Net Core教程
C#生成验证码
本文主要是介绍C#生成验证码，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！
public class VerificationCode
{
//产生验证码的字符集
private static string[] ValidateCharArray = new string[] { "2", "3", "4", "5", "6", "8", "9", "A", "B", "C", "D", "E", "F", "G", "H", "J", "K", "M", "N", "P", "R", "S", "U", "W", "X", "Y", "a", "b", "c", "d", "e", "f", "g", "h", "j", "k", "m", "n", "p", "r", "s", "u", "w", "x", "y" };
//产生验证码的算术符号
private static string[] ArithmeticSymbol = new string[] { "＋", "－", "×", "÷" };
//64位图片字符串开头描述
private const string imageStr = "data:image/{0};base64,";
///<summary>
///生成随机验证码（数字字母）
///</summary>
///<param name="length">验证码的长度</param>
///<returns></returns>
public static string CreateValidateNumber(int length)
{
string randomCode = "";
int temp = -1;
Random rand = new Random();
for (int i = 0; i < length; i++)
{
if (temp != -1)
{
rand = new Random(i * temp * ((int)DateTime.Now.Ticks));
}
int t = rand.Next(ValidateCharArray.Length);
if (temp != -1 && temp == t)
{
return CreateValidateNumber(length);
}
temp = t;
randomCode += ValidateCharArray[t];
}
return randomCode;
}
/// <summary>
/// 生成随机验证码（常用汉字）
/// </summary>
/// <param name="length">要产生常用汉字的个数</param>
/// <returns></returns>
public static string CreateValidateChinese(int length)
{
/*gb2312中文编码表由区码和位码表示*/
string randomCode = "";
Random rand = new Random();
Encoding encoding = Encoding.GetEncoding("gb2312");//从gb2312中文编码表提取汉字
for (int i = 0; i < length; i++)
{
int regionCode = rand.Next(16, 56); // 获取区码(常用汉字的区码范围为16-55)
int locationCode = rand.Next(1, (regionCode == 55 ? 90 : 95));// 获取位码(位码范围为1-94 由于55区的90,91,92,93,94为空,故将其排除)
randomCode += encoding.GetString(new byte[] { (byte)(regionCode + 160), (byte)(locationCode + 160) });//区码位码分别加上A0H（160）的方法转换为存储码
}
return randomCode;
}
///<summary>
///生成随机验证码（算术等式）
///</summary>
///<param name="length">验证码的长度</param>
///<returns></returns>
public static ArithmeticEquation CreateValidateArithmetic()
{
Random rand = new Random();
ArithmeticEquation ai = new ArithmeticEquation();
ai.text = new List<string>();
ai.text.Add("");
ai.text.Add("");
ai.text.Add("");
ai.text.Add("＝");
ai.text[1] = ArithmeticSymbol[rand.Next(0, 4)];
if (ai.text[1] == ArithmeticSymbol[0])//加
{
int len = rand.Next(1, 3);
if (len == 1)
{
ai.text[0] = rand.Next(0, 10).ToString();
}
else
{
ai.text[0] = rand.Next(1, 10).ToString();
ai.text[0] += rand.Next(0, 10).ToString();
}
if (len == 1)
{
ai.text[2] = rand.Next(1, 10).ToString();
ai.text[2] += rand.Next(0, 10).ToString();
}
else
{
ai.text[2] = rand.Next(0, 10).ToString();
}
}
else if (ai.text[1] == ArithmeticSymbol[1])//减
{
int len = rand.Next(1, 3);
if (len == 1)
{
ai.text[0] = rand.Next(0, 10).ToString();
}
else
{
ai.text[0] = rand.Next(1, 10).ToString();
ai.text[0] += rand.Next(0, 10).ToString();
}
if (len == 1)
{
ai.text[2] = rand.Next(0, int.Parse(ai.text[0]) + 1).ToString();
}
else
{
ai.text[2] = rand.Next(0, 10).ToString();
}
}
else if (ai.text[1] == ArithmeticSymbol[2])//乘
{
ai.text[0] = rand.Next(1, 10).ToString();
ai.text[2] = rand.Next(1, 10).ToString();
}
else
{
ai.text[2] = rand.Next(1, 10).ToString();
ai.text[0] = (int.Parse(ai.text[2]) * rand.Next(1, 10)).ToString();
}
ai.value = calculate(ai.text[1], int.Parse(ai.text[0]), int.Parse(ai.text[2])).ToString();
return ai;
}
///<summary>
///创建验证码的图片
///</summary>
///<param name="bitmapParam">验证码参数</param>
///<param name="isGif">Gif样式</param>
public static Bitmap CreateValidateImage(BitmapParam bitmapParam, BitmapStyle bitmapStyle)
{
Bitmap result = null;
Random random = new Random();
string text = String.Concat(bitmapParam.textarr);
int count = bitmapParam.textarr.Count;
Bitmap bmp_template = new Bitmap(bitmapParam.width, bitmapParam.height);
Graphics g_template = Graphics.FromImage(bmp_template);
#region 绘制干扰线
g_template.Clear(bitmapParam.backColor);
using (Pen pen = new Pen(Color.Silver))
{
for (int i = 0; i < 25; i++)
{
int x1 = random.Next(bmp_template.Width);
int x2 = random.Next(bmp_template.Width);
int y1 = random.Next(bmp_template.Height);
int y2 = random.Next(bmp_template.Height);
g_template.DrawLine(pen, x1, y1, x2, y2);
}
}
#endregion
List<Dot> dotlist = new List<Dot>();
#region 计算干扰点坐标
for (int i = 0; i < 100; i++)
{
dotlist.Add(new Dot() { gyd = new Point(random.Next(bmp_template.Width), random.Next(bmp_template.Height)), color = Color.FromArgb(random.Next()) });
}
#endregion
int defaultfontsize = 7;
int defaultfontmargin = 3;
#region 根据RECT计算文本字体大小
for (int i = defaultfontsize; i < 300; i++)
{
using (Font f = new Font(bitmapParam.fontName, i, bitmapParam.fontStyle))
{
if (g_template.MeasureString(text, f).Width > bitmapParam.width - defaultfontmargin * 2)
{
defaultfontsize = i;
break;
}
}
}
for (int i = defaultfontsize; i > 1; i--)
{
using (Font f = new Font(bitmapParam.fontName, i, bitmapParam.fontStyle))
{
if (g_template.MeasureString(text, f).Height < bitmapParam.height - defaultfontmargin * 2)
{
defaultfontsize = i;
break;
}
}
}
#endregion
Font text_font = new Font(bitmapParam.fontName, defaultfontsize, bitmapParam.fontStyle);
SizeF text_size = g_template.MeasureString(text, text_font);
LinearGradientBrush text_brush = new LinearGradientBrush(new Rectangle(0, 0, bmp_template.Width, bmp_template.Height), Color.FromArgb(193, 0, 91), Color.FromArgb(136, 193, 0), 1.2f, true);
float x_align = ((float)bitmapParam.width - text_size.Width) / 2.0f;
float y_align = ((float)bitmapParam.height - text_size.Height) / 2.0f;
List<BitmapFrame> bitmapframelist = new List<BitmapFrame>();
if (!bitmapStyle.IsGif || (bitmapStyle.IsGif && bitmapStyle.FrameType == GifFrameType.FullFrame))
{
bitmapframelist.Add(new BitmapFrame() { frame = (Bitmap)bmp_template.Clone() });
using (Graphics graphics = Graphics.FromImage(bitmapframelist[0].frame))
{
graphics.DrawString(text, text_font, text_brush, x_align, y_align);
foreach (Dot dot in dotlist)
{
bitmapframelist[0].frame.SetPixel(dot.gyd.X, dot.gyd.Y, dot.color);
}
}
if (!bitmapStyle.IsGif)
{
result = bitmapframelist[0].frame;
}
else
{
GifCore gif = new GifCore(bitmapStyle.Delay, bitmapStyle.Repeat);
foreach (Dot dot in dotlist)
{
bmp_template.SetPixel(dot.gyd.X, dot.gyd.Y, dot.color);
}
gif.AddFrame(bmp_template, delay: -1);
gif.AddFrame((Image)bitmapframelist[0].frame, delay: -1);
result = gif.Finish();
