一个简单的servlet

1、创建一个自己的servlet文件，继承HttpServlet

MyServlet.java

 package com.jmu.ccjoin.controller;

 import java.io.IOException;

 import javax.servlet.ServletException;
 import javax.servlet.annotation.WebServlet;
 import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;

 /**
  * Servlet implementation class MyServlet
  */
 @WebServlet("/MyServlet")
 public class MyServlet extends HttpServlet {
     private static final long serialVersionUID = 1L;

     /**
      * Default constructor.
      */
     public MyServlet() {
         // TODO Auto-generated constructor stub
     }

     /**
      * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
      */
     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
         // TODO Auto-generated method stub
         System.out.println("get");
 //        response.getWriter().append("Served at: ").append(request.getContextPath());
     }

     /**
      * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
      */
     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
         // TODO Auto-generated method stub
         doGet(request, response);
     }

 }

2、在web.xml容器加入<servlet></servlet>和<servlet-mapping></servlet-mapping>标签，用来交互式地浏览和修改数据，生成动态 Web 内容。

 <?xml version="1.0" encoding="UTF-8"?>
 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee"
     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
     version="2.5">
     <display-name>spring-mybatis</display-name>
     <context-param>
         <param-name>contextConfigLocation</param-name>
         <param-value>classpath:applicationContext.xml</param-value>
     </context-param>
     <servlet>
         <servlet-name>MyServlet</servlet-name>
         <servlet-class>com.jmu.ccjoin.controller.MyServlet</servlet-class>
     </servlet>
     <servlet-mapping>
         <servlet-name>MyServlet</servlet-name>
         <url-pattern>/MyServlet1</url-pattern>
     </servlet-mapping>

 </web-app>

注意：<servlet-name>和<url-pattern>值不能一样。

<url-pattern>*.action</url-pattern>表示以.action结尾的都执行上面的Myservlet

3、启动服务

http://localhost:9906/spring-mybatis/MyServlet1