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)10. 可自定义字体
| using System;using System.Collections.Generic;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;using System.IO;using System.Drawing;namespace CS.Common.Utility{/// <summary>/// Chaos验证码/// FileName : VerifyCode.cs/// Verion : 0.20/// Author : zhouyu http://max.cszi.com/// Update : 2007-10-10 51aspx.com/// Description : 验证码随机旋转一定角度,可使用前景色,背景色效果不大就不用了/// </summary>public class VerifyCode{private int _length = 4; //验证码长度private int _fontSize = 18; //字体最大尺寸private int _border = 0; //边框，0时没有连框private Color _backgroundColor = Color.AliceBlue; //背景色private Color _fontColor = Color.Blue; //验证码色51aspxprivate int _rateNumber = 10; //验证码中的数字出现机率 ，越大出现的数字机率越大private string _randomChars; //随机生成的验证码private int _randomAngle = 40; //随机码的旋转角度private string _fontFamily = "Verdana"; //字体private int _chaosNumber = 0; //噪点数量 ,0 时不用private Random random = new Random(); //随机种子www,365xinxi.net公用public VerifyCode(){}/// <summary>/// 重载一 ：噪点/// </summary>/// <param name="chaosNumber"></param>public VerifyCode(int chaosNumber){_chaosNumber = chaosNumber;}/// <summary>/// 重载二：长度，噪点/// </summary>/// <param name="length"></param>/// <param name="chaosNumber"></param>public VerifyCode(int length, int chaosNumber){_length = length;_chaosNumber = chaosNumber;}/// <summary>/// 重载三：长度，噪点，数字机率/// </summary>/// <param name="length"></param>/// <param name="chaosNumber"></param>/// <param name="rate">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;}#region .Length 验证码长度(默认4个)public int Length{get { return _length; }set { _length = value; }}#endregion#region .FontSize 字体最大尺寸(默认18)public int FontSize{get { return _fontSize; }set { _fontSize = value; }}#endregion#region .Border 边框（默认0 没有连框）public int Border{get { return _border; }set { _border = value; }}#endregion#region .BackgroundColor 自定义背景色(默认Color.AliceBlue)public Color BackgroundColor{get { return _backgroundColor; }set { _backgroundColor = value; }}#endregion#region .FontColor 验证码色(默认Color.Blue)public Color FontColor{get { return _fontColor; }set { _fontColor = value; }}#endregion#region .RandomCode 随机生成的验证码public string RandomCode{get { return _randomChars; }set { _randomChars = value.ToUpper(); }}#endregion#region .RateNumber 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)public int RateNumber{get { return _rateNumber; }set { _rateNumber = value; }}#endregion#region .RandomAngle 随机码的旋转角度(默认40度)public int RandomAngle{get { return _randomAngle; }set { _randomAngle = value; }}#endregion#region .FontFamily 字体public string FontFamily{get { return _fontFamily; }set { _fontFamily = value; }}#endregion#region .ChaosNumber 噪点数量(默认值为2)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();}}/// <summary>/// 背景噪点生成www.365xinxi.net/// </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();}}}使用方法
using System;using System.Data;using System.Configuration;using System.Collections;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;using CS.Common.Utility;namespace Test{public partial class Vcode : System.Web.UI.Page{protected void Page_Load(object sender, EventArgs e){VerifyCode vcode = new VerifyCode();vcode.CreateImage(base.Context);Session["VerifyCode"] = vcode.RandomCode;}}}
|
