public byte[] GetVerifyCode()
{
int codeW = 80;
int codeH = 30;
int fontSize = 16;
string chkCode = string.Empty;
//颜色列表，用于验证码、噪线、噪点
Color[] color = { Color.Black, Color.Red, Color.Blue, Color.Green, Color.Orange, Color.Brown, Color.Brown, Color.DarkBlue };
//字体列表，用于验证码
string[] font = { "Times New Roman" };
//验证码的字符集，去掉了一些容易混淆的字符
char[] character = { '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'd', 'e', 'f', 'h', 'k', 'm', 'n', 'r', 'x', 'y', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'K', 'L', 'M', 'N', 'P', 'R', 'S', 'T', 'W', 'X', 'Y' };
Random rnd = new Random();
//生成验证码字符串
for (int i = 0; i < 4; i++)
{
chkCode += character[rnd.Next(character.Length)];
}
//写入Session、验证码加密
WebHelper.WriteSession("Athena_session_verifycode", Md5.md5(chkCode.ToLower(), 16));
//创建画布
Bitmap bmp = new Bitmap(codeW, codeH);
Graphics g = Graphics.FromImage(bmp);
g.Clear(Color.White);
//画噪线
for (int i = 0; i < 3; i++)
{
int x1 = rnd.Next(codeW);
int y1 = rnd.Next(codeH);
int x2 = rnd.Next(codeW);
int y2 = rnd.Next(codeH);
Color clr = color[rnd.Next(color.Length)];
g.DrawLine(new Pen(clr), x1, y1, x2, y2);
}
//画验证码字符串
for (int i = 0; i < chkCode.Length; i++)
{
string fnt = font[rnd.Next(font.Length)];
Font ft = new Font(fnt, fontSize);
Color clr = color[rnd.Next(color.Length)];
g.DrawString(chkCode[i].ToString(), ft, new SolidBrush(clr), (float)i * 18, (float)0);
}
//将验证码图片写入内存流，并将其以 "image/Png" 格式输出
MemoryStream ms = new MemoryStream();
try
{
bmp.Save(ms, ImageFormat.Png);
return(ms.ToArray());
}
catch (Exception)
{
return(null);
}
finally
{
g.Dispose();
bmp.Dispose();
}
}
public void CheckLogin()
{
string msg = string.Empty;
//检查记录登录次数
if ((this.ctx.Session["PassErrorCount"] != null) && (this.ctx.Session["PassErrorCount"].ToString() != ""))
{
//获取错误登入次数
int PassErroeCount = Convert.ToInt32(this.ctx.Session["PassErrorCount"]);
if (PassErroeCount > 3)
{
msg = "登录尝试错误次数超过3次";
this.Content(msg);
WriteBackHtml(msg, false);
return;
}
}
/// 检查验证码
if ((this.ctx.Request["code"] != null) && (this.ctx.Request["code"].ToString() != ""))
{
if (Md5.md5(ctx.Request["code"].ToString().ToLower(), 16).ToString().ToLower() != this.ctx.Session["Athena_session_verifycode"].ToString().ToLower())
{
msg = "验证码填写错误 !";
WriteBackHtml(msg, false);
return;
}
}
string userName = this.ctx.Request["username"];
string passWord = this.ctx.Request["password"];
AccountsPrincipal accctx = AccountsPrincipal.ValidateLogin(userName, passWord);
string loginpattern = ConfigurationManager.AppSettings["LoginPattern"];
LoginFactory loginfactory = new LoginFactory();
Login lo = loginfactory.GetLoginType(loginpattern);
if (lo.IsLoginPatternMessageExist())
{
this.ctx.User = accctx;
this.ctx.Session["accctx"] = accctx;
lo.ClearLoginPattern();
msg = "登录成功，页面跳转中!";
WriteBackHtml(msg, true);//在页面上可以以红字提醒，JS直接direct跳转到下一个链接
}
else
{
if (accctx == null)//登录信息不对
{
msg = "登陆失败： " + userName;
if ((this.ctx.Session["PassErrorCount"] != null) && (this.ctx.Session["PassErrorCount"].ToString() != ""))
{
int PassErroeCount = Convert.ToInt32(this.ctx.Session["PassErrorCount"]);
this.ctx.Session["PassErrorCount"] = PassErroeCount + 1;
}
else
{
this.ctx.Session["PassErrorCount"] = 1;
}
}
else
{
lo.SetLoginPatternMessage(userName, passWord);
//把当前用户对象实例赋给Context.User，这样做将会把完整的用户信息加载到ASP.NET提供的验证体系中
this.ctx.User = accctx;
this.ctx.Session["accctx"] = accctx;
msg = "登录成功，页面跳转中!";
WriteBackHtml(msg, true);//在页面上可以以红字提醒，JS直接direct跳转到下一个链接
}
}
}