[英]Having problems with httpost json string through vb.net
这是我用来发送到指定URL的代码。
Dim url = "http://www.abc.com/new/process"
Dim data As String = nvc.ToString
Dim postAddress = New Uri(Url)
Dim request = DirectCast(WebRequest.Create(postAddress), HttpWebRequest)
request.Method = "POST"
request.ContentType = "application/json"
Dim postByteData As Byte() = UTF8Encoding.UTF8.GetBytes(data)
request.ContentLength = postByteData.Length
Using postStream As Stream = request.GetRequestStream()
postStream.Write(postByteData, 0, postByteData.Length)
End Using
Using resp = TryCast(request.GetResponse(), HttpWebResponse)
Dim reader = New StreamReader(resp.GetResponseStream())
result.Response = reader.ReadToEnd()
End Using
现在问题是我在这里没有任何异常,但是我发布后应该得到的回复(成功或错误)并没有结束。 网址很好,我查了一下。 我是以正确的方式发送的吗?
我认为问题是StreamReader上的ReadToEnd方法在内部使用了Length属性。 如果服务器未在http标头中发送长度,则此值为null。 尝试使用内存流和缓冲区:
Dim url = "http://my.posturl.com"
Dim data As String = nvc.ToString()
Dim postAddress = New Uri(url)
Dim request As HttpWebRequest = WebRequest.Create(postAddress)
request.Method = "POST"
request.ContentType = "application/json"
Dim postByteData As Byte() = UTF8Encoding.UTF8.GetBytes(data)
request.ContentLength = postByteData.Length
Using postStream As Stream = request.GetRequestStream()
postStream.Write(postByteData, 0, postByteData.Length)
End Using
Using resp = TryCast(request.GetResponse(), HttpWebResponse)
Dim b As Byte() = Nothing
Using stream As Stream = resp.GetResponseStream()
Using ms As New MemoryStream()
Dim count As Integer = 0
Do
Dim buf As Byte() = New Byte(1023) {}
count = stream.Read(buf, 0, 1024)
ms.Write(buf, 0, count)
Loop While stream.CanRead AndAlso count > 0
b = ms.ToArray()
End Using
End Using
Console.WriteLine("Response: " + Encoding.UTF8.GetString(b))
Console.ReadLine()
End Using
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