如何通过spring处理http请求？

我有一个任务来形成这样的查询：

POST /foo HTTP/1.1
Content-Length: 68137
Content-Type: multipart/form-data; boundary=---------------------------974767299852498929531610575

-----------------------------974767299852498929531610575
Content-Disposition: form-data; name="description"

some text
-----------------------------974767299852498929531610575
Content-Disposition: form-data; name="myFile"; filename="1.txt"
Content-Type: text/plain

(content of the uploaded file 1.txt)
-----------------------------974767299852498929531610575--

这样它由两部分组成：来自文件的文本和数据。

为了形成这样的请求，我在客户端上执行以下代码：

public void sendPOSTRequest(String url, String authData, String attachmentFilePath, String outputFilePathName) {
        
        String charset = "UTF-8";
        File binaryFile = new File(attachmentFilePath);
        String boundary = "------------------------" + Long.toHexString(System.currentTimeMillis()); // Just generate some unique random value.
        String CRLF = "\r\n"; // Line separator required by multipart/form-data.
        int responseCode = 0;

        try {
            //Set POST general headers along with the boundary string (the seperator string of each part)
            URLConnection connection = new URL(url).openConnection();
            connection.setDoOutput(true);
            connection.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);
            //connection.addRequestProperty("User-Agent", "CheckpaySrv/1.0.0");
            //connection.addRequestProperty("Accept", "*/*");
            //connection.addRequestProperty("Authentication", authData);

            OutputStream output = connection.getOutputStream();
            PrintWriter writer = new PrintWriter(new OutputStreamWriter(output, charset), true);

            writer.append("--" + boundary).append(CRLF);
            writer.append("Content-Disposition: form-data;").append(CRLF);
            writer.append("Content-Type: application/json").append(CRLF);// + URLConnection.guessContentTypeFromName(binaryFile.getName())).append(CRLF);
            writer.append("{\"a\":\"asda\"}").append(CRLF);// + URLConnection.guessContentTypeFromName(binaryFile.getName())).append(CRLF);
            writer.append(CRLF);
            
            // Send binary file - part
            // Part header
            writer.append("--" + boundary).append(CRLF);
            writer.append("Content-Disposition: form-data; name=\"file\"; filename=\"" + binaryFile.getName() + "\"").append(CRLF);
            writer.append("Content-Type: application/octet-stream").append(CRLF);// + URLConnection.guessContentTypeFromName(binaryFile.getName())).append(CRLF);
            writer.append(CRLF);
            writer.flush();

            // File data
            Files.copy(binaryFile.toPath(), output);
            output.flush();

            // End of multipart/form-data.
            writer.append(CRLF).append("--" + boundary + "--").flush();

            //Отправить запрос и ожидать ответ от сервера
            responseCode = ((HttpURLConnection) connection).getResponseCode(); 
 
            if (responseCode != 200) //We operate only on HTTP code 200
            {
                return;
            }

            InputStream Instream = ((HttpURLConnection) connection).getInputStream();

            // Write PDF file 
            BufferedInputStream BISin = new BufferedInputStream(Instream);
            FileOutputStream FOSfile = new FileOutputStream(outputFilePathName);
            BufferedOutputStream out = new BufferedOutputStream(FOSfile);

            int i;
            while ((i = BISin.read()) != -1) {
                out.write(i);
            }

            // Cleanup
            out.flush();
            out.close();

        } catch (Exception e) {
            e.printStackTrace();
        }

    }

我尝试在服务器上使用以下代码处理此请求：

@RequestMapping(value = "/test6", method = RequestMethod.POST, consumes = { MediaType.MULTIPART_FORM_DATA_VALUE })
    public String test6(@RequestPart String part1) {
        System.out.println("data1: "+part1);
        System.out.println("Stop");
        return "string1";
    }

在向地址：http://localhost:8080/test6 发送 post 请求的过程中，在服务器上我收到以下消息：

WARN 2356 --- [nio-8080-exec-2] .w.s.m.s.DefaultHandlerExceptionResolver : 
Resolved [org.springframework.web.multipart.support.MissingServletRequestPartException: 
Required request part 'part1' is not present]

告诉我如何使用 multipart/form-data 类型处理这样的 post 请求？