spring-bean命名规则

    public String generateBeanName(BeanDefinition definition, 
    BeanDefinitionRegistry registry) {
        //调用生成beanName工具类
		return BeanDefinitionReaderUtils.generateBeanName(definition, registry);
	}
BeanDefinitionReaderUtils.generateBeanName具体实现

	public static String generateBeanName(BeanDefinition beanDefinition, BeanDefinitionRegistry registry)
			throws BeanDefinitionStoreException {
		return generateBeanName(beanDefinition, registry, false);
	}
	public static String generateBeanName(
			BeanDefinition definition, BeanDefinitionRegistry registry, boolean isInnerBean)
			throws BeanDefinitionStoreException {
        //获取class名称
		String generatedBeanName = definition.getBeanClassName();
        //如果为空,从父类definition查找，如果查找到用父类+$child作为class名称
        //父类definition查找不到，判断FactoryBeanName是否为空,不为空用FactoryBeanName+$created
		if (generatedBeanName == null) {
			if (definition.getParentName() != null) {
				generatedBeanName = definition.getParentName() + "$child";
			}
			else if (definition.getFactoryBeanName() != null) {
				generatedBeanName = definition.getFactoryBeanName() + "$created";
			}
		}
        //判断class名称是否为空,为空报错
		if (!StringUtils.hasText(generatedBeanName)) {
			throw new BeanDefinitionStoreException("Unnamed bean definition specifies neither " +
					"'class' nor 'parent' nor 'factory-bean' - can't generate bean name");
		}
		String id = generatedBeanName;
        //判断否是内部类
		if (isInnerBean) {
			// Inner bean: generate identity hashcode suffix.
			id = generatedBeanName + GENERATED_BEAN_NAME_SEPARATOR + ObjectUtils.getIdentityHexString(definition);
		}
		else {
			// Top-level bean: use plain class name with unique suffix if necessary.
			return uniqueBeanName(generatedBeanName, registry);
		}
		return id;
	}
    //生成beanName
	public static String uniqueBeanName(String beanName, BeanDefinitionRegistry registry) {
		String id = beanName;
		int counter = -1;
		//判断bean id是否存在，如果存在一直循环至到不存在
		while (counter == -1 || registry.containsBeanDefinition(id)) {
			counter++;
			id = beanName + GENERATED_BEAN_NAME_SEPARATOR + counter;
		}
		return id;
	} 

	public String generateBeanName(BeanDefinition definition, BeanDefinitionRegistry registry) {
        
		if (definition instanceof AnnotatedBeanDefinition) {
            //通过注解查找属性Value的值
			String beanName = determineBeanNameFromAnnotation((AnnotatedBeanDefinition) definition);
			if (StringUtils.hasText(beanName)) {
				// Explicit bean name found.
				return beanName;
			}
		}
		// Fallback: generate a unique default bean name.
        //用class类名作为beanName
		return buildDefaultBeanName(definition, registry);
	}

ConfigurationClassBeanDefinitionReader#loadBeanDefinitionsForBeanMethod方法
		//关键代码
		// Consider name and any aliases
		List<String> names = new ArrayList<>(Arrays.asList(bean.getStringArray("name")));
		String beanName = (!names.isEmpty() ? names.remove(0) : methodName);