成果:
using System;
using System.Web;
using System.Drawing;
using System.Web.SessionState;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
public class ValidateCode : IHttpHandler, IRequiresSessionState {
public void ProcessRequest(HttpContext context)
{
int NumCount = 4;//預設產生5位亂數
if ("" == "" + context.Request.QueryString["NumCount"])
{//有指定產生幾位數//字串轉數字,轉型成功的話儲存到 NumCount,不成功的話,NumCount會是0
try
{
NumCount = Int32.Parse(context.Request.QueryString["NumCount"].Replace("'", "''"));
}
catch
{
NumCount = 0;
}
}
if (NumCount == 0) NumCount = 4;
//取得亂數
string str_ValidateCode = this.GetRandomNumberString(NumCount);
/*用於驗證的Session*/
context.Session["ValidateCode"] = str_ValidateCode;//取得圖片物件
System.Drawing.Image image = this.CreateCheckCodeImage(context, str_ValidateCode);
System.IO.MemoryStream ms = new System.IO.MemoryStream();
image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
/*輸出圖片*/
context.Response.Clear();
context.Response.ContentType = "image/jpeg";
context.Response.BinaryWrite(ms.ToArray());
ms.Close();}
#region 產生數字亂數
private string GetRandomNumberString(int int_NumberLength)
{
System.Text.StringBuilder str_Number = new System.Text.StringBuilder();//字串儲存器
Random rand = new Random(Guid.NewGuid().GetHashCode());//亂數物件for (int i = 1; i <= int_NumberLength; i++)
{
string c = "";
int j = rand.Next(0, 36);
if (j < 10)
c = j.ToString();
else c = ((char)(65 + j - 10)).ToString();
str_Number.Append(c);//產生0~9的亂數
}return str_Number.ToString();
}
#endregion#region 產生圖片
private System.Drawing.Image CreateCheckCodeImage(HttpContext context, string checkCode)
{System.Drawing.Bitmap image = new System.Drawing.Bitmap((checkCode.Length * 25) + 16, 40);
System.Drawing.Graphics g = Graphics.FromImage(image);
//生成隨機生成器
Random random = new Random(Guid.NewGuid().GetHashCode());
int int_Red = 0;
int int_Green = 0;
int int_Blue = 0;
int_Red = random.Next(240, 256);//產生0~255
int_Green = random.Next(240, 256);//產生0~255
int_Blue = (int_Red + int_Green > 400 ? 150 : 400 - int_Red - int_Green);
int_Blue = (int_Blue > 255 ? 255 : int_Blue);
int int_bkack = random.Next(150, 200);
//清空圖片背景色
g.Clear(Color.FromArgb(int_Red, int_Green, int_Blue));
int blackbg = random.Next(0, 130);
int garykbg = random.Next(130, 150);
Rectangle rect = new Rectangle(0, 0, image.Width, image.Height);
//Brush brushBack = new LinearGradientBrush(rect, Color.FromArgb(random.Next(0, 100), random.Next(230, 256), 255),
//Color.FromArgb(255, random.Next(200, 256), 255), random.Next(45));//新增黑白漸層
Brush brushBack = new LinearGradientBrush(rect, Color.FromArgb(int_bkack, int_bkack, int_bkack),
Color.FromArgb(255,255,255), 255);
g.FillRectangle(brushBack, rect);//畫圖片的背景噪音線
for (int i = 0; i <= 6; 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);
int b1 =random.Next(70,150);
int b2 = random.Next(40, 80);
//Color line1 = Color.FromArgb(random.Next(0, 100), random.Next(220, 255), random.Next(220, 255));
//Color line2 = Color.FromArgb(random.Next(0, 100), 255, random.Next(200, 240));Color line1 = Color.FromArgb(b1, b1, b1);
Color line2 = Color.FromArgb(b2, b2, b2);
g.DrawLine(new Pen(line1), x1, y1, x2, y2);g.DrawEllipse(new Pen(line2), new System.Drawing.Rectangle(x1, y1, x2, y2));
}for (int i = 0; i < checkCode.Length; i++)
{
int Cr=1, Cg=1, Cb=1;
while (Cr+Cg+Cb!=1)
{
Cr = random.Next(0, 2);
Cg = random.Next(0, 2);
Cb = random.Next(0, 2);
}
//增強對比
//while (Cr == Cg && Cg == Cb)
//{
// Cr = random.Next(0, 2);
// Cg = random.Next(0, 2);
// Cb = random.Next(0, 2);
//}
//字體顏色
Color wc = Color.FromArgb(Cr*255, Cg*130, Cb*255);
Color wc2 = Color.FromArgb(Cb* 255, Cr*130, Cg*255);
int y = random.Next(0, 6);
Font font = new System.Drawing.Font("Consolas", 19 + y, (System.Drawing.FontStyle.Bold));
System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), wc, wc2, 1.2F, true);
//設置繪筆
g.DrawString(checkCode.Substring(i, 1), font, brush, 8 + i * 25, 2 + random.Next(0, 6 - y));
}
for (int i = 0; i <= 25; i++)
{//畫圖片的前景噪音點
int x = random.Next(image.Width);
int y = random.Next(image.Height);image.SetPixel(x, y, Color.FromArgb(random.Next()));
}//畫圖片的邊框線
g.DrawRectangle(new Pen(Color.DarkGray,1), 0, 0, image.Width - 1, image.Height - 1);
return image;}
#endregion
public bool IsReusable {
get {
return false;
}
}}
前端加上
<img name="imgCode" src="ValidateCode.ashx" alt="驗證碼" style="FLOAT:left"> 顯示驗證碼 可以再用圖片配合js 作重新產生驗證碼圖片
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