c# HttpClient upload file to spring rest service

Question

Problem: I have a Java spring rest service to upload a file (large size). I want use a .NET httpClient (or other .net client) to call upload service.

Questions:

It seems that best option to send large file is multi-part file, what's about interoperability ?
If it weren't possible, what is the best alternative ?

Thank you!

score 4 · Accepted Answer · answered Jun 05 '13 at 16:17

This is the answer: I can send a file with multipart attachment from c# client to Java JAX Rest Webservice.

 try
        {
            using (
            var client = new HttpClient())
            using (var form = new MultipartFormDataContent())
            {
                using (var stream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite)) {
                    using (var fileContent = new StreamContent(stream)) {

                        fileContent.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment") {FileName = fileName, DispositionType = DispositionTypeNames.Attachment, Name = "fileData"};

                        form.Add(fileContent);
                        // only for test purposes, for stable environment, use ApiRequest class.
                        response = client.PostAsync(url, form).Result;
                    }
                }
            }

            return response.RequestMessage != null ? response.ReasonPhrase : null;
        }
        catch (Exception ex)
        {
            TraceManager.TraceError("Post Asyn Request to " + url + " \n" + ex.Message, ex);
            throw;
        }

score 1 · Answer 2 · answered Apr 12 '13 at 07:19

1

HTTP is a standard that is independent of OS platforms and programming languages, so you shouldn't have any problems with interoperability in case your .net client complies with the standards.

answered Apr 12 '13 at 07:19

zagyi

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48

Ok, this is the idea, from Michael Teper [ASP.NET WebApi: how to perform a multipart post with file upload using WebApi HttpClient](http://stackoverflow.com/a/10744043) I will try to simulate a multi-part file upload post using the HttpClient API. – Donald Apr 12 '13 at 07:33
I'm not familiar with that .net client library, but I suppose it generates a standard multipart post request. I guess, the java/spring service on the server side doesn't make any assumptions about the type of the client, just accepts normal multipart requests, so they should just work together. – zagyi Apr 12 '13 at 07:50

score 0 · Answer 3 · answered Jul 07 '17 at 20:55

java spring boot

@RequestMapping(value="/upload", method=RequestMethod.POST)
public @ResponseBody String upload(@RequestParam("FileParam") MultipartFile file){
    InputStream fromClient=file.getInputStream();
    ...do stuff with the database/ process the input file...

c#

HttpClient client = new HttpClient();
MultipartFormDataContent form = new MultipartFormDataContent();
FileInfo file = new FileInfo(@"<file path>");
form.Add(new StreamContent(file.OpenRead()),"FileParam",file.Name);
HttpResponseMessage response = await client.PostAsync("http://<host>:<port>/upload", form);
Console.WriteLine(response.StatusCode);
Console.WriteLine(response.ReasonPhrase);
Console.WriteLine(response.ToString());
Console.WriteLine(Encoding.ASCII.GetString(await response.Content.ReadAsByteArrayAsync()));

c# HttpClient upload file to spring rest service

3 Answers3