其实 BeanFactory
已经提供了完整的功能,但是使用起来比较麻烦。现在用 ApplicationContext
做一个接口封装。
1. ApplicationContext
接口
public interface ApplicationContext extends BeanFactory {
}
2. AbstractApplicationContext
抽象类
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. ClassPathXmlApplicationContext
xml 的 ApplicationContext,refesh()
用来初始化 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. 测试代码,比之前使用更佳简便,封装了实现细节。
@Test
public void test() throws Exception {
ApplicationContext applicationContext = new ClassPathXmlApplicationContext("tinyioc.xml");
HelloWorldService helloWorldService = (HelloWorldService) applicationContext.getBean("helloWorldService");
helloWorldService.helloWorld();
}
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