summary> /// 图片宽度 /// </summary> public int SetWith { get; set; } = 200; /// <summary> /// 图片高度 /// </summary> public int SetHeight { get; set; } = 40; /// <summary> /// 问题验证码答案，适用于运算符 /// </summary> public string VerifyCodeResult { get; private set; } #endregion #region Constructor Method public SkiaSharpValidateCodeHelper(int length = 4, bool isOperation = false) { if (isOperation) { var dic = GetQuestion(); SetVerifyCodeText = dic.Key; VerifyCodeResult = dic.Value; SetRandomAngle = 0; } else { SetLength = length; GetVerifyCodeText(); } SetWith = SetVerifyCodeText.Length * SetFontSize; SetHeight = Convert.ToInt32((60.0 / 100) * SetFontSize + SetFontSize); InitColors(); } #endregion #region Private Method /// <summary> /// 得到验证码字符串 /// </summary> private void GetVerifyCodeText() { //没有外部输入验证码时随机生成 if (string.IsNullOrEmpty(SetVerifyCodeText)) { StringBuilder objStringBuilder = new StringBuilder(); //加入数字1-9 for (int i = 1; i <= 9; i++) { objStringBuilder.Append(i.ToString()); } //加入大写字母A-Z，不包括O if (SetAddUpperLetter) { char temp = ' '; for (int i = 0; i < 26; i++) { temp = Convert.ToChar(i + 65); //如果生成的字母不是'O' if (!temp.Equals('O')) { objStringBuilder.Append(temp); } } } //加入小写字母a-z，不包括o if (SetAddLowerLetter) { char temp = ' '; for (int i = 0; i < 26; i++) { temp = Convert.ToChar(i + 97); //如果生成的字母不是'o' if (!temp.Equals('o')) { objStringBuilder.Append(temp); } } } //生成验证码字符串 { int index = 0; for (int i = 0; i < SetLength; i++) { index = objRandom.Next(0, objStringBuilder.Length); SetVerifyCodeText += objStringBuilder[index]; objStringBuilder.Remove(index, 1); } } } } /// <summary> /// 获取随机颜色 /// </summary> /// <returns></returns> private SKColor GetRandomColor() { Random RandomNum_First = new Random((int)DateTime.Now.Ticks); // 对于C#的随机数，没什么好说的 System.Threading.Thread.Sleep(RandomNum_First.Next(50)); Random RandomNum_Sencond = new Random((int)DateTime.Now.Ticks); // 为了在白色背景上显示，尽量生成深色 int int_Red = RandomNum_First.Next(256); int int_Green = RandomNum_Sencond.Next(256); int int_Blue = (int_Red + int_Green > 400) ? 0 : 400 - int_Red - int_Green; int_Blue = (int_Blue > 255) ? 255 : int_Blue; return SKColor.FromHsv(int_Red, int_Green, int_Blue); } #endregion #region Public Method /// <summary> /// 获取问题 /// </summary> /// <param name="questionList">默认数字加减验证</param> /// <returns></returns> public KeyValuePair<string, string> GetQuestion(Dictionary<string, string> questionList = null) { if (questionList == null) { questionList = new Dictionary<string, string>(); var operArray = new string[] { "+", "*", "-", "/" }; var left = objRandom.Next(0, 10); var right = objRandom.Next(0, 10); var oper = operArray[objRandom.Next(0, operArray.Length)]; string key = string.Empty, val = string.Empty; switch (oper) { case "+": key = string.Format("{0}+{1}=?", left, right); val = (left + right).ToString(); questionList.Add(key, val); break; case "*": key = string.Format("{0}×{1}=?", left, right); val = (left * right).ToString(); questionList.Add(key, val); break; case "-": if (left < right) { var intTemp = left; left = right; right = intTemp; } questionList.Add(left + "-" + right + "= ?", (left - right).ToString()); break; case "/": right = objRandom.Next(1, 