Spring中实现动态注册bean

//将applicationContext转换为ConfigurableApplicationContext
ConfigurableApplicationContext configurableApplicationContext = (ConfigurableApplicationContext) applicationContext;

// 获取bean工厂并转换为DefaultListableBeanFactory
DefaultListableBeanFactory defaultListableBeanFactory = (DefaultListableBeanFactory) configurableApplicationContext.getBeanFactory();

// 通过BeanDefinitionBuilder创建bean定义
BeanDefinitionBuilder beanDefinitionBuilder = BeanDefinitionBuilder.genericBeanDefinition(UserService.class);
// 设置属性userAcctDAO,此属性引用已经定义的bean:userAcctDAO
beanDefinitionBuilder.addPropertyReference("userAcctDAO", "UserAcctDAO");

// 注册bean,第一个参数为BeanName
defaultListableBeanFactory.registerBeanDefinition("sdfds",beanDefinitionBuilder.getRawBeanDefinition());

	// 获取applicationContext的方式因项目而异。
	private static ApplicationContext applicationContext = SpringUtil.getApplicationContext();
	// 获取bean工厂并转换为DefaultListableBeanFactory
	private static DefaultListableBeanFactory defaultListableBeanFactory = (DefaultListableBeanFactory)applicationContext.getAutowireCapableBeanFactory();
	
    public static LdapTemplate setLdapBeen(LdapSetting ldap) {
    	String bennName = "ldapTemplate"+ldap.getSite().getId();
    	BeanDefinitionBuilder beanDefinitionBuilder =BeanDefinitionBuilder.genericBeanDefinition(LdapTemplate.class);
    	beanDefinitionBuilder.addPropertyValue("contextSource",getLdapContextSource(ldap));
    	defaultListableBeanFactory.registerBeanDefinition(bennName,beanDefinitionBuilder.getBeanDefinition());
    	return (LdapTemplate) applicationContext.getBean(bennName);
    }