What is Spring Aware
Spring provides an Aware interface to make beans Aware of the existence of the Spring container, that is, to make beans use of resources provided by the Spring container.
Classification of Spring Aware
Several common Aware interfaces are as follows.
| Aware interface | instructions |
|---|---|
| ApplicationContextAware | Can get the service that the Application Context calls the container |
| ApplicationEventPublisherAware | Apply an event publisher that can be used to publish events |
| BeanClassLoaderAware | Can get the class loader that loads the current Bean |
| BeanFactoryAware | Can get the Bean Factory call container’s service |
| BeanNameAware | Can get the name of the current Bean |
| EnvironmentAware | Gets information about the environment properties of the current container |
| MessageSourceAware | Access to internationalized text information |
| ResourceLoaderAware | Get resource loader reads resource files |
| ServletConfigAware | ServletConfig is available |
| ServletContextAware | You can get the ServletContext |
You can see more of its inheritance diagram.
Use of Spring Aware
To get a Bean from a container, you can inherit ApplicationContextAware and give the Bean the ability to call the container’s services.
import org.springframework.beans.BeansException; import org.springframework.context.ApplicationContext; import org.springframework.context.ApplicationContextAware; public class SpringAppContext implements ApplicationContextAware { private static ApplicationContext applicationContext = null; @Override public void setApplicationContext(ApplicationContext applicationContext) throws BeansException { if (SpringAppContext.applicationContext == null) { SpringAppContext.applicationContext = applicationContext; } } public static ApplicationContext getApplicationContext() { return applicationContext; } public static Object getBean(String name) { return getApplicationContext().getBean(name); } public static <T> T getBean(Class<T> clazz) { return getApplicationContext().getBean(clazz); } public static <T> T getBean(String name, Class<T> clazz) { return getApplicationContext().getBean(name, clazz); }}Copy the codeWelcome to forward to moments, and friends together to improve themselves.
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