10); left = right * objRandom.Next(1, 10); questionList.Add(left + "÷" + right + "= ?", (left / right).ToString()); break; } } return questionList.ToList()[objRandom.Next(0, questionList.Count)]; } #endregion #region newCode /// <summary> /// 干扰线的颜色集合 /// </summary> private List<SKColor> colors { get; set; } public void InitColors() { colors = new List<SKColor>(); colors.Add(SKColors.AliceBlue); colors.Add(SKColors.PaleGreen); colors.Add(SKColors.PaleGoldenrod); colors.Add(SKColors.Orchid); colors.Add(SKColors.OrangeRed); colors.Add(SKColors.Orange); colors.Add(SKColors.OliveDrab); colors.Add(SKColors.Olive); colors.Add(SKColors.OldLace); colors.Add(SKColors.Navy); colors.Add(SKColors.NavajoWhite); colors.Add(SKColors.Moccasin); colors.Add(SKColors.MistyRose); colors.Add(SKColors.MintCream); colors.Add(SKColors.MidnightBlue); colors.Add(SKColors.MediumVioletRed); colors.Add(SKColors.MediumTurquoise); colors.Add(SKColors.MediumSpringGreen); colors.Add(SKColors.LightSlateGray); colors.Add(SKColors.LightSteelBlue); colors.Add(SKColors.LightYellow); colors.Add(SKColors.Lime); colors.Add(SKColors.LimeGreen); colors.Add(SKColors.Linen); colors.Add(SKColors.PaleTurquoise); colors.Add(SKColors.Magenta); colors.Add(SKColors.MediumAquamarine); colors.Add(SKColors.MediumBlue); colors.Add(SKColors.MediumOrchid); colors.Add(SKColors.MediumPurple); colors.Add(SKColors.MediumSeaGreen); colors.Add(SKColors.MediumSlateBlue); colors.Add(SKColors.Maroon); colors.Add(SKColors.PaleVioletRed); colors.Add(SKColors.PapayaWhip); colors.Add(SKColors.PeachPuff); colors.Add(SKColors.Snow); colors.Add(SKColors.SpringGreen); colors.Add(SKColors.SteelBlue); colors.Add(SKColors.Tan); colors.Add(SKColors.Teal); colors.Add(SKColors.Thistle); colors.Add(SKColors.SlateGray); colors.Add(SKColors.Tomato); colors.Add(SKColors.Violet); colors.Add(SKColors.Wheat); colors.Add(SKColors.White); colors.Add(SKColors.WhiteSmoke); colors.Add(SKColors.Yellow); colors.Add(SKColors.YellowGreen); colors.Add(SKColors.Turquoise); colors.Add(SKColors.LightSkyBlue); colors.Add(SKColors.SlateBlue); colors.Add(SKColors.Silver); colors.Add(SKColors.Peru); colors.Add(SKColors.Pink); colors.Add(SKColors.Plum); colors.Add(SKColors.PowderBlue); colors.Add(SKColors.Purple); colors.Add(SKColors.Red); colors.Add(SKColors.SkyBlue); colors.Add(SKColors.RosyBrown); colors.Add(SKColors.SaddleBrown); colors.Add(SKColors.Salmon); colors.Add(SKColors.SandyBrown); colors.Add(SKColors.SeaGreen); colors.Add(SKColors.SeaShell); colors.Add(SKColors.Sienna); colors.Add(SKColors.RoyalBlue); colors.Add(SKColors.LightSeaGreen); colors.Add(SKColors.LightSalmon); colors.Add(SKColors.LightPink); colors.Add(SKColors.Crimson); colors.Add(SKColors.Cyan); colors.Add(SKColors.DarkBlue); colors.Add(SKColors.DarkCyan); colors.Add(SKColors.DarkGoldenrod); colors.Add(SKColors.DarkGray); colors.Add(SKColors.Cornsilk); colors.Add(SKColors.DarkGreen); colors.Add(SKColors.DarkMagenta); colors.Add(SKColors.DarkOliveGreen); colors.Add(SKColors.DarkOrange); colors.Add(SKColors.DarkOrchid); colors.Add(SKColors.DarkRed); colors.Add(SKColors.DarkSalmon); colors.Add(SKColors.DarkKhaki); colors.Add(SKColors.DarkSeaGreen); colors