spring boot 获取ApplicationContext

https://www.jianshu.com/p/fa5db63a12e5

@Component
@Lazy(false)
public class SpringContext implements ApplicationContextAware {
    private static ApplicationContext applicationContext;
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.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);
    }
}

1. 使用：

//通过class获得bean
UserService userService= SpringContext.getBean(UserService.class);
//通过name获得bean
UserService userService= SpringContext.getBean("userService");
//通过name,以及Clazz返回指定的Bean
UserService userService= SpringContext.getBean("userService",UserService.class);