spring中实现容器加载完成后再执行自己的方法

@Service
public class StartListener implements ApplicationListener<ContextRefreshedEvent> {
    public static final Map<Integer, TableMapper> mappers = new HashMap<>();
    @Resource
    A_Mapper a_mapper;
    @Override
    public void onApplicationEvent(ContextRefreshedEvent event)
    {
        if(event.getApplicationContext().getParent() == null)//root application context 没有parent，他就是老大.
        {
            //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。
            System.out.println("\n\n\n\n\n______________\n\n\n加载了\n\n_________\n\n");
        }
        //或者下面这种方式
        if(event.getApplicationContext().getDisplayName().equals("Root WebApplicationContext"))
        {
            System.out.println("\n\n\n_________\n\n加载一次的 \n\n ________\n\n\n\n");
        }
        mappers.put(1,a_mapper);
    }
}

package com.irisian.picturelabel.listener;

import com.irisian.picturelabel.service.PictureService;
import com.irisian.picturelabel.service.TaskService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

/**
 * Author:吴满心
 * Date:2018/5/18
 * Function:负责在spring容器加载完成之后进行图片和任务数据表的更新
 */
@Component
public class SpringFinishedListener implements InitializingBean {
    private static final Logger logger = LoggerFactory.getLogger(SpringFinishedListener.class);

    @Autowired
    private PictureService pictureService;

    @Autowired
    private TaskService taskService;

    @Override
    public void afterPropertiesSet() throws Exception {
        new Thread(() -> {
            while (true) {
                logger.info("开始执行图片和任务的更新操作!");
                try {
                    pictureService.updatePictureStatus();
                    //更新任务的完成状态信息
                    taskService.updateFinishStatus();
                } catch (Exception e) {
                    e.printStackTrace();
                    logger.error(e.getMessage());
                }
                try {
                    Thread.sleep(1800000);      //30分钟执行一次进行数据更新
                } catch (InterruptedException e) {
                    e.printStackTrace();
                    logger.error(e.getMessage());
                }
            }
        }).start();


    }
}

package com.irisian.picturelabel.servlet;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;

/**
 * Author:吴满心
 * Date:2018/5/18
 * Function:
 */
@WebServlet(name = "backServlet", urlPatterns = {"/backServlet"})
public class BackServlet extends HttpServlet {
    private static final Logger logger= LoggerFactory.getLogger(BackServlet.class);

    @Override
    public void init() throws ServletException {
        new Thread(()->{
            while(true){
                logger.info("我5秒钟执行一次");
                try {
                    Thread.sleep(5000);
                } catch (InterruptedException e) {
                    logger.error(e.getMessage());
                }
            }
        }).start();
    }


    @Override
    public void destroy() {
        logger.info("服务器关闭了");
    }
}

package com.irisian.picturelabel.configuration;
import com.irisian.picturelabel.exception.MyExceptionResolver;
import com.irisian.picturelabel.servlet.BackServlet;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.HandlerExceptionResolver;

/**
 * Author:吴满心
 * Date:2018/5/15
 * Function:
 */
@Configuration
public class SpringConfiguration {
    @Bean
    public HandlerExceptionResolver getHandlerExceptionResolver() {
        return new MyExceptionResolver();
    }

    /**
     * 配置一个后台运行的servlet
     * @return
     */
    @Bean
    public ServletRegistrationBean servletRegistrationBean() {
        ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(new BackServlet(), "/backServlet");
        servletRegistrationBean.setLoadOnStartup(1);        //数字越小，启动优先级越高，但是必须大于0
        return servletRegistrationBean;
    }

}