start-on-load

<servlet> 
    //配置映射 
    <servlet-name>simple</servlet-name> 
    <servlet-class>cn.mldn.lxh.servlet.SimpleServlet</servlet-class> 
    //程序运行优先级 
    <load-on-startup>1</load-on-startup> 
    //配置初始化参数 
    <param-name>DBDRIVER</param-name> 
    <param-value>oracle.jdbc.driver.OracleDriver</param-value> 
</servlet> 
<servlet-mapping> 
    <servlet-name>simple</servlet-name> 
    <url-pattern>/demo</url-pattern> 
</servlet-mapping>