<%@ WebHandler Language="C#" Class="CheckCodeHandler" %>using System;
using System.Web;
using System.Text;
using System.Drawing;
using System.Web.SessionState;
public class CheckCodeHandler : IHttpHandler,IRequiresSessionState{
//产生验证码的字符集 public string charcode = "2,3,4,5,6,8,9,A,B,C,D,E,F,G,H,J,K,M,N,P,R,S,U,W,X,Y,a,b,c,d,e,f,g,h,j,k,m,n,p,r,s,u,w,x,y";
public void ProcessRequest (HttpContext context) {
string validateCode = CreateRandomCode(4);
context.Session["ValidateCode"] = validateCode;
//将验证码保存到session中 CreateCodeImage(validateCode, context);
}
public bool IsReusable {
get {
return false;
}
}
/// <summary> /// 生成验证码 /// </summary> /// <param name="n">验证码个数</param> /// <returns>验证码字符串</returns> public string CreateRandomCode(int n) {
string[] CharArray = charcode.Split(',');
//将字符串转换为字符数组 string randomCode = "";
int temp = -1;
Random rand = new Random();
for (int i = 0;
i < n;
i++) {
if (temp != -1) {
rand = new Random(i * temp * ((int)DateTime.Now.Ticks));
}
int t = rand.Next(CharArray.Length - 1);
if (temp != -1 && temp == t) {
return CreateRandomCode(n);
}
temp = t;
randomCode += CharArray[t];
}
return randomCode;
}
public void CreateCodeImage(string checkCode, HttpContext context) {
int iwidth = (int)(checkCode.Length * 13);
System.Drawing.Bitmap image = new System.Drawing.Bitmap(iwidth, 20);
Graphics g = Graphics.FromImage(image);
Font f = new System.Drawing.Font("Arial", 12, (System.Drawing.FontStyle.Italic | System.Drawing.FontStyle.Bold));
// 前景色 Brush b = new System.Drawing.SolidBrush(Color.Black);
// 背景色 g.Clear(Color.White);
// 填充文字 g.DrawString(checkCode, f, b, 0, 1);
// 随机线条 Pen linePen = new Pen(Color.Gray, 0);
Random rand = new Random();
for (int i = 0;
i < 5;
i++) {
int x1 = rand.Next(image.Width);
int y1 = rand.Next(image.Height);
int x2 = rand.Next(image.Width);
int y2 = rand.Next(image.Height);
g.DrawLine(linePen, x1, y1, x2, y2);
}
// 随机点 for (int i = 0;
i < 30;
i++) {
int x = rand.Next(image.Width);
int y = rand.Next(image.Height);
image.SetPixel(x, y, Color.Gray);
}
// 边框 g.DrawRectangle(new Pen(Color.Gray), 0, 0, image.Width - 1, image.Height - 1);
// 输出图片 System.IO.MemoryStream ms = new System.IO.MemoryStream();
image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
context.Response.ClearContent();
context.Response.ContentType = "image/jpeg";
context.Response.BinaryWrite(ms.ToArray());
g.Dispose();
image.Dispose();
}
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Drawing;
using System.Web.UI;
using System.Drawing.Drawing2D;
using System.IO;
using System.Drawing.Imaging;
/// <summary>///ValidateNumber 生成验证码/// </summary>public class ValidateNumber{
//产生验证码的字符集 （易混淆的字符去掉） private string charcode = "2,3,4,5,6,8,9,A,B,C,D,E,F,G,H,J,K,M,N,P,R,S,U,W,X,Y,a,b,c,d,e,f,g,h,j,k,m,n,p,r,s,u,w,x,y";
/// <summary> /// 验证码的最大长度 /// </summary> public int MaxLength {
get {
return 10;
}
}
/// <summary> /// 验证码的最小长度 /// </summary> public int MinLength {
get {
return 1;
}
}
/// <summary> /// 生成验证码 /// </summary> /// <param name="length">指定验证码的长度</param> /// <returns></returns> public string CreateValidateNumber(int length) {
string[] CharArray = charcode.Split(',');
//将字符串转换为字符数组 string randomCode = "";
int temp = -1;
Random rand = new Random();
for (int i = 0;
i < length;
i++) {
if (temp != -1) {
rand = new Random(i * temp * ((int)DateTime.Now.Ticks));
}
int t = rand.Next(CharArray.Length - 1);
if (temp != -1 && temp == t) {
return CreateValidateNumber(length);
}
temp = t;
randomCode += CharArray[t];
}
return randomCode;
}
/// <summary> /// 创建验证码的图片 /// </summary> /// <param name="context">context对象</param> /// <param name="validateNum">验证码</param> public void CreateValidateGraphic(HttpContext context,string validateNum) {
int iwidth = (int)(validateNum.Length * 14);
Bitmap image = new Bitmap(iwidth, 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);
//画图片的干扰线 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 Font("Arial", 12, (FontStyle.Bold | FontStyle.Italic));
LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true);
g.DrawString(validateNum, font, brush, 3, 2);
//画图片的前景干扰点 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);
//保存图片数据 MemoryStream stream = new MemoryStream();
image.Save(stream, ImageFormat.Jpeg);
//输出图片 context.Response.Clear();
context.Response.ContentType = "image/jpeg";
context.Response.BinaryWrite(stream.ToArray());
}
finally {
g.Dispose();
image.Dispose();
}
}
/// <summary> /// 得到验证码图片的长度 /// </summary> /// <param name="validateNumLength">验证码的长度</param> /// <returns></returns> public static int GetImageWidth(int validateNumLength) {
return (int)(validateNumLength * 14);
}
/// <summary> /// 得到验证码图片的高度 /// </summary> /// <returns></returns> public static double GetImageHeight() {
return 22;
}
}