<!-- 自動(dòng)掃描該包，使 SpringMVC 為包下用了@controller注解的類是控制器 --> 
<context:component-scan base-package="com.weixiao.ssmcleardb.controller" /> 
<context:component-scan base-package="com.weixiao.listener" /> 

package com.weixiao.listener;
import javax.servlet.ServletContext;
import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.ApplicationListener;
import org.springframework.context.event.ContextRefreshedEvent;
import org.springframework.stereotype.Component;
import org.springframework.web.context.ServletContextAware;
@Component("StartupListener") 
public class StartupListener implements ApplicationContextAware, ServletContextAware, InitializingBean, 
    ApplicationListener<ContextRefreshedEvent> {
	protected Logger logger = LogManager.getLogger(getClass());
	@Override 
	  public void setApplicationContext(ApplicationContext ctx) throws BeansException {
		logger.info("\r\n\r\n\r\n\r\n1 => StartupListener.setApplicationContext");
	}
	@Override 
	  public void setServletContext(ServletContext context) {
		logger.info("\r\n\r\n\r\n\r\n2 => StartupListener.setServletContext");
	}
	@Override 
	  public void afterPropertiesSet() throws Exception {
		logger.info("\r\n\r\n\r\n\r\n3 => StartupListener.afterPropertiesSet");
	}
	@Override 
	  public void onApplicationEvent(ContextRefreshedEvent event) {
		logger.info("\r\n\r\n\r\n\r\n4.1 => MyApplicationListener.onApplicationEvent");
		logger.info("\r\n\r\n\r\n\r\n4.1 => " + event.getApplicationContext().getParent());
		logger.info("\r\n\r\n\r\n\r\n4.1 => " + event.getApplicationContext().getDisplayName());
		if (event.getApplicationContext().getParent() == null) {
			logger.info("\r\n\r\n\r\n\r\n4.2 => MyApplicationListener.onApplicationEvent");
		} else{
			logger.info("\r\n\r\n\r\n\r\n4.4 => " + event.getApplicationContext().getParent().getDisplayName());
		}
		if (event.getApplicationContext().getDisplayName().equals("Root WebApplicationContext")){
			logger.info("\r\n\r\n\r\n\r\n4.3 => MyApplicationListener.onApplicationEvent");
		}
	}
}

Spring 2.5引入了更多典型化注解(stereotype annotations)： @Component、@Service和 @Controller。@Component是所有受Spring管理組件的通用形式；而@Repository、@Service和 @Controller則是@Component的細(xì)化，用來表示更具體的用例(例如，分別對(duì)應(yīng)了持久化層、服務(wù)層和表現(xiàn)層)。也就是說，你能用@Component來注解你的組件類，但如果用@Repository、@Service 或@Controller來注解它們，你的類也許能更好地被工具處理，或與切面進(jìn)行關(guān)聯(lián)。例如，這些典型化注解可以成為理想的切入點(diǎn)目標(biāo)。當(dāng)然，在Spring Framework以后的版本中， @Repository、@Service和 @Controller也許還能攜帶更多語義。如此一來，如果你正在考慮服務(wù)層中是該用@Component還是@Service，那@Service顯然是更好的選擇。同樣的，就像前面說的那樣， @Repository已經(jīng)能在持久化層中進(jìn)行異常轉(zhuǎn)換時(shí)被作為標(biāo)記使用了。”