SpringBoot 上下文获取注入的Bean（转载）

た入场券 2022-10-20 13:50 207阅读 0赞

> `前言`

用到了两篇文章

*  [https://blog.csdn.net/weixin\_30855099/article/details/97504848][https_blog.csdn.net_weixin_30855099_article_details_97504848]
 *  [https://blog.csdn.net/sgl520lxl/article/details/103694063][https_blog.csdn.net_sgl520lxl_article_details_103694063]

> `代码`

import lombok.extern.slf4j.Slf4j;
    import org.springframework.beans.BeansException;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.ApplicationContextAware;
    import org.springframework.stereotype.Component;
    
    /** * @author qilong.sun * @version v1.0 * @time 2021/5/18 10:30 * @title * @description 转载自：https://blog.csdn.net/weixin_30855099/article/details/97504848 */
    @Component
    @Slf4j
    public class ApplicationContextProvider implements ApplicationContextAware { 
        /** * 上下文对象实例 */
        private static ApplicationContext applicationContext;
    
        @Override
        public void setApplicationContext(ApplicationContext applicationContext) throws BeansException { 
            // 原来的代码
            // this.applicationContext = applicationContext;
    
            // 新代码（SpringIoc容器对象获取工具，解决反射出来的对象的属性注入为空的问题）
            // https://blog.csdn.net/sgl520lxl/article/details/103694063
            if(ApplicationContextProvider.applicationContext == null) { 
                ApplicationContextProvider.applicationContext = applicationContext;
            }
        }
    
        /** * 获取applicationContext * * @return */
        public static ApplicationContext getApplicationContext() { 
            return applicationContext;
        }
    
        /** * 通过name获取 Bean. * * @param name * @return */
        public static Object getBean(String name) { 
            return getApplicationContext().getBean(name);
        }
    
        /** * 通过class获取Bean. * * @param clazz * @param <T> * @return */
        public static <T> T getBean(Class<T> clazz) { 
            return getApplicationContext().getBean(clazz);
        }
    
        /** * 通过name,以及Clazz返回指定的Bean * * @param name * @param clazz * @param <T> * @return */
        public static <T> T getBean(String name, Class<T> clazz) { 
            return getApplicationContext().getBean(name, clazz);
        }
    }

[https_blog.csdn.net_weixin_30855099_article_details_97504848]: https://blog.csdn.net/weixin_30855099/article/details/97504848
[https_blog.csdn.net_sgl520lxl_article_details_103694063]: https://blog.csdn.net/sgl520lxl/article/details/103694063