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using System;using System.DrawingCore;using System.DrawingCore.Drawing2D;using System.DrawingCore.Imaging;using System.IO;namespace Shentun.Utilities{ public sealed class ValidationCodeHelper { #region 单例模式
//创建私有化静态obj锁
private static readonly object _lockObject = new object(); //创建私有静态字段，接收类的实例化对象
private static ValidationCodeHelper _validationCodeHelper = null; //构造函数私有化
private ValidationCodeHelper() { } //创建单利对象资源并返回
public static ValidationCodeHelper Instance { get { if (_validationCodeHelper == null) { lock (_lockObject) { if (_validationCodeHelper == null) _validationCodeHelper = new ValidationCodeHelper(); } } return _validationCodeHelper; } } #endregion
#region 生产验证码
/// <summary>
/// 1.数字验证码
/// </summary>
/// <param name="length"></param>
/// <returns></returns>
private string CreateNumberValidationCode(int length) { int[] randMembers = new int[length]; int[] validateNums = new int[length]; string validateNumberStr = ""; //生成起始序列值
int seekSeek = unchecked((int)DateTime.Now.Ticks); Random seekRand = new Random(seekSeek); int beginSeek = seekRand.Next(0, Int32.MaxValue - length * 10000); int[] seeks = new int[length]; for (int i = 0; i < length; i++) { beginSeek += 10000; seeks[i] = beginSeek; } //生成随机数字
for (int i = 0; i < length; i++) { Random rand = new Random(seeks[i]); int pownum = 1 * (int)Math.Pow(10, length); randMembers[i] = rand.Next(pownum, Int32.MaxValue); } //抽取随机数字
for (int i = 0; i < length; i++) { string numStr = randMembers[i].ToString(); int numLength = numStr.Length; Random rand = new Random(); int numPosition = rand.Next(0, numLength - 1); validateNums[i] = Int32.Parse(numStr.Substring(numPosition, 1)); } //生成验证码
for (int i = 0; i < length; i++) { validateNumberStr += validateNums[i].ToString(); } return validateNumberStr; }
/// <summary>
/// 2.字母验证码
/// </summary>
/// <param name="length">字符长度</param>
/// <returns>验证码字符</returns>
private string CreateAbcValidationCode(int length) { char[] validation = new char[length]; char[] dictionary = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', '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', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z' }; Random random = new Random(); for (int i = 0; i < length; i++) { validation[i] = dictionary[random.Next(dictionary.Length - 1)]; } return new string(validation); }
/// <summary>
/// 3.混合验证码
/// </summary>
/// <param name="length">字符长度</param>
/// <returns>验证码字符</returns>
private string CreateMixValidationCode(int length) { char[] validation = new char[length]; char[] dictionary = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z' }; Random random = new Random(); for (int i = 0; i < length; i++) { validation[i] = dictionary[random.Next(dictionary.Length - 1)]; } return new string(validation); }
/// <summary>
/// 产生验证码（随机产生4-6位）
/// </summary>
/// <param name="type">验证码类型：数字，字符，符合</param>
/// <returns></returns>
public string CreateValidationCode(ValidationCodeType type, int length = 4) { string validationCode = string.Empty; Random random = new Random(); switch (type) { case ValidationCodeType.NumberValidationCode: validationCode = Instance.CreateNumberValidationCode(length); break; case ValidationCodeType.AbcValidationCode: validationCode = Instance.CreateAbcValidationCode(length); break; case ValidationCodeType.MixValidationCode: validationCode = Instance.CreateMixValidationCode(length); break; } return validationCode; } #endregion
#region 验证码图片
/// <summary>
/// 验证码图片 => Bitmap
/// </summary>
