如何最好地捕获由aspx页面呈现的HTML (在我的实例中,用于日志记录)?
我不想使用Response.Write写回页面,因为它弄乱了我的站点布局。
使用Response.OutputStream或Response.Output的流会导致ArgumentException ({System.ArgumentException: stream不可读。)
发布于 2008-12-22 16:22:00
问得好,我不得不试一试,看看我是否可以创建一个HttpModule来做你所描述的事情。
我没有任何机会尝试从响应流中读取,但是使用ResponseFilter给了我一种捕获内容的方法。
下面的代码看起来运行得很好,我想也许你可以使用这些代码作为基础。但请记住,这只是我快速拼凑起来的东西,它没有以任何方式进行测试。所以不要在任何生产环境中使用它,除非进行了适当的审查/测试等等。尽管如此,请随时对此发表评论;)
public class ResponseLoggerModule : IHttpModule
{
private class ResponseCaptureStream : Stream
{
private readonly Stream _streamToCapture;
private readonly Encoding _responseEncoding;
private string _streamContent;
public string StreamContent
{
get { return _streamContent; }
private set
{
_streamContent = value;
}
}
public ResponseCaptureStream(Stream streamToCapture, Encoding responseEncoding)
{
_responseEncoding = responseEncoding;
_streamToCapture = streamToCapture;
}
public override bool CanRead
{
get { return _streamToCapture.CanRead; }
}
public override bool CanSeek
{
get { return _streamToCapture.CanSeek; }
}
public override bool CanWrite
{
get { return _streamToCapture.CanWrite; }
}
public override void Flush()
{
_streamToCapture.Flush();
}
public override long Length
{
get { return _streamToCapture.Length; }
}
public override long Position
{
get
{
return _streamToCapture.Position;
}
set
{
_streamToCapture.Position = value;
}
}
public override int Read(byte[] buffer, int offset, int count)
{
return _streamToCapture.Read(buffer, offset, count);
}
public override long Seek(long offset, SeekOrigin origin)
{
return _streamToCapture.Seek(offset, origin);
}
public override void SetLength(long value)
{
_streamToCapture.SetLength(value);
}
public override void Write(byte[] buffer, int offset, int count)
{
_streamContent += _responseEncoding.GetString(buffer);
_streamToCapture.Write(buffer, offset, count);
}
public override void Close()
{
_streamToCapture.Close();
base.Close();
}
}
#region IHttpModule Members
private HttpApplication _context;
public void Dispose()
{
}
public void Init(HttpApplication context)
{
_context = context;
context.PreRequestHandlerExecute += new EventHandler(context_PreRequestHandlerExecute);
context.PreSendRequestContent += new EventHandler(context_PreSendRequestContent);
}
void context_PreRequestHandlerExecute(object sender, EventArgs e)
{
_context.Response.Filter = new ResponseCaptureStream(_context.Response.Filter, _context.Response.ContentEncoding);
}
void context_PreSendRequestContent(object sender, EventArgs e)
{
ResponseCaptureStream filter = _context.Response.Filter as ResponseCaptureStream;
if (filter != null)
{
string responseText = filter.StreamContent;
// Logging logic here
}
}
#endregion
}
发布于 2008-12-22 15:23:16
许多负载测试器将允许您记录所生成的超文本传输协议响应,但请记住,对于ASP.NET,这些可能是一些非常大的日志文件。
编辑:根据Tom Jelen的代码,Response.Filter就是为了提供这种疏忽而设计的,而Response.Outputstream在其他方面是不可读的。
编辑2:用于页面而不是HTTPModule
public class ObserverStream : Stream
{
private byte[] buffer = null;
private Stream observed = null;
public ObserverStream (Stream s)
{
this.observed = s;
}
/* important method to extend #1 : capturing the data */
public override void Write(byte[] buffer, int offset, int count)
{
this.observed.Write(buffer, offset, count);
this.buffer = buffer; //captured!
}
/* important method to extend #2 : doing something with the data */
public override void Close()
{
//this.buffer available for logging here!
this.observed.Close();
}
/* override all the other Stream methods/props with this.observed.method() */
//...
}
在你的Page_Load中(或者在你的响应被写出来之前)
Response.Filter = new ObserverStream(Response.Filter);
发布于 2008-12-22 15:35:11
向您自己的服务器发出服务器端XMLHTTP请求的一种方法。抓取结果并将其保存到文件或DB中。
或者,您也可以在客户机上使用AJAX,获取结果,然后将其发送回服务器。
https://stackoverflow.com/questions/386487
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