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 } }