public ChinaStationImporter() {
String persistenceUnitName = "persistenceUnit";
EntityManagerFactory factory = Persistence.createEntityManagerFactory(persistenceUnitName);
this.entityManager = factory.createEntityManager();
ChinaStationDaoImpl chinaStationDaoImpl = new ChinaStationDaoImpl();
chinaStationDaoImpl.setEntityManager(this.entityManager);
this.chinaStationDao = chinaStationDaoImpl;
}