import org.apache.hadoop.tools.proto.GetUserMappingsProtocolProtos.GetGroupsForUserResponseProto; //导入依赖的package包/类
@Override
public GetGroupsForUserResponseProto getGroupsForUser(
    RpcController controller, GetGroupsForUserRequestProto request)
    throws ServiceException {
  String[] groups;
  try {
    groups = impl.getGroupsForUser(request.getUser());
  } catch (IOException e) {
    throw new ServiceException(e);
  }
  GetGroupsForUserResponseProto.Builder builder = GetGroupsForUserResponseProto
      .newBuilder();
  for (String g : groups) {
    builder.addGroups(g);
  }
  return builder.build();
}
 

import org.apache.hadoop.tools.proto.GetUserMappingsProtocolProtos.GetGroupsForUserResponseProto; //导入依赖的package包/类
@Override
public String[] getGroupsForUser(String user) throws IOException {
  GetGroupsForUserRequestProto request = GetGroupsForUserRequestProto
      .newBuilder().setUser(user).build();
  GetGroupsForUserResponseProto resp;
  try {
    resp = rpcProxy.getGroupsForUser(NULL_CONTROLLER, request);
  } catch (ServiceException se) {
    throw ProtobufHelper.getRemoteException(se);
  }
  return resp.getGroupsList().toArray(new String[resp.getGroupsCount()]);
}