안드로이드에서 서버로 데이터 송수신 관련 질문입니다.

Question

고수님들의 도움이 절실히 필요합니다.

안드로이드에서 서버로 데이터 송수신 관련 질문입니다.

전송하는 데이터 타입은 json입니다.

아래의 code로 서버로부터 데이터를 받아올 경우에는 문제가 없습니다.(get)

RestTemplate restTemplate = new RestTemplate();
restTemplate.getMessageConverters().add(new MappingJacksonHttpMessageConverter());
  
String url = mServerURL.substring(0);
ResultEnvelopeTO envelop = restTemplate.getForObject(url, ResultEnvelopeTO.class);

그러나, 서버로 데이터를 저장할 경우, 400 Bad Request가 발행합니다. (post) 

public static ResultEnvelopeTO POST_TO(String userID, String resource, Object obj) {
                     int loop = sRetryCount;
 do {
  try {
   RestTemplate restTemplate = new RestTemplate();
   restTemplate.getMessageConverters().add(new MappingJacksonHttpMessageConverter());
       
   String url = mServerURL.substring(0);   
   ResultEnvelopeTO response =  restTemplate.postForObject(url, obj, ResultEnvelopeTO.class); 
   return response;
  } catch(org.springframework.web.client.ResourceAccessException e) {
   System.out.println(e.getMessage()); 
   if (e.getRootCause() instanceof java.net.SocketTimeoutException) {
    continue;
   }
    
   e.printStackTrace();
   break;
  } catch(RuntimeException x) {
   System.out.println(x.getMessage());
   x.printStackTrace();
   break;
                                          }
 } while(0 <= --loop);
 return null;
}

에러는 아래와 같이 나타납니다.

400 Bad Request
org.springframework.web.client.HttpClientErrorException: 400 Bad Request
at org.springframework.web.client.DefaultResponseErrorHandler.handleError(DefaultResponseErrorHandler.java:76)
at org.springframework.web.client.RestTemplate.handleResponseError(RestTemplate.java:524)
at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:481)
at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:439)
at org.springframework.web.client.RestTemplate.postForObject(RestTemplate.java:317)
at com.lge.ifsda.android.provider.task.server.util.TaskUtils.testServerDAO_POST_TO(TaskUtils.java:138)
at com.lge.ifsda.android.provider.task.server.TaskSleepReportDate.setUserFeedbackList(TaskSleepReportDate.java:143)
at com.lge.ifsda.android.provider.task.file.TaskSleepReportDate.setUserFeedback(TaskSleepReportDate.java:295)
at com.lge.ifsda.android.provider.task.server.TaskSleepReportDate.tx(TaskSleepReportDate.java:41)
at com.lge.ifsda.android.provider.FSAnalyzerApplication$3.doInBackground(FSAnalyzerApplication.java:450)
at com.lge.ifsda.android.provider.FSAnalyzerApplication$FSAnalyzerAsyncTask.doInBackground(FSAnalyzerApplication.java:1)
at android.os.AsyncTask$2.call(AsyncTask.java:288)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:841)