C#代码
#region 验证码
#region 验证码Action
public ActionResult CreateValidateCode()
{
MemoryStream ms = new MemoryStream();
string checkCode = CreateCode(4);
CreateImage(checkCode, ms);
Session["ValidateCode"] = checkCode;
return File(ms.ToArray(), @"image/png");
}
#endregion
#region 产生验证码
/// <summary>
/// 产生验证码
/// </summary>
/// <param name="codeLength"></param>
/// <returns></returns>
public string CreateCode(int codeLength)
{
string so = "2,3,4,5,6,7,8,9,a,b,c,d,e,f,g,h,j,k,m,n,p,q,r,s,t,u,v,w,x,y,z,A,B,C,D,E,F,G,H,J,K,L,M,N,P,Q,R,S,T,U,V,W,X,Y,Z";
string[] strArr = so.Split(',');
string code = "";
Random rand = new Random();
for (int i = 0; i < codeLength; i++)
{
code += strArr[rand.Next(0, strArr.Length)];
}
return code;
}
#endregion
#region 产生验证图片
/// <summary>
/// 产生验证图片
/// </summary>
/// <param name="code"></param>
/// <param name="ms"></param>
public void CreateImage(string code, MemoryStream ms)
{
Bitmap image = new Bitmap(100, 40);
Graphics g = Graphics.FromImage(image);
WebColorConverter ww = new WebColorConverter();
//g.Clear((Color)ww.ConvertFromString("#FAE264"));
Random random = new Random();
// 画图片的背景噪音线
for (int i = 0; i < 12; 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.LightGray), x1, y1, x2, y2);
}
Font font = new Font("Arial", 22, FontStyle.Bold | FontStyle.Italic);
System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(
new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.Gray, 1.2f, true);
g.DrawString(code, font, brush, 0, 0);
// 画图片的前景噪音点
for (int i = 0; i < 10; i++)
{
int x = random.Next(image.Width);
int y = random.Next(image.Height);
image.SetPixel(x, y, Color.White);
}
// 画图片的边框线
g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);
image.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
g.Dispose();
image.Dispose();
}
#endregion
#endregion
HTML代码
<img id="valiCode" style="cursor: pointer;" src="/Home/CreateValidateCode" alt="验证码" />
<script type="text/javascript">
$(function () {
$("#valiCode").bind("click", function () {
this.src = "/Home/CreateValidateCode?time=" + (new Date()).getTime();
});
})
</script>