foreach (BitmapFrame item in bitmapframelist)
{
item.frame.Dispose();
}
}
}
else
{
for (int i = 0; i < count; i++)
{
bitmapframelist.Add(new BitmapFrame() { frame = (Bitmap)bmp_template.Clone() });
}
#region 计算每一帧文字坐标
if (count == 1)
{
bitmapframelist[0].x = x_align;
bitmapframelist[0].y = y_align;
bitmapframelist[0].z_width = 0;
}
else
{
for (int k = 0; k < count; k++)
{
if (k == 0)
{
bitmapframelist[0].x = x_align;
bitmapframelist[0].y = y_align;
bitmapframelist[0].z_width = g_template.MeasureString(GetScopeString(bitmapParam.textarr, 0, k + 2), text_font).Width - g_template.MeasureString(bitmapParam.textarr[k + 1], text_font).Width;
}
else
{
bitmapframelist[k].x = bitmapframelist[k - 1].x + bitmapframelist[k - 1].z_width;
bitmapframelist[k].y = y_align;
bitmapframelist[k].z_width = g_template.MeasureString(GetScopeString(bitmapParam.textarr, 0, k + 1), text_font).Width - g_template.MeasureString(GetScopeString(bitmapParam.textarr, 0, k), text_font).Width;
}
}
}
#endregion
#region 绘制每一帧文字坐标
for (int k = 0; k < count; k++)
{
using (Graphics graphics = Graphics.FromImage(bitmapframelist[k].frame))
{
graphics.DrawString(bitmapParam.textarr[k], text_font, text_brush, bitmapframelist[k].x, bitmapframelist[k].y);
foreach (Dot dot in dotlist) //画图片的前景干扰点
{
bitmapframelist[k].frame.SetPixel(dot.gyd.X, dot.gyd.Y, dot.color);
}
}
}
#endregion
#region 生成Gif
GifCore gif = new GifCore(bitmapStyle.Delay, bitmapStyle.Repeat);
if (count == 1)
{
foreach (Dot dot in dotlist)
{
bmp_template.SetPixel(dot.gyd.X, dot.gyd.Y, dot.color);
}
gif.AddFrame(bmp_template, delay: -1);
}
foreach (BitmapFrame item in bitmapframelist)
{
gif.AddFrame((Image)item.frame, delay: -1);
}
result = gif.Finish();
foreach (BitmapFrame item in bitmapframelist)
{
item.frame.Dispose();
}
#endregion
}
text_font.Dispose();
text_brush.Dispose();
g_template.Dispose();
bmp_template.Dispose();
return result;
}
//
///<summary>
///创建验证码的图片
///</summary>
///<param name="bitmapParam">验证码参数</param>
///<param name="isGif">Gif样式</param>
public static byte[] CreateValidateImageBytes(BitmapParam bitmapParam, BitmapStyle bitmapStyle)
{
using (MemoryStream ms = new MemoryStream())
{
Bitmap image = CreateValidateImage(bitmapParam, bitmapStyle);
image.Save(ms, bitmapStyle.IsGif ? ImageFormat.Gif : ImageFormat.Jpeg);
if (image != null)
image.Dispose();
return ms.ToArray();
}
}
//
///<summary>
///创建验证码的图片
///</summary>
///<param name="bitmapParam">验证码参数</param>
///<param name="isGif">Gif样式</param>
public static string CreateValidateImageBase64String(BitmapParam bitmapParam, BitmapStyle bitmapStyle)
{
return String.Format(imageStr, bitmapStyle.IsGif ? "gif" : "jpeg") + Convert.ToBase64String(CreateValidateImageBytes(bitmapParam, bitmapStyle));
}
/// <summary>
/// 拆分文本
/// </summary>
/// <param name="str"></param>
/// <returns></returns>
public static List<string> StringToArray(string str)
{
str = str.Trim();
List<string> result = new List<string>();
for (int i = 0; i < str.Length; i++)
{
result.Add(str.Substring(i, 1));
}
return result;
}
/// <summary>
///获取数组指定范围字符
/// </summary>
/// <param name="arr"></param>
/// <param name="start"></param>
