1、实现ApplicationListener接口，并重写onApplicationEvent方法

@Component
public class RSAKeyInitListener implements ApplicationListener<ContextRefreshedEvent> {
    
    @Autowired
    BaseAppConfigDao baseAppConfigDao;

    @Override
    public void onApplicationEvent(ContextRefreshedEvent event) {
        //具体操作
        }  
}

2、创建spring的应用上下文（ApplicationContext.xml），并配置注解扫描

<context:component-scan base-package="com.xxx.xxx.facex.listener" />

3、配置web.xml

<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener><!-- 也可以与context-param标签一起使用 -->

　　 <context-param>
        <param-name>contextConfigLocation</param-name> <param-value> classpath:spring.xml </param-value> </context-param> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener>