Spring3.0新特性（二）
2、context.getBean可以使用泛型，不用强制转换了

@Testpublic void testSave() {ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");UserDAO userDAO = context.getBean("userDAO", UserDAO.class);//UserDAO userDAO = (UserDAO)context.getBean("userDAO");userDAO.save(new User());}