Question

我正在尝试使用HttpWebRequest对象将ASP.Net应用程序中的Web URL连接到java Web应用程序，并获取状态200 OK。但是当我尝试使用GetResponseStream（）读取响应内容时，我收到错误'responseStream.Length'抛出了类型'System.NotSupportedException'的异常

这是代码

string uri="https://myapp.com/mainservlet/";

System.Net.HttpWebRequest hwrequest = (System.Net.HttpWebRequest)System.Net.WebRequest.Create(uri);
            hwrequest.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
            hwrequest.AllowAutoRedirect = true;
            hwrequest.UserAgent = "http_requester/0.1";
            hwrequest.Timeout = 60000;
            hwrequest.Method = "POST";
            if (hwrequest.Method == "POST")
            {
                hwrequest.ContentType = "text/xml";
                // Use UTF8Encoding instead of ASCIIEncoding for XML requests:
                System.Text.ASCIIEncoding encoding = new System.Text.ASCIIEncoding();
                byte[] postByteArray = encoding.GetBytes(postData);
                hwrequest.ContentLength = postByteArray.Length;
                 System.IO.Stream  poststream = hwrequest.GetRequestStream();
                poststream.Write(postByteArray, 0, postByteArray.Length);
                poststream.Close();
            }

            //Get the Response now.
            hwresponse = (System.Net.HttpWebResponse)hwrequest.GetResponse();

         //  System.Xml.Linq.XDocument doc;
            //hwresponse.Method = "GET";
            string str = hwresponse.CharacterSet;
            string str1 = hwresponse.ContentEncoding;
            if (hwresponse.StatusCode == System.Net.HttpStatusCode.OK)
            {

                System.IO.Stream responseStream = hwresponse.GetResponseStream();
               // Here i am getting that exception

注意：当我尝试在浏览器中粘贴相同的网址时，

错误404 - 未找到来自RFC 2068超文本传输协议 - HTTP / 1.1： 10.4.5 404未找到服务器未找到与Request-URI匹配的任何内容。没有说明该病症是暂时的还是永久性的。如果服务器不希望将此信息提供给客户端，则可以使用状态代码403（禁止）。如果服务器通过一些内部可配置的机制知道旧资源永久不可用且没有转发地址，则应该使用410（Gone）状态代码。

它也进入200 OK状态并显示异常。有人可以帮我解决/建议吗？

Answer 1

使用此功能可以使响应已使用4年，现在始终有效。

 HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            if (response.StatusCode == HttpStatusCode.OK)
            {
                Stream responseStream = response.GetResponseStream();
                StreamReader myStreamReader = new StreamReader(responseStream);
                responseData = myStreamReader.ReadToEnd();
            }
            response.Close();

Answer 2

为什么要检查它是否是帖子？

请尝试阅读此类流。然后，您还可以设置实际需要的网页数据。

Dim ResponseStream As Stream = Response.GetResponseStream()
            Try
                Dim reader As New StreamReader(Stream.Null)
                Try
                    reader = New StreamReader(ResponseStream, System.Text.Encoding.GetEncoding(CharSet), True, 256)
                Catch ex As Exception

                    '
                    ' Redo the stream
                    '
                    If InStr(ex.Message, "not a supported encoding name.") > 0 Then
                        Try
                            reader = New StreamReader(ResponseStream, System.Text.Encoding.GetEncoding("utf-8"), True, 256)
                        Catch ex1 As Exception

                        End Try
                    End If
                End Try
                '
                'Dim string to build index.
                '
                Dim IndexBuildString As New StringBuilder()
                Try
                    Dim read(256) As [Char]
                    '
                    ' Reads 256 characters at a time.    
                    '
                    Dim ByteCount As Integer = reader.Read(read, 0, 256)
                    '
                    ' Read in while, exit it if exceeds ~ 390 kb
                    '
                    While ByteCount > 0
                        '
                        'Check if limit of kilobytes are over the limit.
                        '
                        If System.Text.ASCIIEncoding.Unicode.GetByteCount(IndexBuildString.ToString()) > 153600 Then
                            Exit While
                        End If
                        '
                        'Dumps the 256 characters to a string and displays the string to the console.
                        '
                        Dim str As New [String](read, 0, ByteCount)
                        ByteCount = reader.Read(read, 0, 256)
                        '
                        'Append to the StringBuilder
                        '
                        IndexBuildString.Append(str)
                    End While
                    '
                    'Assign the Stringbuilder and then clear it
                    ' 
                    IndexString = CleanIndexString(IndexBuildString.ToString())
                Catch ex As Exception

                Finally

                    Try
                        IndexBuildString.Clear()
                        reader.Close()
                        reader.Dispose()
                    Catch ex As Exception

                    End Try
                End Try
            Catch ex As Exception

            Finally
                ResponseStream.Dispose()
            End Try

您必须添加自己的错误处理....

HttpWebResponse.GetResponseStream（）。长度抛出异常，即使结果是200 OK状态

2 个答案: