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背景：如果无法直接访问保存图片的服务器，我们可以先制作一个aspx页面用来接受服务器发送过来的图片，然后html页面请求aspx页面。对图片服务器起一定的缓冲保护作用，预防对黑客攻击造成危害。
注意:不可以是直接设置aspx页面中的图片控件的imageurl，此方法已实验不成功。
1. showpic.aspx页面
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="showpic.aspx.cs" Inherits="NewProject.showpic" %>
2. showpic.aspx.cs 后台代码
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.IO; using System.Web.UI.WebControls; using System.Net; namespace NewProject { public partial class showpic : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { //Image.ImageUrl = "http://local/v1/tfs/T1.ysssTByYT1RCvBVdK"; string url = "http://local/v1/tfs/T1.ysefsefsefvBVdK"; string contentType="application/x-www-form-urlencoded"; Stream reqStream = SendGetRequestForStream(url,contentType); MemoryStream ms = new MemoryStream(); reqStream.CopyTo(ms); //Response.Write(ms.ToArray());//这种方法错误 Response.BinaryWrite(ms.ToArray());//可以 //HttpContext.Current.Response.BinaryWrite(ms.ToArray());//可以 } private Stream SendGetRequest1(string url) { string content; HttpRequest request;// Enables ASP.NET to read the HTTP values sent by a client during a Web request. WebRequest webrequest;// Makes a request to a Uniform Resource Identifier (URI). This is an abstract HttpWebRequest httpWebRequest;// Provides an HTTP-specific implementation of the System.Net.WebRequest class. HttpWebResponse httpWebResponse; //string url = "fsefsf"; httpWebRequest = WebRequest.Create(url) as HttpWebRequest; httpWebRequest.AllowAutoRedirect = true; httpWebRequest.Method = "GET"; httpWebRequest.ContentType = "application/x-www-form-urlencoded"; //httpwebrequest.ContentType = "application/json"; //httpwebrequest.ContentType = "application/xml"; //httpwebrequest.Headers.Add("url",url); httpWebResponse = httpWebRequest.GetResponse() as HttpWebResponse; Stream resStream = httpWebResponse.GetResponseStream(); using (StreamReader sr = new StreamReader(resStream)) { content = sr.ReadToEnd(); } return resStream; } } }
3. pic.html 页面
<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title></title> </head> <body> <div> <img src="showpic.aspx" alt="Alternate Text" /> </div> </body> </html>
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原文地址：http://www.cnblogs.com/slu182/p/4435432.html
