ApplicationListener被多次加载的问题

import org.springframework.context.ApplicationListener;
import org.springframework.context.event.ContextRefreshedEvent;
import org.springframework.stereotype.Service;


@Service
public class ParamsContextAdapter implements ApplicationListener<ContextRefreshedEvent> {

    @Override
    public void onApplicationEvent(ContextRefreshedEvent event) {
        System.out.println("test ApplicationListener");

    }
}

1. 确定ApplicationListener是对于哪种ApplicationEvent进行监听

2. 同时集成了spring和springMVC的话，上下文中会存在父、子容器，(spring的<context-param>contextConfigLocation的父容器和springMVC的<init-param>contextConfigLocation的子容器）, 在通过applicationContext发送通知的时候，事件可能会被两个容器同时发布。可以先排除是否由于配置有误造成。再

   @Override  
   public void onApplicationEvent(ContextRefreshedEvent event) {  
       if(event.getApplicationContext().getParent() == null){  
            //需要执行的逻辑代码，当spring容器初始化完成后就会执行该方法。  
       }  
   }  

源码解析：

AbstractApplicationContext：

	protected void finishRefresh() {
		// Initialize lifecycle processor for this context.
		initLifecycleProcessor();

		// Propagate refresh to lifecycle processor first.
		getLifecycleProcessor().onRefresh();

		// Publish the final event. 将上下文ApplicationContext注入到ContextRefreshedEvent中
		publishEvent(new ContextRefreshedEvent(this));
	}

	public void publishEvent(ApplicationEvent event) {
		Assert.notNull(event, "Event must not be null");
		if (logger.isTraceEnabled()) {
			logger.trace("Publishing event in " + getDisplayName() + ": " + event);
		}
		getApplicationEventMulticaster().multicastEvent(event);
		if (this.parent != null) {
			this.parent.publishEvent(event); // 如果父容器不为空，父容器也publish事件源
		}
	}