C#..
/*反射工厂关键代码*/namespace GameCardSale.DALFactory{ /// <summary> /// 提供数据访问实体的工厂 /// </summary> public sealed class DataAccess { //数据集名称 private static readonly string dalFile =ConfigurationManager.AppSettings["WebDAL"]; //命名空间 private static readonly string nameSpace = ConfigurationManager.AppSettings["NameSpace"]; #region UserInfoService /// <summary> /// 获取对 UserInfo 表的数据访问实体 /// </summary> /// <returns></returns> public static GameCardSale.IDAL.IUserInfoService CreateUserInfoService() { return Assembly.Load(dalFile).CreateInstance(nameSpace + ".UserInfoService") as IUserInfoService; } #endregion }}
/*Csharp 验证码*/
public class ValidateCode : System.Web.UI.Page {private void Page_Load(object sender, System.EventArgs e){ this.CreateCheckCodeImage(GenerateCheckCode());}#region Web 窗体设计器生成的代码override protected void OnInit(EventArgs e){ // // CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。 // InitializeComponent(); base.OnInit(e);} /// <summary>/// 设计器支持所需的方法 - 不要使用代码编辑器修改/// 此方法的内容。/// </summary>private void InitializeComponent(){ this.Load += new System.EventHandler(this.Page_Load);}#endregionprivate 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(); } Response.Cookies.Add(new HttpCookie("CheckCode", checkCode)); return checkCode;}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("Arial", 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); Response.ClearContent(); Response.ContentType = "image/Gif"; Response.BinaryWrite(ms.ToArray()); } finally { g.Dispose(); image.Dispose(); }} }
假如以上验证码生成器页面名为：CheckCode.aspx，那么在登录页面中使用“<IMG>” 这个 HTML 元素来显示生成的验证码图片：<IMG src="CheckCode.aspx">
在登录页面的登录按钮的处理事件中使用以下代码判断验证码：
private void btnLogin_Click(object sender, System.Web.UI.ImageClickEventArgs e)
{
if(Request.Cookies["CheckCode"] == null)
{
lblMessage.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。";
lblMessage.Visible = true;
return;
}
if(String.Compare(Request.Cookies["CheckCode"].Value, txtCheckCode.Text, true) != 0)
{
lblMessage.Text = "验证码错误，请输入正确的验证码。";
lblMessage.Visible = true;
return;
}
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设置网页过期:
<!--禁用缓存部分开始--> <meta http-equiv="Expires" content="0" /> <meta http-equiv="Progma" content="no-cache" /> <meta http-equiv="cache-control" content="no-cache,must-revalidate" /> <!--禁用缓存部分结束--> ASP.net 代码如下： 放在页面代码Page_Onload HttpContext.Current.Response.Expires = 0; Response.ExpiresAbsolute = DateTime.Now - 1; Response.AddHeader("progma", "no-cache"); Response.AddHeader("cache-control", "private"); Response.CacheControl = "no-cache"; PHP网页 header("Expires: Mon, 26 Jul 1997 05:00:00 GMT"); header("Cache-Control: no-cache, must-revalidate"); header("Pragma: no-cache");-----------
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