图片顺序可能反了，上传的时候没看清

package com.servlet.demo3;

import java.io.IOException;

import javax.servlet.Servlet;

import javax.servlet.ServletConfig;

import javax.servlet.ServletException;

import javax.servlet.ServletRequest;

import javax.servlet.ServletResponse;

public class ServletDemo2 implements Servlet{

//Servlet对象被实例化的时候init方法就会执行，而且只执行一次

@Override

public void init(ServletConfig config) throws ServletException {

  // TODO Auto-generated method stub

  System.out.println("servlet初始化了...");

}

//任何一次请求都会执行service方法，可以执行多次

@Override

public void service(ServletRequest req, ServletResponse res) throws ServletException, IOException {

  // TODO Auto-generated method stub

  System.out.println("servlet执行了...");

}

//servlet从服务器中移除或者服务器关闭的时候，会销毁servlet，销毁时执行，只执行一次

@Override

public void destroy() {

  // TODO Auto-generated method stub

  System.out.println("servlet销毁了...");

}

@Override

public ServletConfig getServletConfig() {

  // TODO Auto-generated method stub

  return null;

}

@Override

public String getServletInfo() {

  // TODO Auto-gene

rated method stub

  return null;

}

}