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最近在做系统的时候，希望登录的时候要有登录验证，也就是验证码的功能，把实现贴出来，大家共享，共有两种方法。
第一种是：可以产生图片的图片验证码
1、类库文件
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web.UI.WebControls;
using System.ComponentModel;
using System.Web.UI;
namespace AuthCode
{
[Description("图形验证码控件"),
ToolboxData("<{0}:ImageAuthCode runat=server>
</{0}:ImageAuthCode>")]
public class ImageAuthCode:Image
{
[Description("图形验证码产生网页地址"), DefaultValue("")]
public string ValidateCodeUrl { get; set; }
protected override void Render(HtmlTextWriter writer)
{
string sUrl, sScript;
sUrl = this.ValidateCodeUrl;
if (string.IsNullOrEmpty(sUrl))
{
sUrl = "~/AuthCode.ashx";
}
if (this.BorderWidth == Unit.Empty)
{
this.BorderWidth = Unit.Pixel(1);
}
if (this.AlternateText == string.Empty)
{
this.AlternateText = "图形验证码";
}
this.ToolTip = "鼠标单击可以产生新的验证码";
this.ImageUrl = sUrl;
if (!this.DesignMode)
{
sScript = String.Format("this.src='{0}?
flag='+Math.random();",
this.Page.ResolveClientUrl(sUrl));
this.Attributes["onclick"] = sScript;
}
this.Style[HtmlTextWriterStyle.Cursor] = "pointer";
base.Render(writer);
}
public bool ValidateCode(string Code)
{
if (this.Page.Session["CheckCode"] == null)
return false;
if (this.Page.Session["CheckCode"].ToString() == Code)
{
return true;
}
else
{
return false;
}
}
}
} |
2、ashx文件如下
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Drawing;
using System.Web.SessionState;
namespace MyAuthCode
{
/// <summary>
/// Summary description for AuthCode
/// </summary>
public class AuthCode : IHttpHandler, IRequiresSessionState
{
private void CreateCheckCodeImage(string checkCode)
{
if (checkCode == null || checkCode.Trim() == String.Empty)
return;
System.Drawing.Bitmap image = new System.Drawing.Bitmap
((int)Math.Ceiling((checkCode.Length * 12.5)), 22);
Graphics g = Graphics.FromImage(image);
try
{
//生成随机生成器
Random random = new Random();
//清空图片背景色
g.Clear(Color.White);
//画图片的背景噪音线
for (int i = 0; i < 25; i++)
{
int x1 = random.Next(image.Width);
int x2 = random.Next(image.Width);
int y1 = random.Next(image.Height);
int y2 = random.Next(image.Height);
g.DrawLine(new Pen(Color.Silver),
x1, y1, x2, y2);
}
Font font = new
System.Drawing.Font("Verdana", 12,
(System.Drawing.FontStyle.Bold |
System.Drawing.FontStyle.Italic));
System.Drawing.Drawing2D.
LinearGradientBrush brush =
new System.Drawing.Drawing2D.
