绠€鍗曡В鏋怱pring鏍稿績IOC瀹瑰櫒鍘熺悊

Posted 2020-12-24

鏍囩锛?a href='http://www.mamicode.com/so/1/actor' title='actor'>actor   cat   ons   exce   classpath   map   ebe   context   鏍稿績   

灏嗗ぇ浣撴祦绋嬭В鏋愪簡涓€杈癸紝鍏蜂綋鍙互鐪嬫簮浠ｇ爜涓€涓柟娉曚竴涓柟娉曠殑璺熶笅

XmlBeanFactory鐨勫姛鑳芥槸寤虹珛鍦?code>DefaultListableBeanFactory杩欎釜鍩烘湰瀹瑰櫒鐨勫熀纭€涓婄殑锛屽苟鍦ㄨ繖涓熀鏈鍣ㄧ殑鍩虹涓婂疄琛屼簡鍏朵粬璇稿XML璇诲彇鐨勯檮鍔犲姛鑳姐€?/p>

DefaultListableBeanFactory鏄?code>BeanFactory鐨勪竴涓粯璁ゅ疄鐜扮被銆?/p>

public class XmlBeanFactory extends DefaultListableBeanFactory {
    private final XmlBeanDefinitionReader reader = new XmlBeanDefinitionReader(this);
    
    /**
     * Resource鏄疭pring涓涓庡閮ㄨ祫婧愮殑鎶借薄锛屾渶甯歌鐨勬槸瀵规枃浠剁殑鎶借薄锛岀壒鍒槸XML鏂囦欢銆?     * 鑰屼笖Resource閲岄潰閫氬父淇濆瓨浜哠pring浣跨敤鑰呯殑Bean瀹氫箟
     * 姣斿applicationContext.xml鍦ㄨ鍔犺浇鏃讹紝灏变細琚娊璞′负Resource鏉ュ鐞嗐€?     */
    public XmlBeanFactory(Resource resource) throws BeansException {
        this(resource, null);
    }
    
    public XmlBeanFactory(Resource resource, BeanFactory parentBeanFactory) throws BeansException {
        super(parentBeanFactory);
        this.reader.loadBeanDefinitions(resource);
    }
}

绠€鍗曠ず渚嬶細

public class MySimpleBeanFactory {
    public static void main(String[] args) {
        ClassPathResource resource = new ClassPathResource("META-INF/beans.xml");
        BeanFactory beanFactory = new XmlBeanFactory(resource);
        User user = beanFactory.getBean("user1", User.class);
        System.out.println(user.getName()+" : "+user.getAge());
    }
}

鍒涘缓瀹瑰櫒鐨勬楠わ細

1. 鍒涘缓bean閰嶇疆鏂囦欢鐨勬娊璞?code>Resource
2. 鍒涘缓BeanFactory锛屼緥濡傦細XmlBeanFactory
3. 瑙ｆ瀽Bean锛屽垱寤轰竴涓?code>BeanDefinition璇诲彇鍣紝渚嬪锛?code>XmlBeanDefinitionReader->DefaultBeanDefinitionDocumentReader->BeanDefinitionParserDelegate
4. 寰楀埌BeanDefinition鍚庢敞鍐屽埌DefaultListableBeanFactory涓細

// 鏈€鍚嶣eanDefinition灏辨槸鏀惧埌杩欎釜map閲岀殑
Map<String, BeanDefinition> beanDefinitionMap = new ConcurrentHashMap<String, BeanDefinition>(256);

浠ュ悗浼氭參鎱㈠畬鍠勩€?/p>

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