springboot 普通类获取bean

工具类 SpringContextUtil

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.support.DefaultListableBeanFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.ConfigurableApplicationContext;

public class SpringContextUtil implements ApplicationContextAware {

    private static ApplicationContext applicationContext = null;

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

    public static Object getBean(String name){
        return applicationContext.getBean(name);
    }

    /**
     * 通过类型获取上下文中的bean
     * @param requiredType
     * @return
     */
    public static Object getBean(Class<?> requiredType){
        return applicationContext.getBean(requiredType);
    }

    /**
     *  动态注入bean
     * @param requiredType 注入类
     * @param beanName bean名称
     * @return 注入实例
     */
    public static Object registerBean(Class<?> requiredType,String beanName){

        //将applicationContext转换为ConfigurableApplicationContext
        ConfigurableApplicationContext configurableApplicationContext = (ConfigurableApplicationContext) applicationContext;

        //获取BeanFactory
        DefaultListableBeanFactory defaultListableBeanFactory = (DefaultListableBeanFactory) configurableApplicationContext.getAutowireCapableBeanFactory();

        //创建bean信息.
        BeanDefinitionBuilder beanDefinitionBuilder = BeanDefinitionBuilder.genericBeanDefinition(requiredType);

        //动态注册bean.
        defaultListableBeanFactory.registerBeanDefinition(beanName, beanDefinitionBuilder.getBeanDefinition());

        //获取动态注册的bean.
        return configurableApplicationContext.getBean(requiredType);
    }

    public static void removeBean(String beanName){
        //将applicationContext转换为ConfigurableApplicationContext
        ConfigurableApplicationContext configurableApplicationContext = (ConfigurableApplicationContext) applicationContext;
        //获取BeanFactory
        DefaultListableBeanFactory defaultListableBeanFactory = (DefaultListableBeanFactory) configurableApplicationContext.getAutowireCapableBeanFactory();
        defaultListableBeanFactory.removeBeanDefinition(beanName);
    }
}

然后在XXXApplication启动类中加入:

@Bean
    public SpringContextUtil springContextUtil(){
        return new SpringContextUtil();
    }

完整

@SpringBootApplication
public class XXXApplication {

    @Bean
    public SpringContextUtil springContextUtil(){
        return new SpringContextUtil();
    }


    public static void main(String[] args) {
        SpringApplication.run(DemoRabbitmqApplication.class, args);
    }

}

来源：https://blog.csdn.net/u013845177/article/details/102754625

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