LinearGradientBrush
(new Rectangle(0, 0, image.Width,
image.Height), Color.Blue,
Color.DarkRed, 1.2f, true);
g.DrawString(checkCode, font, brush, 2, 2);
//画图片的前景噪音点
for (int i = 0; i < 100; i++)
{
int x = random.Next(image.Width);
int y = random.Next(image.Height);
image.SetPixel(x, y, Color.FromArgb(random.Next()));
}
//画图片的边框线
g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);
System.IO.MemoryStream ms = new System.IO.MemoryStream();
image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
HttpContext.Current.Response.ClearContent();
HttpContext.Current.Response.ContentType = "image/Gif";
HttpContext.Current.Response.BinaryWrite(ms.ToArray());
}
finally
{
g.Dispose();
image.Dispose();
}
}
private string GenerateCheckCode()
{
int number;
char code;
string checkCode = String.Empty;
System.Random random = new Random();
for (int i = 0; i < 5; i++)
{
number = random.Next();
if (number % 2 == 0)
code = (char)('0' + (char)(number % 10));
else
code = (char)('A' + (char)(number % 26));
checkCode += code.ToString();
}
HttpContext.Current.Session.Add("CheckCode", checkCode.Trim().ToLower());
//将 checkCode 写入 Session 中
return checkCode;
}
public void ProcessRequest(HttpContext context)
{
this.CreateCheckCodeImage(GenerateCheckCode());
}
public bool IsReusable
{
get
{
return false;
}
}
}
} |
3、增加工具箱和拖到页面使用
<%@ Register assembly="AuthCode" namespace="AuthCode" tagprefix="cc1" %>
<cc1:ImageAuthCode ID="ImageAuthCode1" runat="server" Height="20px" Width="100px"/> |
4、验证方法
ImageAuthCode1.ValidateCode(TextBox1.Text.Trim().ToString()) 结果返回true或者false. |
5、最重要的一点修改Web.Config配置文件
<location path="AuthCode.ashx">
<system.web>
<authorization>
<allow users="*"/>
</authorization>
</system.web>
</location> |
如果不增加此段代码，当你的时，图片验证码是无法显示的，因为它没有权限。第二种方法就不需要增加此段代码。
第二种是：比较简单，生成的不是图片，是span和文字版的验证码
1、类库文件
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web.UI;
using System.ComponentModel;
using System.Web.UI.WebControls;
using System.Drawing;
using System.Web;
using System.IO;
namespace MyControls
{
[ParseChildren(false)]
[DefaultProperty("Text")]
[ToolboxData("<{0}:ValidateControl runat=server></{0}:ValidateControl>")]
public class ValidateControl : WebControl
{
public ValidateControl() : base(HtmlTextWriterTag.Img)
{ }
#region 属性
[Category("Appearance"),
PersistenceMode(PersistenceMode.InnerDefaultProperty),
Bindable(true), DefaultValue("GBK5"),
Localizable(true), Description("Label_Text")]
public virtual string Text
{
get
{
String s = (String)ViewState["Text"];
return ((s == null) ? "GK4W" : s);
}
set
{
ViewState["Text"] = value;
}
}
[BrowsableAttribute(true)]
[DescriptionAttribute("背景图片")]
[CategoryAttribute("Appearance")]
public virtual String ImageUrl
{
get { return ViewState["ImageUrl"] != null ? (string)ViewState["ImageUrl"] : ""; }
set { ViewState["ImageUrl"] = value; }
}
[BrowsableAttribute(true)]
[DescriptionAttribute("数据位数")]
[CategoryAttribute("Appearance")]
public virtual int Step
{
get { return ViewState["Step"] != null ? (int)ViewState["Step"] : 4; }
set { ViewState["Step"] = value; }
}
[BrowsableAttribute(true)]
[DescriptionAttribute("文本位置")]
[CategoryAttribute("Appearance")]
public virtual TextAlign TextAlign
{
get { return ViewState["TextAlign"] != null ?
(TextAlign)ViewState["TextAlign"] :
DX.GO.Portal.Web.Controls.TextAlign.center; }
set { ViewState["TextAlign"] = value; }
}
protected override HtmlTextWriterTag TagKey
{
get
{
return HtmlTextWriterTag.Span;
}
}
#endregion
#region 初始化
protected override void OnLoad(EventArgs e)
{
Text = GenerateCheckCode(Step);
//CreateCheckCodeImage(Text);
base.OnLoad(e);
}
#endregion
#region 内部方法
/// <summary>
/// 产生随机字符串
/// </summary>
/// <param name="num">int</param>
/// <returns>string</returns>
private string GenerateCheckCode(int num)
{
#region
//string[] source ={"0","1","2","3","4","5","6","7","8","9",
// "A","B","C","D","E","F","G","H","I","J","K","L","M","N",
// "O","P","Q","R","S","T","U","V","W","X","Y","Z"};
//string code = "";
//Random rd = new Random();
//for (int i = 0; i < num; i++)
//{
// code += source[rd.Next(0, source.Length)];
//}
//return code;
#endregion
int number;
char code;
string checkCode = String.Empty;
Random random = new Random();
for (int i = 0; i < num; i++)
{
number = random.Next();
if (number % 2 == 0)
code = (char)('0' + (char)(number % 10));
else
code = (char)('A' + (char)(number % 26));
checkCode += code.ToString();
}
return checkCode;
}
/// <summary>
/// 生成图片
/// </summary>
/// <param name="checkCode">string</param>
private void CreateCheckCodeImage(string checkCode)
{
if (checkCode == null || checkCode.Trim() == String.Empty)
return;
//Bitmap image = new Bitmap((int)Math.Ceiling((checkCode.Length * 12.5)), 22);
Bitmap image = new Bitmap((int)this.Width.Value,(int)this.Height.Value);
Graphics g = Graphics.FromImage(image);
try
{
//生成随机生成器
Random random = new Random();
//清空图片背景色
g.Clear(Color.White);
//画图片的背景噪音线
for (int i = 0; i < 25; i++)
{
int x1 = random.Next(image.Width);
int x2 = random.Next(image.Width);
int y1 = random.Next(image.Height);
int y2 = random.Next(image.Height);
g.DrawLine(new Pen(Color.GreenYellow), x1, y1, x2, y2);
}
Font font = new System.Drawing.
