实现tomcat启动时自动运行代码

Servlet侦听器

要运用Servlet侦听器需要实现javax.servlet.ServletContextListener接口，同时实现它的contextInitialized(ServletContextEvent event)和contextDestroyed(ServletContextEvent event)两个接口函数。

listener类如下：

package test.autorun;


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


public class MyListener implements ServletContextListener {


	public void contextDestroyed(ServletContextEvent event) {
		// TODO Auto-generated method stub


	}


	public void contextInitialized(ServletContextEvent event) {

	System.out.println(“已经自动运行”);
	
		
	}


}

contextInitialized函数里的内容将被自动执行
最后在web.xml里面添加一个监听节点就行了

<listener>
   <listener-class>test.autorun.MyListener</listener-class>
  </listener>

完整web.xml如下

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>myweb</display-name>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
  <listener>
  	<listener-class>test.autorun.MyListener</listener-class>
  </listener>
</web-app>

参考链接:

http://wenku.baidu.com/link?url=oBqBDVXZHipiSmZ_LvqsRMrsTBI96yX4x9nBnsdpN9KS3m6T6NfeGVFIxIKMigEPEj7boJbX04e0iyg32yzk8ic_Zf2japZa4NWmQHepe8W