Servlet（生命周期）

<?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><!-- 載入伺服器啟動流 -->
  </servlet>

  <servlet-mapping>
    <servlet-name>servletlife</servlet-name>
    <url-pattern>/life</url-pattern>
  </servlet-mapping>

</web-app>

　　上面是web.xml

　　下麵是servletlife   java類

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從第一次被調用到伺服器結束
 * 		2如果Servlet在xml中配置了load-on-startup生命周期為，  從伺服器啟動到伺服器關閉
 * 	註意：
 * 		init方法是對servlet進行初始化的一個方法會在servlet第一次進行存儲時執行
 * 		destory方法是servlet被銷毀時執行，也就是伺服器關閉的時候
 * 
 * @author Administrator
 *
 */

public class servletlife extends HttpServlet {
	@Override//初始化方法在servlet第一次載入內容時被調用
	public void init() throws ServletException {
		System.out.println("servlet 初始化完成");
	}
	@Override//service方法是真正處理請求的方法
	protected void service(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		resp.getWriter().write("servlet life");//servlet只要伺服器在他就在
		System.out.println("servlet life");
	}
	
	@Override
	public void destroy() {
		System.out.println("我被銷毀了");
	}

}