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