/// <summary>
/// 输出真实文件
/// </summary>
/// <param name="response"></param>
/// <param name="context"></param>
private void Real(HttpResponse response,HttpRequest request)
{
FileInfo file = new System.IO.FileInfo(request.PhysicalPath);
response.Clear();
response.AddHeader("Content-Disposition", "filename=" + file.Name);
response.AddHeader("Content-Length", file.Length.ToString());
string fileExtension = file.Extension.ToLower();
//这里选择输出的文件格式
//可以参考http://ewebapp.cnblogs.com/articles/234756.HTML增加对更多文件格式的支持.
switch (fileExtension)
{
case "mp3":
response.ContentType = "audio/mpeg3";
break;
case "mpeg":
response.ContentType = "video/mpeg";
break;
case "jpg":
response.ContentType = "image/jpeg";
break;
case "bmp":
response.ContentType = "image/bmp";
break;
case "gif":
response.ContentType = "image/gif";
break;
case "doc":
response.ContentType = "application/msword";
break;
case "CSS":
response.ContentType = "text/CSS";
break;
default:
response.ContentType = "application/octet-stream";
break;
}
response.WriteFile(file.FullName);
response.End();
}
/// <summary>
/// 确认字符串是否为空
/// </summary>
/// <param name="_value"></param>
/// <returns></returns>
private bool Empty(string _value)
{
if(_value == null | _value == string.Empty | _value == "")
{
return true;
}
else
{
return false;
}
}
/// <summary>
/// 检查是否是非法链接
/// </summary>
/// <param name="context"></param>
/// <param name="_myDomain"></param>
/// <returns></returns>
private bool errorLink(HttpContext context,out string _myDomain)
{
HttpResponse response = context.Response;
string myDomain = context.Request.ServerVariables["SERVER_NAME"];
_myDomain = myDomain ;
string myDomainIp = context.Request.UserHostAddress;
eWebapp_NoLink = ConfigurationSettings.AppSettings["eWebapp_NoLink"];
eWebapp_AllowLink = ConfigurationSettings.AppSettings["eWebapp_AllowLink"];
try
{
eWebapp_AllowOnlyFile = Convert.ToBoolean(ConfigurationSettings.AppSettings["eWebapp_AllowOnlyFile"]);
}
catch
{
eWebapp_AllowOnlyFile = true;
}
if(context.Request.UrlReferrer != null)
{
//判定referDomain是否存在网站的IP或域名
string referDomain = context.Request.UrlReferrer.AbsoluteUri.Replace(context.Request.UrlReferrer.AbsolutePath,"");
string myPath = context.Request.RawUrl;
if(referDomain.IndexOf(myDomainIp) >=0 | referDomain.IndexOf(myDomain)>=0)
{
return false;
}
else
{
//这里使用正则表达对规则进行匹配
try
{
Regex myRegex ;
//检查允许匹配
if(!Empty(eWebapp_AllowLink))
{
myRegex = new Regex(eWebapp_AllowLink);
if(myRegex.IsMatch(myPath))
{
return false;
}
}
//检查禁止匹配
if(!Empty(eWebapp_NoLink))
{
myRegex = new Regex(eWebapp_NoLink);
if(myRegex.IsMatch(myPath))
{
return true;
}
else
{
return false;
}
}
return true;
}
catch
{
//如果匹配出错，链接错误
return true;
}
}
}
else
{
//是否允许直接访问文件
if(eWebapp_AllowOnlyFile)
{
return false;
}
else
{
return true;
}
}
}
}
}
http://www.cnblogs.com/zhouxujian/archive/2006/10/12/527673.HTML
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