獲取Spring的上下文，并設(shè)置在ApplicationContextStore中

import org.springframework.context.ApplicationContext;

public class ApplicationContextStore {

    private static ApplicationContext applicationContext;

    public static void setApplicationContext(ApplicationContext applicationContext) {
        ApplicationContextStore.applicationContext = applicationContext;
    }

    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }
}

第一種：使用ApplicationContextInitializer接口逢倍，讓SpringApplication啟動時(shí)進(jìn)行回調(diào)，然后獲取ApplicationContext骤竹。

1乒验、創(chuàng)建接口

import org.springframework.context.ApplicationContextInitializer;
import org.springframework.context.ConfigurableApplicationContext;

public class UseInit implements ApplicationContextInitializer<ConfigurableApplicationContext> {

    @Override
    public void initialize(ConfigurableApplicationContext configurableApplicationContext) {
        ApplicationContextStore.setApplicationContext(configurableApplicationContext);
    }
}

2、注冊接口

@SpringBootApplication
public class SpringdemoApplication {

    public static void main(String[] args) {
        //SpringApplication.run(SpringdemoApplication.class, args);
        SpringApplication application = new SpringApplication(SpringdemoApplication.class);
        application.addInitializers(new UseInit());
        application.run(args);
    }
}

第二種：使用ApplicationListener接口电媳，當(dāng)SpringApplication啟動時(shí)候踏揣，對ApplicationContextEvent事件進(jìn)行監(jiān)聽然后回調(diào)接口，獲取ApplicationContext匾乓。

@Component
public class UseListener implements ApplicationListener<ApplicationContextEvent> {
    @Override
    public void onApplicationEvent(ApplicationContextEvent applicationContextEvent) {
        ApplicationContextStore.setApplicationContext(applicationContextEvent.getApplicationContext());
    }
}

需要注意對是捞稿，需要注冊為Spring的Bean，由SpringApplication正常啟動時(shí)自動獲取拼缝。

第三種：SpringApplication啟動時(shí)娱局，return出來的就是ApplicationContext。

@SpringBootApplication
public class SpringdemoApplication {

    public static void main(String[] args) {
        ConfigurableApplicationContext context = SpringApplication.run(SpringdemoApplication.class, args);
        ApplicationContextStore.setApplicationContext(context);
    }
}

第四種：使用SpringApplicationAware咧七，利用Spring的Bean周期衰齐，在Bean初始化的時(shí)候獲取ApplicationContext。

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

@Component
public class UseAware implements ApplicationContextAware {
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        ApplicationContextStore.setApplicationContext(applicationContext);
    }
}