一般处理程序 —— GDI
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace _2_9_输出一幅动态创建的图片
{
class Program
{
//GDI:.Net程序中进行绘图的一些类
static void Main(string[] args)
{
using (Bitmap bmp = new Bitmap(500, 500))//创建一个尺寸为500*500的内存图片
using (Graphics g = Graphics.FromImage(bmp))//得到图片的画布
{
g.DrawString("动态创建的图片", new Font(FontFamily.GenericSerif, 30), Brushes.Red, 100, 100);//Font应该被释放
g.DrawEllipse(Pens.Blue, 100, 100, 100, 100);
//bmp.Save(@"一幅动态创建的图片.jpg", ImageFormat.Jpeg);//图片保存到输出流
using (Stream stream = File.OpenWrite(@"一幅动态创建的图片.jpg"))
{
bmp.Save(stream, ImageFormat.Jpeg);
}
}
}
}
}
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.Linq;
using System.Web;
namespace _2_一般处理程序
{
/// <summary>
/// 泡妞证 的摘要说明
/// </summary>
public class 泡妞证 : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "image/jpeg";
string name = context.Request["Name"];
string imgFullPath = context.Server.MapPath("~/PaoNiuZheng.jpg");
using (Image bmp = Bitmap.FromFile(imgFullPath))//读取一张已有的图片
using (Graphics g = Graphics.FromImage(bmp))//得到图片的画布
using (Font font1 = new Font(FontFamily.GenericSerif, 12))
using (Font font2 = new Font(FontFamily.GenericSerif, 5))
{
{
g.DrawString(name, font1, Brushes.Black, 125, 220);//Font应该被释放
g.DrawString(name, font2, Brushes.Black, 310, 50);//Font应该被释放
bmp.Save(context.Response.OutputStream, ImageFormat.Jpeg);//图片保存到输出流
}
}
}
public bool IsReusable
{
get
{
return false;
}
}
}
}
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.Linq;
using System.Web;
namespace _2_一般处理程序
{
/// <summary>
/// 输出一幅动态创建的图片 的摘要说明
/// </summary>
public class 输出一幅动态创建的图片 : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "image/jpeg";
string name = context.Request["name"];
//context.Response.Write("Hello World");
using (Bitmap bmp = new Bitmap(500, 500))//创建一个尺寸为500*500的内存图片
using (Graphics g = Graphics.FromImage(bmp))//得到图片的画布
{
g.DrawString(name, new Font(FontFamily.GenericSerif, 30), Brushes.Red, 100, 100);//Font应该被释放
g.DrawEllipse(Pens.Blue, 100, 100, 100, 100);
//bmp.Save(@"一幅动态创建的图片.jpg", ImageFormat.Jpeg);//图片保存到输出流
//直接保存到网页输出流中
bmp.Save(context.Response.OutputStream, ImageFormat.Jpeg);//图片保存到输出流
}
}
public bool IsReusable
{
get
{
return false;
}
}
}
}
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.Linq;
using System.Web;
namespace _2_一般处理程序
{
/// <summary>
/// 显示访问者信息 的摘要说明
/// </summary>
public class 显示访问者信息 : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "image/jpeg";
using (Bitmap bmp = new Bitmap(500, 200))//创建一个尺寸为500*500的内存图片
using (Graphics g = Graphics.FromImage(bmp))//得到图片的画布
using (Font font = new Font(FontFamily.GenericSerif, 30))
{
HttpRequest request = context.Request;
g.DrawString("IP:" + request.UserHostAddress, font, Brushes.Red, 0, 0);
g.DrawString("浏览器:" + request.Browser.Browser + request.Browser.Version, font, Brushes.Red, 0, 50);
g.DrawString("操作系统:" + request.Browser.Platform, font, Brushes.Red, 0, 100);
bmp.Save(context.Response.OutputStream, ImageFormat.Jpeg);//图片保存到输出流
}
}
public bool IsReusable
{
get
{
return false;
}
}
}
}
验证码：
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>登录</title>
<script type="text/javascript">
function RefreshCode()
{
var CheckCode = document.getElementById("CheckCode");
CheckCode.src = "CheckCode.ashx?t="+new Date();
}
</script>
</head>
<body>
<form action="Login.ashx" method="post">
姓名：<input type="text" name="txtName" />
密码：<input type="password" name="txtPwd" />
验证码：<img src="CheckCode.ashx" id="CheckCode" onclick="RefreshCode()" />
<input type="text" name="txtCode" />
<input type="submit" name="btnLogin" value="提交" />
<div style="padding:10px; color:red;">{^msg$}</div>
</form>
</body>
</html>
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.Linq;
using System.Web;
namespace _2_一般处理程序
{
/// <summary>
/// 验证码 的摘要说明
/// </summary>
public class 验证码 : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
//动态生成一张200*50的图片，显示一个随机的4位数。
context.Response.ContentType = "image/jpeg";
using (Bitmap bmp = new Bitmap(200, 50))//创建一个尺寸为500*500的内存图片
using (Graphics g = Graphics.FromImage(bmp))//得到图片的画布
using (Font font = new Font(FontFamily.GenericSerif, 30))
{
Random rd = new Random();
string num = " ";
for (int i = 0; i < 4; i++)
{
num += rd.Next(0,9)+" ";
}
HttpRequest request = context.Request;
g.DrawString(num.ToString(), font, Brushes.Red,30, 0);
bmp.Save(context.Response.OutputStream, ImageFormat.Jpeg);//图片保存到输出流
}
}
public bool IsReusable
{
get
{
return false;
}
}
}
}
