HarmonyOS 鸿蒙HTTP post请求，怎么实现 OutputStream 上传方式

URL url = new URL(uploadUrl);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
con.setDoOutput(true);
con.setRequestMethod(“POST”);
con.addRequestProperty(“Content-Type”, “multipart/form-data; boundary=” + boundary);

FileInputStream fs = new FileInputStream(file);
OutputStream output = con.getOutputStream();

output.write(textbody);
output.write(binarybody);
byte[] buff = new byte[1024];
int r;
while ((r = fs.read(buff, 0, buff.length)) >= 0) {
   output.write(buff, 0, r);
}
output.write(terminate);
output.close();
fs.close();

这段代码怎么转成ArkTs