使用session.createFilter()完成one-to-many关联关系的集合过滤

College和Student的one-to-many映射可以参考这篇文章，当访问关联实体的时候，hibernate会查询college下的所有student对象。

@Test
public void testLoad() {
	Session session = sessionFactory.openSession();

	College college = (College) session.load(College.class, 2);

	System.out.println("college name is:" + college.getName());

	System.out.println(college.getAllStudents().size());

	session.close();
}

使用session.createFilter()能够过滤关联实体的集合。A collection filter is a special type of query that can be applied to a persistent collection or array. The query string can refer to this, meaning the current collection element.

@Test
public void testSessionFilter() {
	Session sessio