欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页

手动注入bean

程序员文章站 2022-06-04 10:45:39
...

一、工具类


public class SpringCtxUtil implements ApplicationContextAware  {

	private static ApplicationContext applicationContext;
	private static DefaultListableBeanFactory defaultListableBeanFactory;


	@Override
	public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
		AnycloudApplication.applicationContext = applicationContext;
		defaultListableBeanFactory = (DefaultListableBeanFactory)applicationContext.getAutowireCapableBeanFactory();
	}

	public static <T> T getBean(Class<T> clazz) {
		BeanDefinitionBuilder beanDefinitionBuilder = BeanDefinitionBuilder.genericBeanDefinition(clazz);
		String className = clazz.getName();
		defaultListableBeanFactory.registerBeanDefinition(className, beanDefinitionBuilder.getBeanDefinition());
		return (T) applicationContext.getBean(className);
	}

	public static void destroy(String className){
		defaultListableBeanFactory.removeBeanDefinition(className);
		System.out.println("destroy " + className);
	}
}

二、使用工具类注入类

UserService userService= SpringCtxUtil.getBean(UserService.class);

三、注意

 在我们需要调用的类前加上注解@Primary

@Primary
public Class UserService {

}

如果我们在需要注入的类中使用了@Transactional注解,一般会导致注入失败,请参考下面的博文

 https://blog.csdn.net/weixin_36524613/article/details/85258442

 

相关标签: 手动注入