随着tomcat一起启动一个线程

package test;

import   javax.servlet.*;

public   class   MyCode   implements   ServletContextListener
{
//当Tomcat启动时会执行contextInitialized（）
public   void   contextInitialized(ServletContextEvent   e)
{
new   MyThread().start();
}
public   void   contextDestroyed(ServletContextEvent   e)
{

}
class   MyThread   extends   Thread
{
public   void   run()
{
System.out.println("测试开始");
}
}
}

<listener>
　　<listnenr-class> test.MyCode </listener-class>
</listener>