Font("Verdana", 12, (System.Drawing.FontStyle.Bold |
System.Drawing.FontStyle.Italic));
System.Drawing.Drawing2D.
LinearGradientBrush brush =
new System.Drawing.Drawing2D.LinearGradientBrush
(new Rectangle(0, 0, image.Width, image.Height),
Color.Blue, Color.DarkRed, 1.2f, true);
g.DrawString(checkCode, font, brush, 2, 2);
//画图片的前景噪音点
for (int i = 0; i < 80; i++)
{
int x = random.Next(image.Width);
int y = random.Next(image.Height);
image.SetPixel(x, y, Color.FromArgb(random.Next()));
}
//画图片的边框线
g.DrawRectangle(new Pen(Color.Red), 0, 0, image.Width - 1, image.Height - 1);
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());
System.Web.HttpContext.Current.Response.End();
}
finally
{
g.Dispose();
image.Dispose();
}
}
#endregion
#region 呈现
/// <summary>
/// 应用最外层标签的属性和样式属性
/// </summary>
/// <param name="writer"></param>
protected override void AddAttributesToRender(System.Web.UI.HtmlTextWriter writer)
{
writer.AddAttribute(HtmlTextWriterAttribute.Name, this.UniqueID);
writer.AddStyleAttribute(HtmlTextWriterStyle.Height, Convert.ToString(Height));
writer.AddStyleAttribute(HtmlTextWriterStyle.Width, Convert.ToString(Width));
writer.AddStyleAttribute(HtmlTextWriterStyle.BackgroundImage, ImageUrl);
writer.AddStyleAttribute(HtmlTextWriterStyle.TextAlign, Convert.ToString(TextAlign));
base.AddAttributesToRender(writer);
}
/// <summary>
/// 过滤
/// </summary>
/// <param name="obj"></param>
protected override void AddParsedSubObject(object obj)
{
//if (!(obj is LiteralControl))
// return;
//base.AddParsedSubObject(obj);
}
/// <summary>
/// 呈现最外层标签的内容
/// </summary>
/// <param name="output"></param>
protected override void RenderContents(HtmlTextWriter output)
{
output.Write(Text);
base.RenderContents(output);
}
#endregion
}
}
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace MyControls
{
public enum TextAlign
{
right, center, left
}
} |
2、生成文件，添加到工具箱，拖到页面就可以使用
<go:ValidateControl ID="ValidateControl1"
runat="server" BackColor="#CC3300"
BorderStyle="Solid" BorderWidth=
"1px" Font-Bold="True" Font-Italic="True"
Font-Names="Arial Black" Font-Size="Small" Step="5" Width="70px">
</go:ValidateControl> |
3、验证方法
string vcode = string.Empty;
protected void Page_Load(object sender, EventArgs e)
{
vcode = ((ValidateControl)this.Login.FindControl("ValidateControl1")).Text.ToLower();
}
protected void Login_Authenticate(object sender, AuthenticateEventArgs args)
{
string Codetext = ((TextBox)this.Login.FindControl("txtValidateCode")).Text.ToLower();
if (Codetext == null)
{
this.Login.FailureText = "验证码不能为空！";
args.Authenticated = false;
return;
}
if (vcode == Codetext)
{
AuthLogCount(mycount.LogCounts, args);
}
else
{
this.Login.FailureText = "验证码输入不正确！";
args.Authenticated = false;
return;
}
} |
好了，完了，就是这些了，可以直接使用。大家可以扩展。
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