.Add(SKColors.CornflowerBlue); colors.Add(SKColors.Chocolate); colors.Add(SKColors.AntiqueWhite); colors.Add(SKColors.Aqua); colors.Add(SKColors.Aquamarine); colors.Add(SKColors.Azure); colors.Add(SKColors.Beige); colors.Add(SKColors.Bisque); colors.Add(SKColors.Coral); colors.Add(SKColors.Black); colors.Add(SKColors.Blue); colors.Add(SKColors.BlueViolet); colors.Add(SKColors.Brown); colors.Add(SKColors.BurlyWood); colors.Add(SKColors.CadetBlue); colors.Add(SKColors.Chartreuse); colors.Add(SKColors.BlanchedAlmond); colors.Add(SKColors.Transparent); colors.Add(SKColors.DarkSlateBlue); colors.Add(SKColors.DarkTurquoise); colors.Add(SKColors.IndianRed); colors.Add(SKColors.Indigo); colors.Add(SKColors.Ivory); colors.Add(SKColors.Khaki); colors.Add(SKColors.Lavender); colors.Add(SKColors.LavenderBlush); colors.Add(SKColors.HotPink); colors.Add(SKColors.LawnGreen); colors.Add(SKColors.LightBlue); colors.Add(SKColors.LightCoral); colors.Add(SKColors.LightCyan); colors.Add(SKColors.LightGoldenrodYellow); colors.Add(SKColors.LightGray); colors.Add(SKColors.LightGreen); colors.Add(SKColors.LemonChiffon); colors.Add(SKColors.DarkSlateGray); colors.Add(SKColors.Honeydew); colors.Add(SKColors.Green); colors.Add(SKColors.DarkViolet); colors.Add(SKColors.DeepPink); colors.Add(SKColors.DeepSkyBlue); colors.Add(SKColors.DimGray); colors.Add(SKColors.DodgerBlue); colors.Add(SKColors.Firebrick); colors.Add(SKColors.GreenYellow); colors.Add(SKColors.FloralWhite); colors.Add(SKColors.Fuchsia); colors.Add(SKColors.Gainsboro); colors.Add(SKColors.GhostWhite); colors.Add(SKColors.Gold); colors.Add(SKColors.Goldenrod); colors.Add(SKColors.Gray); colors.Add(SKColors.ForestGreen); } /// <summary> /// 创建画笔 /// </summary> /// <param name="color"></param> /// <param name="fontSize"></param> /// <returns></returns> private SKPaint CreatePaint(SKColor color, float fontSize) { SkiaSharp.SKTypeface font = SKTypeface.FromFamilyName(null, SKFontStyleWeight.SemiBold, SKFontStyleWidth.ExtraCondensed, SKFontStyleSlant.Upright); SKPaint paint = new SKPaint(); paint.IsAntialias = true; paint.Color = color; paint.Typeface = font; paint.TextSize = fontSize; return paint; } /// <summary> /// 获取验证码 /// </summary> /// <param name="captchaText">验证码文字</param> /// <param name="width">图片宽度</param> /// <param name="height">图片高度</param> /// <param name="lineNum">干扰线数量</param> /// <param name="lineStrookeWidth">干扰线宽度</param> /// <returns></returns> public byte[] GetVerifyCodeImage(int lineNum = 1, int lineStrookeWidth = 1) { //创建bitmap位图 using (SKBitmap image2d = new SKBitmap(SetWith, SetHeight, SKColorType.Bgra8888, SKAlphaType.Premul)) { //创建画笔 using (SKCanvas canvas = new SKCanvas(image2d)) { //填充背景颜色为白色 if (SetIsRandomColor) { SetFontColor = GetRandomColor(); } //填充白色背景 canvas.Clear(SetBackgroundColor); AddForeNoisePoint(image2d); AddBackgroundNoisePoint(image2d, canvas); //canvas.DrawColor(SKColors.White); //将文字写到画布上 SKFont font = new SKFont(SKFontManager.Default.CreateTypeface(File.Open("simhei.ttf", FileMode.Open))); font.Size = 38; var drawStyle = new SKPaint(); drawStyle.IsAntialias = true; drawStyle.TextSize = SetFontSize; char[] chars = SetVerifyCodeText.ToCharArray(); for (int i = 0; i < chars.Length; i++) { //var font = SKTypeface.FromFamilyName(SetFontFamily, SKFontStyleWeight.SemiBold, SKFontStyleWidth.ExtraCondensed, SKFontStyleSlant.Upright); //转动的度数 float angle = objRandom.Next(-30, 30); canvas.Translate(12, 12); float px = ((i) * SetFontSize); float py = (SetHeight) / 2; canvas.RotateDegrees(angle, px, py); //drawStyle.Typeface = font; drawStyle.Color = SetFontColor; //写字 (i + 1) * 16, 28 canvas.DrawText(chars[i].ToString(), px, py, font, drawStyle); // canvas.DrawText(chars[i].ToString(), (i ) * SetFontSize, (SetHeight-1), drawStyle); canvas.RotateDegrees(-angle, px, py); canvas.Translate(-12, -12); } // using (SKPaint drawStyle = CreatePaint(SKColors.Black, SetHeight)) //{ // Console.WriteLine( drawStyle.TextSize ); // drawStyle.TextSize = SetFontSize; // canvas.DrawText(SetVerifyCodeText, 1, SetHeight-1, drawStyle); //} //画随机干扰线 using (SKPaint disturbStyle = new SKPaint()) { Random random = new Random(); for (int i = 0; i < lineNum; i++) { disturbStyle.Color = colors[random.Next(colors.Count)]; disturbStyle.StrokeWidth = lineStrookeWidth; canvas.DrawLine(random.Next(0, SetWith), random.Next(0, SetHeight), random.Next(0, SetWith), random.Next(0, SetHeight), disturbStyle); } } //返回图片byte using (SKImage img = SKImage.FromBitmap(image2d)) { using (SKData p = img.Encode(SKEncodedImageFormat.Png, 100)) { return p.ToArray(); } } } } } /// <summary> /// 获取验证码 /// </summary> /// <param name="captchaText">验证码文字</param> /// <param name="width">图片宽度</param> /// <param name="height">图片高度</param> /// <param name="lineNum">干扰线数量</param> /// <param name="lineStrookeWidth">干扰线宽度</param> /// <returns></returns> public string GetVerifyCodeImageBase64(int lineNum = 1, int lineStrookeWidth = 1) { return Convert.ToBase64String(GetVerifyCodeImage(lineNum, lineStrookeWidth)); } private void AddForeNoisePoint(SKBitmap objBitmap) { for (int i = 0; i < objBitmap.Width * SetForeNoisePointCount; i++) { objBitmap.SetPixel(objRandom.Next(objBitmap.Width), objRandom.Next(objBitmap.Height), SetFontColor); } } private void AddBackgroundNoisePoint(SKBitmap objBitmap, SKCanvas objGraphics) { using (SKPaint objPen = CreatePaint(SKColors.Azure, 0)) { for (int i = 0; i < objBitmap.Width * 2; i++) { objGraphics.DrawRect(objRandom.Next(objBitmap.Width), objRandom.Next(objBitmap.Height), 1, 1, objPen); } } if (SetIsBackgroundLine) { //画图片的背景噪音线 for (var i = 0; i < 12; i++) { var x1 = objRandom.Next(objBitmap.Width); var x2 = objRandom.Next(objBitmap.Width); var y1 = objRandom.Next(objBitmap.Height); var y2 = objRandom.Next(objBitmap.Height); objGraphics.DrawLine(x1, y1, x2, y2, CreatePaint(SKColors.Silver, 0)); } } } #endregion } }
将字体放入项目目录
需要什么字体自己从C:\Windows\Fonts中找
调用
[Route("t2"), HttpGet] public object T2() { //TODO:安装 SkiaSharp.NativeAssets.Linux.NoDependencies 包 var validateCodeProvider = new SkiaSharpValidateCodeHelper(); validateCodeProvider.SetWith = 90; validateCodeProvider.SetHeight = 40; validateCodeProvider.SetFontSize = 20; var img = validateCodeProvider.GetVerifyCodeImageBase64(); var text = validateCodeProvider.SetVerifyCodeText; return new { Base64 = $"data:image/jpeg;base64,{img}", Code = text }; }
效果