/// <param name="validationCode">验证码</param>
/// <param name="width">宽</param>
/// <param name="height">高</param>
/// <returns>Bitmap</returns>
public Bitmap CreateBitmapByImageValidationCode(string validationCode, int width, int height) { Font font = new Font("Arial", 14, (FontStyle.Bold | FontStyle.Italic)); Brush brush; Bitmap bitmap = new Bitmap(width, height); Graphics g = Graphics.FromImage(bitmap); SizeF totalSizeF = g.MeasureString(validationCode, font); SizeF curCharSizeF; PointF startPointF = new PointF(0, (height - totalSizeF.Height) / 2); Random random = new Random(); //随机数产生器
g.Clear(Color.White); //清空图片背景色
for (int i = 0; i < validationCode.Length; i++) { brush = new LinearGradientBrush(new Point(0, 0), new Point(1, 1), Color.FromArgb(random.Next(255), random.Next(255), random.Next(255)), Color.FromArgb(random.Next(255), random.Next(255), random.Next(255))); g.DrawString(validationCode[i].ToString(), font, brush, startPointF); curCharSizeF = g.MeasureString(validationCode[i].ToString(), font); startPointF.X += curCharSizeF.Width; }
//画图片的干扰线
for (int i = 0; i < 10; i++) { int x1 = random.Next(bitmap.Width); int x2 = random.Next(bitmap.Width); int y1 = random.Next(bitmap.Height); int y2 = random.Next(bitmap.Height); g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2); }
//画图片的前景干扰点
for (int i = 0; i < 100; i++) { int x = random.Next(bitmap.Width); int y = random.Next(bitmap.Height); bitmap.SetPixel(x, y, Color.FromArgb(random.Next())); }
g.DrawRectangle(new Pen(Color.Silver), 0, 0, bitmap.Width - 1, bitmap.Height - 1); //画图片的边框线
g.Dispose(); return bitmap; }
/// <summary>
/// 验证码图片 => byte[]
/// </summary>
/// <param name="validationCode">验证码</param>
/// <param name="width">宽</param>
/// <param name="height">高</param>
/// <returns>byte[]</returns>
public byte[] CreateByteByImageValidationCode(string validationCode, int width, int height) { Font font = new Font("Arial", 14, (FontStyle.Bold | FontStyle.Italic)); Brush brush; Bitmap bitmap = new Bitmap(width, height); Graphics g = Graphics.FromImage(bitmap); SizeF totalSizeF = g.MeasureString(validationCode, font); SizeF curCharSizeF; PointF startPointF = new PointF(0, (height - totalSizeF.Height) / 2); Random random = new Random(); //随机数产生器
g.Clear(Color.White); //清空图片背景色
for (int i = 0; i < validationCode.Length; i++) { brush = new LinearGradientBrush(new Point(0, 0), new Point(1, 1), Color.FromArgb(random.Next(255), random.Next(255), random.Next(255)), Color.FromArgb(random.Next(255), random.Next(255), random.Next(255))); g.DrawString(validationCode[i].ToString(), font, brush, startPointF); curCharSizeF = g.MeasureString(validationCode[i].ToString(), font); startPointF.X += curCharSizeF.Width; }
//画图片的干扰线
for (int i = 0; i < 10; i++) { int x1 = random.Next(bitmap.Width); int x2 = random.Next(bitmap.Width); int y1 = random.Next(bitmap.Height); int y2 = random.Next(bitmap.Height); g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2); }
//画图片的前景干扰点
for (int i = 0; i < 100; i++) { int x = random.Next(bitmap.Width); int y = random.Next(bitmap.Height); bitmap.SetPixel(x, y, Color.FromArgb(random.Next())); }
g.DrawRectangle(new Pen(Color.Silver), 0, 0, bitmap.Width - 1, bitmap.Height - 1); //画图片的边框线
g.Dispose();
//保存图片数据
MemoryStream stream = new MemoryStream(); bitmap.Save(stream, ImageFormat.Jpeg); byte[] imageByte = stream.ToArray(); //输出图片流
return imageByte;
} #endregion
}
public enum ValidationCodeType { NumberValidationCode, AbcValidationCode, MixValidationCode };}
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