using System;
using System.Collections;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.Xml.Linq;
using System.Drawing;
using System.Web.SessionState;
namespace MT
{
/// <summary>
/// $codebehindclassname$ 的摘要说明
/// </summary>
[WebService(Namespace =
"http://tempuri.org/")]
[WebServiceBinding(ConformsTo =
WsiProfiles.BasicProfile1_1)]
public class verCode : IHttpHandler, IRequiresSessionState
{
private Random RandomSeed =
new Random();
public void ProcessRequest(HttpContext context)
{
// 生成随机数 iIlLoO0
string strWord =
"23456789QWERTYUPASDFGHKXCVBNM";
string NumStr =
null;
for (
int i =
0; i <
5; i++
)
{
NumStr += strWord[RandomSeed.Next(
0, strWord.Length)];
}
//将验证码保存到session中
context.Session[
"vcode"] =
NumStr.ToLower();
CreateImages(context, NumStr);
}
#region 生成验证码图片
private void CreateImages(HttpContext context,
string checkCode)
{
int iwidth = (
int)(checkCode.Length *
13);
System.Drawing.Bitmap image =
new System.Drawing.Bitmap(iwidth,
22);
Graphics g =
Graphics.FromImage(image);
g.Clear(Color.White);
//定义颜色
Color[] c =
{ Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };
//定义字体
string[] font = {
"Verdana",
"Microsoft Sans Serif",
"Comic Sans MS",
"Arial",
"宋体" };
Random rand =
new Random();
//随机输出噪点
for (
int i =
0; i <
50; i++
)
{
int x =
rand.Next(image.Width);
int y =
rand.Next(image.Height);
g.DrawRectangle(new Pen(Color.LightGray,
0), x, y,
1,
1);
}
//输出不同字体和颜色的验证码字符
for (
int i =
0; i < checkCode.Length; i++
)
{
int cindex = rand.Next(
7);
int findex = rand.Next(
5);
Font f =
new System.Drawing.Font(font[findex],
10, System.Drawing.FontStyle.Bold);
Brush b =
new System.Drawing.SolidBrush(c[cindex]);
int ii =
4;
if ((i +
1) %
2 ==
0)
{
ii =
2;
}
g.DrawString(checkCode.Substring(i, 1), f, b,
2 + (i *
12), ii);
}
//画一个边框
g.DrawRectangle(
new Pen(ColorTranslator.FromHtml(
"#CCCCCC"),
0),
0,
0, image.Width -
1, image.Height -
1);
//输出到浏览器
System.IO.MemoryStream ms =
new System.IO.MemoryStream();
image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
context.Response.ClearContent();
//Response.ClearContent();
context.Response.ContentType =
"image/gif";
context.Response.BinaryWrite(ms.ToArray());
g.Dispose();
image.Dispose();
}
#endregion
public bool IsReusable
{
get
{
return false;
}
}
}
}
转载于:https://www.cnblogs.com/zoro-zero/p/4040926.html
相关资源：.NET使用一般处理程序生成验证码
