在Spring应用中，获取ApplicationContext的常用方法有哪些？

@Component
public class MyBean implements ApplicationContextAware {
    private static ApplicationContext context;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        context = applicationContext;
    }

    public static void doSomething() {
        MyService myService = context.getBean(MyService.class);
        myService.performAction();
    }
}

@Component
public class MyBean {
    private final ApplicationContext context;

    @Autowired
    public MyBean(ApplicationContext context) {
        this.context = context;
    }

    public void doSomething() {
        MyService myService = context.getBean(MyService.class);
        myService.performAction();
    }
}

@SpringBootApplication
public class MyApplication {

    public static void main(String[] args) {
        ApplicationContext context = SpringApplication.run(MyApplication.class, args);
        MyService myService = context.getBean(MyService.class);
        myService.performAction();
    }
}

@Configuration
@ComponentScan("com.example")
public class AppConfig {
    // 配置相关Bean
}

public class MainApp {
    public static void main(String[] args) {
        ApplicationContext context = new AnnotationConfigApplicationContext(AppConfig.class);
        MyService myService = context.getBean(MyService.class);
        myService.performAction();
    }
}

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="myService" class="com.example.MyService"/>
</beans>

public class MainApp {
    public static void main(String[] args) {
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        MyService myService = context.getBean(MyService.class);
        myService.performAction();
    }
}