Spring获取Application Context以及bean方法

r囧r小猫 2022-08-29 05:48 160阅读 0赞

如何在Spring中获取Application Context进而获取已加载的bean呢？

常见的方式是实现ApplicationContextAware接口，参考代码如下所示：

import org.springframework.beans.BeansException;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.ApplicationContextAware;
    import org.springframework.stereotype.Component;
    
    @Component
    public class ApplicationContextProvider implements ApplicationContextAware
    {
    	/**
    	 * 上下文对象实例
    	 */
    	private ApplicationContext applicationContext;
    
    	@Override
    	public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
    		this.applicationContext = applicationContext;
    	}
    
    	/**
    	 * 获取applicationContext
    	 * @return
    	 */
    	public ApplicationContext getApplicationContext() {
    		return applicationContext;
    	}
    
    	/**
    	 * 通过name获取 Bean.
    	 * @param name
    	 * @return
    	 */
    	public Object getBean(String name){
    		return getApplicationContext().getBean(name);
    	}
    
    	/**
    	 * 通过class获取Bean.
    	 * @param clazz
    	 * @param <T>
    	 * @return
    	 */
    	public <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 <T> T getBean(String name,Class<T> clazz){
    		return getApplicationContext().getBean(name, clazz);
    	}
    }

参考文档：

[https://blog.csdn.net/ex\_tang/article/details/82749844][https_blog.csdn.net_ex_tang_article_details_82749844]

[https_blog.csdn.net_ex_tang_article_details_82749844]: https://blog.csdn.net/ex_tang/article/details/82749844