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2011-02-19 21:49
CodeNote
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感谢 Asp.Net技术前瞻--张明Blog
原文地址:http://www.cnblogs.com/zm235/archive/2008/04/29/1175891.html 一、效果如下: ![](https://images.cnblogs.com/cnblogs_com/zm235/test.jpg) 二、项目中添加一个类命名为(可任选)在此类中添加代码
using System;
using System.Web;
using System.IO;
using System.Drawing;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif) /**//// <summary>
/// Class1 的摘要说明
/// </summary> public class zhangming
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif) ![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif) {
public class VerifyCode
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) {
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif) 验证码长度(默认5个验证码的长度)#region 验证码长度(默认5个验证码的长度)
int length = 5;
public int Length
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) {
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) get { return length; }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) set { length = value; }
}
#endregion
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif) 验证码字体大小(默认10像素)#region 验证码字体大小(默认10像素)
int fontSize = 10;
public int FontSize
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) {
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) get { return fontSize; }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) set { fontSize = value; }
}
#endregion
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif) 边框补(默认1像素)#region 边框补(默认1像素)
int padding = 1;
public int Padding
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) {
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) get { return padding; }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) set { padding = value; }
}
#endregion
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif) 是否输出燥点(默认不输出)#region 是否输出燥点(默认不输出)
bool chaos = true;
public bool Chaos
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) {
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) get { return chaos; }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) set { chaos = value; }
}
#endregion
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif) 输出燥点的颜色(默认灰色)#region 输出燥点的颜色(默认灰色)
Color chaosColor = Color.LightGray;
public Color ChaosColor
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) {
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) get { return chaosColor; }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) set { chaosColor = value; }
}
#endregion
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif) 自定义背景色(默认白色)#region 自定义背景色(默认白色)
Color backgroundColor = Color.White;
public Color BackgroundColor
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) {
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) get { return backgroundColor; }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) set { backgroundColor = value; }
}
#endregion
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif) 自定义随机颜色数组#region 自定义随机颜色数组
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) Color[] colors = {Color.Black,Color.Red,Color.DarkBlue,Color.Green,Color.Orange,Color.Brown,Color.DarkCyan,Color.Purple};
public Color[] Colors
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) {
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) get { return colors; }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) set { colors = value; }
}
#endregion
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif) 自定义字体数组#region 自定义字体数组
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) string[] fonts = {"Arial", "Georgia"};
public string[] Fonts
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) {
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) get { return fonts; }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) set { fonts = value; }
}
#endregion
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif) 自定义随机码字符串序列(使用逗号分隔)#region 自定义随机码字符串序列(使用逗号分隔)
string codeSerial = "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,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";
public string CodeSerial
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) {
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) get { return codeSerial; }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) set { codeSerial = value; }
}
#endregion
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif) 生成校验码图片#region 生成校验码图片
public Bitmap CreateImageCode(string code)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) {
int fSize = FontSize;
int fWidth = fSize + Padding;
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
int imageWidth = (int)(code.Length * fWidth) + 4 + Padding * 2;
int imageHeight = fSize *2 + Padding;
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
System.Drawing.Bitmap image = new System.Drawing.Bitmap(imageWidth, imageHeight);
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
Graphics g = Graphics.FromImage(image);
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
g.Clear(BackgroundColor);
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
Random rand = new Random();
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//给背景添加随机生成的燥点
if(this.Chaos)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) {
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
Pen pen = new Pen(ChaosColor, 0);
int c = Length * 10;
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
for(int i=0;i<c;i++)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) {
int x = rand.Next(image.Width);
int y = rand.Next(image.Height);
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
g.DrawRectangle(pen, x, y, 1, 1);
}
}
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
int left = 0 , top = 0, top1 = 1, top2 = 1;
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
int n1 = (imageHeight - FontSize - Padding * 2);
int n2 = n1/4;
top1 = n2;
top2 = n2 *2;
Font f;
Brush b;
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
int cindex, findex;
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//随机字体和颜色的验证码字符
for(int i=0; i<code.Length; i++)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) {
cindex = rand.Next(Colors.Length - 1);
findex = rand.Next(Fonts.Length - 1);
f = new System.Drawing.Font(Fonts[findex], fSize, System.Drawing.FontStyle.Bold);
b = new System.Drawing.SolidBrush(Colors[cindex]);
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
if( i%2 == 1 )
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) {
top = top2;
}
else
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) {
top = top1;
}
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
left = i * fWidth;
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
g.DrawString(code.Substring(i,1), f, b, left, top);
}
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//画一个边框 边框颜色为Color.Gainsboro
