发送名为Mulitpart数据机智的HttpClient
问题描述:
我尝试使用C#的HttpClient发送名为Mulitpart数据机智的HttpClient
我的代码来发送多部分内容的发布到web服务下面
public string UploadDocument(Stream stream)
{
MultipartContent multipart = new MultipartContent();
//multipart.Add(new StreamContent(stream), "importFile");
StreamContent content = new StreamContent(stream);
multipart.Add(content);
Client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
HttpResponseMessage response = Client.PostAsync("URL to webservice", multipart).Result;
string result = response.Content.ReadAsStringAsync().Result;
//Wirft eine Exception wenn der StatusCode nicht 200 (OK) ist.
response.EnsureSuccessStatusCode();
return result;
}
我需要的流内容被命名,如何我可以做吗。
我发现一个Java方式做到这一点,但在C#中我没有找到一个参数“名称”
这里了Java的例子(见“的importfile”)
httpRequest = new HttpPostwebviewer/?action=import");
// set headers
httpRequest.setHeader(HEADER_NAME_ACCEPT, "application/json");
// prepare upload entity
MultipartEntityBuilder meBuilder = MultipartEntityBuilder.create();
meBuilder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
meBuilder.setCharset(Consts.UTF_8);
meBuilder.addPart("importFile", contentBody);
// build upload entity
HttpEntity uploadEntity = meBuilder.build();
// set properties to http request
((HttpPost) httpRequest).setEntity(uploadEntity);
答
您可以使用System.Net.HttpWebRequest做同样的,下面是我使用的代码:
public static void UploadFile(string url, string file, string paramName, string contentType, NameValueCollection nvc)
{
string boundary = "---------------------------" + DateTime.Now.Ticks.ToString("x");
byte[] boundarybytes = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "\r\n");
url = handlerLocation + url;
HttpWebRequest wr = (HttpWebRequest)WebRequest.Create(url);
wr.ContentType = "multipart/form-data; boundary=" + boundary;
wr.Method = "POST";
wr.KeepAlive = true;
wr.Credentials = System.Net.CredentialCache.DefaultCredentials;
Stream rs = wr.GetRequestStream();
string formdataTemplate = "Content-Disposition: form-data; name=\"{0}\"\r\n\r\n{1}";
foreach (string key in nvc.Keys)
{
rs.Write(boundarybytes, 0, boundarybytes.Length);
string formitem = string.Format(formdataTemplate, key, nvc[key]);
byte[] formitembytes = System.Text.Encoding.UTF8.GetBytes(formitem);
rs.Write(formitembytes, 0, formitembytes.Length);
}
rs.Write(boundarybytes, 0, boundarybytes.Length);
string headerTemplate = "Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\nContent-Type: {2}\r\n\r\n";
string header = string.Format(headerTemplate, paramName, file, contentType);
byte[] headerbytes = System.Text.Encoding.UTF8.GetBytes(header);
rs.Write(headerbytes, 0, headerbytes.Length);
FileStream fileStream = new FileStream(file, FileMode.Open, FileAccess.Read);
byte[] buffer = new byte[4096];
int bytesRead = 0;
while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
{
rs.Write(buffer, 0, bytesRead);
}
fileStream.Close();
byte[] trailer = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "--\r\n");
rs.Write(trailer, 0, trailer.Length);
rs.Close();
WebResponse wresp = null;
try
{
wresp = wr.GetResponse();
Stream stream2 = wresp.GetResponseStream();
StreamReader reader2 = new StreamReader(stream2);
}
catch (Exception ex)
{
//WriteTrace(ex.Message);
if (wresp != null)
{
wresp.Close();
wresp = null;
}
}
finally
{
wr = null;
}
}