public?SqlSession?getSqlSession()?throws?IOException?{
		//?STEP-1?通過配置文件獲取數據庫連接的相關信息
		Reader?reader?=?Resources.getResourceAsReader("com/imooc/config/Configuration.xml");
		//?STEP-2?通過配置信息構建一個SqlSessionFactory
		SqlSessionFactory?sqlSessionFactory?=?new?SqlSessionFactoryBuilder().build(reader);
		//?STEP-3?通過SqlSessionFactory打開數據庫會話
		SqlSession?sqlSession?=?sqlSessionFactory.openSession();
		return?sqlSession;
	}

SqlSessionFactory 里面沒有 openSession() 這個靜態方法，

需要先創建?SqlSessionFactory 類的對象才能調用??openSession()?