Spring中实现动态注册bean

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//将applicationContext转换为ConfigurableApplicationContext
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ConfigurableApplicationContext configurableApplicationContext = (ConfigurableApplicationContext) applicationContext;
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// 获取bean工厂并转换为DefaultListableBeanFactory
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DefaultListableBeanFactory defaultListableBeanFactory = (DefaultListableBeanFactory) configurableApplicationContext.getBeanFactory();
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// 通过BeanDefinitionBuilder创建bean定义
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BeanDefinitionBuilder beanDefinitionBuilder = BeanDefinitionBuilder.genericBeanDefinition(UserService.class);
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// 设置属性userAcctDAO,此属性引用已经定义的bean:userAcctDAO
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beanDefinitionBuilder.addPropertyReference("userAcctDAO", "UserAcctDAO");
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// 注册bean,第一个参数为BeanName
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defaultListableBeanFactory.registerBeanDefinition("sdfds",beanDefinitionBuilder.getRawBeanDefinition());

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