Spring 普通类中调用dao,service层，获得bean

曾经终败给现在 2022-02-26 19:42 276阅读 0赞

如下为网上大神的代码，很好用，就copy过来了

import org.springframework.beans.BeansException;
    import org.springframework.beans.factory.NoSuchBeanDefinitionException;
    import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
    import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
     
    @component
    public final class SpringUtils implements BeanFactoryPostProcessor {
     
     
    	private static ConfigurableListableBeanFactory beanFactory; // Spring应用上下文环境
     
     
    	public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
    		SpringUtils.beanFactory = beanFactory;
    	}
     
     
    	/**
    	 * 获取对象
    	 * 
    	 * @param name
    	 * @return Object 一个以所给名字注册的bean的实例
    	 * @throws org.springframework.beans.BeansException
    	 * 
    	 */
    	@SuppressWarnings("unchecked")
    	public static <T> T getBean(String name) throws BeansException {
    		return (T) beanFactory.getBean(name);
    	}
     
     
    	/**
    	 * 获取类型为requiredType的对象
    	 * 
    	 * @param clz
    	 * @return
    	 * @throws org.springframework.beans.BeansException
    	 * 
    	 */
    	public static <T> T getBean(Class<T> clz) throws BeansException {
    		@SuppressWarnings("unchecked")
    		T result = (T) beanFactory.getBean(clz);
    		return result;
    	}
     
     
    	/**
    	 * 如果BeanFactory包含一个与所给名称匹配的bean定义，则返回true
    	 * 
    	 * @param name
    	 * @return boolean
    	 */
    	public static boolean containsBean(String name) {
    		return beanFactory.containsBean(name);
    	}
     
     
    	/**
    	 * 判断以给定名字注册的bean定义是一个singleton还是一个prototype。
    	 * 如果与给定名字相应的bean定义没有被找到，将会抛出一个异常（NoSuchBeanDefinitionException）
    	 * 
    	 * @param name
    	 * @return boolean
    	 * @throws org.springframework.beans.factory.NoSuchBeanDefinitionException
    	 * 
    	 */
    	public static boolean isSingleton(String name) throws NoSuchBeanDefinitionException {
    		return beanFactory.isSingleton(name);
    	}
     
     
    	/**
    	 * @param name
    	 * @return Class 注册对象的类型
    	 * @throws org.springframework.beans.factory.NoSuchBeanDefinitionException
    	 * 
    	 */
    	public static Class<?> getType(String name) throws NoSuchBeanDefinitionException {
    		return beanFactory.getType(name);
    	}
     
     
    	/**
    	 * 如果给定的bean名字在bean定义中有别名，则返回这些别名
    	 * 
    	 * @param name
    	 * @return
    	 * @throws org.springframework.beans.factory.NoSuchBeanDefinitionException
    	 * 
    	 */
    	public static String[] getAliases(String name) throws NoSuchBeanDefinitionException {
    		return beanFactory.getAliases(name);
    	}
     
     
    }