| BeanFactory | ApplicationContext |
|---|---|
| it uses lazy loading | it uses instant loading |
| It explicitly provides resource objects using the syntax | It creates and manages resource objects by itself |
| does not support internationalization | Support internationalization |
| Dependency-based annotations are not supported | Support for dependency-based annotations |
Analysis of the advantages and disadvantages of BeanFactory and ApplicationContext:
Advantages and disadvantages of BeanFactory:
- Advantages: When the application is started, it takes up very little resources, and it has advantages for applications with high resource requirements;
- Disadvantages: The running speed will be relatively slow. And there may be a null pointer exception error, and the life cycle of the Bean created through the Bean factory will be simpler.
Advantages and disadvantages of ApplicationContext:
- Advantages: All beans are loaded at startup, and the system runs fast; when the system starts, configuration problems in the system can be found.
- Disadvantage: put the time-consuming operation into the system startup, and all objects can be preloaded, but the disadvantage is that it takes up a lot of memory.
Both BeanFactory and ApplicationContext are IOC containers in the Spring framework, and there are the following differences between them:
- Different functions: BeanFactory provides the most basic IOC functions, which can instantiate, configure and manage objects, while ApplicationContext provides more functions on this basis, such as AOP, internationalization, event processing, etc.
- The initialization method is different: BeanFactory is lazy loaded, and the instance will be created when the bean is obtained, while the ApplicationContext will pre-instantiate and configure all the beans when the application starts.
- Configuration files are processed in different ways: BeanFactory is based on XML configuration files, while ApplicationContext not only supports XML configuration files, but also supports annotations, JavaConfig, etc.
- Different scopes: BeanFactory supports multiple scopes, such as singleton, prototype, request, session, etc., while ApplicationContext supports more scopes, such as global session, application, etc.
- Singleton mode: BeanFactory returns different Bean instances each time, and ApplicationContext caches all Bean instances by default, and all Beans are singletons by default.
To sum up, both BeanFactory and ApplicationContext are IOC containers in the Spring framework. The differences between them lie in functions, initialization methods, configuration file processing methods, scopes, and singleton patterns. Developers can choose the most suitable IOC container according to their own needs. If you only need the most basic IOC functions, you can choose BeanFactory; if you need more functions, such as AOP, internationalization, event processing, etc., you can choose ApplicationContext.