思想：让实现类，初始化的时候加载需要文件
1、建立一个工具类
public class SessionUtils {
public static String url = "";
public static SessionFactory sessionFactory;
@Before
public void init(){
Configuration configuration = new Configuration();
configuration.configure(url);
sessionFactory = configuration.buildSessionFactory();
}
}
2、继承该工具类，并赋值给要初始化的文件目录
public class LazyTest extends SessionUtils{
static{
url="config/hibernate.cfg.xml";
}
