验证码类代码,Asp.Net代码库,德仔网

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【Asp.Net】验证码类

作者:brainmao / 发布于2014/6/26/ 558

直接封装好的验证码类,随机数生成、噪点增加、图片获取，直接引用该类方法就可以实现


	using System.Collections.Generic;
	using System.IO;
	using System.Drawing;
	using System.Text;
	using System;

	namespace Core.Common.Tool
	{
	 /// <summary>
	 /// 生成验证码和验证图片的方法类
	 /// </summary>
	 public static class ValidateCode
	 {
	 #region 静态方法

	 /// <summary>
	 /// 生成验证码
	 /// </summary>
	 /// <returns>验证码</returns>
	 public static string CreateValidateCode()
	 {
	 int number;
	 char code;
	 string verifyCode = string.Empty;

	 Random random = new Random();

	 for (int i = 0; i < 5; i++)
	 {
	 number = random.Next();

	 if (number % 2 == 0)
	 code = (char)('0' + (char)(number % 10));
	 else
	 code = (char)('A' + (char)(number % 26));

	 verifyCode += code.ToString();
	 }

	 return verifyCode;
	 }

	 /// <summary>
	 /// 生成验证码图片
	 /// </summary>
	 /// <param name="validateCode">验证码</param>
	 /// <returns>验证码图片</returns>
	 public static Bitmap CreateValidateCodeImage(string validateCode)
	 {
	 if (validateCode == null || validateCode.Trim() == String.Empty)
	 return null;

	 Bitmap image = new Bitmap((int)Math.Ceiling((validateCode.Length * 12.5)), 22);
	 Graphics g = Graphics.FromImage(image);

	 try
	 {
	 Random random = new Random();

	 g.Clear(Color.White);

	 for (int i = 0; i < 25; i++)
	 {
	 int x1 = random.Next(image.Width);
	 int x2 = random.Next(image.Width);
	 int y1 = random.Next(image.Height);
	 int y2 = random.Next(image.Height);

	 g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
	 }

	 Font font = new Font("Arial", 12, (FontStyle.Bold | FontStyle.Italic));
	 System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true);
	 g.DrawString(validateCode, font, brush, 2, 2);

	 for (int i = 0; i < 100; i++)
	 {
	 int x = random.Next(image.Width);
	 int y = random.Next(image.Height);

	 image.SetPixel(x, y, Color.FromArgb(random.Next()));
	 }

	 g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);

	 return image;
	 }
	 catch
	 {
	 return null;
	 }
	 finally
	 {
	 g.Dispose();
	 image.Dispose();
	 }
	 }

	 /// <summary>
	 /// 生成验证码图片
	 /// 并保存到文件（GIF格式）
	 /// </summary>
	 /// <param name="validateCode">验证码</param>
	 /// <param name="validateCodeFilePath">文件路径（包含文件名）</param>
	 /// <returns>是否生成成功</returns>
	 public static bool CreateValidateCodeImage(string validateCode, string validateCodeFilePath)
	 {
	 if (validateCode == null || validateCode.Trim() == String.Empty)
	 return false;

	 Bitmap image = new Bitmap((int)Math.Ceiling((validateCode.Length * 12.5)), 22);
	 Graphics g = Graphics.FromImage(image);

	 try
	 {
	 Random random = new Random();

	 g.Clear(Color.White);

	 for (int i = 0; i < 25; i++)
	 {
	 int x1 = random.Next(image.Width);
	 int x2 = random.Next(image.Width);
	 int y1 = random.Next(image.Height);
	 int y2 = random.Next(image.Height);

	 g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
	 }

	 Font font = new Font("Arial", 12, (FontStyle.Bold | FontStyle.Italic));
	 System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true);
	 g.DrawString(validateCode, font, brush, 2, 2);

	 for (int i = 0; i < 100; i++)
	 {
	 int x = random.Next(image.Width);
	 int y = random.Next(image.Height);

	 image.SetPixel(x, y, Color.FromArgb(random.Next()));
	 }

	 g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);

	 image.Save(validateCodeFilePath, System.Drawing.Imaging.ImageFormat.Gif);

	 return true;
	 }
	 catch
	 {
	 return false;
	 }
	 finally
	 {
	 g.Dispose();
	 image.Dispose();
	 }
	 }

	 #endregion
	 }
	}

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