我通过以下步骤找到了解决方案
urlConnection = (HttpURLConnection) url
.openConnection();
urlConnection.setDoOutput(true);
urlConnection.setRequestMethod("POST");
urlConnection.setRequestProperty("Content-Type", "application/json");
urlConnection.setRequestProperty("x-api-key", x_api);
urlConnection.setRequestProperty("Accept", "application/json");
String datajson = "{\"file\": \""+imageString.trim()+"\"}";
Log.e("data","json:"+datajson);
OutputStream os = urlConnection.getOutputStream();
os.write(datajson.getBytes("UTF-8"));
os.close();
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我来说两句