Java Multipart POST 从 Web Api 服务器返回不支持的 MediaType

Question

我正在使用 SO question 的第一个答案中描述的“MultipartUtil”类.

我通过添加额外的行更改了构造函数，如下所示:

public MultiPartUtil(String requestURL, String charset) throws IOException {
    this.charset = charset;

    // creates a unique boundary based on time stamp
    boundary = "===" + System.currentTimeMillis() + "===";

    URL url = new URL(requestURL);
    httpConn = (HttpsURLConnection) url.openConnection();
    httpConn.setUseCaches(false);
    httpConn.setDoOutput(true); // indicates POST method
    httpConn.setDoInput(true);
    httpConn.setRequestMethod("POST");
    httpConn.setRequestProperty("Connection", "Keep-Alive");
    httpConn.setRequestProperty("Cache-Control", "no-cache");
    httpConn.setRequestProperty("enctype", "multipart/form-data");
    httpConn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);
    httpConn.setRequestProperty("User-Agent", "MTApp");

    outputStream = httpConn.getOutputStream();
    writer = new PrintWriter(new OutputStreamWriter(outputStream, charset), true);
}

上传文件的代码是:

MultiPartUtil multipart = new MultiPartUtil(url, "UTF-8");
multipart.addFilePart("archive", new File("archivefile.zip"));
multipart.finish();

在服务器端，我有:

[HttpPost]
public void upload()
{
    if (!Request.Content.IsMimeMultipartContent())
    {
        throw new HttpResponseException(Request.CreateResponse(HttpStatusCode.UnsupportedMediaType, "This request is not properly formatted"));
    }

    //Process file here...
}

在不允许接受文件的 Java 代码中我可能遗漏了什么？

Answer 1

能否请您尝试更改边界以呈现为 ---1234567--- 而不是 ===1234567===？

因为在 http header 参数中不允许使用 token 。