Servlet教程（一）HelloWorld

Servlet开发采用java通用的 配置 +代码 的模式

配置web.xml

<?xml version="1.0" encoding="UTF-8"?><web-app>  <servlet>    <servlet-name>HelloServlet</servlet-name>    <servlet-class>com.etc.servlet.HelloServlet</servlet-class>  </servlet>  <servlet-mapping>    <servlet-name>HelloServlet</servlet-name>    <url-pattern>/servlet/HelloServlet</url-pattern>  </servlet-mapping></web-app>  

新建HelloServlet类

package com.etc.servlet;import java.io.IOException;import java.io.PrintWriter;import java.io.Writer;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;// ### 1.继承于HttpServlet类public class HelloServlet extends HttpServlet {        // ### 2.重写父类doGet方法    public void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        // ### 3.调用response的getWriter方法，写响应        PrintWriter writer = response.getWriter();        writer.print("hello world, Servlet!");        writer.close();    }}

运行成功