ASP.NET读取网络或本地图片显示（转）

写这个的缘由是在CSDN看到的两个问题：
1、抓取网络图片，不在本地保存而直接显示
2、在站点服务器上某个磁盘的文件里有图片，想能够在网站上显示出来，图片文件夹不在站点目录 

一、读取网络图片

<!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" mce_src="http://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;
        }
    }
}

二、读取本地图片

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;
        }
    }
}

原文链接：http://blog.csdn.net/IHandler/article/details/6164901

posted @ 2014-03-07 11:00  邹邹  Views(480)  Comments(0)    收藏  举报