/// <param name="len"></param>
/// <returns></returns>
public static string GetScopeString(List<string> arr, int start, int len)
{
string result = String.Empty;
for (int i = 0; i < len; i++)
{
result += arr[start + i];
}
return result;
}
/// <summary>
/// 计算
/// </summary>
/// <param name="type"></param>
/// <param name="value1"></param>
/// <param name="value2"></param>
/// <returns></returns>
private static int calculate(string type, int value1, int value2)
{
if (type == ArithmeticSymbol[0])//加
{
return value1 + value2;
}
else if (type == ArithmeticSymbol[1])//减
{
return value1 - value2;
}
else if (type == ArithmeticSymbol[2])//乘
{
return value1 * value2;
}
else
{
return value1 / value2;
}
}
/// <summary>
/// 干扰点
/// </summary>
private class Dot
{
public Point gyd;
public Color color;
}
/// <summary>
/// 图片帧
/// </summary>
private class BitmapFrame
{
/// <summary>
/// 帧
/// </summary>
public Bitmap frame;
public float x;
public float y;
public float z_width;
}
/// <summary>
/// 验证码（算术等式）
/// </summary>
public class ArithmeticEquation
{
/// <summary>
/// 算术等式
/// </summary>
public List<string> text;
/// <summary>
/// 算术值
/// </summary>
public string value;
}
/// <summary>
/// Gif帧类型
/// </summary>
public enum GifFrameType
{
/// <summary>
/// 每个字符一帧
/// </summary>
EveryFrame,
/// <summary>
/// 全部字符一帧
/// </summary>
FullFrame
}
/// <summary>
/// 验证码参数
/// </summary>
public class BitmapParam
{
public BitmapParam()
{
}
public BitmapParam(List<string> _textarr, int _width, int _height, Color _backColor, string _fontName, Color _fontBrushStrat, Color _fontBrushEnd, FontStyle _fontStyle)
{
this.textarr = _textarr;
this.width = _width;
this.height = _height;
this.backColor = _backColor;
this.fontName = _fontName;
this.fontBrushStrat = _fontBrushStrat;
this.fontBrushEnd = _fontBrushEnd;
this.fontStyle = _fontStyle;
}
/// <summary>
/// 验证码字符集
/// </summary>
public List<string> textarr;
/// <summary>
/// 验证码图片宽
/// </summary>
public int width = 120;
/// <summary>
/// 验证码图片高
/// </summary>
public int height = 50;
/// <summary>
/// 图片背景颜色
/// </summary>
public Color backColor = Color.White;
/// <summary>
/// 字体
/// </summary>
public string fontName = "微软雅黑";
/// <summary>
/// 字体画笔颜色开始
/// </summary>
public Color fontBrushStrat = Color.FromArgb(193, 0, 91);
/// <summary>
/// 字体画笔颜色结束
/// </summary>
public Color fontBrushEnd = Color.FromArgb(136, 193, 0);
/// <summary>
/// 验证码字体样式
/// </summary>
public FontStyle fontStyle = FontStyle.Bold | FontStyle.Italic;
}
/// <summary>
/// Gif样式
/// </summary>
public class BitmapStyle
{
public BitmapStyle()
{
}
public BitmapStyle(bool _IsGif, GifFrameType _FrameType, int _Delay, int _Repeat)
{
this.IsGif = _IsGif;
this.FrameType = _FrameType;
this.Delay = _Delay;
this.Repeat = _Repeat;
}
/// <summary>
/// 是否生成Gif动画
/// </summary>
public bool IsGif = false;
/// <summary>
/// Gif帧类型
/// </summary>
public GifFrameType FrameType = GifFrameType.EveryFrame;
/// <summary>
/// 帧之间的延迟(毫秒)
/// </summary>
public int Delay = 500;
/// <summary>
/// GIF重复计数(0表示永久)
/// </summary>
public int Repeat = 0;
}
}
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