springboot项目获取spring容器中的bean

工具类

创建工具类如下

@Component
public class SpringUtil implements ApplicationContextAware {
    
    

    private static ApplicationContext applicationContext;

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

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

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

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

使用方式

public void method() {
    
    

    UserDao userDao = SpringUtil.getBean(UserDao.class);
    ...
}