java - MultipartEntityBuilder 将 Content-Disposition header 添加到二进制文件并破坏它

Question

我有一个 Java 代码片段，它通过网络将二进制文件发送到 REST 客户端，不幸的是，对二进制文件进行编码的 multipartEntityBuilder 添加了一些损坏文件的 header ，例如它添加了一个 Content-Disposition ，它不是存在于原始文件中。

我该如何解决这个问题？

CloseableHttpClient httpclient = HttpClientBuilder.create().build();
HttpPost httpPost = new HttpPost(getRemoteUrlString() + "/webresources/file/upload");
MultipartEntityBuilder multipartEntityBuilder = MultipartEntityBuilder.create();
multipartEntityBuilder.setMode(HttpMultipartMode.STRICT);
multipartEntityBuilder.setBoundary("custyom-mimetype-boundary");
multipartEntityBuilder.addPart("fileName", (StringBody) valuesList.get(0));
multipartEntityBuilder.addPart("file", (FileBody) valuesList.get(1));
httpPost.setEntity(multipartEntityBuilder.build());
httpPost.setEntity(multipartEntityBuilder.build());
HttpResponse response = null;
try
    {
       response = httpclient.execute(httpPost);
    }
catch (IOException ex)
    {     
            }

Answer 1

我找到的唯一解决方案是将 header 留在发送端并修改接收端，显然，如果您不先读取 header 并丢弃它们，readBodyData 函数也会读取 header 。

//We read uselessHeaders otherwise readBodyData includes them and corrupts some files
String uselessHeaders = multipartStream.readHeaders();
multipartStream.readBodyData(byteArrayOutputStream);