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ASP.NET读取网络图片并在页面上显示

2011-01-19 10:57 651 查看

/article/6968082.html

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<img src="Handler.ashx?url=http://www.google.com.hk/intl/zh-CN/images/logo_cn.png"
alt="google logo" />
</div>
</form>
</body>
</html>

Handler.ashx

<%@ WebHandler Language="C#" Class="Handler" %>
using System;
using System.Web;
using System.Net;
using System.Drawing;
using System.IO;

public class Handler : IHttpHandler {

public void ProcessRequest (HttpContext context) {
string imgUrl = context.Request["Url"];
if (!string.IsNullOrEmpty(imgUrl))
{
Uri myUri = new Uri(imgUrl);
WebRequest webRequest = WebRequest.Create(myUri);
WebResponse webResponse = webRequest.GetResponse();
Bitmap myImage = new Bitmap(webResponse.GetResponseStream());

MemoryStream ms = new MemoryStream();
myImage.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
context.Response.ClearContent();
context.Response.ContentType = "image/Jpeg";
context.Response.BinaryWrite(ms.ToArray());
}
}

public bool IsReusable {
get {
return false;
}
}
}

补充：

　　读取本地文件，如：d:/1.jpg

<%@ WebHandler Language="C#" Class="Handler2" %>

using System;
using System.Web;
using System.IO;
using System.Drawing;

public class Handler2 : IHttpHandler {

public void ProcessRequest(HttpContext context)
{
string path = context.Request.QueryString["path"];
if (!string.IsNullOrEmpty(path))
{
FileStream fs = new FileStream(@path, FileMode.Open, FileAccess.Read);
Bitmap myImage = new Bitmap(fs);

MemoryStream ms = new MemoryStream();
myImage.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
context.Response.ClearContent();
context.Response.ContentType = "image/Jpeg";
context.Response.BinaryWrite(ms.ToArray());
}
}

public bool IsReusable {
get {
return false;
}
}

}

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