【Servlet学习】继承servlet接口简单示例

package com.sprying;import javax.servlet.Servlet;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletConfig;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;/***第一种方法开发servlet,*使用实现servlet接口方式实现,implements Servlet*/public class ServletExample implements Servlet {/***用于初始化该servlet（类似于类的构造函数）*只会被调用一次(启动服务器时，第一次被访问该servlet时,被调用)*/public void init(ServletConfig parm1) throws ServletException {// TODO: Add your code hereSystem.out.println("init servlet");}/***这个方法不是很重要，它是用来得到serv的配置文件*/public ServletConfig getServletConfig() {// TODO: Add your code herereturn null;}/*** Method service*该函数用于处理业务逻辑，程序员应当把业务逻辑代码写在这里*当用户访问该servlet时，都会调用* @param req:用于获得客户端的信息* @param res:用于向客户端返回信息**/public void service(ServletRequest req, ServletResponse res) throws ServletException, IOException {// TODO: Add your code hereSystem.out.println("service servlet");//从res中得到PrintwriterPrintWriter pw=res.getWriter();pw.println("HelloWorld");} public String getServletInfo() {// TODO: Add your code herereturn "";}/*** Method destroy*销毁servlet实例(释放内存)*1.reload该servlet//2.关闭tomcat//3.关机*/public void destroy() {// TODO: Add your code hereSystem.out.println("destroy");}}