using System.Collections.Generic;
using System.Text;
using System.Threading;
using System.Drawing;
using System.Drawing.Drawing2D;
namespace FreeOH.Validate
{
/// <summary>
/// 本类用于产生随机的验证码
/// </summary>
public class ValidationCode
{
//用户存取验证码字符串
public string validationCode =
String.Empty;
Graphics g =
null;
int bgWidth =
0;
int bgHeight =
0;
public string FontFace =
"Comic Sans MS";
public int FontSize =
9;
public Color foreColor = Color.FromArgb(
220,
220,
220);
public Color backColor = Color.FromArgb(
190,
190,
190);
public Color mixedLineColor = Color.FromArgb(
220,
220,
220);
public int mixedLineWidth =
1;
public int mixedLineCount =
5;
#region 根据指定长度，返回随机验证码
/// <summary>
/// 根据指定长度，返回随机验证码
/// </summary>
/// <param name="length">制定长度</param>
/// <returns>随即验证码</returns>
public string Next(
int length)
{
this.validationCode =
GetRandomCode(length);
return this.validationCode;
}
#endregion
#region 根据指定长度及背景图片样式，返回带有随机验证码的图片对象
/// <summary>
/// 根据指定长度及背景图片样式，返回带有随机验证码的图片对象
/// </summary>
/// <param name="length">指定长度</param>
/// <param name="hatchStyle">背景图片样式</param>
/// <returns>Image对象</returns>
public Image NextImage(
int length, HatchStyle hatchStyle,
bool allowMixedLines)
{
this.validationCode =
GetRandomCode(length);
//校验码字体
Font myFont =
new Font(FontFace, FontSize);
//根据校验码字体大小算出背景大小
bgWidth = (
int)myFont.Size * length +
4;
bgHeight = (
int)myFont.Size *
2;
//生成背景图片
Bitmap myBitmap =
new Bitmap(bgWidth, bgHeight);
g =
Graphics.FromImage(myBitmap);
this.DrawBackground(hatchStyle);
this.DrawValidationCode(
this.validationCode,myFont);
if (allowMixedLines)
this.DrawMixedLine();
return (Image)myBitmap;
}
#endregion
#region 内部方法：绘制验证码背景
private void DrawBackground(HatchStyle hatchStyle)
{
//设置填充背景时用的笔刷
HatchBrush hBrush =
new HatchBrush(hatchStyle, backColor);
//填充背景图片
g.FillRectangle(hBrush,
0,
0,
this.bgWidth,
this.bgHeight);
}
#endregion
#region 内部方法：绘制验证码
private void DrawValidationCode(
string vCode, Font font)
{
g.DrawString(vCode, font, new SolidBrush(
this.foreColor),
2,
2);
}
#endregion
#region 内部方法：绘制干扰线条
/// <summary>
/// 绘制干扰线条
/// </summary>
private void DrawMixedLine()
{
for (
int i =
0; i < mixedLineCount; i++
)
{
g.DrawBezier(new Pen(
new SolidBrush(mixedLineColor), mixedLineWidth), RandomPoint(), RandomPoint(), RandomPoint(), RandomPoint());
}
}
#endregion
#region 内部方法：返回指定长度的随机验证码字符串
/// <summary>
/// 根据指定大小返回随机验证码
/// </summary>
/// <param name="length">字符串长度</param>
/// <returns>随机字符串</returns>
private string GetRandomCode(
int length)
{
StringBuilder sb =
new StringBuilder(
6);
for (
int i =
0; i < length; i++
)
{
sb.Append(Char.ConvertFromUtf32(RandomAZ09()));
}
return sb.ToString();
}
#endregion
#region 内部方法：产生随机数和随机点
/// <summary>
/// 产生0-9A-Z的随机字符代码
/// </summary>
/// <returns>字符代码</returns>
private int RandomAZ09()
{
Thread.Sleep(15);
int result =
48;
Random ram =
new Random();
int i = ram.Next(
2);
switch (i)
{
case 0:
result = ram.Next(
48,
58);
break;
case 1:
result = ram.Next(
65,
91);
break;
}
return result;
}
/// <summary>
/// 返回一个随机点，该随机点范围在验证码背景大小范围内
/// </summary>
/// <returns>Point对象</returns>
private Point RandomPoint()
{
Thread.Sleep(15);
Random ram =
new Random();
Point point =
new Point(ram.Next(
this.bgWidth), ram.Next(
this.bgHeight));
return point;
}
#endregion
}
}
把图片输入到页面
System.IO.MemoryStream ms =
new System.IO.MemoryStream();
image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
System.Web.HttpContext.Current.Response.ClearContent();
System.Web.HttpContext.Current.Response.ContentType =
"image/Gif";
System.Web.HttpContext.Current.Response.BinaryWrite(ms.ToArray());
生成验证码 点击可刷新先建一张生成验证码的网页CheckCode.aspx
CheckCode.aspx.cs代码如下添加引用:
using System.IO;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
然后是显示验证码的页面的html中加入
<img src="CheckCode.aspx" id="yzm" alt="点击刷新" />
在</head>之前一行加入javascript脚本语言如下(当然写在JS文件里面更好):
function reloadcode(){ document.getElementById("yzm").src ="CheckCode.aspx";}
转载于:https://www.cnblogs.com/tuyile006/p/3226023.html
