演示地址:http://max.cszi.com/VerifyCode.aspx
ChaosSea验证码0.20版
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
本人觉得用上随机角度就行了,不用前景噪点,因为这个东东会耗一定的资源
C#
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
/// 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
private 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，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
/// </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:
C#
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;
}
}
}转换自: https://www.cnblogs.com/atwind/archive/2008/03/28/1127350.html