Spring 包扫描

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这是入口

public class BeanScannerConfigurer implements BeanFactoryPostProcessor, ApplicationListener<ContextRefreshedEvent> {    private Scanner scanner;    public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {        scanner = new Scanner((BeanDefinitionRegistry) beanFactory);    }    @Override    public void onApplicationEvent(ContextRefreshedEvent event) {        if (event.getApplicationContext().getParent() == null) {            scanner.setResourceLoader(event.getApplicationContext());            scanner.scan("com.hieip");        }    }}

这是扫描器主体

public final class Scanner extends ClassPathBeanDefinitionScanner {    public Scanner(BeanDefinitionRegistry registry) {        super(registry);    }    public void registerDefaultFilters() {        this.addIncludeFilter(new AnnotationTypeFilter(Component.class));    }    public Set<BeanDefinitionHolder> doScan(String... basePackages) {        Assert.notEmpty(basePackages, "At least one base package must be specified");        Set<BeanDefinitionHolder> beanDefinitions = new LinkedHashSet<BeanDefinitionHolder>();        for (String basePackage : basePackages) {            Set<BeanDefinition> candidates = findCandidateComponents(basePackage);            for (BeanDefinition candidate : candidates) {//                candidate.hasAttribute()                //todo 实现是否属于该注解                Class<?> clazz = null;                String beanClassName = candidate.getBeanClassName();                try {                    clazz = Class.forName(beanClassName);//反射生成对象                } catch (ClassNotFoundException e) {                    e.printStackTrace();                }                Method[] methods = clazz.getMethods();//获取方法                for (Method method: methods                     ) {                    Annotation annotation = method.getAnnotation(AuthAnnotation.class);//获取权限注解                    if(null!=annotation){//判断是否有注解                        String beanName = beanClassName.substring(beanClassName.lastIndexOf(".")+1);                        beanDefinitions.add(new BeanDefinitionHolder(candidate,beanName));//生成返回对象                    }                }            }        }        return beanDefinitions;    }    public boolean isCandidateComponent(AnnotatedBeanDefinition beanDefinition) {        return super.isCandidateComponent(beanDefinition) && beanDefinition.getMetadata()                .hasAnnotation(Service.class.getName());    }}

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