一般处理程序 验证码
public class 验é证¤码? : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "image/JPEG";
using (System.Drawing.Bitmap bitmap = new System.Drawing.Bitmap(200, 50))
{
using (System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap))
{
g.DrawString("十ê?一ò?月?的μ?柳á?叶ò?",new System.Drawing.Font("宋?体ì?", 20), System.Drawing.Brushes.Green,new System.Drawing.PointF(0, 0));
g.DrawEllipse(System.Drawing.Pens.Red, new System.Drawing.Rectangle(10, 10, 10, 10));
g.DrawEllipse(System.Drawing.Pens.Red, new System.Drawing.Rectangle(20, 20, 10, 10));
bitmap.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);
}
}
}随机验证码
Random rand = new Random();
int code = rand.Next();
string strcode = Convert.ToString(code);
g.DrawString(strcode, new System.Drawing.Font("宋?体ì?", 30), System.Drawing.Brushes.Green, new System.Drawing.PointF(0, 0));
bitmap.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg); 完整验证码示例：
一般处理程序public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "image/JPEG";
using (System.Drawing.Bitmap bitmap = new System.Drawing.Bitmap(200, 50))
{
using (System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap))
{
//g.DrawString("十ê?一ò?月?的μ?柳á?叶ò?",new System.Drawing.Font("宋?体ì?", 20), System.Drawing.Brushes.Green,new System.Drawing.PointF(0, 0));
//g.DrawEllipse(System.Drawing.Pens.Red, new System.Drawing.Rectangle(10, 10, 10, 10));
//g.DrawEllipse(System.Drawing.Pens.Red, new System.Drawing.Rectangle(20, 20, 10, 10));
//bitmap.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);
Random rand = new Random();
int code = rand.Next();
string strcode = Convert.ToString(code);
HttpContext.Current.Session["code"] = strcode;//session需Dè要òa通í¨过1yhttpcontext实êμ现?接ó口ú
g.DrawString(strcode, new System.Drawing.Font("宋?体ì?", 30), System.Drawing.Brushes.Green, new System.Drawing.PointF(0, 0));
bitmap.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);
}
}前台<form id="form1" runat="server">
<div>
<input type="image" src="验é证¤码?.ashx" />
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:Button ID="Button1" runat="server" Text="Button"
onclick="Button1_Click" />
</div>
</form>后台protected void Button1_Click(object sender, EventArgs e)
{
string strcode = Session["code"].ToString();
if (strcode==TextBox1.Text)
{
Response.Write("正y确è·");
}
else
{
Response.Write("错′í误ó");
}
}刷新验证码 <input type="image" src="验é证¤码?.ashx" onclick="this.src='验证码.ashx?aaa='+new date()"/>