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aspx页面图片用作html中img的url

2015-04-17 16:57 435 查看

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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