- using System;
- using System.Data;
- using System.Configuration;
- using System.web;
- using System.Web.Security;
- using System.Web.UI;
- using System.Web.UI.WebControls;
- using System.Web.UI.htmlControls;
- using System.Drawing;
- namespace AppUtility.Tools
- {
- /// <summary>
- /// VerifyCode 的摘要说明。
- /// </summary>
- public class VerifyCodeImgHelper
- {
- public VerifyCodeImgHelper()
- {
- //
- // TODO: 在此处添加构造函数逻辑
- //
- }
- #region 验证码长度(默认4个验证码的长度)
- int length = 4;
- public int Length
- {
- get { return length; }
- set { length = value; }
- }
- #endregion
- #region 验证码字体大小默认11像素
- int fontSize = 11;
- public int FontSize
- {
- get { return fontSize; }
- set { fontSize = value; }
- }
- #endregion
- #region 边框补
- int padding = 1;
- public int Padding
- {
- get { return padding; }
- set { padding = value; }
- }
- #endregion
- #region 是否输出燥点(默认不输出)
- bool chaos = true;
- public bool Chaos
- {
- get { return chaos; }
- set { chaos = value; }
- }
- #endregion
- #region 输出燥点的颜色(默认灰色)
- Color chaosColor = Color.LightGray;
- public Color ChaosColor
- {
- get { return chaosColor; }
- set { chaosColor = value; }
- }
- #endregion
- #region 自定义背景色(默认白色)
- Color backgroundColor = Color.White;
- public Color BackgroundColor
- {
- get { return backgroundColor; }
- set { backgroundColor = value; }
- }
- #endregion
- #region 自定义随机颜色数组
- Color[] colors = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.DarkMagenta, Color.Brown, Color.DarkCyan, Color.Purple };
- public Color[] Colors
- {
- get { return colors; }
- set { colors = value; }
- }
- #endregion
- #region 自定义字体数组
- string[] fonts = { "Gautami","Tahoma","宋体" };
- public string[] Fonts
- {
- get { return fonts; }
- set { fonts = value; }
- }
- #endregion
- #region 自定义随机码字符串序列(使用逗号分隔)
- string codeSerial = "a,b,c,d,e,f,g,h,i,j,k,m,n,p,q,2,3,4,5,s,t,u,v,w,x,y,z,6,7,8,A,B,D,E,F,G,H,K,M,N,Q";//
- public string CodeSerial
- {
- get { return codeSerial; }
- set { codeSerial = value; }
- }
- #endregion
- #region 生成校验码图片
- public Bitmap CreateImageCode(string code)
- {
- int fSize = FontSize;
- int fWidth = fSize + Padding;
- int imageWidth = 60;
- int imageHeight = 25;
- System.Drawing.Bitmap image = new System.Drawing.Bitmap(imageWidth, imageHeight);
- Graphics g = Graphics.FromImage(image);
- g.Clear(BackgroundColor);
- Random rand = new Random();
- //给背景添加随机生成的燥点
- if (this.Chaos)
- {
- Pen pen = new Pen(ChaosColor, 0);
- int c = Length * 10;
- for (int i = 0; i < c; i++)
- {
- int x = rand.Next(image.Width);
- int y = rand.Next(image.Height);
- g.DrawRectangle(pen, x, y, 1, 1);
- }
- }
- int left = 0, top = 0;
- Font f;
- Brush b;
- int cindex, findex;
- //随机字体和颜色的验证码字符
- for (int i = 0; i < code.Length; i++)
- {
- cindex = rand.Next(Colors.Length - 1);
- findex = rand.Next(Fonts.Length - 1);
- f = new System.Drawing.Font(Fonts[findex], fSize, System.Drawing.FontStyle.Bold);
- b = new System.Drawing.SolidBrush(Colors[cindex]);
- if (i % 2 == 1)
- {
- top = 2;
- }
- else
- {
- top = 1;
- }
- left = i * fWidth;
- g.DrawString(code.Substring(i, 1), f, b, left, top);
- }
- //画一个边框边框颜色为Color.Gainsboro
- g.DrawRectangle(new Pen(Color.Gainsboro, 0), 0, 0, image.Width - 1, image.Height - 1);
- g.Dispose();
- return image;
- }
- #endregion
- #region 将创建好的图片输出到页面
- public void CreateImageOnPage(string code, HttpContext context)
- {
- using (System.IO.MemoryStream ms = new System.IO.MemoryStream())
- {
- using (Bitmap image = this.CreateImageCode(code))
- {
- image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
- context.Response.ClearContent();
- context.Response.ContentType = "image/Jpeg";
- context.Response.BinaryWrite(ms.GetBuffer());
- ms.Close();
- }
- }
- }
- #endregion
- #region 生成随机字符码
- public string CreateVerifyCode(int codeLen)
- {
- if (codeLen == 0)
- {
- codeLen = Length;
- }
- string[] arr = CodeSerial.Split(',');
- string code = "";
- int temp = -1;
- Random rand = new Random();
- for (int i = 0; i < codeLen; i++)
- {
- if (temp != -1)
- {
- rand = new Random(temp * i * ((int)DateTime.Now.Ticks));
- }
- int t = rand.Next(arr.Length-1);
- while (temp == t)
- {
- t = rand.Next(arr.Length-1);
- }
- temp = t;
- code += arr[t];
- }
- return code;
- }
- #endregion
- }
- }
- //该片段来自于http://www.codesnippet.cn/detail/091020136299.html
来源: http://www.codesnippet.cn/detail/091020136299.html