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Il framework Spring fornisce due contenitori IOC, utilizzati per gestire, configurare e operare i Bean. Uno è BeanFactory, l'altro è il contesto dell'applicazione.
The application context interface extends BeanFactory to enhance the functionality of BeanFactory.
In the new Spring version, BeanFactory is replaced with ApplicationContext. However, the existence of BeanFactory is for backward compatibility.
Spring 2.0 and higher versions use the BeanPostProcessor extension point (the interface provides some callback methods, which we can implement to customize instantiation logic, dependency resolution logic, etc.). Therefore, if you use BeanFactory, some additional configuration is required to use certain features (such as AOP and transaction processing).
| Serial number | Key | Bean factory | Application environment |
|---|---|---|---|
| 1 piece | Implementation | XMLBeanFactory implements BeanFactory | FileSystemXmlApplicationContext, ClassPathXmlApplicationContext and AnnotationConfigWebApplicationContex implement ApplicationContext. In addition, ApplicationContext extends Beanfactory |
| 2 | Annotation | No | Yes |
| 3 | Instantiation | Bean factory instantiates beans when the getBean() method is called. | The application context applies instainte bean when the container starts. |
| 4 | Activity publishing | Bean factory does not have the ability to push events to the beans | The application context has the ability to push events to beans. |
| 5 | Loading mechanism | Lazy loading | Aggressive loading |