httpmodule通过httpfilter获取返回的网页内容

来源：互联网发布：socket.io java服务端编辑：程序博客网时间：2024/05/22 08:17

自定义httpmodule里面：

public virtual void Init(HttpApplication app)        {            // WARNING!  This does not work with Windows authentication!            // If you are using Windows authentication, change to app.BeginRequest            app.BeginRequest += (sender, e) =>            {                app.Context.Response.Filter =                    new CatchTextStream(app.Response.Filter);            };        }

public class CatchTextStream : Stream
{
private Stream output;
public CatchTextStream(Stream s)
{
output = s;
}
public override bool CanRead
{
get { return output.CanRead; }
}

public override bool CanSeek
{
get { return output.CanSeek; }
}

public override bool CanWrite
{
get { return output.CanWrite; }
}

public override void Flush()
{
output.Flush();
}

public override long Length
{
get { return output.Length; }
}

public override long Position
{
get { return output.Position; }
set { output.Position = value; }
}

public override int Read(byte[] buffer, int offset, int count)
{
return output.Read(buffer, offset, count);
}

public override long Seek(long offset, SeekOrigin origin)
{
return output.Seek(offset, origin);
}

public override void SetLength(long value)
{
output.SetLength(value);
}

public override void Write(byte[] buffer, int offset, int count)
{
StringComparison ignore = StringComparison.CurrentCultureIgnoreCase;
if (HttpContext.Current != null)
{
HttpContext context = HttpContext.Current;
if (context.Response.ContentType.Equals("text/html", ignore))
{
Encoding encoding = context.Response.ContentEncoding;
//此处获取返回的HTML内容

string html = encoding.GetString(buffer, offset, count);

byte[] bytes = encoding.GetBytes(html);
output.Write(bytes, 0, bytes.Length);

}
else
output.Write(buffer, offset, count);
}
}
}

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