node 서버에서 안드로이드에서 post로 보낸 json 문자열이 받아지지 않아요

try {
                    JSONObject obj = new JSONObject();
                    obj.put("id", editid.getText().toString());
                    obj.put("pw", editpassword.getText().toString());
                    final String jsonstring = obj.toString();
                    //final String jsonstring = "{\"id=\":\"abce\",\"pw\":\"13447\"}";
                    Log.i("tag",jsonstring);
                    Thread background = new Thread(new Runnable() {
                        @Override
                        public void run() {
                            try {
                                Log.i("tag", "Thread 시작");
                                URL url = new URL("http://49.172.86.247:80/login/controller_on");
                                HttpURLConnection hey = (HttpURLConnection) url.openConnection();
                                hey.setRequestMethod("POST");
                                hey.setDoInput(true);
                                hey.setDoOutput(true);
                                hey.setRequestProperty("Content-Type", "application/json");
                                hey.setConnectTimeout(10000);
                                hey.setUseCaches(false);
 
 
 
                                DataOutputStream wr = new DataOutputStream(hey.getOutputStream());
 
 
                                InputStream inputStream = hey.getInputStream();
                                Log.i("tag", "write");
                                wr.writeBytes(jsonstring);
                                Log.i("tag", "flush");
                                wr.flush();
                                Log.i("tag", "close");
                                wr.close();
 
                            } catch (Exception e) {
                                Log.e("tag","error");
                            }
                        }
                    });
                    background.start();
 
 
                } catch (JSONException e) {
                    e.printStackTrace();
                }

  app.post('/login/:termType', function(req, res){
        console.log(req.body); 
    });