如何配置tomcat刚启动就去加载数据库信息

1、创建class，继承 javax.servlet.ServletContextListener;  

2、实现ServletContextListener;的两个类

3、在 contextInitialized  写实现的方法

4、在web.xml配置监听

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>   DataInitFromDB.java

package com.sendinfo.ebiz3.sys.m.action;

import java.util.HashMap;

import java.util.List;  

import java.util.Map;  

import java.util.UUID;  

  

import javax.servlet.ServletContextEvent;  

import javax.servlet.ServletContextListener;  

  

import org.springframework.context.ApplicationContext;  

import org.springframework.web.context.support.WebApplicationContextUtils;  

  

import com.sendinfo.ebiz3.util.AesUtil;

import com.sendinfo.ebiz3.web.m.service.MStaticService;

import com.sendinfo.ebiz3.web.model.StaticInfo;

  

public class DataInitFromDB implements ServletContextListener{  

  
public void contextDestroyed(ServletContextEvent sce) {  
}
public void contextInitialized(ServletContextEvent sce) {  

             // TODO Auto-generated method stub  

            try {  

              ApplicationContext context = WebApplicationContextUtils.getRequiredWebApplicationContext(sce.getServletContext());

              MStaticService mStaticService = (MStaticService) context.getBean( "mStaticService" );  

              StaticInfo staticInfo = new StaticInfo();

              staticInfo.setClassCode(StaticInfo.keyCode);

              List<StaticInfo> staticList = mStaticService.findStaticInfos(staticInfo);

              if(null != staticList && staticList.size() == 0){

             staticInfo = staticList.get(0);

             AesUtil.encodeRules = staticInfo.getKeystr();

              }

            } catch (Exception e) {  

                  e.printStackTrace();  

            }  

              

      }  

}  

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>web.xml配置 --

<web-app>

<listener>
<listener-class>com.sendinfo.ebiz3.sys.m.action.DataInitFromDB</listener-class>
</listener>

 </web-app>