entityBuilder.addPart("media", contentBody);
MediaResultMapper result = WxUtil.sendRequest(
config.getMediaUploadUrl(), HttpMethod.POST, params,
entityBuilder.build(), MediaResultMapper.class);
WxBaseItemMediaEntity resultEntity = null;
switch (type) {
case IMAGE:
WxItemImageEntity imageEntity = new WxItemImageEntity();
imageEntity.setMediaId(result.getMedia_id());
imageEntity.setCreatedDate(new Date(result.getCreated_at() * 1000));