g.DrawRectangle(new Pen(Color.Gainsboro, 0), 0, 0, image.Width - 1, image.Height - 1);
g.Dispose();
return image;
}
#endregion
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif) 将创建好的图片输出到页面#region 将创建好的图片输出到页面
public void CreateImageOnPage(string code, HttpContext context)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) {
System.IO.MemoryStream ms = new System.IO.MemoryStream();
Bitmap image = this.CreateImageCode(code);
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
context.Response.ClearContent();
context.Response.ContentType = "image/Jpeg";
context.Response.BinaryWrite(ms.GetBuffer());
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
ms.Close();
ms = null;
image.Dispose();
image = null;
}
#endregion
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif) 生成随机字符码#region 生成随机字符码
public string CreateVerifyCode(int codeLen)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) {
if(codeLen == 0)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) {
codeLen = Length;
}
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
string[] arr = CodeSerial.Split(',');
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
string code = "";
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
int randValue = -1;
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
Random rand = new Random(unchecked((int)DateTime.Now.Ticks));
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
for(int i=0; i<codeLen; i++)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) {
randValue = rand.Next(0, arr.Length -1);
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
code += arr[randValue];
}
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
return code;
}
public string CreateVerifyCode()
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) {
return CreateVerifyCode(0);
}
#endregion
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
}
}
三、新建GetImageCode.aspx页面前台添加代码(实际前台代码无内容)
<body>
<form id="form1" runat="server">
<div>
</div>
</form>
</body>
四、添加GetImageCode.aspx.cs后台代码
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 System.IO;
using System.Drawing;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
public partial class Default4 : System.Web.UI.Page
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif) ![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif) {
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif) 验证码长度(默认5个验证码的长度)#region 验证码长度(默认5个验证码的长度)
int length = 5;
#endregion
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif) 验证码字体大小(默认10像素)#region 验证码字体大小(默认10像素)
int fontSize = 10;
#endregion
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif) 边框补(默认1像素)#region 边框补(默认1像素)
int padding = 1;
#endregion
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif) 是否输出燥点(默认输出)#region 是否输出燥点(默认输出)
bool chaos = true;
#endregion
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif) 输出燥点的颜色(默认灰色)#region 输出燥点的颜色(默认灰色)
Color chaosColor = System.Drawing.Color.Pink;
#endregion
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif) 自定义背景色(默认白色)#region 自定义背景色(默认白色)
Color backgroundColor = Color.White;
#endregion
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif) 自定义随机颜色数组#region 自定义随机颜色数组
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) Color[] colors = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };
#endregion
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif) 自定义字体数组#region 自定义字体数组
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) string[] fonts = { "Arial", "Georgia" };
#endregion
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlock.gif) 自定义随机码字符串序列(使用逗号分隔)#region 自定义随机码字符串序列(使用逗号分隔)
string codeSerial = "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";
#endregion
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
protected void Page_Load(object sender, EventArgs e)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) {
zhangming.VerifyCode v = new zhangming.VerifyCode();
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
v.Length = this.length;
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
v.FontSize = this.fontSize;
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
v.Chaos = this.chaos;
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
v.BackgroundColor = this.backgroundColor;
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
v.ChaosColor = this.chaosColor;
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
v.CodeSerial = this.codeSerial;
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
v.Colors = this.colors;
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
v.Fonts = this.fonts;
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
v.Padding = this.padding;
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
string code = v.CreateVerifyCode(); //取随机码
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
v.CreateImageOnPage(code, this.Context); // 输出图片
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
//Session["CheckCode"] = code.ToLower(); // 使用Session["CheckCode"]取验证码的值
Response.Cookies.Add(new HttpCookie("CheckCode", code.ToLower()));// 使用Cookies取验证码的值
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
}
}
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
五、验证码的使用(在Test.aspx页面加入<asp:Image id="Image1" runat="server" ImageUrl="~/GetVerifyCode.aspx"></asp:Image>)即实现验证码
<form id="form1" runat="server">
<div>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:Image id="Image1" runat="server" ImageUrl="GetImageCode.aspx"></asp:Image>
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click"
Text="Button" />
<br />
<asp:Label ID="Label1" runat="server"></asp:Label></div>
</form>
六、Test.aspx.cs后台代码
protected void Page_Load(object sender, EventArgs e)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif) {
if (!Page.IsPostBack)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) {
//Session["CheckCode"] = "";
Response.Cookies.Add(new HttpCookie("CheckCode", ""));
}
}
protected void Button1_Click(object sender, EventArgs e)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif) {
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
if (Request.Cookies["CheckCode"] == null)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) {
Label1.Text = "您的浏览器设置已被禁用 Cookies,您必须设置浏览器允许使用 Cookies 选项后才能使用本系统。";
Label1.Visible = true;
return;
}
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
if (String.Compare(Request.Cookies["CheckCode"].Value, TextBox1.Text.ToString().Trim(), true) != 0)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) {
Label1.Text = "验证码错误,请输入正确的验证码。";
Label1.Visible = true;
return;
}
else
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif) {
Label1.Text = "验证码OK。";
Label1.Visible = true;
}
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
}
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