1. For Injection @Required @Autowired — wire by type @Resource — wire by name @Qulifier 2. For Declaration @Component @Service @Repository @Controller These annotations will take effect only if <context:component-scan> is used.
1. BeanPostProcessor — Do something before of after each bean is instantialized 2. BeanFactoryPostProcessors –Potentially change the bean’s configuration metadata before the container has instaniated any other beans. 3. FactoryBean — A factory that will create beans by implementing getObject()
public static boolean containsPattern(String text, String regex) { Pattern p = Pattern.compile(regex); Matcher m = p.matcher(text); return m.find(); }
1. The "singleton " scope is not "singleton per class", but "singleton per bean" 2. A bean can inherit another one, which is supposed to be declared as "abstract"
把主对象建好之后，再通过容器注入它的从属对象。 这是一种解耦： 1.主对象的构造不依赖于从属对象。 2.主对象不用考虑去哪找从属对象，容器会处理好这件事。
1. BeanFactory V.S. ApplicationContext BeanFactory only handles the managements of beans. ApplicaitonContext is build upon BeanFactory (by inheritance) but add enterprise support to it, such as AOP/Resource etc. 2. BeanDefinition will hold the metadata for beans, such as scope, lazy-initialization and so on. 3. You can use your self-defined to create your bean, …
1. Core(Ioc Container) 2. Context 3. DAO 4. ORM 5. AOP 6. JEE (JMX,JMS,JCA,Email…) 7. Web
中国的网银的用户体验普遍比较差，这可能跟银行没有专门做软件的产品经理有关。 如果说这个还可以容忍，那各种BUG就很恶心了。 某行的网银用的是C/S程序，我一次登录时，死活登录不上，老说我密码不对；后来用另一台电脑登录，就登上了。 今天遇到的这个更搞笑。这是另一家著名银行网银给我的错误提示： "对不起，操作未成功！role.user_has_not_right_status "
以 <bean id="myCache" class="org.springframework.cache.ehcache.EhCacheFactoryBean"> 为例， //正确 @Autowired private Ehcache myCache; //因为 EhCacheFactoryBean.getObjectType() == Ehcache //错误： @Autowired private Cache myCache; //会报错，虽然Cache是Ehcache的子类。具体错误为“No unique bean of type [net.sf.ehcache.Cache] is defined”
非常轻量，而且可以跟Spring集成。 据说还有人搞出了相关的Annotation，这样一来真的可以对任何对象透明地进行缓存。