apollo-adminservice/src/main/java/com/ctrip/framework/apollo/adminservice/controller/AccessKeyController.java/AccessKeyController/create
class AccessKeyController:  @PostMapping(value = "/apps/{appId}/accesskeys")
  public AccessKeyDTO create(@PathVariable String appId, @RequestBody AccessKeyDTO dto) {
    AccessKey entity = BeanUtils.transform(AccessKey.class, dto);
    entity = accessKeyService.create(appId, entity);
    return BeanUtils.transform(AccessKeyDTO.class, entity);
  }