springboot中有用的几个有用aware以及bean操作和数据源操作

Posted 2021-01-14 lzfhope

本文参考了:

https://blog.csdn.net/derrantcm/article/details/76652951

https://blog.csdn.net/derrantcm/article/details/73456550

通过以上可以获得springboot的许多知识。

本文只是列出本人常用的两个aware.

闲话少叙，直接上代码

BeanFactoryAware  帮助获取各种bean

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;
import org.springframework.stereotype.Component;

@Component
public class BeanHelper implements BeanFactoryAware {
    
    private static BeanFactory beanFactory;

    @Override
    public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
        this.beanFactory = beanFactory;
    }

    public static <T>T getBean(String id,Class<T> type){        
        return  beanFactory.getBean(id,type);                
    }
    
    
    public static <T>T getBean(Class<T> type){        
        return  beanFactory.getBean(type);        
        
    }
    
    public static <T>T getBean(String beanName){        
        return  (T) beanFactory.getBean(beanName);        
    }
    
}

 

ApplicationContextAware 帮助获取上线文的信息，也可以操作bean

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

@Component
public class DsControl implements ApplicationContextAware {
    
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
         //dataSource在springboot中是一个关键字
         Object ds=applicationContext.getBean("dataSource") ;
         System.out.println("当前的连接池是:"+ds.getClass().getName());
         System.out.println("-----gooooo");
        
        
        String[] beanDefinitionNames = applicationContext.getBeanDefinitionNames();
        for (String beanDefinitionName : beanDefinitionNames) {
            System.out.println(beanDefinitionName);
        }
    }

}