Getting the Current ApplicationContext in Spring

叁歲伎倆 2024-03-25 11:35 49阅读 0赞

> 此文为Baeldung专题学习笔记，通过一行一行英文复制的过程逐步理解原文的意思，也担心此网站后序无法访问，或者链接搬家导致的无法跟踪的情况，故记此笔记  
> 参考：  
> [Getting the Current ApplicationContext in Spring][]

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### 为什么要获取ApplicationContext？ ###

Use this container to `access other beans and resources` in our application.

### Tow to get the current ApplicationContext in the Spring application. ###

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#### 3.1. ApplicationContext Bean ####

By `injecting it into our beans` using the `@Autowired` or `@Inject` annotation.

@Component
    public class MyBean {
        
    
        @Autowired
        private ApplicationContext applicationContext;
    
        public ApplicationContext getApplicationContext() {
        
            return applicationContext;
        }
    }

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#### 3.2. ApplicationContextAware Interface ####

By `implementing the` [ApplicationContextAware][] `interface`.

**`When an application starts, Spring automatically detects this interface and injects a reference to ApplicationContext`.**（Spring calls `setApplicationContext()` after creating ApplicationContext）

@Component
    public class ApplicationContextProvider implements ApplicationContextAware {
        
        private static ApplicationContext applicationContext;
    
        @Override
        public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        
            ApplicationContextProvider.applicationContext = applicationContext;
        }
    
        public static ApplicationContext getApplicationContext() {
        
            return applicationContext;
        }
    }

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[Getting the Current ApplicationContext in Spring]: https://www.baeldung.com/spring-get-current-applicationcontext
[ApplicationContextAware]: https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/context/ApplicationContextAware.html