1. JdbcTemplate is thread-safe. So a single instance of JdbcTemplate will be enough for the whole system, unless you have more than one data sources. 2. NamedParameterJdbcTemplate String sql = "select * from t where t.firstName = :firstName " You can then provider with a map — map.put("firstName", "xxx") or a java bean …
1. ‘Resource’ is actually a more powerful version of java.net.URL. What’s more, Spring suggests you use it as a generic utility class, even without Spring. 2. Built-in Implementations. a.UrlResource b.ClasspathResource c.FileSystemResource d.ServletContextResource e.InputStreamResource f.ByteArrayResource
Annotation based Management 1. Use @Transactional along with <tx:annotaion-driven/> 2. Note: Calling a @Transactional method in the same class will not take effect if you are not using AspectJ for AOP. It’s OK to use HibernateTransactionManager with JdbcTemplate here it is: 引用 This transaction manager is appropriate for applications that use a …
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()
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.
public static boolean containsPattern(String text, String regex) { Pattern p = Pattern.compile(regex); Matcher m = p.matcher(text); return m.find(); }
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, …
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. 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"
1. Core(Ioc Container) 2. Context 3. DAO 4. ORM 5. AOP 6. JEE (JMX,JMS,JCA,Email…) 7. Web