springboot获取Spring容器中的bean-优快云博客

本文链接：https://blog.youkuaiyun.com/weixin_42899433/article/details/109440287

本文介绍了如何在SpringBoot应用中通过工具类获取Spring容器中的Bean，包括编写Spring的工具类和定义Bean的过程。

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springboot获取Spring容器中的bean

spring的工具类编写

@Component
public class SpringUtil implements ApplicationContextAware {

    private static ApplicationContext applicationContext;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        if(SpringUtil.applicationContext == null) {
            SpringUtil.applicationContext = applicationContext;
        }
    }

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

    //通过name获取 Bean.
    public static Object getBean(String name){
        return getApplicationContext().getBean(name);
    }

    //通过class获取Bean.
    public static <T> T getBean(Class<T> clazz){
        return getApplicationContext().getBean(clazz);
    }

    //通过name,以及Clazz返回指定的Bean
    public static <T> T getBean(String name,Class<T> clazz){
        return getApplicationContext().getBean(name, clazz);
    }

}

编写一个bean

@SpringBootApplication
public class MyzoonkeeperApplication {
    @Bean(name = "xxxx")
    public User getUser() {
        User user = new User(1,"tom");
        return user;
    }

    public static void main(String[] args) {

        SpringApplication.run(MyzoonkeeperApplication.class, args);

        System.out.println("===========");
        User user = (User)SpringUtil.getBean("xxxx");
        User user1 = SpringUtil.getBean("xxxx",User.class);
        System.out.println(user);
        System.out.println(user==user1);

    }

}