隨著tomcat一起啟動一個線程

package test;

import   javax.servlet.*; 

public   class   MyCode   implements   ServletContextListener 
{ 
        //當Tomcat啟動時會執行contextInitialized（） 
        public   void   contextInitialized(ServletContextEvent   e) 
        { 
                new   MyThread().start(); 
        } 
        public   void   contextDestroyed(ServletContextEvent   e) 
        { 
                
        } 
        class   MyThread   extends   Thread 
        { 
                public   void   run() 
                { 
                      System.out.println("測試開始");
                } 
        } 
} 

web.xml 添加下麵的就可以了

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