Spring Boot 获取Bean对象实体

Posted 2020-10-22 ^梦幻星空^

一、实现 ApplicationContextAware 接口

package com.zxguan;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;

/**
 * @author zxguan
 * @description
 * @create 2018-01-29 15:21
 */
public class SpringUtil implements ApplicationContextAware {

    private static ApplicationContext applicationContext = null;

    @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);
    }
}

二、几种方式

　　1、在Spring Boot可以扫描的包下， SpringUtil 使用注解@Component

　　2、不在Spring Boot的扫描包下方式一， 使用@Bean注解，注入Spring容器

　　3、不在Spring Boot的扫描包下方式二， 在App.class类上使用@Import(value={SpringUtil.class})

 

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