通常，在web项目启动时，各位可能有疑问“Java中如何让web服务器启动的时候自动运行web程序中的某些业务”，如何在web项目启动时，做一些准备工作,如1.查询数据，放入缓存；2.清理原有数据缓存；等一系列操作。

在此我为大家下提供解决方案之一，直接上代码:

import javax.servlet.ServletContext;
import org.apache.log4j.Logger;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.annotation.Autowired;
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.Service;
import org.springframework.web.context.ServletContextAware;

import com.xc.d.redis.RedisCacheUtil;
import com.xc.d.service.IConfigService;

@Service
public class StartupListener implements ApplicationContextAware, ServletContextAware, InitializingBean, ApplicationListener<ContextRefreshedEvent> {

	private static Logger log = Logger.getLogger(StartupListener.class);
	@Autowired
	private IConfigService configService;// 此处可以注入Service / Dao
	@Autowired
	private RedisCacheUtil<String, String> redisTemplate;// redis缓存工具

	@Override
	public void setApplicationContext(ApplicationContext ctx) throws BeansException {
		log.info("系统启动1 => StartupListener.setApplicationContext");
		System.out.println("系统启动1 => StartupListener.setApplicationContext");
	}

	@Override
	public void setServletContext(ServletContext context) {
		log.info("系统启动2 => StartupListener.setServletContext");
		System.out.println("系统启动2 => StartupListener.setServletContext");
	}

	@Override
	public void afterPropertiesSet() throws Exception {
		log.info("系统启动3 => StartupListener.afterPropertiesSet");
		System.out.println("系统启动3 => StartupListener.afterPropertiesSet");
	}

	@Override
	public void onApplicationEvent(ContextRefreshedEvent evt) {
		if (evt.getApplicationContext().getParent() == null) {
			return;
		}
		log.info(">>>>>>>>>>>>系统启动完成，onApplicationEvent()<<<<<<<<<<<<");
		System.out.println(">>>>>>>>>>>>系统启动完成，onApplicationEvent()<<<<<<<<<<<<");
		clearRedisDatas();// 清除redis缓存
		getAllConfig();//加载网站配置
	}

	/** 清除所有缓存 */
	public void clearRedisDatas() {
		try {
			redisTemplate.clear();
			log.info("系统启动，清除所有缓存成功");
		} catch (Exception e) {
			log.error("系统启动，清除所有缓存失败", e);
		}
	}

	/** 获取所有网站配置 */
	public void getAllConfig() {
		List<Config> configs = configService.getAllConfig();
		//后续自行发挥，可存入缓存		
	}

}