随TOMCAT启动 启动一个线程

建立一个类,
实现ServletContextListener接口
在web.xml里加上监听

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

public class socketMain implements ServletContextListener {
    @Override
    public void contextInitialized(ServletContextEvent sce) {
        new   MyThread().start();
    }

    @Override
    public void contextDestroyed(ServletContextEvent sce) {

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

web.xml加上

<listener>
    <listener-class>com.calanger.app.admin.websocket.socketMain</listener-class>
  </listener>