<?xml version="1.0" encoding="UTF-8"?>

<web-app version="3.0"

    xmlns="http://java.sun.com/xml/ns/javaee"

    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">

  <servlet>

    <description>This is the description of my J2EE component</description>

    <display-name>This is the display name of my J2EE component</display-name>

    <servlet-name>servletlife</servlet-name>

    <servlet-class>com.sxt.in.servletlife</servlet-class>

    <load-on-startup>1</load-on-startup><!-- 加载服务器启动流 -->

  </servlet>

  <servlet-mapping>

    <servlet-name>servletlife</servlet-name>

    <url-pattern>/life</url-pattern>

  </servlet-mapping>

</web-app>

package com.sxt.in;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

/**

 * Servlet生命周期

 * 		1从第一次被调用到服务器结束

 * 		2如果Servlet在xml中配置了load-on-startup生命周期为，  从服务器启动到服务器关闭

 * 	注意：

 * 		init方法是对servlet进行初始化的一个方法会在servlet第一次进行存储时执行

 * 		destory方法是servlet被销毁时执行，也就是服务器关闭的时候

 *

 * @author Administrator

 *

 */

public class servletlife extends HttpServlet {

	@Override//初始化方法在servlet第一次加载内容时被调用

	public void init() throws ServletException {

		System.out.println("servlet 初始化完成");

	}

	@Override//service方法是真正处理请求的方法

	protected void service(HttpServletRequest req, HttpServletResponse resp)

			throws ServletException, IOException {

		resp.getWriter().write("servlet life");//servlet只要服务器在他就在

		System.out.println("servlet life");

	}

	@Override

	public void destroy() {

		System.out.println("我被销毁了");

	}

}