一些反射常用的工具类

拷贝属性：

1.org.apache.commons.beanutils.PropertyUtils.setProperty(Object bean, String name, Object value)
 throws IllegalAccessException, InvocationTargetException, NoSuchMethodException
2.BeanUtils.setProperty(entity, fieldName, ovalue);

ClassMetadata org.hibernate.SessionFactory.getClassMetadata(Class arg0) throws HibernateException
Serializable org.hibernate.metadata.ClassMetadata.getIdentifier(Object arg0, EntityMode arg1) 
Object org.hibernate.Session.load(Class arg0, Serializable arg1) throws HibernateException
如：
Integer i = 3;
Object value = (Object) i;
Class vClass = value.getClass();
ClassMetadata cm = sessionFactory.getClassMetadata(vClass);
Serializable vid = cm.getIdentifier(value, EntityMode.POJO);

hibernate加载实体
Object org.hibernate.Session.load(Class arg0, Serializable arg1) throws HibernateException
如：
Object po = getSession().load(bean.getClass(),
     cm.getIdentifier(bean, EntityMode.POJO));