【asp】asp.net 验证码生成和刷新及验证-net-验证码

欢迎您访问我爱IT技术网，今天小编为你分享的编程技术是：【asp.net 验证码生成和刷新及验证】，下面是详细的讲解！

asp.net 验证码生成和刷新及验证

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Text;
//// <summary>
/// 页面验证码程序
/// 使用：在页面中加入HTML代码 <img src="VerifyCode.aspx">
/// </summary>
public partial class VerifyCode : System.Web.UI.Page
...{
static string[] FontItems=new string[] ...{ "Arial",
"Helvetica",
"Geneva",
"sans-serif",
"Verdana"
};
static Brush[] BrushItems=new Brush[] ...{ Brushes.OliveDrab,
Brushes.ForestGreen,
Brushes.DarkCyan,
Brushes.LightSlateGray,
Brushes.RoyalBlue,
Brushes.SlateBlue,
Brushes.DarkViolet,
Brushes.MediumVioletRed,
Brushes.IndianRed,
Brushes.Firebrick,
Brushes.Chocolate,
Brushes.Peru,
Brushes.Goldenrod
};
static string[] BrushName=new string[] ...{ "OliveDrab",
"ForestGreen",
"DarkCyan",
"LightSlateGray",
"RoyalBlue",
"SlateBlue",
"DarkViolet",
"MediumVioletRed",
"IndianRed",
"Firebrick",
"Chocolate",
"Peru",
"Goldenrod"
};
private static Color BackColor=Color.White;
private static Pen BorderColor=Pens.DarkGray;
private static int Width=52;
private static int Height=21;
private Random _random;
private string _code;
private int _brushNameIndex;
override protected void OnInit(EventArgs e)
...{
//
// CODEGEN: This call is required by the ASP.NET Web Form Designer.
//
//InitializeComponent();
//base.OnInit(e);
}
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
...{
//this.Load +=new System.EventHandler(this.Page_Load);
}
/// <summary>
///
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
public void Page_Load(object sender, System.EventArgs e)
...{
if (!IsPostBack)
...{
//
// TODO : initialize
//
this._random=new Random();
this._code=GetRandomCode();
//
// TODO : use Session["code"] save the VerifyCode
//
Session["code"]=this._code;
//
// TODO : output Image
//
this.SetPageNoCache();
this.OnPaint();
}
}
/// <summary>
/// 设置页面不被缓存
/// </summary>
private void SetPageNoCache()
...{
Response.Buffer=true;
Response.ExpiresAbsolute=System.DateTime.Now.AddSeconds(-1);
Response.Expires=0;
Response.CacheControl="no-cache";
Response.AppendHeader("Pragma","No-Cache");
}
/// <summary>
/// 取得一个 4 位的随机码
/// </summary>
/// <returns></returns>
private string GetRandomCode()
...{
return Guid.NewGuid().ToString().Substring(0, 4);
}
/// <summary>
/// 随机取一个字体
/// </summary>
/// <returns></returns>
private Font GetFont()
...{
int fontIndex=_random.Next(0, FontItems.Length);
FontStyle fontStyle=GetFontStyle(_random.Next(0, 2));
return new Font(FontItems[fontIndex], 12, fontStyle);
}
/// <summary>
/// 取一个字体的样式
/// </summary>
/// <param name="index"></param>
/// <returns></returns>
private FontStyle GetFontStyle(int index)
...{
switch (index)
...{
case 0:
return FontStyle.Bold;
case 1:
return FontStyle.Italic;
default:
return FontStyle.Regular;
}
}
/// <summary>
/// 随机取一个笔刷
/// </summary>
/// <returns></returns>
private Brush GetBrush()
...{
int brushIndex=_random.Next(0, BrushItems.Length);
_brushNameIndex=brushIndex;
return BrushItems[brushIndex];
}
/// <summary>
/// 绘画事件
/// </summary>
private void OnPaint()
...{
Bitmap objBitmap=null;
Graphics g=null;
try
...{
objBitmap=new Bitmap(Width, Height);
g=Graphics.FromImage(objBitmap);
Paint_Background(g);
Paint_Text(g);
Paint_TextStain(objBitmap);
Paint_Border(g);
objBitmap.Save(Response.OutputStream, ImageFormat.Gif);
Response.ContentType="image/gif";
}
catch ...{}
finally
...{
if (null !=objBitmap)
objBitmap.Dispose();
if (null !=g)
g.Dispose();
}
}
/// <summary>
/// 绘画背景颜色
/// </summary>
/// <param name="g"></param>
private void Paint_Background(Graphics g)
...{
g.Clear(BackColor);
}
/// <summary>
/// 绘画边框
/// </summary>
/// <param name="g"></param>
private void Paint_Border(Graphics g)
...{
g.DrawRectangle(BorderColor, 0, 0, Width - 1, Height - 1);
}
/// <summary>
/// 绘画文字
/// </summary>
/// <param name="g"></param>
private void Paint_Text(Graphics g)
...{
g.DrawString(_code, GetFont(), GetBrush(), 3, 1);
}
/// <summary>
/// 绘画文字噪音点
/// </summary>
/// <param name="g"></param>
private void Paint_TextStain(Bitmap b)
...{
for (int n=0; n<30; n++)
...{
int x=_random.Next(Width);
int y=_random.Next(Height);
b.SetPixel(x, y, Color.FromName(BrushName[_brushNameIndex]));
}
}
}

关于asp.net 验证码生成和刷新及验证的用户互动如下：

　　相关问题：

　　答： >>详细

　　相关问题：

　　答： >>详细

　　相关问题：

　　答： >>详细