安全验证码 木子.Net修改
功能说明:
1. 可自定义字体
2. 可自定义最大字号
3. 可自定义随机旋转的角度
4. 可自定义前景随机噪色量
5. 可外部生成随机码,由VerifyCode类处理成图片
6. 可自定义数字与英文字母随机出现的比率
7. 可自定义验证码长度
8. 可自定义验证码背景色
9. 可自定义验证码色彩(噪点色同验证码色一致)
功能说明:
1. 可自定义字体
2. 可自定义最大字号
3. 可自定义随机旋转的角度
4. 可自定义前景随机噪色量
5. 可外部生成随机码,由VerifyCode类处理成图片
6. 可自定义数字与英文字母随机出现的比率
7. 可自定义验证码长度
8. 可自定义验证码背景色
9. 可自定义验证码色彩(噪点色同验证码色一致)
下载DEMO源代码
附源代码：
ValidCode
using System;using System.Collections;using System.Configuration;using System.Data;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.HtmlControls;using System.Web.UI.WebControls;using System.IO;using System.Drawing;public partial class ValidCode : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{ VerifyCode vcode = new VerifyCode(); vcode.CreateImage(base.Context); Session["VerifyCode"] = vcode.RandomCode;
} public class VerifyCode { /**//// <summary> /// 验证码长度 /// </summary> private int _length = 4; /**//// <summary> /// 字体最大尺寸 /// </summary> private int _fontSize = 18; /**//// <summary> /// 边框，0时没有连框 /// </summary> private int _border = 0; /**//// <summary> /// 背景色 /// </summary> private Color _backgroundColor = Color.AliceBlue; /**//// <summary> /// 验证码色 /// </summary> private Color _fontColor = Color.Blue; /**//// <summary> /// 验证码中的数字出现机率 ，越大出现的数字机率越大 /// </summary> private int _rateNumber = 10; /**//// <summary> /// 随机生成的验证码 /// </summary> private string _randomChars; /**//// <summary> /// 随机码的旋转角度 /// </summary> private int _randomAngle = 40; /**//// <summary> /// 字体 /// </summary> private string _fontFamily = "Verdana"; /**//// <summary> /// 噪点数量,0 时不用 /// </summary> private int _chaosNumber = 0; /**//// <summary> /// 随机种子，公用 /// </summary> private Random random = new Random(); /**//// <summary> /// 噪点 /// </summary> /// <param name="chaosNumber">噪点</param> public VerifyCode(int chaosNumber) { _chaosNumber = chaosNumber; } /**//// <summary> /// 长度，噪点 /// </summary> /// <param name="length">长度</param> /// <param name="chaosNumber">噪点</param> public VerifyCode(int length, int chaosNumber) { _length = length; _chaosNumber = chaosNumber; } /**//// <summary> /// 长度，噪点，数字机率 /// </summary> /// <param name="length">长度</param> /// <param name="chaosNumber">噪点</param> /// <param name="rate">数字机率越大，生成的随机码中数字占的比例越多</param> public VerifyCode(int length, int chaosNumber, int rate) { _length = length; _chaosNumber = chaosNumber; _rateNumber = rate; } 验证码长度(默认4个)#region 验证码长度(默认4个) /**//// <summary> /// 验证码长度(默认4个) /// </summary> public int Length { get { return _length; } set { _length = value; } } #endregion 字体最大尺寸(默认18)#region 字体最大尺寸(默认18) /**//// <summary> /// 字体最大尺寸(默认18) /// </summary> public int FontSize { get { return _fontSize; } set { _fontSize = value; } } #endregion 边框（默认0 没有连框）#region 边框（默认0 没有连框） /**//// <summary> /// 边框（默认0 没有连框） /// </summary> public int Border { get { return _border; } set { _border = value; } } #endregion 自定义背景色(默认Color.AliceBlue)#region 自定义背景色(默认Color.AliceBlue) /**//// <summary> /// 自定义背景色(默认Color.AliceBlue) /// </summary> public Color BackgroundColor { get { return _backgroundColor; } set { _backgroundColor = value; } } #endregion 验证码色(默认Color.Blue)#region 验证码色(默认Color.Blue) /**//// <summary> /// 验证码色(默认Color.Blue) /// </summary> public Color FontColor { get { return _fontColor; } set { _fontColor = value; } } #endregion 随机生成的验证码#region 随机生成的验证码 /**//// <summary> /// 随机生成的验证码 /// </summary> public string RandomCode { get { return _randomChars; } set { _randomChars = value.ToUpper(); } } #endregion 验证码中的数字出现机率,越大出现的数字机率越大(默认10)#region 