其實(shí)BeanFactory已經(jīng)提供了完整的功能尘分，但是使用起來(lái)比較麻煩∪褂蹋現(xiàn)在用ApplicationContext做一個(gè)借口封裝员凝。

1. ApplicationContext接口

    public interface ApplicationContext extends BeanFactory {
    }

2. AbstractApplicationContext抽象類

    public abstract class AbstractApplicationContext implements ApplicationContext {
        protected AbstractBeanFactory beanFactory;
    
        public AbstractApplicationContext(AbstractBeanFactory beanFactory) {
            this.beanFactory = beanFactory;
        }
    
        public void refresh() throws Exception{
        }
    
        @Override
        public Object getBean(String name) throws Exception {
            return beanFactory.getBean(name);
        }
    }

3. ClassPathXmlApplicationContextxml的ApplicationContext摇锋，refesh()用來(lái)初始化Bean

    public class ClassPathXmlApplicationContext extends AbstractApplicationContext {
    
        private String configLocation;
    
        public ClassPathXmlApplicationContext(String configLocation) throws Exception {
            this(configLocation, new AutowireCapableBeanFactory());
        }
    
        public ClassPathXmlApplicationContext(String configLocation, AbstractBeanFactory beanFactory) throws Exception {
            super(beanFactory);
            this.configLocation = configLocation;
            refresh();
        }
    
        @Override
        public void refresh() throws Exception {
            XmlBeanDefinitionReader xmlBeanDefinitionReader = new XmlBeanDefinitionReader(new ResourceLoader());
            xmlBeanDefinitionReader.loadBeanDefinitions(configLocation);
            for (Map.Entry<String, BeanDefinition> beanDefinitionEntry : xmlBeanDefinitionReader.getRegistry().entrySet()) {
                beanFactory.registerBeanDefinition(beanDefinitionEntry.getKey(), beanDefinitionEntry.getValue());
            }
        }
    
    }

4. 測(cè)試代碼苇侵，比之前使用更佳簡(jiǎn)便油狂，封裝了實(shí)現(xiàn)細(xì)節(jié)历恐。

    @Test
    public void test() throws Exception {
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("tinyioc.xml");
        HelloWorldService helloWorldService = (HelloWorldService) applicationContext.getBean("helloWorldService");
        helloWorldService.helloWorld();
    }