在我的Android应用中,我尝试通过restTemplate.postForEntity()进行POST,但是第一次尝试发布数据时,出现400错误。经过我的timetrigger同步方法尝试再次发布数据后,我可以得到200。我不认为这是一个后端问题,因为我在同一界面上通过Swagger和Postman进行了几次请求,但所有请求都没有问题。
这是我得到的错误:
POST request for "<url>" resulted in 400 (); invoking error handler
org.springframework.web.client.HttpClientErrorException: 400
这是我调试时在postForEntity()上看到的内容:
'java.lang.NullPointerException' Cannot evaluate org.springframework.http.ResponseEntity.toString()
这是代码:
public ResponseEntity<ArrayList> postServiceData(List<BasicService> attributes) {
HttpStatus status = null;
ResponseEntity<ArrayList> chargerServiceResponse = new ResponseEntity<ArrayList>(status);
try {
RestTemplate restTemplate = new RestTemplate();
restTemplate.getMessageConverters().add(new MappingJackson2HttpMessageConverter());
HttpEntity<?> entity = RestServiceUtils.getHttpEntity(attributes, context);
chargerServiceResponse = restTemplate.postForEntity(url, entity, ArrayList.class);
SynchronisationStorage synchronisationStorage = new SynchronisationStorage(context);
synchronisationStorage.updateLastSynchronisationDate();
loggingStorageDbHelper.logSuccess(R.string.logging_save_send_charger_service_to_backend, 1000);
} catch (HttpClientErrorException e) {
/* do stuff*/
}
}
设置正文和令牌:
@NonNull
public static HttpEntity<?> getHttpEntity(List attributes, Context context) {
HttpHeaders headers = new HttpHeaders();
try {
headers.set(ServiceAppConstants.HEADER_ACCEPT, ServiceAppConstants.MEDIATYPE_JSON);
UserStorage userStorage = new UserStorage(context);
String token = userStorage.getJsonWebToken();
headers.set(ServiceAppConstants.HEADER_SECURITY_TOKEN, token);
}catch (Exception ex){
Log.e(RestServiceUtils.class.getName(), "Exception ocurred while trying to set token to header", ex);
}
return new HttpEntity<Object>(attributes, headers);
}