验证码中的数字出现机率,越大出现的数字机率越大(默认10) /**//// <summary> /// 验证码中的数字出现机率 /// </summary> public int RateNumber { get { return _rateNumber; } set { _rateNumber = value; } } #endregion 随机码的旋转角度(默认40度)#region 随机码的旋转角度(默认40度) /**//// <summary> /// 随机码的旋转角度(默认40度) /// </summary> public int RandomAngle { get { return _randomAngle; } set { _randomAngle = value; } } #endregion 字体#region 字体 /**//// <summary> /// 字体 /// </summary> public string FontFamily { get { return _fontFamily; } set { _fontFamily = value; } } #endregion 噪点数量(默认值为2)#region 噪点数量(默认值为2) /**//// <summary> /// 噪点数量(默认值为2) /// </summary> public int ChaosNumber { get { return _chaosNumber; } set { _chaosNumber = value; } } #endregion /**//// <summary> /// 生成随机验证码 /// </summary> private void CreateCode() { //有外部输入验证码时不用产生，否则随机生成 if (!string.IsNullOrEmpty(_randomChars)) { return; } char code; for (int i = 0; i < _length; i++) { int rand = random.Next(); if (rand % _rateNumber == 0) { code = (char)('A' + (char)(rand % 26)); } else { code = (char)('0' + (char)(rand % 10)); } _randomChars += code.ToString(); } //Response.Cookies.Add(new HttpCookie("ValidCode", _randomChars)); } /**//// <summary> /// 背景噪点生成 /// </summary> /// <param name="graph"></param> private void CreateBackgroundChaos(Bitmap map, Graphics graph) { Pen blackPen = new Pen(Color.Azure, 0); for (int i = 0; i < map.Width * 2; i++) { int x = random.Next(map.Width); int y = random.Next(map.Height); graph.DrawRectangle(blackPen, x, y, 1, 1); } } /**//// <summary> /// 前景色噪点 /// </summary> /// <param name="map"></param> private void CreaetForeChaos(Bitmap map) { for (int i = 0; i < map.Width * _chaosNumber; i++) { int x = random.Next(map.Width); int y = random.Next(map.Height); //map.SetPixel(x, y, Color.FromArgb(random.Next(300))); map.SetPixel(x, y, _fontColor); } } /**//// <summary> /// 创建随机码图片 /// </summary> /// <param name="context"></param> public void CreateImage(HttpContext context) { CreateCode(); //创建验证码 Bitmap map = new Bitmap((int)(_randomChars.Length * 15), 24); //创建图片背景 Graphics graph = Graphics.FromImage(map); //graph.FillRectangle(new SolidBrush(Color.Black), 0, 0, map.Width+1, map.Height+1); //填充一个有背景的矩形 //if (_border > 0) //画一个边框 //{ // graph.DrawRectangle(new Pen(Color.Black, 0), 0, 0, map.Width - _border, map.Height - _border); //} //graph.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias; //模式 graph.Clear(_backgroundColor); //清除画面，填充背景 SolidBrush brush = new SolidBrush(_fontColor); //画笔 Point dot = new Point(12, 12); //CreateBackgroundChaos(map,graph); //背景噪点生成 CreaetForeChaos(map); //前景色噪点 //文字距中 StringFormat format = new StringFormat(StringFormatFlags.NoClip); format.Alignment = StringAlignment.Center; format.LineAlignment = StringAlignment.Center; //验证码旋转，防止机器识别 char[] chars = _randomChars.ToCharArray(); //拆散字符串成单字符数组 for (int i = 0; i < chars.Length; i++) { Font fontstyle = new Font(_fontFamily, random.Next(_fontSize - 3, _fontSize), FontStyle.Regular); //字体样式 float angle = random.Next(-_randomAngle, _randomAngle); //转动的度数 graph.TranslateTransform(dot.X, dot.Y); //移动光标到指定位置 graph.RotateTransform(angle); graph.DrawString(chars[i].ToString(), fontstyle, brush, -2, 2, format); graph.RotateTransform(-angle); //转回去 graph.TranslateTransform(2, -dot.Y); //移动光标到指定位置 } //生成图片 MemoryStream ms = new MemoryStream(); map.Save(ms, System.Drawing.Imaging.ImageFormat.Gif); context.Response.ClearContent(); context.Response.ContentType = "image/gif"; context.Response.BinaryWrite(ms.ToArray()); graph.Dispose(); map.Dispose(); } }
}源码作者：zhouyu http://max.cszi.com
